2025

QUICK INDEX
NEW & REVISED KITS FOR 2025
(as of October, 2024 – scan the QR code below for the most up-to-date information on our website)

Audi 2.5L TFSI inline 5 (DAZA/DNWA) Chrysler 5.7L/6.1L/6.4L Hemi

Custom Age 625+ Head Stud Kit (p 71) . . . . . . 404-4708 ARP2000 Main Stud Kit (p 80) . . . . . . . . . . . . . . 244-5401
BMW 1.6L, 2.0L inline 4 (B48) Dart, LS Next Iron Block
8740 Main Stud Kit (p 79). . . . . . . . . . . . . . . . . . 201-5404 15-bolt, 8740 Head Stud Kit (p 61) . . . . . . . . . . 234-4349
8740 Head Stud Kit (p 59). . . . . . . . . . . . . . . . . . 201-4704 23-bolt, 8740 Head Stud Kit (p 61) . . . . . . . . . . 234-4350
Custom Age 625+ Head Stud Kit (p 59) . . . . . . 401-4704 GMC 6.6L Duramax L5P
BMW 2.8L (M52), 3.0L (M54) inline 6 8740 Rod Bolt Kit (p 48) . . . . . . . . . . . . . . . . . . . 230-6302
8740 Rod Bolt Kit (p 47) . . . . . . . . . . . . . . . . . . . 201-6303 Ring Compressor
ARP2000 Rod Bolt Kit (p 47). . . . . . . . . . . . . . . . 201-6306 86.25mm (p 175). . . . . . . . . . . . . . . . . . . . . . . . . 901-8625
BMW 3.0L inline 6 (S58) Rod Bolts
8740 Head Stud Kit (p 59). . . . . . . . . . . . . . . . . . 201-4705 Aftermarket Connecting Rod, Metric (p 44). . . . . . . 37 kits
BMW 3.9L, 4.4L V8 (S63) Suzuki M16A
ARP2000 Head Stud Kit (p 59) . . . . . . . . . . . . . . 201-4702 8740 Rod Bolt Kit (p 52) . . . . . . . . . . . . . . . . . . . 171-6001
Custom Age 625+ Head Stud Kit (p 59) . . . . . . 201-4703 Toyota 1.6L, 2.0L inline 4 (B48)
Chevrolet Fuel Pump Pushrods for roller cams 8740 Main Stud Kit (p 82). . . . . . . . . . . . . . . . . . 203-5410
Small Block (p 111). . . . . . . . . . . . . . . . . . . . . . . . 134-8702 8740 Head Stud Kit (p 70). . . . . . . . . . . . . . . . . . 203-4707
Big Block (p 111). . . . . . . . . . . . . . . . . . . . . . . . . . 135-8702 Custom Age 625+ Head Stud Kit (p 70) . . . . . . 403-4707
Chevrolet Oil Pump Drive
Big Block, 0.400 raised camshaft (p 110) . . . . . 135-7903

Accessory Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Bulk Fastener Bins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Accessory Cam Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Cam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Air Cleaner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Cam Tower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Alternator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98, 111, 135 Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102, 135
Apparel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 Carburetor Float Bowl. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Auto Transmission Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Carrier Fasteners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Balancer Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Circle Track Racing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Bellhousing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Speed Studs & Nuts . . . . . . . . . . . . . . . . . . . . . . 133 & 134
Blower (break-away). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Intake Manifold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Blower Pulley. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Carburetor, drilled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Bolts, SAE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Header, drilled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
10/24 & 10/32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Front Mandrel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
1/4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Clutch Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
1/4-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Coil Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
5/16-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Cylinder Head Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5/16-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Cylinder Head Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
3/8-16 Reduced & Standard wrenching. . . . . . . . . . . . 150 Damper, Harmonic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
3/8-24 Reduced & Standard wrenching. . . . . . . . . . . . 151 Diesel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7/16-14 Standard wrenching. . . . . . . . . . . . . . . . . . . . . 152 Cylinder Head Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
7/16-20 Standard wrenching. . . . . . . . . . . . . . . . . . . . . 153 Cylinder Head Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
1/2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 Rod Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
1/2-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Main Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Bolts, Metric Harmonic Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
M6 x 1.0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 Exhaust Fastener. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
M8 x 1.25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 Valve Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
M10 x 1.25, M10 x 1.50. . . . . . . . . . . . . . . . . . . . . . . . . 159 Flywheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
M12 x 1.50, M12 x 1.75. . . . . . . . . . . . . . . . . . . . . . . . . 160 Flexplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Brake Hat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Rocker Pedastal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

2
 QUICK INDEX
Ring Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Rocker Arm Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Distributor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Rocker Arm Adjusters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Driveline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Rocker Pedastal Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 89, 142
Drive Pins, Sprint Car . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Rod Bolts
Drive Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Aftermarket Rods - SAE. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Engine Accessory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Aftermarket Rods - Metric. . . . . . . . . . . . . . . . . . . . . . . . . 44
Engine & Accessory Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 OEM Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Engine Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 Length Monitoring Chart. . . . . . . . . . . . . . . . . . . . . . . . . 54
Engine Case Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Stretch & Torque Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Engine Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Rod Bolt Stretch Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Exhaust Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Rod Bolt Extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Fastener Assembly Lube, Ultra-Torque . . . . . . . . . . . . . . . . . 171 Rod Vise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Flywheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Spark Plug Indexer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Flexplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Seal Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Sprint Car Drive Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Fuel Pump Pushrod. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Square Drive Damper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Front Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Stainless Fasteners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Front Mandrel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Starter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Harmonic Damper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 Thermostat Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Head Studs & Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Thread Cleaning Chasers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Header Collector Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Thread Sealer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 Tools, Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Insert Washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Torque Converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Installation Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Torque Specs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Intake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Transmission Pan & Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Intake Manifold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Valve Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Lower Pulley Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 Washers
Main Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 SAE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Main Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Metric. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Manual Transmission Case. . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Insert Washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Motor Mount. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Water Pump & Water Pump Pulley. . . . . . . . . . . . . . . . . . 98, 99
Nuts Wheel Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128, 133
SAE 12-point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 Weld Bungs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Metric 12-point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 Ultra-Torque Fastener Assembly Lube. . . . . . . . . . . . . . . . . . 171
SAE Hex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
SAE & Nyloc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Serrated Flange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Self-Locking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 Looking for the latest ARP kits,
Oil Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 revisions and technical updates?
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Oil Pump Driveshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Our website and online catalog are updated with the
Oil Pump Primer Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 latest new kits.Find the most up-to-date information
Perma-Loc Adjusters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 by scanning the code below
Porsche Engine Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Porsche Transmission Mount. . . . . . . . . . . . . . . . . . . . . . . . . 125
Powersports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Rod Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Cylinder Head Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Cylinder Head Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Main Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Main Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Pressure Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Rear End Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Ring Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 ARP-bolts.com
Ring Squaring Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Ring Gear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

3
FASTENERS BY GROUP
Rod Bolts 42 Engine Accessory 114
Aftermarket Rods. . . . . . . . . 42 OEM Replacement . . . . . . . 44 Kits Include:
Motor Mount, Alternator Bracket, Water Pump, Front Cover,
Fuel Pump, Intake Manifold, Valve Cover, Coil Bracket, Exhaust
Header, Thermostat, Distributor Bracket, Oil Pan
Head Studs & Bolts 58
Cylinder Head Studs. . . . . . 58 Cylinder Head Bolts . . . . . . 72
Driveline 116
Flywheel. . . . . . . . . . . . . . . 116 Manual Transmission
Main Studs & Bolts 78 Flexplate. . . . . . . . . . . . . . . 119 Case . . . . . . . . . . . . . . . . . . 125
Main Studs. . . . . . . . . . . . . . 78 Main Bolts . . . . . . . . . . . . . . 83 Torque Converter. . . . . . . . 120 Porsche Transmission Mount.
Engine Case Kits . . . . . . . . . 82 Ring Gear. . . . . . . . . . . . . . 121 125
Bellhousing. . . . . . . . . . . . 122 Auto Transmission Pan . . . 125
Carrier Fasteners. . . . . . . . 123 Lower Pulley Bolts. . . . . . . 126
Rear End Cover . . . . . . . . . 123 Drive Plate. . . . . . . . . . . . . 127
Cylinder Head 86 Clutch Cover. . . . . . . . . . . . 124 Sprint Car Drive Pins. . . . . 127
Pressure Plate . . . . . . . . . . 124 Brake Hat. . . . . . . . . . . . . . 127
Rocker Arm Studs . . . . . . . . 86 Accessory Studs. . . . . . . . . . 92
Wheel Studs. . . . . . . . . . . . 128
Rocker Arm Adjusters . . . . . 88 Header Collector Bolts . . . . 93
Rocker Pedastal Studs. . . . . 89 Header . . . . . . . . . . . . . . . . . 94
Valve Cover. . . . . . . . . . . . . . 90
Circle Track 133
Speed Studs. . . . . . . . . . . . 133 Alternator. . . . . . . . . . . . . . 135
Engine Block 96 Speed Nuts. . . . . . . . . . . . . 134 Header, drilled. . . . . . . . . . 136
Intake Manifold. . . . . . . . . 134 Front Mandrel. . . . . . . . . . 136
Oil Pan . . . . . . . . . . . . . . . . . 96 Motor Mount. . . . . . . . . . . 100
Carburetor, drilled. . . . . . . 135
Oil Pump . . . . . . . . . . . . . . . 97 Starter. . . . . . . . . . . . . . . . . 100
Front Cover. . . . . . . . . . . . . . 98 Fuel Pump . . . . . . . . . . . . . 101
Water Pump. . . . . . . . . . . . . 98 Seal Plate. . . . . . . . . . . . . . 101
Alternator. . . . . . . . . . . . . . . 98 Accessory Cam Drive. . . . . 101 Diesel 137
Water Pump Pulley. . . . . . . 99
Cylinder Head Studs. . . . . 138 Valve Cover. . . . . . . . . . . . . 141
Cylinder Head Bolts . . . . . 139 Flywheel. . . . . . . . . . . . . . . 142
Rod Bolts . . . . . . . . . . . . . . 139 Flexplate. . . . . . . . . . . . . . . 142
Intake 102 Main Studs. . . . . . . . . . . . . 140 Rocker Pedastal. . . . . . . . . 142
Harmonic Damper. . . . . . 140 Ring Compressors. . . . . . . 142
Carburetor . . . . . . . . . . . . . 102 Coil Bracket . . . . . . . . . . . . 106
Exhaust. . . . . . . . . . . . . . . . 141
Air Cleaner. . . . . . . . . . . . . 103 Thermostat Housing. . . . . 106
Distributor . . . . . . . . . . . . . 103 Blower (break-away). . . . . 107
Intake Manifold. . . . . . . . . 104 Blower Pulley. . . . . . . . . . . 107
Carburetor Float Bowl. . . . 105 Powersports 143
Rod Bolts . . . . . . . . . . . . . . 143
Cylinder Head Studs. . . . . 143
Engine Components 108 Cylinder Head Studs. . . . . 143
Main Studs. . . . . . . . . . . . . 143
Harmonic Damper. . . . . . 108 Cam. . . . . . . . . . . . . . . . . . . 112
Main Bolts . . . . . . . . . . . . . 143
Square Drive Damper. . . . 110 Cam Tower . . . . . . . . . . . . . 113
Engine & Accessory. . . . . . 143
Oil Pump Driveshaft . . . . . 110
Alternator. . . . . . . . . . . . . . 111
Fuel Pump Pushrod. . . . . . 111

4
 FASTENERS BY GROUP
Fasteners by Dimension 144 ARP
SAE Bolts A Brief History . . . . . . . . . . . . . . . . . . . . . . . 6
10/24 & 10/32. . . . . . . . . . 145 3/8-24 Reduced. . . . . . . . . 151
1/4-20. . . . . . . . . . . . . . . . . 146 3/8-24 Standard . . . . . . . . 151 The Manufacturing Process. . . . . . . . . . . . 7
1/4-28. . . . . . . . . . . . . . . . . 147 7/16-14 Standard . . . . . . . 152 Behind the Scenes. . . . . . . . . . . . . . . . . . . 12
5/16-18 . . . . . . . . . . . . . . . 148 7/16-20 Standard . . . . . . . 153
5/16-24 . . . . . . . . . . . . . . . 149 1/2-13. . . . . . . . . . . . . . . . . 155 What ARP Can Do For You. . . . . . . . . . . . 13
3/8-16 Reduced. . . . . . . . . 150 1/2-20. . . . . . . . . . . . . . . . . 156
3/8-16 Standard . . . . . . . . 150

Metric Bolts ARP Tech Guide

M6 x 1.0. . . . . . . . . . . . . . . 157 M10 x 1.50. . . . . . . . . . . . 159
M8 x 1.25. . . . . . . . . . . . . . 158 M12 x 1.50. . . . . . . . . . . . 160 The “Aerospace Quality” Myth. . . . . . . . 14
M10 x 1.25. . . . . . . . . . . . 159 M12 x 1.75. . . . . . . . . . . . 160
Motorsports Fastener Engineering for
the Non-Engineer . . . . . . . . . . . . . . . . . . . 18
Nuts
SAE 12-point . . . . . . . . . . . 161 SAE & Nyloc . . . . . . . . . . . . 163 Recognizing Common
Metric 12-point. . . . . . . . . 162 Serrated Flange. . . . . . . . . 164 Fastener Failures . . . . . . . . . . . . . . . . . . . . 22
SAE Hex . . . . . . . . . . . . . . . 163 Self-Locking. . . . . . . . . . . . 164
Metallurgy for the Non-Engineer. . . . . . 24
Washers Custom Fasteners . . . . . . . . . . . . . . . . . . . 31
SAE . . . . . . . . . . . . . . . . . . . 165 Insert Washers. . . . . . . . . . 169
Metric. . . . . . . . . . . . . . . . . 168 Weld Bungs. . . . . . . . . . . . 169 Material Specifications. . . . . . . . . . . . . . . 32

Glossary of Tech Terms. . . . . . . . . . . . . . . 34

Bulk Fastener Bins - 170
Head Fastener Measurements. . . . . . . . . 36
Installation Tools 171 General Torque Recommendations. . . . 37
Ultra-Torque. . . . . . . . . . . . 171 Thread Cleaning Proper Fastener Retention. . . . . . . . . . . . 40
Rod Bolt Stretch Chasers. . . . . . . . . . . . . . . . 174
Gauge. . . . . . . . . . . . . . . . . 172 Spark Plug Indexer. . . . . . 174 The Importance of
Thread Sealer. . . . . . . . . . . 172 Ring Compressors. . . . . . . 175 Proper Rod Bolt Stretch & Torque. . . . . . 53
Rod Bolt Extensions . . . . . 173 Ring Squaring Tools . . . . . 176
Rod Vise . . . . . . . . . . . . . . . 173 Oil Pump Primer Kits . . . . 176 Rod Bolt Length Monitoring Chart. . . . . 54

Rod Bolt Stretch & Torque Specs . . . . . . 55

Apparel 177 Head Studs versus Bolts. . . . . . . . . . . . . . 73

Terms & Conditions 179

Automotive Racing Products, Inc.

1863 Eastman Avenue, Ventura, CA 93003
ARP-bolts.com Copyright MCMXC-MMXXV Automotive Racing Products, Inc. All Rights Reserved. “ARP”,
the ARP logo, Wave-Loc, Perma-Loc, ARP2000, ARP3.5 and ARP Ultra-Torque are regis-
800-826-3045 tered trademarks of Automotive Racing Products, Inc. All other trademarks are property
of their respective owners.

5
THE COMPANY

ARP’s state-of-the-art manufacturing facility in Santa Paula.

A Brief History

They say that to be successful you must identify a need and satisfy
it. Back in 1968 racing enthusiast Gary Holzapfel saw that many of
his friends’ broken engines were caused by fastener failure. At the
time, there were no commercially available studs and bolts up to the
challenge. So Holzapfel called upon his many years of fastener mak-
ing experience for a leading aerospace subcontractor and founded
ARP® (Automotive Racing Products). In the ensuing years, the firm
has grown from what was literally a backyard garage workshop
into a highly diversified manufacturer with five operational entities
in Southern California with a combined area in excess of 148,000
square feet. These include forging, machining, finishing and pack- Gary Holzapfel
aging/warehousing facilities in Santa Paula and Ventura, California. Founder and chairman

There is even a unique racing-themed restaurant at the main Santa

Paula facility (called “Hozy’s Grill” -
which is open to the public).
Today, ARP’s product line contains
thousands of part numbers, and has
expanded to include virtually every fas-
tener found in an engine and driveline.
These range from quality high per-
formance OEM replacement parts to
exotic specialty hardware for Formula
1, IndyCar, IMSA, NASCAR and NHRA
drag racing and marine applications.
ARP’s customer list reads like a “who’s
who” of motorsports around the world.
In the past several years, virtually every
major championship on the planet has Three generations are now involved in the company –
Gary: founder & chairman, Mike: president, Ryan: manufacturing

6
 THE COMPANY

Packaging, warehousing and sales operations are handled out of Ventura.

been won with engines prepared by ARP customers. These include Nascar, IndyCar, Formula
1, IMSA, NHRA Top Fuel, Funny Car, Pro Stock & the ARP 6-second Club, Nascar Xfinity and
Camping World Truck Series. And so it goes. ARP works closely with many, many teams as a
supplier of engine and driveline fasteners, and has clearly become recognized as “the” pre-
eminent source for serious racers.
In addition to its core automotive business, ARP has an Aerospace Division, and is one of
the very few companies in the world fully licensed by the United States Government to man-
ufacture MS-21250 fatigue rated fasteners.
ARP also manufactures a variety of industrial fasteners on a contract basis, and is known for
its ability to promptly provide efficient solutions to problems at hand.

The Manufacturing Process

In order to ensure optimum quality control, ARP has grown to be exceptionally self-reliant
and now controls all aspects of the manufacturing process. All operations are performed

Material comes from the mill in large coils...which subsequently will be fed into cold-headers and formed into bolts.

7
THE COMPANY
in-house and closely monitored.
This is how ARP has been able to
establish a reputation for “zero
defects” quality throughout the
industry.
The process begins right at the
mill, where ARP orders only pre-
mium grade materials including
several proprietary alloys. The
ever-popular 8740 chrome moly
steel, for example, comes from
the mill in four distinct grades.
The lowest is “commercial,” which
is followed by “aircraft quali-
ARP’s bank of cold-headers can handle material up to 5/8˝ diameter and form bolts in a multi-phase oper-
ty.” ARP uses only the top two ation.

An overview of part of ARP’s expansive machining operations. The shop is laid out for optimum efficiency.

grades (SDF and CHQ), which

cost twice as much, but provide
the foundation for defect-free
fasteners. These materials come
in bar stock (for studs) and huge
coils (for bolts).
Most ARP fasteners start off on
a cold header, where the high
quality wire is cut to length and
the head and shank are formed
in a multi-stage forging process
that contributes to the strength
of the overall fastener. A few of
our fasteners are cut from bar Heat-treating is critically important in obtaining the correct tensile strength.
Fasteners are placed in special vertical racks to ensure complete 360˚ penetration.

8
 THE COMPANY
stock and hot headed.
Following the cold/hot forging,
material is heat-treated to desired
levels. This crucial process is done
entirely in-house to assure total
quality control. ARP uses custom
vertical racks to hold each piece
individually and assure complete
360° penetration. This is far supe-
rior to commonly-used methods of
dumping items into a large bin and
batch-treating.
Studs are centerless ground to
The Grinding Department is where all studs are centerless ground to ensure that they are concentric guarantee concentricity. The thread
and straight.
rolling operation (to MIL-S-8879A
specs) is done after heat-treat, which

Powerful cold-forging equipment is used to make ARP’s hex and 12-point nuts. Multi-stage dies are
employed to precision-form the finished “blanks.” accounts for a fatigue strength up to
twenty times higher than fasteners
which are threaded prior to heat-
treat.
ARP manufactures nuts in a multi-
step process that begins with raw
material being fed into a giant form-
ing device that “blanks” the hex
and 12-point nuts and continues
with highly sophisticated, automat-
ic tapping machines that tap each
nut with an accuracy of .001˝ (which
is five times higher than the aero-
space standard). This ensures an
A series of CNC-threading machines are employed by ARP to accurately tap the threads in nuts. exceptionally close-tolerance fit
Tolerances held are better than aerospace standards.

9
 THE COMPANY
between the bolt/stud and nut.
Metal finishing is also per-
formed in-house at ARP.
Operations include black
oxide coating of chrome moly
or polishing stainless steel to a
brilliant luster.
Also on the premises is a
fully-equipped lab for R&D and
quality control. It has every-
thing required to ensure that
ARP products measure up to
the company’s ultra high stan-
dards. Some of the tests that
ARP personnel perform on a
daily basis include ultimate ten- A bank of CNC machining centers are employed at ARP to perform specialty operations.
sile strength (using a 120,000
lb. capability tensile machine),
fatigue cycle (Amsler) and
hardness (Rockwell). Visual
inspections include use of an
optical comparator (to check
thread root contour, etc.),
fixtured micrometers and
microscopic grain flow anal-
ysis. The computer-controlled
fatigue cycle testers allow ARP
to take fasteners to a failure
point in millions of cycles – as State-of-the-art EDM technology is used to perform special operations,
such as hex-broaching head studs.

Fasteners are shot-peened to improve fatigue life. The finishing touch for most chrome moly
fasteners is the black oxiding operation.

10
 THE COMPANY
opposed to the aerospace norm of 65,000
average to 130,000 cycles maximum. This
allows ARP engineers to verify the design
specifications of each fastener, and prove its
ability to provide superior long-term service.
Finished products are packaged and
warehoused in ARP’s Ventura facility, which
is also home to the firm’s customer service,
technical and sales office.

The finished goods are given a protective coating and stored in sealed contain-
ers, awaiting packaging. Millions are in stock!

After final packaging the kits are placed in storage racks and are ready for order High powered magnifiers are used to carefully inspect critical components. ARP’s
fulfillment. Over 5,000 SKU’s are warehoused. quality control team is relentless!

Components for each kit are placed on the appropriate display cards, sealed and ARP has two highly sophisticated Amsler fatigue machines,
labeled. Through-put has been significantly increased. which test fasteners through millions of cycles.

11
 THE COMPANY
Behind The Scenes

Manufacturing high performance and race

fasteners is very different from making com-
mercial fasteners. As you read further into
this ­catalog, you will get a better idea of the
extraordinary steps taken by ARP to produce
the strongest, most reliable fasteners of their
kind on the market today.
The foundations of ARP’s fastener technology
were laid by founder Gary Holzapfel, President Robert Logsdon
Q.C. Consultant
Mike Holzapfel and engineers Russell Sherman,
P.E. and Dr. Kenneth Foster. This team used
their vast experience in fastener manufacturing
and design, metallurgy, mechanical engineer-
ing and stress analysis to create fasteners that
suited the unique needs of racers in every form
of racing.
Building on this foundation, ARP worked with
racing industry legends like Carroll Smith and
Smokey Yunick to bring direct input from the
racer’s perspective.
As ARP’s involvement with professional race
teams increased dramatically, the feedback
loop drove continuous innovation in all of the
fasteners ARP designs and manufactures.
ARP has channeled those five decades of
knowledge to continuously improve existing A series of special checking devices are employed to monitor
the quality of threads. For every thread size, there is a checking device.
fasteners and kits, as well as create new ones
for everything from diesel trucks to personal
watercraft to the fastest land speed vehicles in
the world.
ARP has worked with Robert Logsdon to
improve its quality control systems and cre-
ate a culture of continuous improvement.
He brought to ARP decades of experience
in the areas of Metrology, Quality Control,
Manufacturing, Acquisition and Configuration
Management. Logsdon is a graduate of the
U.S. Naval Academy of Metrology Engineering,
the Defense Management College and U.S.
Air Force Institute of Technology. Additionally,
ARP has one of the industry’s most complete
in-house R&D/QC facilities and a wide variety Two computer-controlled Instron tensile machines are used to determine the
ultimate tensile strength of studs and bolts.

12
 THE COMPANY
of testing equipment.
ARP also enjoys working relationships with many
of the most respected professional engine builders
and race teams from the world over — including
those involved in Formula1, IndyCar, IMSA, Nascar,
NHRA, IHRA, Lucas Oil Late Model Dirt, World of
Outlaws and a host of others. Constant interaction
with these racing experts to provide fasteners for
a wide variety of competition applications enables
ARP to stay on the ­cutting edge of fastener technol-
ogy development.
You will find ARP fasteners sold by leading per-
formance retailers and professional engine builders
around the world. These firms know that ARP fas-
teners are the standard of the industry, and smart
consumers will accept no substitutions. All ARP fas-
teners are proudly made in the USA to the industry’s
highest standards. ARP also supports racers through
generous contingency awards programs with many
racing programs.
ARP fasteners are prominently featured at leading performance retailers
worldwide.

What ARP Can Do For You

In addition to manufacturing a comprehensive array of cataloged fasteners for automotive

and aerospace applications, ARP thrives on the challenges of developing fasteners to solve
unique problems. Racers, Pro Street enthusiasts and street rodders have, over the years,
approached ARP about manufacturing special fasteners for unique applications, and the com-
pany has responded with innovative solutions.
ARP can provide complete R&D services, including metallurgical research, product design,
prototype machining and extensive laboratory testing. Moreover, ARP has experience man-
ufacturing fasteners from a wide variety of materials. All work can be performed under the
strictest confidence. ARP is well versed in facilitating proprietary research and custom manu-
facturing for corporations the world over.
It is for good reason that ARP is recognized as “The World Leader In Fastener Technology!”

See page 31 for more information on our Specials Department.

13
 FASTENER TECH
THE “AEROSPACE QUALITY” MYTH

In areas from hose ends to engine fasteners the terms “Aerospace material and Aerospace
Quality” have become buzz words implying the very best in design, materials and quality con-
trol.
“It isn’t necessarily so”, says Gary Holzapfel, founder and CEO of Santa Paula, California
based ARP, Inc. ARP (Automotive Racing Products) supplies extremely high strength and
fatigue resistant threaded engine fasteners to NASCAR, IndyCar, NHRA, IMSA and Formula
1 engine builders and manufacturers. Holzapfel explained his reasons in an interview with
Carroll Smith.

Smith: “Gary, do you believe that the term “aerospace quality” is over rated in the spe-
cialty fastener industry?”
“Yes I do. First of all, the term is meaningless. Any AMS (Aerospace Material Specification)
material must be matched to the specific application. As an example, some airframe bolts
(AN3-20) are legitimate “aerospace parts” and are very well suited for the low stress applica-
tions for which they were designed. But with a minimum ultimate tensile strength of 125,000
psi, and a relatively low temperature limit, they would be completely unsuitable for use in a
racing engine.
We started out in the aerospace fastener business and we understand it. That’s why we’re
not in it any longer. What is not generally understood about aerospace fasteners is that the
fastener manufacturers do not design the product. The nuts, bolts and studs are spec’d by
the airframe or engine designers and put out for bid. As long as the supplier certifies that the
product meets the minimum requirement of the specification and it passes the customer’s
inspection procedures, low bid wins.”

Smith: “Are you implying that the aerospace fastener manufacturers cut corners in order
to win contracts?”
“No, it’s a matter of manufacturing goals and simple economics. The aerospace market is
price dominated. In order to get the contract, the fastener manufacturer’s goal is to meet the
specification at the least cost, not to produce the best possible part.
This means that they are going to use the least expensive steel and manufacturing process-
es that will meet the specification. There is nothing wrong with this approach.
It certainly does not mean that certified aerospace fasteners are unsafe in any aspect. They
will do the job for which they were designed.
There is another factor. Airframe and aircraft engine manufacturers design their compo-
nents to a very high margin of safety. Further, aerospace structures are designed to be “fail
safe.” There is a back up or second line of defense for virtually every structural component so
that an isolated failure will not lead to disaster. They are also subjected to frequent and rigor-
ous inspections.”

Smith: “What’s different about motor racing?”

“Quite a lot, really. While the demands for strength, fatigue resistance and quality control can be
similar, and the assembly and inspection procedures in racing can be as rigorous as aerospace, in
professional racing very few parts are over designed and there are no fail safe features.

14
 FASTENER TECH
There are no back up provisions for component failure. A failed (or even loosened) nut or
bolt in a racing engine means disaster – instant catastrophic failure. An expensive engine is
destroyed and a race is lost.
That is why random failures are unacceptable in motor racing, and why aerospace stan-
dards should be only a starting point. This means that a specialist in the production of high
performance engine fasteners must design and manufacture the very best fasteners that can
be produced.”

Smith: “So where does the production for a new racing fastener begin?”
“The design process begins with the customer’s requirements the
This spring was wound
operating conditions and loads to be expected, the packaging con- from un-shaved
straints and the weight and cost targets. This allows us to select the material.
It failed on the
optimum material for the part, and to do the initial mechanical design. seam line.
There is more to material selection than simply choosing the best
alloy. It means using only the cleanest and purest steel available,
which, in turn, means researching to identify the best and most mod-
ern steel mills. It means working closely with the mills both to insure
consistent quality and to develop new and better alloys.
There are not only a myriad of alloys to choose from; but for each
alloy there are several grades of “aircraft specification” steel wire from
which fasteners can be made. We believe that only the top (and most
expensive) grade – shaved-seamless, guaranteed defect-free – is suitable for racing engine
applications.
We also believe that samples from each batch should be subjected to complete ­metallurgical
inspection.”

Smith: “How many alloys do you work with?”

“We are currently producing fasteners from at least 10 different steel alloys from 8740
chrome moly to the very high strength chromium-cobalt-nickel alloys such as Custom Age
625+. We also use stainless steel and titanium. With UTSs (Ultimate Tensile Strength) from
180,000 to 270,000 psi, we can suit the material to the job and the customer’s cost restraints.
We are continually researching and experimenting with new alloys and manufacturing pro-
cesses – some with all around better strength and fatigue properties.”

Smith: “Once the design work is done and material has been selected, what’s next?”
“Next comes the actual process of manufacturing. It goes without
5 stage
saying that all high strength bolts must have rolled rather than cut “Cold Header”
threads, and that the threads must be rolled after heat-treatment. used in the production
of ARP bolts
But there is more to it. The old saying to the effect of, “If you are
doing something in a particular way because that’s the way it has
always been done, the chances are that you are doing it wrong,” holds
true in fastener technology.
Technology advances, and we have to advance with it. All of the
manufacturing processes should be subject to continuous experi-
mentation and development. As an example, with some alloys, cold

15
 FASTENER TECH
heading produces a better product than hot heading, and vice versa.
The number and force of the blows of the cold heading machine
can make a significant difference in the quality of the end product.
Excessive numbers of blows can lead to voids in the bolt head. ARP,
in fact, holds significant patents on cold heading procedures for
the higher nickel and cobalt based alloys. In a typical aerospace
manufacturing process, these alloys are hot headed from bars,
reduced in diameter from 48 to 50% by cold drawing, resulting
in a hardness of about Rockwell C46 which is too hard for cold
heading. So, the blanks are locally induction heated in a very
narrow temperature envelope and hot headed.
If care is not taken the process can reduce the hardness
of the bolt head and the area immediately under it as
much as 3 to 5 points on the Rockwell C scale. Subsequent
heat-treatment does not restore this partially annealed area
to full hardness and strength. Therefore, the final result can
be a relatively soft headed bolt. This process is not preferred
by ARP.
Our patented process begins with a softer wire that can
be cold forged. The process work hardens the head and the under head area
to the desired hardness. We then power extrude the front end to achieve the reduction and
hardness in the shank resulting in a bolt with even strength and hardness from end to end.
The same is true of thread rolling. Temperature and die speed must be controlled and
changed for different alloys. Many bolt manufacturers who meet the Aerospace Specifications
don’t come close to meeting our standards. We consistently go beyond ­standard aerospace
specs.
Our concern with the manufacturing processes extends to the details of heat-treating,
shot-peening, fillet rolling and grinding – down to the frequency of dressing the grinding
wheels. In the arena where aerospace standards are a starting point and random failures are
unacceptable, I feel ARP stands alone as a primary engineering and manufacturing source for
specialty and custom fasteners for use in motorsports.
It is important to realize that simply quoting an AMS (Aerospace Material Specification)
number without strength and percentage of elongation numbers is meaningless. Statements
that the use of a particular material will, in itself, result in extreme strength and resistance to
fatigue can be misleading. In the world of high strength alloys, whether they are used for bolts
or for landing gears, the manufacturing processes are at least as important as the material
specification.
Some in our industry claim to inspect materials at the “molecular” level. In metallurgical
terms, molecules are not necessarily part of the vocabulary. Our engineers tell us that talking
about molecules is misleading. When reference is made to metal, it is typically in terms of
atom structures. We routinely check metallurgical features microscopically. By the way, the
same is true for claims of manufacturing to “zero tolerance.”
“Our engineers tell us that this is technically unrealistic.”

16
 FASTENER TECH
Smith: “How does the actual process work at ARP?”
“For each new design, we produce a number of prototype parts using different design
aspects and sometimes different methods.
We inspect and test after each process, choose the best design and method of manufacture,
and then freeze the design and write the manufacturing specification.”

Smith: “You have mentioned the importance of fatigue resistance. Is there a difference in
the procedures for strength and fatigue testing between
aerospace and the specialty racing industry?”
“Yes. While the ultimate tensile strength testing is the
same, fatigue testing is different. Aerospace fasteners are
fatigue tested to the relevant specification of fluctuating
tension load and n ­ umber of cycles typically 130,000 cycles
with the high tension load at 50% of the UTS and the low
load at 10% of the high load. If all of the test samples last
85,000 cycles (per AMS 5842-D), the lot is accepted.
Even though racing fasteners are not continuously sub- Fatigue, tensile and hardness testing are key quality
control checks.
jected to their maximum design load, at 18,000 rpm,
100,000 cycles takes just 5 minutes, thirty-four seconds. Except for drag racing, measured in
seconds, no race lasts just 5 minutes. Therefore we consider this Aerospace Standard to be
inadequate. At ARP, we fatigue test to elevated loads (10% above aerospace requirements)
and to a minimum cycle life that exceeds 350,000 cycles. The majority of samples are routinely
tested to one million cycles. During material development...and in the case of extremely criti-
cal new designs, we test to destruction.
Thread rolling is the last mechanical operation in our manufacturing process. For each pro-
duction run the thread rolling machine is shut down after a few parts. These parts are inspected
for dimensional accuracy and thread quality, and are physically tested for both strength and
fatigue before the run is continued. Random samples are inspected and tested throughout the
run. Extremely critical components are individually inspected for dimensional integrity.”

Smith: “What about out-sourcing?”

“Economics often dictate that many processes in the manufacture of aerospace fasteners
are farmed out. In the early days, ARP began as an out-source thread rolling shop.
Over the years, however, we have found, through experience, that the only way to main-
tain the quality we require is to keep everything in-house. From heading through machining,
grinding, heat-treat, thread rolling, and shot-peening to black oxide treatment we perform
every operation in house on our own equipment with our own employees.”

Smith: “Gary, One of the things that I am hearing is that every aspect of the manufacture
of racing engine ­fasteners is more expensive than that of similar a ­ erospace items.”
“True, but the bottom line is that we have to look at the cost aspect of the very best fastener
versus the cost aspect of a blown engine and a lost race. In the end, the manufacturing of fas-
teners for racing comes down to a matter of attitude; a refusal to accept published standards
and procedures as the best that can be done and most of all a determination to learn and to
make still better products.”

17
 FASTENER TECH
Motorsports Fastener Engineering for the Non-engineer

There are literally hundreds of standards and specifications – for all types of applications, from
bridges to rockets. None are as critical as those required for real-world motorsports applications. In
an environment where lighter is faster there is clearly no room for redundant fasteners, like those
found in military and aerospace applications. The mere nature of Motorsports requires designers
to produce fasteners that are light; yet tough, fatigue-resistant and reliable beyond other acknowl-
edged application standards. The design and production of fasteners, exclusively for racing, clearly
involves many complex factors. Some are so unique and complex that no standards or design cri-
teria exist. This means that everyone at ARP is entirely dedicated to the development and analysis
of appropriate bolt designs exclusively for special applications. Our designs take into account the
special loads that must be carried, the material selection, the manufacturing processes and the
methods of installation required to deliver ARP quality and reliability.

It is hoped that by providing an overview of the engineering, design and production techniques
ARP applies daily, you – as the end user – will be better equipped to evaluate your initial fastener
requirements, effectiveness and performance.

Design Procedures for Automotive Bolts

Presented by Dr. Kenneth Foster, PhD

The design of automotive bolts is a complex process, involving a multitude of factors. These
include the determination of operating loads and the establishment of geometric configu-
ration. The process for connecting rod bolts is described in the following paragraphs as an
example.
The first step in the process of designing a connecting rod bolt is to determine the load
that it must carry. This is accomplished by calculating the dynamic force caused by the oscil-
lating piston and connecting rod. This force is determined from the classical concept that
force equals mass times acceleration. The mass includes the mass of the piston plus a portion
of the mass of the rod. This mass undergoes oscillating motion as the crankshaft rotates. The
resulting acceleration, which is at its maximum value when the piston is at top dead center
and bottom dead center, is proportional to the stroke and the square of the engine speed.
The oscillating force is sometimes called the reciprocating weight. Its numerical value is pro-
portional to:

It is seen that the design load, the reciprocating weight, depends on the square of the RPM
speed. This means that if the speed is doubled, for example, the design load is increased by
a factor of 4. This relationship is shown graphically below for one particular rod and piston.

18
 FASTENER TECH
Motorsports Fastener Engineering for the Non-engineer

A typical value for this reciprocating weight is in the vicinity of 20,000 lbs. For purposes of
bolt design, a “rule of thumb” is to size the bolts and select the material for this application
such that each of the 2 rod bolts has a strength of approximately 20,000 lbs. (corresponding
to the total reciprocating weight). This essentially builds in a nominal safety factor of 2. The
stress is calculated according to the following formula:

so that the root diameter of the thread can be calculated from the formula:

This formula shows that the thread size can be smaller if a

stronger material is used. Or, for a given thread size, a stronger “H” beam-deformed.

material will permit a greater reciprocating weight. The graph Total translation
contours.
(see page 20) shows the relationship between thread size and For loading in
tension due to
material strength. acceleration forces
It must be realized that the direct reciprocating load is not at 8000 RPM

the only source of stresses in bolts. A secondary effect arises

because of the flexibility of the journal end of the connecting
rod. The reciprocating load causes bending deformation of the
bolted joint (yes, even steel deforms under load). This defor-
mation causes bending stresses in the bolt as well as in the rod
itself. These bending stresses ­fluctuate from zero to their maxi-
mum level during each revolution of the crankshaft.
The next step is to establish the details of the geometric con-
figuration. Here the major consideration is fatigue, the fracture
that could occur due to frequent repetition of high stresses,
such as the bending stresses described above. Several factors

19
 FASTENER TECH
Motorsports Fastener Engineering for the Non-engineer

must be considered in preventing fatigue; attention to design details is essential.

Fatigue failure is frequently caused by localized stress risers, such as sharp corners. In bolts,
this would correspond to the notch effect associated with the thread form. It is well known
that the maximum stress in an engaged bolt occurs in the last engaged thread. By removing
the remaining, non-engaged threads, the local notch effect can be reduced. This leads to
the standard configuration used in most ARP rod bolts: a reduced diameter shank and full
engagement for the remaining threads. Providing a local fillet radius at the location of the
maximum stress further reduces the local notch effect. Thus this configuration represents the
optimum with respect to fatigue strength.
The reduced diameter shank is helpful in another sense. It reduces the bending stiffness
of the bolt. Therefore, when the bolt bends due to deformation of the connecting rod, the
bending stresses are reduced below what they would otherwise be. This further increases the
fatigue resistance of the bolt. A typical bolt configuration is shown below.

Once the bolt configuration has been established, the manufacturing process comes into
play. This involves many facets, which are discussed in detail elsewhere. Here, however, one
process is of primary interest. With respect to bolt fatigue strength, thread rolling is a major
consideration. Threads are rolled after heat treating. This process, which deforms the metal,
produces a beneficial compressive stress in the root of the thread. It is beneficial because it
counteracts the fluctuating tensile stresses that can cause fatigue cracking. If heat-treatment
were to occur after rolling, the compressive stresses would be eliminated. This would there-
fore reduce the fatigue resistance of the bolt.
An additional factor must be taken into account in defining the bolt configuration: the
length of engaged thread. If too few threads are engaged, the threads will shear at loads that
are lower than the strength of the bolt. As a practical matter, the thread length is always select-
ed so that the thread shear strength is ­significantly greater than the bolt tension strength.
This problem is especially important in bolts used in aluminum rods because of the fact that
the shear strength of aluminum is much lower than the shear strength of steel.

20
 FASTENER TECH
Motorsports Fastener Engineering for the Non-engineer

Finally, although not a design parameter, the subject of bolt installation clamp load must
be addressed. It is a fundamental engineering concept that the force in a bolt in an ideal
preloaded joint will remain equal to the clamp load until the externally applied force exceeds
the clamp load. Then the force in the bolt will be equal to the external force. This means that
fluctuating external forces will not cause fluctuating forces in a preloaded bolt as long as the
clamp load exceeds the external force. The result is that fatigue failure will not occur. In a
non-ideal joint, such as in a connecting rod, the bolt will feel fluctuating stresses due to fluc-
tuating rod distortions. These are additive to the clamp load, so that fatigue could result. In
connecting rods, precise clamp loads are required because if they are too low, the external
forces (the reciprocating weights) will exceed the clamp load, thus causing fatigue. If they are
too high, they provide a high mean stress that combines with the fluctuating stresses due to
rod distortion. Again, fatigue is promoted. The objective, then, is to preload a bolt so that it just
exceeds the external load, and no higher. To sum up: both insufficient and excessive clamp
loads can lead to fatigue failures.

Appropriate clamp loads are specified for each ARP bolt. These clamp loads can be
attained in a connecting rod by applying proper torque using a torque wrench or by measur-
ing the amount of stretch in the bolt using a stretch gauge (it is known that a bolt stretches in
proportion to the tension in it). The torque method is sometimes inaccurate because of the
uncertainty in the coefficient of friction at the interface between the bolt and the rod. This
inaccuracy can be minimized by using the lubricant supplied by ARP.
Other factors, equally as important as design, include material selection, verification testing,
processing, and quality control. These aspects of bolt manufacturing are discussed elsewhere
in this document.
The foregoing discussion concentrated on the design of bolts. The same considerations
apply in the design of studs.

21
 FASTENER TECH
Recognizing Common Failures

There are six types of metallurgical failures that affect fasteners. Each type has unique iden-
tifying physical characteristics. The following chart is designed to be used like a spark plug
reading chart to help analyze fastener failures. While few of us have access to sophisticated
analysis equipment, a standard Bausch and Lomb three lens magnifying glass will generally
show 98% of what we want to see. Several of the photos below have been taken utilizing a
Scanning Electron Microscope (SEM) and are presented to simply illustrate typical grain con-
figurations after failure.

1. Typical Tensile Overload

In a tensile overload failure the bolt will 1.
stretch and “neck down” prior to rupture. One
of the fracture faces will form a cup and the
other a cone. This type of failure indicates that
either the bolt was inadequate for the installa-
tion or it was preloaded beyond the material’s
yield point.

2. Torsional Shear (twisting)

Fasteners are not normally subjected to tor-
sional stress. This sort of failure is usually seen 2.
in drive shafts, input shafts and output shafts.
However we have seen torsional shear failure
when galling takes place between the male
and female threads (always due to using the
wrong lubricant or no lubricant) or when the
male fastener is misaligned with the female
thread. The direction of failure is obvious and,
in most cases, failure occurs on disassembly.

3. Impact Shear
Fracture from impact shear is similar in
appearance to torsional shear failure with flat 3.
failure faces and obvious directional traces.
Failures due to impact shear occur in bolts
loaded in single shear, like flywheel and ring
gear bolts. Usually the failed bolts were called
upon to locate the device as well as to clamp
it and, almost always, the bolts were insuffi-
ciently preloaded on installation. Fasteners
are designed to clamp parts together, not to locate them. Location is the function of dowels.
Another area where impact failures are common is in connecting rod bolts, when a catastroph-
ic failure, elsewhere in the engine (debris from failing camshaft or crankshaft) impacts the
connecting rod.

22
 FASTENER TECH
Recognizing Common Failures

4. Cyclic fatigue failure originated by hydrogen embrittlement.

L-19, H-11, 300M, Aeromet 100 and other
similar high strength “quench and temper” 4.
steel alloys, popular in drag racing, are particu-
larly susceptible to “hydrogen embrittlement.”
Extreme care must be exercised when han-
dling these materials, and kept well oiled at all
times to prevent hydrogen gas and moisture
from accumulating and attacking the metal.
This type of failure is easily mistaken with Stress
Corrosion. The spot on the first photo is the origin of the crack and the original stress riser. The
second photo is a SEM photo at 30X magnification.

5. Cyclic fatigue cracks propagated from a rust pit (stress corrosion)

Again, L-19, H-11, 300M and Aeromet 100,
are particularly susceptible to stress corrosion, 5.
while 8740 and ARP2000 alloys are less sus-
ceptible to stress corrosion. These materials
must be kept well oiled at all times and never
exposed to moisture including sweat. The pho-
tos illustrate such a failure. The first picture is
a digital photo with an arrow pointing to the
double origin of the fatigue cracks. The second
photograph at 30X magnification shows a third arrow pointing to
the juncture of the cracks propagating from the rust pits. Inconel 718, ARP 3.5 and Custom
Age 625+ are immune to both hydrogen embrittlement and stress corrosion.

6. Cyclic fatigue cracks initiated by improper installation clamp load

Many connecting rod bolt failures are caused
by insufficient clamp load. When a fastener is 6.
insufficiently preloaded during installation the
dynamic load may exceed the clamping load
resulting in cyclic tensile stress and eventual
failure. The first picture is a digital photo of
such a failure with the bolt still in the rod. The
white arrows indicate the location of a cut made
to free the bolt and the black arrow shows the
origin of the fatigue crack. In the second picture – an SEM photo at 30X magnification clearly
shows (1). The origin of the failure and the telltale “thumbprint” or “beach mark” (2). Tracks of
the outwardly propagating fatigue cracks and (3). The point where the bolt (unable to carry
any further load) breaks-away.

23
 FASTENER TECH
Metallurgy for the Non-Engineer

The following material is intended to provide a brief overview of the metallurgical con-
siderations that, daily, influence the design and production of the most reliable fasteners in
motorsports. It is hoped that a simple understanding of the knowledge and commitment
required to produce this reliability will make your future fastener decisions much, much easier.

By Russell Sherman, PE

1. What is grain size and how important is it?

Metals freeze from the liquid state during melting from many origins and each one of these
origins grows until it bumps into another during freezing. Each of these is a grain and in cast-
ings, they are fairly large. Grains can be refined (made smaller); by first cold working and then
by recrystallizing at high temperature. Alloy steels, like chrome moly, do not need any cold
work; to do this – reheat treatment will refine the grain size. But austenitic steels and aluminum
require cold work first. Grain size is very important for mechanical properties. High tempera-
ture creep properties are enhanced by large grains but good toughness and fatigue require
fine grain size – the finer the better. All ARP bolts and studs are fine grain – usually ASTM 8 or
finer. With 10 being the finest.

2. How do you get toughness vs. brittleness?

With steels, as the strength goes up, the toughness decreases. At too high a strength, the
metal tends to be brittle. And threads accentuate the brittleness. A tool steel which can be
heat-treated to 350,000 psi, would be a
disaster as a bolt because of the threads.

3. Define Rockwell as we use it. Why

do we use the C scale?
A man named Rockwell developed a
means of measuring hardness of metals
which was superior to other methods. A
Rockwell hardness tester measures the
depth of penetration into the metal when
a load is applied. For hard materials,
a diamond penetrator is used. For soft
material, small balls are used – 1/16˝
or 1/8˝ diameter-and the machine mea-
sures the depth. We use the C scale for the ARPelements
engineers use “Scanning Electron Microscopic” inspection capable of detecting all
in the periodic table with atomic numbers greater than 5 – permitting the
120,000 psi strength level and above. The C acquisition of high resolution imaging.
scale uses the greatest load – 150 Kg. The A
scale uses only a 60 Kg. load but can be correlated with C. It is necessary to use the A scale
for thin sheets because using the 150 Kg load would cause the diamond to penetrate almost
all the way through.

24
 FASTENER TECH
Metallurgy for the Non-Engineer

4. What is “micro hardness?”

Some parts are too small to be Rockwell
hardness tested. They are placed in hard plas-
tic and a microscope is used to place a small
indenter into the metal. Using the microscope
the length of the impression is measured.

5. How does modulus of elasticity refer to

our products?
The modulus of elasticity of all alloy steels is
exactly the same – 30,000,000 psi. This is true
whether it is heat-treated or not – whether it is
100,000 psi strength level or 300,000 psi. Metals are like a spring – put a load on them and
they will stretch – double the load and they will stretch double. This is important in connecting
rod bolts because by measuring the stretch we really are measuring the load. Load is what is
important and measuring stretch of a given size and configuration bolt will indicate how much
load is stretching the bolt.

6. What are metal carbides and what is

their significance?
The strength of all alloy and carbon steels
is derived from the metal carbides formed
during heat treat. The carbon in steels com-
bines with iron, vanadium and with chromium,
as well as many other metal alloy additions to
form compounds, which are a very hard phase
within the iron matrix. Tool steels generally
have high carbon content (above .8%) and can
be made very hard – but brittle.

7. What exactly is chrome?

Chrome is the metal chromium and is typically used for plating because it is shiny. It is also
used as an alloy addition to iron to form a stainless steel. A stainless steel must contain at least
12% chromium, but these lean chromium steels can still show some rust on the surface. Using
18% chromium will make a more rust resisting stainless. Exposing any stainless to oxygen at
temperatures above 1200˚F will cause the chromium to join the oxygen and therefore leave
the surface depleted in chromium. If it falls below 12% the surface will show rust.

8. What does it mean when a broken part looks crystallized?

When the fracture face has a rocky appearance it is because the material had a very large
grain structure. Basically the grain grew during manufacturing due to poor technique and han-
dling. A properly processed part will have a silky smooth appearance which is an indication
of fine grain size. So crystallization does not occur as a result of load or fatigue – it was present
in the material at the time of manufacture.
25
 FASTENER TECH
Metallurgy for the Non-Engineer

9. Define “precipitation hardening” and “phase change.”

The precipitation hardening comes from microscopic precipitation of hard phases which
serve to keep rows of atoms from moving under stress. Some metals undergo a change
in atomic structure at high temperature. Alloy steels, which are bcc at room temperature,
become fcc at temperatures above 1400°F. This switch over is called a phase change. When
cooled down they revert back to the bcc structure. Management of this phase is extremely
critical and ARP maintains a complete in-house heat-treatment facility. It’s the only way we can
assure material integrity.

10. What does a “face centered cubic” (fcc) atom arrangement look like? How many atoms?
A face centered cubic arrangement of atoms (aus-
tenitic) looks like a Las Vegas die with a five showing
on all six faces. This can’t be seen visually by any type
of microscope.
The number of atoms in any one cubic cell would
be 14 – these do not stand alone but are attached
to other cells which share some of the atoms.

11. How does a “body center cubic” (bcc) atom look? How many atoms?
The body center cubic structure would look like
a die with a four on all faces and one atom in the
center of the cube. The atomic arrangment of
pure iron is bcc at room temperature and does not
change until the temperature reaches 1674˚F. At this
temperature it changes to austenite which is face
center cubic (fcc). The addition of carbon to the iron
lowers this transition temperature. This is the basis
for heat treatment of steel. If the iron carbon alloy
(steel) is quenched from the fcc field, the structure
becomes martensite, a very hard strong condition.

12. What does a “stainless steel” atom arrangement look like?

The 300 Series stainless steels are face-centered cubic and are not heat-treatable. Heavy
reduction (power dumping), in the cross section, during forging causes a dramatic increase in
strength. This is the process ARP uses to make 304 Stainless reach 170,000-190,000 psi UTS.

26
 FASTENER TECH
Metallurgy for the Non-Engineer

13. How do the space lattice or crystal structures appear?

All grains or crystals are composed of atoms bound together in a definite pattern. These
structures are called space lattice or crystal structures. At a fixed temperature, the atoms in
an array are spaced a definite distance from one another, although they vibrate about their
mean position. Even though atoms are actually not held together in this manner, it is helpful to
picture the crystals as a 3-dimensional latticework connected by imaginary lines. Metallurgists
who primarily study ferrous metal are interested in only two basic crystal structures: bcc
(body-centered cubic) and fcc (face-centered cubic).

14. What are the metallurgical ramifications of “cold heading” vs. “hot heading?”
Cold heading is a more efficient process and allows the part to be cold worked. The tem-
peratures used for hot forging will reduce the effect of work hardening. This is important for
metals which derive much of their strength from the cold work. Cold heading produces a
better product than hot heading. The number and force of the blows of the cold heading
machine can make a significant difference in the quality of the end product. Excessive num-
bers of blows can lead to voids in the bolt head. ARP, in fact, holds significant patents on cold
heading procedures for the higher nickel and cobalt based alloys.
Our patented process begins with a cold drawn
wire that can be cold forged. The process work hard-
ens the head and the under head area to the desired
hardness. We then power extrude the front end to
achieve the reduction and hardness in the shank
resulting in a bolt with even strength and hardness
from end to end.
In a typical aerospace manufacturing process,
these alloys are hot headed from bars, reduced in
diameter from 48 to 50% by cold drawing, result-
ing in a hardness of about Rockwell C46 which is
too hard for cold heading. So, the blanks are locally
induction heated in a very narrow temperature envelope and hot headed. The process reduc-
es the hardness immediately in the area under the head approximately 3 to 5 points on the
Rockwell C scale. Subsequent heat treatment does not restore this partially annealed area
to full hardness and strength. The final result is a relatively soft-headed bolt. Therefore, this
process is not used by ARP.

15. What is the difference between the usage of “bar” material vs. “wire?”
Bars produced by the mill in straight sections are normally shipped in 12 foot lengths. Wire
is supplied in continuous coil form and is hundreds of feet in length. Bars are cut to length and
the bolts are hot forged from these lengths. Wire on the other hand is fed into a cold header
in a continuous manner.

16. What exactly is A286? And to what is it compared?

A286 is a 25% nickel and 18% chromium alloy with smaller amounts of titanium and alu-
minum, which precipitate during aging – after solution treatment. It is a true stainless steel
27
 FASTENER TECH
Metallurgy for the Non-Engineer

due to the high chromium and it is

austenitic due to the high nickel. A286
was developed as a high temperature
alloy for use in pre-jet aircraft engines.
The strength level was only 140,000
psi, but it had good high temperature
strength and exceptional toughness,
making it an excellent fastener alloy.
Rocketdyne became interested in it
for rocket engines being developed in
the early 60’s. But they required high-
er strength. We were part of the team
that developed a thermo-mechanical method to produce a strength level of 200,000 psi. This
involved severe cold reduction after solution treatment and before aging. An aerospace mate-
rial spec (AMS) was then written requiring this treatment for 200,000 psi strength level. There
is no other steel alloy, at this level, which can match A286 for corrosion resistance, toughness
or bolt fatigue strength.

17. Define “Power Dump.”

This is a term used to define the heavy extrusion of the fastener body during forging. The part
is forced into a die much smaller than the blank thereby causing a severe reduction in cross
section area. This reduction of the cross sectional area is accompanied by an increase in length
because metals can’t be compressed. However, power dumping or reduction, delivers a sig-
nificant increase in strength properties and is part of the patented process we use to produce
fasteners from 304 stainless steel with 170,000-190,000 psi UTS and AMS 5844 (ARP 3.5) with
ultimate tensile strengths in
the 260,000- 280,000 psi
UTS range with outstanding
fatigue.

18. What is the difference

between 4130 and 8740
chrome moly?
Both are alloy steels with
similar chemistry. The 4130
has only .3% carbon and
can’t be hardened as high
as 8740, which has .4% car-
bon. Also, 8740 has about
.45% nickel and 4130 has
none. Both have moly (most
alloy steels have moly). The chromium content of 4130 is slightly higher, .95% instead of .55%.
However, 8740 is generally considered to have slightly better toughness due to the nickel.

28
 FASTENER TECH
Metallurgy for the Non-Engineer

19. What exactly is ARP2000 and how does it compare to 8740 and 4340?
ARP2000 is a heavily alloyed martensitic quench and temper steel. It has excellent stability
at high temperatures. But most important, ARP research discovered that in addition to tem-
perature stability it has excellent notch toughness in the higher strength ranges and is alloyed
to be tempered to Rockwell C45/47. 8740 and 4340 can be tempered to the same hardness.
But, the tempering temperature would yield material in the “temper brittle zone” (between
500° and 700°F), producing significant notch sensitivity. ARP2000 is tempered above that
temperature range and has a strength between 200,000 and 220,000 psi.

20. How does L19 compare to ARP2000?

L19 differs from ARP2000 in that it is a vacuum melted alloyed steel with sufficient chro-
mium and carbon to achieve high hardness (but below the level of a stainless steel). L19 is
air-cooled from the hardening temperature in a way that does not require an oil quench to
achieve full hardness and is tempered to assure full conversion to martensite between 1025°F
and 1075˚F. L19 is a proprietary material capable of achieving strengths of 220,000/230,000
or 260,000/270,000 psi as may be required. Both L19 and ARP2000 steels are modified bcc
(martensite) at room temperature. L19 has the same advantage as ARP2000 in that a high
strength is obtained at a high tempering temperature. This alloy is easily contaminated and
requires special handling.

21. What is AMS5844? And how does it compare to AMS5842E?

Both of these alloys are considered multiphase, non-steel, austenitic materials. Both derive
their strength (260,000 psi) from severe cold work (48/50%) which raises the hardness from
Rockwell C 46 up to 49/50. The AMS5842 (for MP159) was developed much later than
AMS5844 (for MP35) in order to increase the usable service temperature by about 100° so it
could be used in hotter sections of jet engines.

22. Provide a brief overview of the metallurgy required to produce AN, AMS & other
Aerospace type fasteners.
All alloy steel fasteners are essentially manufactured by the same process. Incoming steel
from the mill is forged to specification, then heat treated and thread rolled. Regular AN bolts
are forged to size and are normally not precision ground. They may even have threads on
them when heat treated.
Expensive aerospace fasteners are more likely suited for some motorsport applications.
These fasteners require precision forging, careful heat treatment and then precision grinding,
fillet rolling under the head and a great deal of skill in thread rolling.

23. What is moisture tolerance and how or where is it important?

Non-stainless steels have low moisture tolerances because the water attacks the steel by
forming iron oxide (rust). Therefore none of these have a high tolerance for moisture and the
surface must be protected by oil or plating. ARP maintains an in-house plating facility to assure
all non-stainless product is delivered 100% corrosion free.

29
 FASTENER TECH
Metallurgy for the Non-Engineer

24. What metallurgical issues cause common failures?

The most common cause of failure of connecting rod bolts (and wheel bolts) is too little
induced load (stretch) during installation. This allows the alternating load to impose cyclic
loading on the bolt. Over tightening is also another cause, because the induced stress is too
close to the yield point.

25. How do the various standards compare to each other with regard to fasteners?
Where are the standards?
A standard fastener is one that can be referenced from a nationally or internationally recog-
nized standards document and may be produced by any interested manufacturer.
In all fastener categories the custodian of each group (MS-AN-NAS) has tried to standardize
the processing of specifications such as heat-treating per MIL-H-6875, cadmium plating per
AMS QQ-P-416, passivation per AMS QQ-P-35 and testing, per MIL.-Std 1312, among others.
ASTM stands for the American Society for Testing Materials, a large industry funded group
used to write standards for many materials and testing procedures. It compares directly to
AMS (Aerospace Material Standard).
In the case of ARP, 100% raw material is purchased to AMS specification – with the exception
of special alloys used in proprietary products. All materials are carefully examined for proper
chemistry – and finally, periodic examination by an independent laboratory. ARP consistently
strives to exceed industry specifications for quality and product management.

MS (Military Standards): MS bolt specifications cover a wide range of fastener hardware,

high strength bolts, nuts and washers with spec’s for materials and processing. MS fasten-
ers have various tensile strengths.

AN (Army-Navy) Specifications: Generally lower strength bolts and studs primarily in the
125,000 psi UTS range. AN also covers a wide range of nuts, washers and other hardware.

NAS (National Aerospace Standard): These specifications cover fasteners in the strength
ranges 160,000/180,000/200,000 psi UTS.

ISO (International Standards Organization):

ISO 9001-94: is a quality control system designed for manufacturers with design control.

ISO 9002-94: is a quality control system designed for manufacturers who build parts to cus-
tomer specifications, and do not have design control.

ISO 9001:2015: is current ISO system well suited for manufacturers with engineering design
functions, drawing control and statistical techniques to achieve demanding quality require-
ments.

AS (Aerospace Standard)

AS9100:2016: is an Aerospace Quality Management System that includes and expands on

all ISO requirements with focus to further improve product quality and meet or exceed
customer requirements.
30
 FASTENER TECH

ARP SPECIAL ORDER FASTENERS

ARP can custom manufacture fasteners from nearly a dozen different materials, with tensile
strengths ranging from 170,000 PSI to 310,000 psi. By way of example, we have made cylin-
der head studs for the same application from 8740 chrome moly, our own ARP2000 and L19.

ARP’s in-house R&D and manufacturing capabilities allow for the design and manufacturing
of custom fasteners to your specific application. Serious inquiries from members of the high
performance industry are always welcome. Look to ARP to provide effective solutions to all
your fastener needs!

31
 FASTENER TECH
Material Specifications

ARP manufactures fasteners from a wide assortment of materials ranging from popular
stainless steel and 8740 chrome moly to exotic alloys that have been developed to handle
space travel. You should also know that there are grades within specific alloys. For example,
8740 is available in four grades: 1. SDF (guaranteed seamless and defect free). 2 CHQ (cold
head quality). 3. Aircraft. 4. Commercial. ARP uses only the first two (SDF and CHQ), even
though they cost more than double “Aircraft” quality.
STAINLESS STEEL: Ideally suited for many automotive and marine applications because
stainless is tolerant of heat and virtually impervious to rust and corrosion. ARP “Stainless 300”
and Custom 450 materials are specially alloyed for extra durability. Both are polished using a
proprietary process to produce a beautiful finish. Tensile strength is typically rated at 170,000-
190,000 psi.
8740 CHROME MOLY: Until the development of today’s modern alloys, chrome moly was
popularly considered a high strength material. Now viewed as only moderate strength, 8740
chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing
applications, but only if the threads are rolled after heat-treatment, as is the standard ARP pro-
duction practice. Typically, chrome moly is classified as a quench and temper steel, that can
be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.
ARP2000®: ARP2000 is an alloy steel that can be safely heat treated to a higher level,
producing a greater strength material than 8740. While 8740 and ARP2000 share similar char-
acteristics – ARP2000 is capable of achieving a clamp load at 220,000 psi. ARP2000 is used
widely in short track and drag racing as an up-grade from 8740 chrome moly in both steel
and aluminum rods. Stress corrosion and hydrogen embrittlement are typically not a problem,
providing care is taken to protect the parts from moisture and the parts are kept well-oiled.
L19®: This is a premium steel that is processed to deliver superior strength and fatigue prop-
erties. L19 is a very high strength material compared to 8740 and ARP2000 and is capable
of delivering a clamp load at 260,000 psi. It is primarily used in short track and drag racing
applications where inertia loads exceed the clamping capability of ARP2000. Like most high
strength, quench and temper steels – L19 requires special care to avoid hydrogen embrit-
tlement. This material is easily contaminated and subject to stress corrosion. It must be kept
well-oiled and not exposed to moisture.
AERMET®: With a typical tensile strength of 290,000-310,000 psi, Aermet is a new martensi-
tic super-alloy that is stronger and less expensive than the super-alloy austenitic materials that
follow. Because it is capable of achieving incredibly high clamping loads, it is ideal for short
but extreme environments like top fuel, funny car and some short track applications. Although
Aermet is a maraging steel that is far superior to other high strength steels in its resistance to
stress corrosion, it must be kept well-oiled and not exposed to moisture.
INCONEL 718: A nickel based material that is in the high temperature, super-alloy class, it
is found to be equally suitable in lower temperature applications. This material delivers tensile
strengths in the 210,000-230,000 psi range and exhibits improved fatigue properties. Best of
all, Inconel 718 is completely immune to hydrogen embrittlement and corrosion.
ARP3.5® (AMS5844): While similar to Inconel 718, these super-alloys are found in many jet
engine and aerospace applications where heat and stress attack the life of critical components.
The high cobalt content of this alloy, while expensive, delivers a material with superior fatigue

32
 FASTENER TECH
Material Specifications

characteristics and typically tensile strength in the 260,000-280,000 psi range. The immunity
to hydrogen embrittlement and corrosion of these materials is a significant design consider-
ation. These materials are primarily used in connecting rods where extremely high loads, high
RPM and endurance are important factors – Formula 1, NASCAR and IRL applications.
CUSTOM AGE 625 PLUS®: This newly formulated super-alloy demonstrates superior
fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric
corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for
fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace
MP-35 as the material of choice in the high strength, super-alloy field. Typical tensile strength
is 260,000-280,000 psi.
TITANIUM: ARP now offers special order fasteners made of an alloy (Ti6Al-4V) that is spe-
cially heat-treated (a process developed by ARP’s own Russ Sherman) and provides superior
strength to other titanium alloys employed in racing and aerospace. The material has a nom-
inal tensile strength of 180,000 psi, and is very corrosion resistant. The main advantage of
titanium, of course, is its weight – which is about 40% lighter than a comparable fastener made
of steel. Head studs and accessory bolts are ideal applications for this lightweight material.

QUICK REFERENCE GUIDE TO MATERIALS USED IN FASTENERS

MATERIAL USE? YIELD STRENGTH TENSILE STRENGTH USED FOR

Grade 5 No 90,000 psi 120,000 psi Accessory bolts & studs

Grade 8 No 120,000 psi 150,000 psi Accessory bolts & studs

“Stainless 300” Yes 140,000 psi 170-190,000 psi Accessory bolts & studs

Custom 450® Yes 150,000 psi 170-190,000 psi Accessory bolts & studs, head bolts

8740 chrome moly Yes 170,000 psi 190,000 psi Rod bolts, head & main studs & bolts

A286 Yes 170,000 psi 200,000 psi Head bolts, accessory bolts

ARP2000® Yes 200,000 psi 220,000 psi Rod bolts, head & main studs

L19® Yes 220,000 psi 260,000 psi Connecting rod bolts

Inconel 718 Yes 190-210,000 psi 210-230,000 psi head bolts, case studs & bolts

Custom Age 625+ Yes 235-255,000 psi 260-280,000 psi Head studs, connecting rod bolts

ARP 3.5® Yes 220-250,000 psi 260-280,000 psi Connecting rod bolts

AerMet® Yes 260,000 psi 290-310,000 psi Special products

Titanium Yes 160,000 psi 180,000 psi Head studs, accessory bolts

33
 FASTENER TECH
Glossary of Tech Terms

Austenitic: Refers to the atomic arrange- Knurling: A process of creating serrations

ment of some metals, such as nickel based in a part by rolling a die, under pressure,
alloys, and some steels with about 18% chro- against the part. Normally these serrations
mium. This atomic arrangement is called “face are very sharp and can create cracks and ARE
centered cubic.” Austenitic steels can not be stress risers. The process is used on knobs so
heat treated, but can be strengthened by cold the user can get a firm grip. But in the case of
working. fasteners, the body can be knurled so the part
CHQ: A term used to grade heading wire can be forced into and retained in an irregular
and stands for “cold heading quality.” This hole – stress risers and all.
grade is superior to both Commercial and Maraging: Refers to steels that are a low
Aircraft quality. carbon version of martensitic steels, special-
Clamp Load: The tensile load a fasten- ly alloyed so that the martensite is not hard.
er generates when torque is applied. Also These steels can be worked in the quenched
referred to as preload. condition and then be hardened by low tem-
Torque Cycle or Pull: A torque cycle or perature aging. The strength comes from the
pull is described as one tightening and one formation of complex metal carbides.
loosening (ON/OFF) process of a fastener Martensitic: Refers to atomic arrangement
and is the same as one installation and one and in the case of steels, is a modified body
removal of a fastener. centered cubic structure. These steels can
Fatigue: The process by which failure is be heat-treated because martensite is iron
caused after many repetitions of loads small- carbide, which is very hard. However, these
er than the ultimate strength of the material. steels can be hydrogen embrittled and will
Ferritic: Refers to steels with an atomic rust. Generally, martensite normally refers to
arrangement different from austenite and metal structures which are formed by quench-
martensite. These steels are not strong and ing from high temperature.
the widest use is in steam power plants and MS21250: A military specification for a
accessory fasteners made by some compa- 12-point, 180,000 psi bolt which specifies the
nies, because they are able to withstand wet fatigue load required for testing every size.
environments. Newer steels such as ARP300 Notch Sensitivity: Refers to the ability of
and A286 are far superior. a metal to withstand the increased stress at
Hydrogen Embrittlement: This condition a notch. Some materials, such as glass, crack
results from the accumulation of hydrogen gas very easily if notched. While others, such as
in the atomic structure of the metal. This gas soft gold or tin stretch out under stress – even
flows to the point of high stress (stress risers) with a notch. Normally, the stronger the steel,
and causes microscopic cracks. The hydrogen the more likely it is to break quickly at the
then flows to the “new” crack tip and causes notch. “Toughness” is wanted because this
it to crack further. In this way the crack moves is associated with opposite of notch sensi-
across the part, because the crack-tip IS the tivity. Austenitic metals are usually less notch
stress riser. Finally the crack gets so large that sensitive than martensitic steels of the same
the section is not large enough to support the strength levels.
load. No hydrogen embrittlement can take OAL: Means “Over All Length.”
place without tensile stress. ARP employs a Clamp Load Scatter: A term used to
baking process that purges all hydrogen gas describe the variation in clamp load a fas-
from the steel. tener generates due to fluctuating levels of
34
 FASTENER TECH
Glossary of Tech Terms

friction from one torque cycle to subsequent point it flows faster. Perhaps there is a rock in
cycles. Clamp load scatter generally reduces the middle – the river flows faster around the
after multiple cycles because the friction lev- rock. The stress at these points can be so high
els out and becomes more consistent. that the part will fail – even though the aver-
Qualified Products List: A government age stress on the part never exceeded the
requirement that simply mandates that bolts tensile strength of the part.
be manufactured only by companies which S.D.F.: Seam and defect free. A designation
have qualified by making bolts that have for premium steel. This is typically the highest
been submitted for testing and approval to grade available, and is the only steel used by
a government agency. ARP has qualified for ARP.
this list. Thread Engagement: This refers to the
Quench & Temper: A method of heat-treat- number of threads engaged in a nut or
ing martensitic steels. The parts are heated into threaded hole. Full engagement, meaning all
the austenitic range (usually above 1450˚F) the female threads are engaged, is a desirable
then quenched into water or oil. This leaves configuration to maximize fatigue strength.
the part in a very hard martensitic condition Ultimate Tensile Strength: The maximum
which then must be tempered by heating stress that a particular material can support
at lower temperatures (between 350˚F and without breaking. It is expressed in terms
1200˚F), depending upon the steel and of lbs. per square inch, and is measured by
strength desired. means of a tensile test. The maximum force
Reciprocating Load: The acceleration (lbs.) that a test specimen can support is
force exerted on a connecting rod due to the divided by the cross-sectional area (square
up and down motion of the piston and its inches) of the specimen, the result is ultimate
associated mass ie; wrist pin, rings, small end tensile strength in psi.
of the rod. Torque Angle: A method of tightening a
Stretch: The increase in length of a bolt fastener relative to the amount of degrees
when installed with a preload. turned once the underside of the bolt head
Stress: The load applied to a part divided or nut face contacts the work surface. This
by the cross-sectional area of the part, usually procedure is suitable for engine assembly
expressed in pounds per square inch (psi). only when the installation has been calibrated
Stress Corrosion: This is a special form of in terms of bolt stretch relative to the exact
hydrogen embrittlement in which the metal is application (the amount of compression of
attacked while under stress. Without the stress the clamped components is critical).
the crack will not move. But under stress the UHL: Means “Under Head Length.” The dis-
crack moves and corrosion takes place at the tance as measured from tip of the fastener to
freshly opened crack face. a place directly at the base of the head.
Stress Ratio: The ratio of the minimum Yield Strength: The stress at which a given
stress to the maximum stress in a structure material or component exhibits a permanent
which is subject to fluctuating loads. deformation (i.e. “takes a set”). When the load
Stress Riser: You have a notch, ding or that caused the stress is removed, the part will
some change in section size, so now the stress not return to its original dimensions. If you
at these points is increased above nominal exceed the yield strength of a fastener, the
stress. Compare this kind of stress to the flow fastener is ruined and must be replaced.
of water in a river. When the river hits a narrow
35
 FASTENER TECH
Head & Main Fastener Measurement Sheet

The illustration below shows the variables that come into play when determining the prop-
er fastener for a particular application. Some cylinder heads have different column heights
and additional variables come into play when using aftermarket engine blocks. It is therefore
critical that you determine exactly how many different bolt/hole combinations exist for the
cylinder head installation.

Name_____________________________________________ RECOMMENDED TOOLS

1) a properly calibrated caliper that will measure
Email_____________________________________________ internal and external diameters, as well as depth.
2) Some modern heads have recessed spot faces and may require extended tip
Phone/Fax__________________________________________ internal calipers for B and D.
3) an SAE or metric thread gage.
Date___________________ ARP Question #________________
HINTS
Engine Specs________________________________________ At least one head should be removed from the engine and placed on a flat surface.
Repeat to ensure accurate measurements.
Block Mfr./Model_____________________________________
All holes should be checked to determine if all are the same. Use separate copies
of this sheet as needed.
Year___________ ❏ cast iron ❏ aluminum List all inch measurements to 3 decimal places (X.XXX) and all mm measurements
to 1 decimal place (YYY.Y)
Head Mfr./Model_____________________________________
Take a photo of completed form and attach to this email
of fax completed form to 805.650.0742
Year___________ ❏ cast iron ❏ aluminum

Total Holes with Sheet _____ of _____ for this engine

Hole Count _____ these dims _____
Counterbore/Spot Face Width
Counterbore Depth

A B
use depth gauge Stud/Bolt Hole Diameter

Stud/Bolt Hole Depth

Cylinder D
C Head
or use an internal or extended tip internal
Main Cap calipers
from bottom of counterbore to bottom of head -
use depth gauge with head on a flat, solid surface Gasket Thickness

Thread Start Depth E

F measure the thickness of the gasket

Block Hole Depth

from deck to start of threads - use the depth rod to from deck to bottom of hole
measure to the top of threads

Thread Stop Depth

H
G
clean any debris from bottom of hole, use the
depth rod to extend to the bottom of the hole,
take several measurements
from deck to bottom of threads - use the depth
bar to extend to the bottom of the threads
Thread Size & Pitch

Calculated Thread Length

Engine
I
J Block use an SAE or metric thread gauge on the bolt
threads if you do not have extended thread
subtract F from G gauges

Original Are there any clearance issues around the bolt head?
Underhead Head Collar
Bolt Info (use another sheet to explain or sketch)
optional Length Height Diameter

36 ARP Head Stud Measurement Sheet - rev 07/2019

 FASTENER TECH
General Torque Recommendations

Listed here are the general torque Note 1. The torque values represented here
recommendations for most ARP fasteners. are intended for general information only and
Recommended torque is equal 75% of the bulk fasteners, not for specific installations.
fastener’s yield strength. Simply read down Note 2. On specific installations, where the
to the correct fastener size, then across supplied instructions deviate from the torque
to find the torque value for your applica- values listed here, always follow the specific
tion. ALWAYS LUBRICATE THE FASTENERS instructions packaged with each kit.
PRIOR TO APPLYING TORQUE TO ENSURE
ACCURATE READINGS.

Recommended Torque to Achieve Optimum Clamp Load

Using ARP Ultra-Torque Fastener Assembly Lubricant
Note: For those using Newton-meters as a torquing reference,
you must multiply the appropriate ft.-lbs. factor by 1.356.

Fastener Tensile Strength (PSI)

180,000 190,000 220,000

(1,241 MPa) (1,310 MPa) (1,516 MPa)

Thread Torque Torque Torque

Clamp Clamp Clamp
Major w/ARP w/ARP w/ARP
Load Load Load
Diameter lube lube lube

1/4˝ 12 3,492 14 3,967 16 4,442

5/16˝ 24 5,805 28 6,588 32 7,371

3/8˝ 45 8,622 50 9,782 55 10,942

7/16˝ 70 11,880 80 13,470 90 15,060

1/2˝ 110 16,391 125 18,515 140 20,639

9/16˝ 160 21,220 180 23,944 200 26,668

5/8˝ 210 26,372 240 29,756 270 33,140

M6 11 3,359 13 3,814 15 4,269

Thread
Major M8 24 5,801 28 6,581 32 7,361
Diameter
M10 54 9,970 62 11,305 70 12,640

M11 72 12,184 82 13,961 92 15,738

M12 98 14,472 112 16,949 125 19,425

M14 N/A N/A 184 22,771 205 25,730

M16 N/A N/A 244 29,664 272 33,519

37
 FASTENER TECH
Proper Fastener Retention

The importance of tightening fasteners to their required clamp load cannot be emphasized
enough. If a fastener is not tightened properly, the fastener will not apply the required clamp
load on the application it is being used for and may become susceptible to failure. Conversely,
if a fastener is overtightened and stretched too much, it becomes susceptible to failure by
exceeding the yield point.
There are three generally accepted methods employed to determine how much tension is
exerted on a fastener:
A. Torque
B. Stretch
C. Torque angle
Of these methods, measuring the amount of stretch of a fastener has been proven to be
the most accurate. However, since stretch can only be measured with the use of specialty type
gauges or expensive ultra-sonic measuring equipment, it is only practical for measuring the
stretch on connecting rod bolts and other fasteners, where it is possible to monitor the overall
length of a fastener, as it is being tightened. Since most fasteners are installed in blind holes
and can’t be accessed from both ends to monitor stretch, one will most likely use a torque
wrench or torque angle monitoring device for the majority of assembly work.

The Stretch Factor

It is important to note that in order for a fastener to func-
To obtain the correct
tion properly it must be stretched a specific amount. The amount of clamping
material’s ability to “rebound” like a spring is what provides force a fastener should
the clamping force. If you were to simply finger-tighten a bolt actually be stretched a
measured amount. A
there would be no clamp load. However, when you apply properly used fastener
torque or rotate a fastener a specific amount and stretch it, works like a spring!
you will be applying clamping force. The amount of clamp
load a fastener will generate depends on the thread diameter, fastener material and the mate-
rial’s mechanical properties, such as tensile strength and ductility. When a fastener is torqued or
stretched beyond its capability the fastener material will yield. The yield point or yield strength
of a fastener is the point at which the fastener has been overtightened and stretched too much,
and will not return to its original manufactured length. As a rule of thumb, if you measure a
fastener and it is .001˝ or more, longer than its original length it has been compromised and
must be replaced.
Stretch vs. Clamp Load
Clamp Load
Another factor that must be considered is (lbs)
16,000
heat! Heat, primarily in aluminum, is another
14,000
problem area. Because the thermal expansion 12,000
rate of aluminum is far greater than that of steel 10,000
it is possible to stretch a fastener beyond yield 8,000
6,000
as the aluminum expands under heat. Thermal
4,000
expansion can be offset by designing a fas- 2,000
tener that is more flexible and installing the 0
fastener at a safe percentage of yield. 0 .001˝ .002˝ .003˝ .004˝ .005˝ .006˝ .007˝ .008˝
Stretch (in.)
This graph shows the direct relationship between stretch and clamp load on a
typical 3/8˝ diameter 8740 chrome moly rod bolt.

38
 FASTENER TECH
Proper Fastener Retention

The Stretch Gauge

We highly recommend using a stretch gauge when install-
ing rod bolts and other fasteners, where it is possible to
measure the length of the fastener. It is the most accurate
way of measuring clamp load of any bolt. Simply follow
manufacturer’s instructions, or use the chart on pages 54-57
of this catalog for ARP rod bolts.
When using a stretch gauge it’s best to measure the fastener
prior to starting and monitor the fastener overall length during
installation. When the bolt has stretched the specified amount, the
correct clamping force has been achieved. We recommend that you maintain a
chart of all rod bolts and make a note of the fastener length prior to installation and after any
disassembly. If there is a permanent increase of .001˝ or more in length, there is a deformation
and the bolt should be replaced. A sample stretch monitoring chart is located on page 53.

Using A Torque Wrench

There are a number of things to consider
when using a torque wrench. The “friction fac-
tor” changes from one cycle to the next. That is,
friction is at its highest value when the fastener
is first tightened. Each subsequent time the fas-
tener is torqued and loosened, the amount of
friction reduces. Eventually the friction levels out
and becomes fairly consistent for all following
repetitions.
Three basic elements that contribute to the friction factor:
1. Most importantly - the fastener assembly lubricant
2. The condition of the threads
3. The surface finish of the fastener
Because of these variables, a phenomenon known as clamp load scatter occurs. Clamp load
scatter is the variation in clamp load a fastener generates due to fluctuating levels of friction
from one torque cycle to subsequent cycles. It’s not uncommon to see clamp load scatter in
the range of 4,000-8,000 pounds between the first and tenth pull on a new fastener depend-
ing on the lubricant used.

The Lubricant Is The Key

A major factor that influences friction in a fastener is the lubricant used, and therefore influ-
ences the torque required for a particular installation. One of the most overlooked aspects of
choosing a fastener assembly lubricant is…the lubricant’s ability to stabilize friction inherent
in all high performance engine fasteners. As discussed earlier, friction is at its highest point
when a new fastener is first tightened. This friction inhibits the fasteners ability to achieve
the required clamp load on the first several cycles. In fact, ARP’s in-house Research and
Development department has proven that new fasteners using motor oil and other commonly

39
 FASTENER TECH
Proper Fastener Retention

Installation Clamp Load Scatter Comparison

19,000
(Target Preload 18,000 lbs @ 120 ft-lbs)

ARP Ultra-Torque
18,000

17,000
Preload in lbs

16,000
EPL

15,000
Moly

14,000

Oil
13,000
1 2 3 4 5 6 7 8 9 10
Torque Cycle

used lubricants such as Moly and EPL typically require 5-7 cycles before final torquing to level
out the initial friction and achieve the required clamp load. Slicker lubricants may reduce the
required torque by as much as 20-30% to achieve the desired clamp load, but compromise
in areas of major importance such as repeatability, and may yield the fastener prematurely.
Typically, the slicker the lubricant, the greater the clamp load scatter will be during installation.
The bottom line: clamp load repeatability and consistency from a fastener to fastener
perspective, should be the number one consideration when choosing a fastener assembly
lubricant. Remember even the best fastener is only as good as its installation. Clamp load
repeatability is the foundation for maintaining round housing bores, and consistency ensures
the same clamp load from one fastener to another across a large area, such as the deck

ARP’s computer-controlled torque-tension machine can apply a given torque or torque-angle to

a fastener and measure the clamp load. Through test cycles, it is possible to chart the clamp load
scatter with various fasteners and lubricants.

surface of a cylinder block. These two fundamentals are the cornerstone of every successful
fastener installation and that’s why ARP’s engineering team set out to develop the “ultimate”
fastener lubricant. The result of several years of extensive R&D is a remarkable assembly lube
called ARP Ultra-Torque®. As shown in the graph above, ARP Ultra-Torque® clearly provides
the clamp load repeatability and consistency that no other fastener assembly lubricant on the
market today can provide.

40
 FASTENER TECH
Proper Fastener Retention

Fastener Surface Finish and Condition of Threads

In addition to the lubricant used, friction is
affected by the surface finish of the fastener itself
and the condition of the threads. For example,
black oxide behaves differently than a polished
fastener so it’s important to follow the torque rec-
ommendations with each fastener kit. Then there’s the very real problem of burrs and debris in
the bolt holes that can significantly affect the amount of torque required to achieve the recom-
mended clamp load. All bolt holes should be thoroughly cleaned using thread chasers to clean
the threads before installation. ARP offers these special cleaning chaser taps on page 172.

Torque Wrench Accuracy

It is possible for even the most expensive torque wrenches to
lose accuracy over time. Rough use or repeated loosening of
fasteners using your torque wrench as a “breaker bar” will exac-
erbate the loss of accuracy. In fact, ARP field technicians have
seen a wide range of torque wrench reading errors as much as
15-30%. This just emphasizes the importance of treating torque
wrenches with the utmost of respect and having them checked periodically for accuracy.

The Torque Angle Method

Since the amount that a bolt or nut advances on the thread per degree of rotation is deter-
mined by the thread pitch, it would appear that any amount of stretch in a given bolt or stud can
be accurately predicted by measuring the degrees of turn from the point where the underside
of the bolt head or nut face contacts the work surface. Termed the “torque angle” method, this
procedure has long been the standard of civil engineering. It has been suggested that torque
angle is a relatively simple and valid procedure to use in blind hole installations—where it is
not possible to physically measure the actual bolt stretch.
ARP has conducted extensive evaluations of the torque angle method, and concluded
that – for high performance engine applications – it is suitable only when calibrated for each
installation.
Our investigation has proven that installed stretch is dependent not only on the pitch of the
thread and the degree of rotation, but also on the amount of compression of the clamped
components, the type of lubrication, the length of the male fastener, and the amount of
engaged thread. It’s important to note that for the same degree of rotation, the amount of bolt
stretch will differ from aluminum to cast iron cylinder heads, or when installing a steel main
cap on a cast iron or aluminum block. Furthermore, each length fastener requires a unique
torque-angle to obtain the correct stretch for that fastener. The torque angle method can be
accurate – but only if each individual application has been calibrated by direct measurement
of bolt stretch. If you do employ the torque angle method, it’s best to begin calibrating rota-
tion from some small measured torque rather than the first point of contact with the work
face. To achieve optimum accuracy, always use ARP Ultra-Torque® fastener assembly lubricant
whenever possible.

41
 ROD BOLTS

Aftermarket Rod Connecting Rod Bolts

A large number of connecting rod manufacturers have chosen ARP bolts as standard equipment.
They’re proud to advertise their products as being equipped with ARP rod bolts. And for good rea-
son. The “weak link” in a connecting rod has always been the bolt, and racers know that nobody
builds a better bolt than ARP. However, it is critically important to monitor the stretch of each bolt and
replace it when it has permanently elongated by .001˝. Below you will find an extensive listing of after-
market connecting rod bolts in SAE and Metric sizing.

You should also know that ARP rod bolts are superior to those from other manufacturers – especial-
ly in the area of fatigue strength. Testing has shown ARP rod bolts to have twenty times the fatigue
strength of other bolts. As such, it makes good sense to rely on ARP for optimum connecting rod
service and reliability. Make the most of your racing budget and rely on ARP rod bolts. You’ll find the
ARP name proudly stamped on each bolt as your assurance of quality.

ARP Connecting Rod Bolt Material Overview

8740 CHROME MOLY: 8740 chrome moly is seen as a ARP3.5® (AMS5844): The high cobalt content of this alloy,
good tough steel, with adequate fatigue properties for while expensive, delivers a material with superior fatigue
most racing applications, only if the threads are rolled after characteristics and typical tensile strength in the 260,000-
heat-treatment, as is ARP’s standard procedure. Chrome 280,000 psi range. The immunity to hydrogen embrittlement
moly can be heat-treated to deliver tensile strengths be- and corrosion is a significant design consideration. This ma-
tween 180,000 and 200,000 psi. terial is primarily used in connecting rods where extremely
high loads, high RPM and endurance are important factors.
ARP2000®: ARP2000 is an steel alloy that can be safely
heat treated to a higher level than 8740. While 8740 and CUSTOM AGE 625 PLUS®: This super-alloy demonstrates
ARP2000 share similar characteristics – ARP2000 is capable superior fatigue life, tensile strength and toughness – with
of achieving a tensile strength of 220,000 psi. Stress corro- complete resistance to atmospheric corrosion and oxidation.
sion and hydrogen embrittlement are typically not a prob- ARP is the first to develop manufacturing and testing pro-
lem. cesses for fasteners with Custom Age 625+. Typical tensile
strength is 260,000-280,000 psi.
L19®: L19 is a very high strength material capable of deliv-
ering a tensile strength at 260,000 psi. L19 requires special
care to avoid hydrogen embrittlement. This material is easily
contaminated and subject to stress corrosion. It must be
kept well-oiled and not exposed to moisture.

42
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Aftermarket Connecting Rod Bolts - SAE
➏ ➎ ➋
➌
* NOTE: the Grip Length in
undercut bolts is the distance
➊ from the head to the start of
the undercut.

➐ ➍
➊ ➌ ➍ ➎ ➏ ➐
Thread ➋ Thread Grip Head Wrench Collar
Size UHL Length Length* Height Size Diameter Set Complete 2-Piece
(in.) (in.) (in.) (in.) (in.) (in.) (in.) Material Qty Set Pack
1.400 0.530 0.225 0.325 5/16 0.433 ARP3.5 8 300-6609 l 300-6629 l
1/4
1.400 0.530 0.225 0.325 5/16 0.433 Custom Age 625+ 8 300-6709 l 300-6729 l

1.500 0.550 0.150 0.348 3/8 0.526 ARP2000 8 200-6210 s 200-6220 s

5/16 1.500 0.550 0.150 0.348 3/8 0.526 ARP3.5 8 300-6608 l 300-6628 l

1.500 0.550 0.150 0.348 3/8 0.526 Custom Age 625+ 8 300-6708 l 300-6728 l

1.500 0.550 0.100 0.388 7/16 0.555 ARP2000 8 200-6207 s 200-6227 s

1.500 0.550 0.145 0.388 7/16 0.555 Custom Age 625+ 8 300-6704 l 300-6724 l

1.600 0.600 0.145 0.388 7/16 0.555 ARP2000 8 200-6209 s 200-6219 s

1.600 0.600 0.145 0.365 7/16 0.565 ARP3.5 16 300-6602 s 300-6622 s

3/8
1.600 0.600 0.145 0.365 7/16 0.565 Custom Age 625+ 16 300-6702 s 300-6722 s

1.600 0.600 0.145 0.365 7/16 0.565 ARP3.5 8 300-6603 s 300-6623 s

1.600 0.600 0.145 0.365 7/16 0.565 Custom Age 625+ 8 300-6703 s 300-6723 s

1.750 0.560 0.150 0.388 7/16 0.555 ARP2000 8 200-6208 s 200-6228 s

1.600 0.600 0.200 0.388 7/16 0.644 8740 16 200-6006 l 200-6026 l

1.725 0.650 0.300 0.380 1/2 0.655 L19 16 200-6203 l 200-6223 l

1.725 0.650 0.300 0.388 1/2 0.655 ARP2000 16 200-6205 s 200-6225 s

1.750 0.660 0.350 0.360 1/2 0.635 Custom Age 625+ 16 300-6701 l 300-6721 l

1.750 0.660 0.350 0.435 1/2 0.745 ARP3.5 16 300-6601 l 300-6621 l

1.800 1.050 0.750 0.388 7/16 0.644 8740 16 200-6001 l 200-6021 l

1.800 1.000 0.300 0.360 7/16 0.644 8740 16 200-6002 l 200-6022 l

7/16 1.800 0.700 0.200 0.388 7/16 0.644 8740 16 200-6003 l 200-6023 l

1.800 0.800 0.300 0.380 1/2 0.655 ARP2000 16 200-6202 s 200-6222 s

1.800 0.800 0.300 0.380 1/2 0.655 ARP2000 16 200-6204 s 200-6224 l

1.850 0.740 0.200 0.388 7/16 0.644 ARP2000 16 200-6201 s 200-6221 l

2.000 1.000 0.300 0.435 1/2 0.745 ARP2000 16 200-6206 l 200-6226 l

2.000 1.000 0.300 0.435 1/2 0.745 L19 16 200-6506 l 200-6526 l

2.000 1.000 0.300 0.435 1/2 0.745 Custom Age 625+ 16 300-6706 l 300-6726 l

2.000 1.250 0.750 0.388 7/16 0.644 8740 16 200-6004 l 200-6024 l

43
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Aftermarket Connecting Rod Bolts - Metric
➊ ➌ ➍ ➎ ➏ ➐
Thread ➋ Thread Grip Head Wrench Collar
Size UHL Length Length* Height Size Diameter Part #
(in.) (in.) (in.) (in.) (in.) (in.) (in.) Material (1 piece kit)
M6 X 0.75 36.8 10.2 3.8 6.6 8MM 12.4 ARP2000 301-6001
M7 X 1.0 36.8 9.9 5.1 6.4 9MM 13.3 ARP2000 301-6002
41.9 11.4 3.8 8.1 10MM 13.8 ARP2000 301-6003
M8 X 1.0 43.2 14 3.2 8.8 10MM 13.4 8740 301-6004
50.8 15.2 3.8 8.1 10MM 13.7 ARP2000 301-6005
38.1 11.4 3.2 8.1 10MM 14 ARP2000 301-6006
M8.5 X 1.0
50.8 11.4 3.2 8.1 10MM 13.4 ARP2000 301-6007
➐ ➏ 3.7 14 3.8 8.1 10MM 14.7 ARP2000 301-6008
M9 X 0.75 39.6 15.2 3.8 8.1 10MM 14.2 ARP2000 301-6009
54 14 3.8 8.4 10MM 15.2 ARP2000 301-6010
38.1 11.4 2.9 8.8 10MM 13.8 8740 301-6011

➎ 39.1 11.2 2.7 7.6 10MM 14.2 ARP2000 301-6012

43.8 13.3 5.1 8.3 10MM 15.2 ARP2000 301-6013
➍ 47 20.3 6.4 8.8 10MM 14.5 ARP2000 301-6014
M9 X 1.0 49.5 15.2 8.9 8.9 11MM 15.2 ARP2000 301-6015
49.5 15.2 5.1 8.1 10MM 14.2 CA625+ 301-6016
51.1 11.7 4.1 8.4 10MM 14.7 ARP2000 301-6017
➋
52.7 13.3 2.7 7.6 10MM 14.7 ARP2000 301-6018
54.6 19.1 3.8 8.9 11MM 15.2 ARP2000 301-6019
➌ 40.6 12.1 3.8 8.1 10MM 13.3 ARP2000 301-6020
44.2 12.7 3.8 8.1 10MM 13.3 ARP2000 301-6021
47 12.7 3.8 8.1 10MM 14.4 ARP2000 301-6022
➊ M9 X 1.25
49.5 15.2 5.1 8.1 10MM 14.2 CA625+ 301-6023
52.8 11.4 4.1 8.4 10MM 14.2 ARP2000 301-6024
* NOTE: the Grip Length in
undercut bolts is the distance 56.6 14.7 3.8 8.4 10MM 14.9 ARP2000 301-6025
from the head to the start of
the undercut. M9 X 1.75 44.5 14.6 5.1 8.9 11MM 15.2 CA625+ 301-6026
M9 X 1.85 47 13.3 5.1 8.4 11MM 14.7 ARP2000 301-6027
M9.5 X 1.0 41.4 10.4 5.1 8.4 11MM 16.6 ARP2000 301-6028
47 13.7 5.2 8 11MM 16.4 ARP2000 301-6029
M10 X 1.0
47 13.7 5.2 9.9 11MM 16.4 ARP2000 301-6030
M10 X 1.25 4.5 13.7 5.3 9.3 11MM 15.9 ARP2000 301-6031
40.6 11.4 5.1 9 12MM 16.4 ARP2000 301-6032
45.1 17.1 8.9 9.5 12MM 17.8 ARP2000 301-6033
47.2 14.2 5.3 9.3 12MM 16.5 ARP2000 301-6034
M11 X 1.25
51.3 12.7 2.4 9.4 12MM 17.8 ARP2000 301-6035
57.2 17.1 8.9 10.9 12MM 17.8 ARP2000 301-6036
58.2 16.5 8.9 10.9 12MM 18.9 ARP2000 301-6037

44
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
OEM Replacement Rod Bolts
CHOOSE FROM THREE ARP OEM REPLACEMENT ROD BOLTS:
OEM connecting rods are used in a variety of applications from rebuilt stock motors to modified pow-
erplants used in circle track, marine and drag racing engines.

ARP offers replacement rod bolts in three different models. All of them are substantially better than
the stock OEM and most aftermarket bolts.

GOOD: STANDARD HIGH PERFORMANCE BOLTS

Premium grade 8740 alloy chrome moly steel is used to manufacture
ARP High Performance connecting rod bolts. These bolts provide a ten-
sile strength in the 200,000 psi range and fatigue strength nearly five
times greater than stock rod bolts.

BETTER: WAVE-LOC® HIGH PERFORMANCE BOLTS

ARP developed the Wave-Loc shank design that features symmetrical
waves with an effective interference range of of 0.001˝ to 0.005˝ for
proper cap alignment. The waves replace the knurl on standard re-
placement bolts – eliminating the stress risers that are created when
cutting into the shank - which create potential failure points. The tensile
and fatigue strengths are the same as our regular high performance
rod bolts.

BEST: “PRO” SERIES WAVE-LOC BOLTS

For the most severe applications, in conjunction with aftermarket
I-beam rods, ARP has developed the “Pro” Series Wave-Loc bolts.
These ultra heavy-duty rod bolts are made from high strength
ARP2000. This material doubles the fatigue life of 8740 chrome moly
steel and has a tensile strength of 220,000 psi, which means it can de-
live more than 12,000 lbs. of clamping force.

TECH NOTE: ROD BOLTS

Unquestionably the most important fasteners in any engine are the connecting rod bolts, as they hold the key
to the entire rotating assembly. A broken bolt will lead to catastrophic engine failure. As you can imagine, the
most critical joint is where the connecting rod halves mate. The rod bolts must support the primary tension loads
caused by each rotation (or cycle) of the crankshaft. When the crank rotates, the big end of the connecting rod
essentially becomes oval-shaped and the rod bolts bend. As the crankshaft continues to rotate, the rod becomes
round again. With alternating tension loads and cyclic bending of the bolts, it is very important to install fasteners
that are able to exert a clamping force greater than the load imposed upon the joint (tension).
In addition to utilizing a rod bolt with sufficient strength to withstand the tremendous cyclical strains placed
upon it, it is absolutely imperative that the bolts be properly tightened. The preferred method of monitoring the
correct amount of tension is through use of a stretch gauge. This is far more accurate than using a torque wrench.
Moreover, through subsequently checking the rod bolts length at tear-downs, it is possible to determine if it has
been stressed beyond safe limits and must be replaced.

45
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
ADVANTAGES OF WAVE-LOC ROD BOLTS:
• Wave-Loc surface contacts the rod and cap for opti-
“Waves” contact bolt hole wall mum alignment and reduction of fluctuating stress – which
to provide extra support and
Threads strengthen connecting rod strengthens the rod itself!
are rolled,
not cut • Provides snug fit for all OEM connecting rods
(interference range of .001˝ to .005˝), despite
wide range of factory rod bolt hole tolerances.
• Available for most applications.
• Superior material grain flow because of patented Wave-
Loc surface design as compared to knurled bolts that have
sharp edges and “built-in” stress risers.
• Galling and scoring of the rod is virtually eliminated
“Waves” are formed into bolt, Rod cap is precisely located because there is only smooth contact and absolutely no
as opposed to cut knurls, because forward “wave” serves as
which interrupt grain flow a guide “digging.”

A B C D E F G H I J K L M N O P Q

R S T U V W X Y Z AA AB AC AD AE AF AG AH

Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

ALFA ROMEO

2.0L GTV P 126-6101 l

AMC

258 cid inline 6 D 112-6001 l

290-304-343-360 cid 11/32˝ D 114-6001 l

390 cid (1968-69) R 114-6004 l

390-401 cid (1970 & later) 3/8˝ R 114-6002 l

AUDI - SEE VOLKSWAGEN, PAGE 51

BMC/TRIUMPH/ROVER

A Series 3/8˝ J 206-6001 l 206-6021 l

A & B Series 11/32˝ C 206-6002 l

B Series (1964-68) 18GB & 18GF 3/8˝ E 206-6003 l

Bonneville 650cc motorcycle (1956-72) K 206-6009 l

K Series E 206-6007 l

1.3L & 1.5L Spitfire E 206-6004 l

2.0L GT6 & 2.5L TR6 E 206-6005 l

2.0L SOHC TR7 AB 206-6006 l

46
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

BMW

S1000RR Motorcycle E 201-6202 l

1.5L & 2.0L (M10) 4-cylinder X 201-6304 l

2.8L (M52), 3.0L (M54) inline 6 8740 E 201-6303 l

2.8L (M52), 3.0L (M54) inline 6 ARP2000 E 201-6306 l

2.3L (S14) M11 x 41mm UHL E 201-6104 l

2.5L (M50/M50TU) inline 6 M9 x 53mm UHL E 201-6301 l

2.8L (M52EURO), 3.0L (S50US) & 3.2L (S52US) E 201-6201 l
inline 6 M9 x 44mm UHL
2.8L (M52/M52TU) & 3.0L (M54) inline 6 E 201-6303 l
M9 x 47mm UHL
3.0L (S50 EURO) inline 6 M10 x 45mm UHL E 201-6102 l

3.2L (S54) inline 6 M11 x 47mm UHL E 201-6103 l

4.0L (S65) V8 M9 x 45mm UHL Custom Age E 201-6001 l 201-6021 l
625+
4.4L (M62/M62TU) V8 M9 x 53mm UHL E 201-6302 l

5.0L (S85) V10 Custom Age 625+ E 201-6002 l

BUICK

90° V6 (cap screw type) 1.500˝ UHL E 123-6001 l 123-6021 l

90° V6 (cap screw type) 1.700˝ UHL, fits Grand E 123-6002 l 123-6022 l
National
215 cid aluminum V8 D 124-6001 l

350 cid (1968-73) standard 11/32˝ N 124-6002 l

350 cid (1968-73) .015 in. oversize 11/32˝ N 124-6003 l

400-401-425-430-455 cid AE 125-6001 l

CADILLAC

4.6L Northstar E 217-6301 l

390 V8 AH 117-6001 l

472-500 cid with 12 pt nuts B 135-6003 l

CHEVROLET, SMALL BLOCK

265-283-327 cid (small journal) 11/32˝ D 134-6001 l 134-6021 l 134-6401 l 134-6411 l 234-6401 l 234-6421 l

305-307-327-350 cid (large journal) 3/8˝ B 134-6003 l 134-6023 l 134-6403 l 134-6423 l 234-6403 l 234-6423 l

350 cid PM Rod (1992-97) LT1/LT4 B 134-6005 l

383 Stroker w/ 350 rod (extra head clearance) F 134-6027 l

400 cid F 134-6002 l 134-6022 l 134-6402 l 134-6422 l 234-6402 l 234-6422 l

7/16˝ “K” rod with 12 pt nuts T 134-6004 l

47
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

Gen III/IV LS Series small block & 6.2L LT1 E 134-6006 l 134-6026 l 234-6301 l 234-6321 l
(except LS7 & LS9) “Cracked Cap Design”
Gen IV LS7 & LS9 small block (titanium rod) E 234-6302 l

CHEVROLET, BIG BLOCK

396-402-427-454 cid 3/8˝ A 135-6002 l 135-6022 l 135-6402 l 135-6422 l 235-6402 l 235-6422 l

409 cid B 134-6003 l 134-6023 l 134-6403 l 134-6423 l 234-6403 l 234-6423 l

454-502 cid 7/16˝ T 135-6001 l 135-6021 l 135-6401 l 135-6421 l 235-6401 l 235-6421 l

454-502 cid 7/16˝ with 12 pt nuts T 235-6403 l 235-6423 l

Chevy 8.1 V 235-6404 l 235-6424 l

CHEVROLET, 4 AND 6-CYLINDER

140-145-164 cid Corvair 5/16˝ D 132-6002 l 132-6022 l

194-230-250 cid inline 6 D 132-6001 l 132-6021 l

120-140 cid 4-cylinder Vega D 131-6001 l 131-6021 l

2.8L 60° V6 R 133-6002 l 133-6022 l

4.3L 90° V6 F 133-6001 l 133-6021 l

CHRYSLER

2.2L & 2.5L 4-cylinder R 141-6001 l 141-6021 l 141-6401 l

170-225 cid Slant Six F 142-6001 l

318-340-360 Wedge & 318-360 Magnum R 144-6001 l 144-6021 l 144-6401 l 144-6421 l 244-6401 l 244-6421 l

5.7L Gen III Hemi E 247-6301 l

6.1L & 6.4L Gen III Hemi E 247-6302 l

383-400-413-440 Wedge & 354-392 Hemi R 145-6002 l 145-6022 l 145-6402 l 245-6402 l 245-6422 l
426 factory Hemi & 426-472-528-572 Gen II AC 145-6001 l 145-6021 l
Hemi 7/16˝
DATSUN - SEE NISSAN, PAGE 49

DIESEL

Chevy/GM 6.6L Duramax E 230-6301 l

GMC 6.6L Duramax L5P E 230-6302 l

Cummins 3.9L (4BT) 4-cylinder E 247-6304 l

Dodge/Cummins 5.9L 12V/24V E 247-6303 l

Ford 6.0L & 6.4L Power Stroke E 250-6301 l

Ford 6.7L Power Stroke ARP2000 E 250-6304 s

Ford 7.3L Power Stroke PM rod (2001-03) E 250-6302 l

Ford 7.3L Power Stroke forged rod (1994-00) AG 250-6303 l

Nissan 2.5L (YD25) 4-cylinder diesel 11/32˝ C 202-6008 l

FORD, SMALL BLOCK

48
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

239-256-272-292 Y block (rod marked EBU) M 154-6007 l 154-6027 l

312 Y block (rod marked ECZ) revised fitment F 154-6004 l 154-6024 l

289-302 cid standard 5/16˝ AD 154-6002 l 154-6022 l 154-6402 l 154-6422 l 254-6402 l 254-6422 l

302 cid Sportsman SVO 3/8˝ M 150-6005 l 150-6025 l

351 Cleveland C 154-6003 l 154-6023 l 154-6403 l 154-6423 l 254-6403 l 254-6423 l

351-400M C 154-6001 l 154-6021 l 154-6401 l 154-6421 l

Boss 302 & 351W C 150-6004 l 150-6024 l 150-6404 l 150-6424 l 250-6404 l 250-6424 l

351W with square head rod bolt AC 154-6006 l

FORD, BIG BLOCK

390-406-410-427-428 cid FE Series G 155-6002 l 155-6022 l 255-6402 l 255-6422 l

427 LeMans E 200-6001 l 200-6021 l

428 Cobra Jet (replacement for 13/32˝ bolt) A 155-6001 l 155-6021 l

429-460 cid AC 155-6003 l 155-6023 l

Boss 429, 429 Cobra Jet/Super Cobra Jet C 150-6004 l 150-6024 l 150-6404 l 150-6424 l 250-6404 l 250-6424 l

FORD, GODZILLA

7.3L, ARP2000 258-6301 s

FORD, MODULAR

4.6L & 5.4L E 256-6301 l

FORD, 4, 5 AND 6-CYLINDER

1.6L CVH M8 E 151-6004 l

1.6L Zetec E M8 E 151-6003 l 151-6023 l

1.8L Duratec E 251-6202 l

2.0L DOHC Cosworth Sierra/Escort E 251-6301 l

2.0L RS 2000 M8 E 251-6201 l 251-6222 l

2.0L Zetec M9 E 151-6005 l

2000cc Pinto D 151-6001 l 151-6021 l

2300cc Pinto A 151-6002 l 151-6022 l 251-6402 l 251-6422 l

2.5L (B5254) DOHC 5-cylinder E 251-6203 l

2.8L & 2.9L V6 AD 153-6001 l

3.8L V6 Super Coupe T-bird C 153-6002 l 153-6022 l

240-300 cid inline 6 G 152-6001 l

4.9L inline 6 M 152-6002 l

HOLDEN

11/32˝ C 205-6002 l

3/8˝ J 205-6001 l

49
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

HONDA/ACURA

1.2L, 1.6L & 1.8L M8 F 208-6001 l

1.5L (L15) E 208-6301 l

1.6L & 1.8L M9 Y 208-6401 l

2.0L (F20C) & 2.2L (F22C) S2000 E 208-6002 l

2.0L (K20A) E 208-6003 l

3.0L (C30A) V6 Acura NSX M9 AF 208-6004 l

3.2L (C32B) V6 Acura NSX M8 AF 208-6005 l

JEEP

4.0L inline 6 D 146-6001 l

LANCIA

2.0L SOHC 8V & DOHC 16V Turbo E 275-6001 l

MAZDA

1.6L (B6) & 1.8L (BP) DOHC Miata M9 W 118-6401 l

MINI

1.6L (W10, W11) Mini – supercharged & non-su-

percharged (2002-08 Chrysler engine) M8 x E 206-6008 l
43mm UHL
1.6L (N12/N14/N16/N18) Mini – turbocharged
& non-turbocharged (2007-15 Peugeot engine) E 201-6305 l
M7 x 45mm UHL
MITSUBISHI

2.0L (4B11) DOHC (2008 & later) E 207-6002 l

2.0L (4G63) DOHC (1993 & earlier) M9 AC 107-6001 l 107-6021 l

2.0L (4G63) DOHC (1994-07) M8 S 107-6002 l 107-6022 l

2.6L (G54B) C 107-6003 l 107-6023 l

3.0L (6G72) & 3.5L (6G74) V6 C 107-6004 l 107-6024 l

NISSAN/DATSUN

A Series (A12-A12A-A13-A14-A15) F 102-6002 l

L16 Series M8 C 102-6001 l

L20 Series 4-cylinder & 2.2L (Z22) M9 C 202-6001 l

L24 Series (early) inline 6 M8 C 202-6002 l

L24 (late), L26 & L28 Series inline 6 M9 C 202-6003 l

2.0L (SR20DE/DET) 11/32˝ C 202-6005 l

2.4L (KA24DE) 11/32˝ C 102-6003 l

2.5L (YD25) 4-cylinder diesel 11/32˝ C 202-6008 l

2.6L (RB26DET/DETT) Inline 6 11/32˝ AA 202-6007 l

3.0L (VG30E/ET) SOHC V6 M9 C 202-6003 l

50
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

3.0L (VG30D/DET/DETT) DOHC V6 11/32˝ C 202-6004 l

3.5L (VQ35) DOHC V6 M8 E 202-6006 l

3.8L (VR38DETT) DOHC V6 Custom Age 625+ E 202-6101 l

OLDSMOBILE

2.3L & 2.4L Quad 4 T 181-6001 l

307-350-403-425 cid U 184-6001 l 184-6021 l

455 cid F 185-6001 l 185-6021 l

OPEL/VAUXHALL

1.4L & 1.6L 8V M8 E 109-6002 l

1.4L 16V M9 E 109-6003 l

2.0L 16V M9 E 109-6001 l 209-6003 l

PEUGEOT

205 & 306 AC 117-6101 l

PONTIAC

151 cid (Iron Duke) 4-cylinder 11/32˝ D 191-6001 l

3800 V6 (cap screw type) 1.700˝ UHL E 123-6002 l 123-6022 l

301 cid D 194-6001 l

287-317-347-370-389 cid (1955-62) R 190-6002 l 190-6022 l

326-389-400-455 cid (1963 & later) 3/8˝ F 190-6001 l 190-6021 l

455 Super Duty 7/16˝ AC 190-6003 l 190-6023 l

455 Super Duty (cap screw type) 7/16-24 E 190-6004 l

PORSCHE

RSR Ti rod H 204-6004 l

1.7L & 2.0L Type IV K 104-6006 l

2.0L 911S (1969) H 204-6003 l

911/930 Turbo & 933 M9 H 204-6005 l

911 M10 H 204-6001 l

944 Z 204-6002 l

986/987/996 & 997 (cap screw type) M9 E 204-6301 l

RENAULT

Clio (F4R) 16V M9 E 216-6301 l

R5 Turbo (Mid-Engine) E 216-6302 l

R12 Gordini/Alpine (807g) E 116-6001 l

ROVER - SEE BMC, PAGE 45

SEA-DOO

51
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Application Hi-Perf Hi-Perf HP Wave HP Wave Pro Wave Pro Wave Pro Series Pro Series
Head
Note: Please verify rod bolt head style against 8740 8740 8740 8740 ARP2000 ARP2000 ARP2000 ARP2000
Style
the photos labeled A-AH when replacing rod bolts (complete) (2-PC) (complete) (2-PC) (complete) (2-PC) (complete) (2-PC)

Rotax RXP-X255 E 168-6001 l

SUBARU

1.8L (EJ18) & 2.2L (EJ22) SOHC, 2.5L (EJ25)

S0HC/DOHC Non Turbo & 2.0L (EJ20) DOHC Q 260-6301 l
Turbo
Subaru 2.0L 4-cylinder FA20 E 260-6303 l

2.5L (EJ25) DOHC Turbo E 260-6302 l

SUZUKI

GSX 1300 Hayabusa E 271-6301 l

M16A ARP2000 C 171-6001 l

TOYOTA

1.6L (4AGE) DOHC & 1.6L (4ALC) SOHC M9 F 203-6001 l

1.6L (2TC/2TG) & 1.8L (3TC) F 203-6003 l

1.8L (2ZZGE) E 203-6301 l

2.0L (3SGTE) & 2.4L (22R) A 203-6002 l

2.0L 4-cylinder 4U-GSE E 203-6302 l

3.0L (7MGTE) inline 6 (1986-92) Supra O 203-6004 l

3.0L (2JZGE/GTE) inline 6 (1993-98) Supra E 203-6005 l

TRIUMPH - SEE BMC, PAGE 45

VOLKSWAGEN/AUDI

Audi 5-cylinder L 104-6007 l

Audi R8 4.2L V8 2007-’18 ARP2000 E 204-6304 l

Audi R8 5.2L V10 2010-’18 ARP2000 E 204-6305 l

Formula Vee (cap screw type) M9 E 104-6005 l 104-6025 l

Super Vee (cap screw type) Audi-style rod E 104-6003 l 104-6023 l

1600cc air-cooled K 104-6001 l

Air-cooled early & late 40HP and 1500cc M9 E 104-6008 l 104-6028 l

1600cc water-cooled Rabbit & Corrado G60 K 104-6002 l

1.8L & 2.0L water cooled L 104-6004 l 104-6024 l

2.0L (FSI/TFSI) DOHC 4-cylinder, M8 E 204-6302 l

2.0L (FSI/TFSI) DOHC 4-cylinder, M9 E 204-6303 l

2.7L (APB/BEL) Turbo & 2.8L (AFC/ACK/AHA/ATQ) E 204-6201 l
Non Turbo V6
2.8L & 2.9L VR6 E 204-6006 l

VAUXHALL - SEE OPEL, PAGE 50

VOLVO

2.5L (B5254) DOHC 5-cylinder E 219-6201 l

52
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
The Importance of Proper Rod Bolt Stretch/Torque

Whether measured by stretch or by torque,

properly installing a rod bolt is essential for trou-
ble-free performance. If a bolt is installed without
sufficient clamp load, every revolution of the
crankshaft will cause a separation between the
connecting rod and rod cap. This imposes addi-
tional stretch in the bolt. The stretch disappears
when the load is removed on each revolution, or
cycle. Over time, this cyclic stretching and relax-
ing can cause the bolt to fail due to fatigue, just
like a paper clip that is bent back and forth by
hand. To prevent this condition, the bolt’s clamp A rod bolt stretch gauge is one of the most important tools a serious engine builder
load must be greater than the load caused by can own. It’s valuable in properly setting up a rod for resizing, obtaining the proper
clamp load when installed. See page 172 for more information.
rotating assembly reaching top dead center.

A properly installed rod bolt remains stretched bolts, on the other hand, support the primary
by its clamp load and is not subjected to the tension loads caused by engine operation and
cyclic loads imposed on the connecting rod. A must be protected from cyclic stretching. That’s
quality bolt will stay stretched this way for years why proper tightening of connecting rod bolts is
without failing. The important thing is to prevent so important. See pages 54-57 for recommended
the bolt from failing due to fatigue by tightening stretch and torque values.
it to a load greater than the demand of the en-
Friction is a challenging problem because it var-
gine. Protect your bolts – tighten them as recom-
ies so much, and is extremely difficult to control
mended.
with most commonly known lubricants. The best
You can measure the actual stretch of rod bolts way to avoid the pitfalls of friction and the known
through use of a stretch gauge, or a micrometer variables associated with different lubricants is
for that matter. Prior to installing the rod, measure by using the stretch method. By using the stretch
the length of the bolt in an untorqued state. Write method and removing the friction variable, clamp
this length down. You can make a chart similar to load can be controlled and repeated. Each time
the one shown on this page to keep track of the a new bolt is torqued and loosened, the friction
data. When you tear the engine down for mainte- factor gets smaller. Eventually the friction levels
nance, again measure the length of each rod bolt out and becomes constant for all following repe-
– being careful to keep everything in the proper titions, making it necessary to tighten and loosen
order. If any of the rod bolts have taken a perma- a new bolt several times before final installation,
nent set and have stretched by .001˝ or longer when the stretch method cannot be used. The
you should replace the fastener IMMEDIATELY! number of cycles depends on the lubricant. Most
The stretching is a sure indicator that the bolt has lubricants require, 5-7 tightening and loosening
been compromised and taken past its yield point. cycles to level out the friction before final installa-
tion. However, with the introduction of ARP’s new
In other types of bolted joints, this careful at- Ultra-Torque fastener assembly lubricant, cycling
tention to tightening is not as important. For a new fastener before final installation becomes a
example, flywheel bolts need only be tightened “thing of the past.” See page 171 for more infor-
enough to prevent them from working loose. mation on ARP Ultra-Torque® fastener assembly
Flywheel loads are carried either by shear pins lubricant.
or by side loads in the bolts; they don’t cause
cyclic tension loads in the bolts. Connecting rod

53
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Rod Bolt Length Monitoring Chart
Engine Details

Rod #1 Rod #2 Rod #3 Rod #4

Inside Bolt Inside Bolt Inside Bolt Inside Bolt

In Out In Out In Out In Out

Outside Bolt Outside Bolt Outside Bolt` Outside Bolt

In Out In Out In Out In Out

Rod #5 Rod #6 Rod #7 Rod #8

Inside Bolt Inside Bolt Inside Bolt Inside Bolt

In Out In Out In Out In Out

Outside Bolt Outside Bolt Outside Bolt Outside Bolt

In Out In Out In Out In Out

54
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Rod Bolt Stretch & Torque Specs Using ARP Ultra-Torque

Part No. Stretch (in.) Torque Part No. Stretch (in.) Torque Part No. Stretch (in.) Torque
ft.-lbs ft.-lbs ft.-lbs

102-6001 .0060 - .0065 26 124-6002 .0040 - .0045 45 144-6001 .0060 - .0065 50

102-6002 .0050 - .0055 26 124-6003 .0040 - .0045 45 144-6401 .0060 - .0065 50

102-6003 .0060 - .0065 45 125-6001 .0055 - .0060 50 145-6001 .0070 - .0075 75

104-6001 .0055 - .0060 40 126-6101 .0075 - .0080 45 145-6002 .0060 - .0065 50

104-6002 .0065 - .0070 40 131-6001 .0055 - .0060 45 145-6402 .0060 - .0065 50

104-6003 .0075 - .0080 40 132-6001 .0055 - .0060 45 146-6001 .0065 - .0070 45

104-6004 .0085 - .0090 35 132-6002 .0050 - .0055 30 150-6004 .0060 - .0065 50

104-6005 .0050 - .0055 40 133-6001 .0060 - .0065 55 150-6005 .0060 - .0065 50

104-6006 .0055 - .0060 40 133-6002 .0060 - .0065 45 150-6404 .0060 - .0065 50

104-6007 .0085 - .0090 35 134-6001 .0055 - .0060 45 151-6001 .0060 - .0065 40

107-6001 .0055 - .0060 40 134-6002 .0050 - .0055 55 151-6002 .0060 - .0065 40

107-6002 .0060 - .0065 26 134-6003 .0055 - .0060 55 151-6003 .0050 - .0055 25

107-6003 .0065 - .0070 40 134-6004 .0075 - .0080 75 151-6004 .0055 - .0060 25

107-6004 .0065 - .0070 40 134-6005 .0060 - .0065 55 151-6005 .0045 - .0050 36

109-6001 .0055 - .0060 32 134-6006 .0055 - .0060 40 152-6001 .0060 - .0065 50

109-6002 .0050 - .0055 24 134-6027 .0060 - .0065 55 152-6002 .0060 - .0065 50

109-6003 .0050 - .0055 32 134-6401 .0055 - .0060 45 153-6001 .0060 - .0065 35

112-6001 .0060 - .0065 40 134-6402 .0050 - .0055 55 153-6002 .0060 - .0065 40

114-6001 .0060 - .0065 40 134-6403 .0055 - .0060 55 154-6001 .0060 - .0065 50

114-6002 .0070 - .0075 50 135-6001 .0060 - .0065 80 154-6002 .0060 - .0065 35

114-6004 .0060 - .0065 50 135-6002 .0055 - .0060 55 154-6003 .0060 - .0065 50

116-6001 .0045 - .0050 36 135-6003 .0060 - .0065 50 154-6004 .0050 - .0055 50

117-6001 .0060 - .0065 55 135-6401 .0060 - .0065 80 154-6005 .0060 - .0065 50

117-6101 .0070 - .0075 45 135-6402 .0055 - .0060 55 154-6006 .0060 - .0065 50

118-6401 .0060 - .0065 38 141-6001 .0060 - .0065 50 154-6401 .0060 - .0065 50

123-6001 .0060 - .0065 55 141-6401 .0060 - .0065 50 154-6402 .0060 - .0065 35

123-6002 .0065 - .0070 55 142-6001 .0055 - .0060 50 154-6403 .0060 - .0065 50

124-6001 .0050 - .0055 45 142-6002 .0060 - .0065 50 155-6001 .0060 - .0065 50

55
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Rod Bolt Stretch & Torque Specs Using ARP Ultra-Torque

Part No. Stretch (in.) Torque Part No. Stretch (in.) Torque Part No. Stretch (in.) Torque
ft.-lbs ft.-lbs ft.-lbs

155-6002 .0060 - .0065 50 200-6506 .0065 - .0070 70 203-6302 .0065 - .0070 60

155-6003 .0060 - .0065 50 201-6001 .0075 - .0080 60 204-6001 .0095 - .0100 50

168-6001 .0070 - .0075 60 201-6102 .0065 - .0070 50 204-6002 .0105 - .0110 55

171-6001 .0055-.0060 32 201-6103 .0075 - .0080 70 204-6003 .0090 - .0095 50

181-6001 .0055 - .0060 40 201-6104 .0065 - .0070 70 204-6004 .0095 - .0100 50

184-6001 .0060 - .0065 50 201-6201 .0070 - .0075 40 204-6005 .0100 - .0105 40

185-6001 .0055 - .0060 50 201-6202 .0055 - .0060 32 204-6006 .0075 - .0080 40

190-6001 .0060 - .0065 50 201-6301 .0080 - .0085 36 204-6201 .0075 - .0080 30

190-6002 .0060 - .0065 50 201-6302 .0080 - .0085 36 204-6301 .0095 - .0100 45

190-6003 .0075 - .0080 75 201-6303 .0070 - .0075 36 204-6302 .0070 - .0075 30

190-6004 .0055 - .0060 75 201-6304 .0075 - .0080 50 204-6303 .0070 - .0075 39

191-6001 .0055 - .0060 45 201-6305 .0055 - .0060 19 204-6304 .0075 - .0080 45

194-6001 .0055 - .0060 45 201-6306 .0065 - .0070 40 204-6305 .0075 - .0080 45

200-6001 .0045 - .0050 60 202-6001 .0060 - .0065 45 205-6001 .0055 - .0060 55

200-6002 .0055 - .0060 75 202-6002 .0060 - .0065 26 205-6002 .0055 - .0060 45

200-6003 .0055 - .0060 75 202-6003 .0060 - .0065 45 205-6003 .0050 - .0055 26

200-6004 .0045 - .0050 75 202-6004 .0070 - .0075 45 206-6001 .0065 - .0070 55

200-6006 .0050 - .0055 75 202-6005 .0065 - .0070 45 206-6002 .0065 - .0070 35

200-6201 .0065 - .0070 80 202-6006 .0065 - .0070 30 206-6003 .0065 - .0070 45

200-6202 .0065 - .0070 80 202-6007 .0075 - .0080 45 206-6004 .0065 - .0070 45

200-6203 .0065 - .0070 80 202-6008 .0070 - .0075 45 206-6005 .0065 - .0070 45

200-6204 .0065 - .0070 80 202-6101 .0090 - .0095 60 206-6006 .0065 - .0070 55

200-6205 .0065 - .0070 80 203-6001 .0050 - .0055 40 206-6007 .0045 - .0050 30

200-6206 .0065 - .0070 75 203-6002 .0060 - .0065 50 206-6008 .0055 - .0060 25

200-6207 .0055 - .0060 55 203-6003 .0050 - .0055 40 206-6009 .0065 - .0070 32

200-6208 .0065 - .0070 55 203-6004 .0060 - .0065 50 207-6002 .0065 - .0070 30

200-6209 .0055 - .0060 55 203-6005 .0075 - .0080 65 208-6001 .0050 - .0055 26

200-6210 .0050 - .0055 30 203-6301 .0075 - .0080 65 208-6002 .0055 - .0060 45

56
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROD BOLTS
Rod Bolt Stretch & Torque Specs Using ARP Ultra-Torque

Part No. Stretch (in.) Torque Part No. Stretch (in.) Torque
ft.-lbs ft.-lbs

208-6003 .0080 - .0085 50 250-6303 .0085 - .0090 85

208-6004 .0080 - .0085 37 250-6404 .0070 - .0075 55

208-6005 .0080 - .0085 26 251-6201 .0050 - .0055 25

208-6301 .0055 - .0060 14 251-6202 .0065 - .0070 45

208-6401 .0070 - .0075 50 251-6203 .0085 - .0090 50

209-6003 .0065 - .0070 38 251-6301 .0065 - .0070 45

216-6301 .0065 - .0070 42 251-6402 .0065 - .0070 45

216-6302 .0065 - .0070 42 254-6402 .0070 - .0075 30

217-6301 .0075 - .0080 50 254-6403 .0070 - .0075 55

219-6201 .0085 - .0090 50 255-6402 .0070 - .0075 55

230-6301 .0070 - .0075 95 256-6301 .0065 - .0070 42

230-6302 .0095 - .0010 95 260-6301 .0070 - .0075 42

234-6301 .0065 - .0070 45 260-6302 .0070 - .0075 42

234-6302 .0060 - .0065 45 260-6303 .0065 - .0070 60

234-6401 .0065 - .0070 45 271-6301 .0050 - .0055 45

234-6402 .0055 - .0060 55 275-6001 .0075 - .0080 70

234-6403 .0065 - .0070 55 300-6601 .0065 - .0070 85

235-6401 .0070 - .0075 85 300-6602 .0055 - .0060 55

235-6402 .0065 - .0070 55 300-6603 .0055 - .0060 55

235-6403 .0070 - .0075 85 300-6608 .0055 - .0060 32

235-6404 .0080 - .0085 65 300-6609 .0045 - .0050 15

244-6401 .0070 - .0075 55 300-6701 .0065 - .0070 85

245-6402 .0070 - .0075 55 300-6702 .0065 - .0070 60

247-6301 .0065 - .0070 45 300-6703 .0065 - .0070 60

247-6302 .0075 - .0080 65 300-6704 .0060 - .0065 60

247-6303 .0095 - .0100 95 300-6706 .0060 - .0065 75

250-6301 .0075 - .0080 55 300-6708 .0055 - .0060 32

250-6302 .0095 - .0100 95 300-6709 .0050 - .0055 15

57
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS

Scan this code to see the most

up-to-date fitment information for
aftermarket heads from manufacturers
like AFR, Brodix, Edelbrock, Trick Flow
and more

CYLINDER HEAD STUDS

It is for good reason that virtually every top professional engine builder relies
on ARP Pro Series head studs for their all-out competition powerplants. Simply stated, there’s not a
better stud setup on the market today.
For openers, ARP only uses premium grade 8740 alloy and a proprietary ARP2000® alloy that are
rated far superior to “aircraft” quality alloy steels. Secondly, each stud is placed vertically into spe-
cial racks and precisely heat-treated to 190,000 psi for the 8740 material and 220,000 psi for the
ARP2000® material. This procedure ensures complete heat penetration and the results are far superi-
or to those lesser quality studs from other manufacturers who just dump pieces in a basket and hope
for the best.
Following heat-treat, each stud is centerless ground to make it as close to perfectly concentric as
possible. It’s important to note that lesser quality studs are not even centerless ground – the material
is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine).
Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cyl-
inder heads literally glide into position and are perfectly aligned – something that won’t happen with
inferior quality head studs.
ARP studs are thread rolled after heat-treat, which gives them about 2000% (that’s twenty times) bet-
ter fatigue strength than those studs that are threaded prior to heat-treat. It costs a lot more to do it
this way, because it’s tough on tooling, but the results are well worth the extra effort.
You will also note that ARP offers specially undercut studs for several engines. This procedure more
equalizes the “stretch” of both studs, which makes for a more consistent clamping force – and one that
compensates for head gasket compression when the cylinder heads are installed. This helps prevent
blown head gaskets, and assures optimum engine sealing!

58
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

ACURA - SEE HONDA/ACURA, PAGE 67

AMC

258 cid inline 6, early 1970’s, 1/2˝ all same length studs 8740 112-4001 s
290-343-390 cid (1969 & earlier) 7/16” 8740 114-4001 s 114-4201 s
304-360-390-401 cid (1970 & later) 1/2” 8740 114-4002 s 114-4202 s
401 cid with Indy heads 8740 114-4203 s
AUDI - VOLKSWAGEN/AUDI, PAGE 71

BMC/TRIUMPH

A Series, 9 studs 8740 206-4201 s

A Series, 11 studs 8740 206-4204 s
A Series, 11 studs, shaved head 8740 206-4206 s
B Series 8740 206-4202 s
1.3L & 1.5L Spitfire 8740 206-4203 s
2.0L GT6 & 2.5L TR6 8740 206-4205 s
2.0L SOHC TR7 8740 206-4208 s
2.1L TR4 8740 206-4207 s
BMW

S1000RR Motorcycle CA625+ 201-4306 s

1.5L-2.0L (M10) 4-cylinder (2002 Coupe, 318i, 320i) 8740 201-4601 s
1.6L (W10, W11) Mini – supercharged & non-supercharged (2002-08 Chrysler 8740 201-4301 s
engine)
1.6L (N12/N14/N16/N18) Mini – turbocharged & non-turbocharged (2007-15 ARP2000 201-4304 s
Peugeot engine)
8740 201-4704 s
1.6L, 2.0L inline 4 (B48)
CA625+ 401-4704 s
2.3L (S14) 4-cylinder 8740 201-4605 s
2.5L (M20) SOHC inline 6 8740 201-4305 s
2.5L (M50), 3.0L (S50US) & 3.2L (S52US) inline 6 ARP2000 201-4302 s
3.0L & 3.4L (M30) SOHC inline 6 (530, 535, 635, 735) 8740 201-4602 s
3.0L (B58) inline 6 ARP2000 201-4701 s
3.0L (B58) inline 6 CA625+ 401-4701 s
3.0L inline 6 (S58) 8740 201-4705 s
3.2L (S54) inline 6 ARP2000 201-4303 s
ARP2000 201-4702 l
3.9L, 4.4L V8 (S63)
CA625+ 201-4703 l
4.0L (S65) V8 ARP2000 201-4307 s
BUICK

V6 Stage I (1977-85) 8740 123-4001 s 123-4201 s

V6 Grand National and T-Type (1986-87) 8740 123-4003 s 123-4203 s
V6 with 1986-87’ block and GN1 Champion heads 8740 223-4204 s

59
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

V6 Stage II 8740 223-4002 s 223-4202 s

V6 Stage II with Champion heads 8740 223-4203 s

215 cid 8740 124-4002 s 124-4202 s

215 cid, Rover V8 8740 124-4003 s

350 cid 8740 124-4001 s 124-4201 s

401-425 cid, nail head 8740 124-4004 s 124-4204 s

455 cid 8740 125-4001 s 125-4201 s

CATERPILLAR - SEE DIESEL, PAGE 64

CADILLAC

472-500 cid with 6 & 12 pt nuts for clearance 8740 135-4007 s

CHEVROLET, SMALL BLOCK

23° OEM cast iron and aluminum Chevrolet, Gen III Vortec/Truck; LT1 Airflow
Research, Brownfield; Brodix -8,-10,-11, Track I, Dart Sportsman and Dart II, most 8740 134-4001 s 234-4401 s 234-4301 s 234-4601 s
Edelbrock, Trick Flow & most World Products iron and aluminum heads
18° standard port 8740 234-4107 s 234-4507 s 234-4307 s 234-4707 s

18° raised port 8740 234-4108 s 234-4508 s 234-4308 s 234-4708 s

18° Bowtie heads with 3/8”raised intake #10134363/364 8740 234-4321 s 234-4721 s

18° with 3/8˝ holes 8740 234-4322 s

18° Chevy heads w/ Brodix, Rodeck aluminum block 8740 234-4710 s

7/16˝-3/8˝ stepped 8740 234-4015 s 234-4315 s

Aluminum Block with Brodix -12 & 12x heads 8740 234-4123 s

Aluminum Bowtie splayed bolt head 8740 234-4213 s

Brodix -12, and Brodix 18° 8740 234-4103 s 234-4503 s 234-4303 s 234-4703 s

Brodix -12 rollover (angle mill) 8740 234-4311 s

Brodix 18° rollover 8740 234-4310 s

Brodix -18c,-18x with 3/8” step stud 8740 234-4727 s

Brodix -18c “AP” 8740 234-4728 s

Brodix canted valve 8740 234-4312 s

Brodix-Pontiac raised port 8740 234-4106 s 234-4506 s 234-4306 s 234-4706 s

Brodix-Pontiac standard port 8740 234-4105 s 234-4505 s 234-4305 s 234-4705 s

Brodix-Rodeck aluminum block w/ -8, 10, 11, 11x, & Track 1 Brodix heads 8740 134-4301 s

Brodix-Rodeck aluminum block w/ 12x, 12RP/GB2000 heads 8740 134-4302 s

Brodix-Rodeck aluminum block w/ 23° aftermarket style heads (3/8 & 7/16 studs) 8740 134-4303 s

Brodix-Rodeck aluminum block w/ Brodix Weld-Tech Jones GB2200 heads 8740 134-4304 s

Brodix-Rodeck aluminum block w/ BD1010 & BD2000 heads 8740 134-4305 s

Brodix-Rodeck aluminum block w/ All Pro heads 8740 134-4306 s

Brodix-Rodeck aluminum block w/ 12/18° WT/Clone Brodix head 3/8 ctr bolt 8740 134-4307 s
holes
Brodix-Rodeck aluminum block w 12/18° Brodix head, 7/16˝ studs 8740 134-4308 s
60
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

Brodix-Rodeck aluminum block w/ Weld-Tech Jones GB2300 heads 8740 134-4309 s

Brodix-Rodeck aluminum block w/ 16° Brodix heads 8740 234-4726 s

Brodix-Rodeck aluminum block w/ canted valve Brodix heads 8740 234-4711 s

Bowtie Block with Pro Action 14° head 8740 234-4725 s

Bowtie cast iron and aluminum block with Brodix Weld-Tech Jones -12 & 12x 8740 234-4723 s
heads
Bowtie cast iron and aluminum block with standard Chevy heads (.950 coarse 8740 234-4320 s 234-4720 s
thread)
Carl Foltz 15° heads 8740 234-4338 s

Dart II, Brodix Track I, 23° Pro Action, Iron Eagle II, iron block 8740 234-4109 s 234-4509 s 234-4309 s 234-4709 s

Dart 13° heads 8740 234-4337 s

Dart 18° heads 8740 234-4323 s

Dart 18° heads w/ II Generation steel block 8740 234-4036 s 234-4336 s

Dart, Buick 8740 234-4102 s 234-4502 s 234-4302 s 234-4702 s

Dart w/ Oldsmobile 14° heads 8740 234-4104 s 234-4504 s 234-4304 s 234-4704 s

Dart Sportsman, .950, coarse thread 8740 134-4002 s 234-4402 s 234-4332 s 234-4602 s

Pro Action 14° heads 8740 234-4334 s

Pro Action 14° heads w/ Tall Deck block 8740 234-4335 s

Pro Action 23° heads 8740 234-4333 s 234-4433 s

SBC w/ -12 aluminum block 8740 234-4324 s

SB2 8740 234-4722 s

SB2 w/ Brodix, Rodeck aluminum block 8740 134-4310 s

SB2-2 7/16˝ block w/ 220 ksi ARP2000 234-4724 s

SB2-2 3/8˝ block w/ 220 ksi ARP2000 300-4202 s

SB2-2 3/8˝ block w/ 260 ksi CA625+ 300-4201 s

World - Motown iron block w/ standard SBC heads 8740 134-4201 s

World - Motown aluminum block w/ standard SBC heads 8740 134-4311 s

CHEVROLET, SMALL BLOCK - LS SERIES

Dart LS Next Iron Block, 15-bolt 8740 234-4349 s

Dart LS Next Iron Block, 23-bolt 8740 234-4350 s

8740 234-4110 s 234-4316 s

Gen III LS Series small block (2003 & earlier), 4 short, 16 long ARP2000 234-4344 s

CA625+ 234-4313 s
8740 234-4317 s

Gen III/IV LS Series small block (2004 & later) w/ all same length studs ARP2000 234-4345 s

CA625+ 234-4314 s

ARP2000 234-4348 s
Gen III/IV Thread Repair Stud Kit (1/2-13 bottom, 7/16-20 top)
CA625+ 434-4348 s

61
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

Gen III/IV LSX small block ARP2000 234-4319 s

LSA ARP2000 234-4346 s

201-4306
Dart LS Next iron block with 15 bolt head 7/16˝ ARP2000 s

Dart LS Next iron block with 23 bolt head 7/16˝ ARP2000 234-4341 s

RHS - aluminum block w/ RHS LS7 head ARP2000 234-4339 s

World - Warhawk aluminum block w/ standard LS heads or Warhawk 15° heads 8740 134-4701 s

World - 9.240 deck - Warhawk aluminum block w/ Warhawk 12° LS7 heads 8740 134-4702 s

World - 9.800 deck - Warhawk aluminum block w/ Warhawk 12° LS7 heads 8740 134-4703 s
CHEVROLET, SMALL BLOCK - LT SERIES

6.2L Gen V (LT1/LT4) ARP2000 without M8 corner bolts ARP2000 234-4342 s

6.2L Gen V (LT1/LT4) ARP2000 with M8 corner studs ARP2000 234-4343 s

6.2L Gen V (LT1/LT4) Custom Age 625+ with M8 corner studs CA625+ 234-4347 s
CHEVROLET, BIG BLOCK

348-409 cid 8740 135-4002 s 235-4202 s

396-402-427-454 Cast iron OEM, Mark IV w/ aluminum factory heads and early 8740 135-4001 s 235-4401 s 235-4201 s 235-4601 s
Bowtie
396-402-427-454 Cast iron OEM, Mark IV w/ Edelbrock Performer RPM or Pro Top 8740 235-4018 s 235-4518 s 235-4318 s 235-4718 s
Line heads
396-402-427-454 Cast iron OEM, Mark IV w/ Edelbrock Victor heads 8740 235-4019 s 235-4519 s 235-4319 s 235-4719 s

396-402-427-454 Cast iron OEM, Mark IV w/ Edelbrock Big Victor 12° heads 8740 235-4330 s

396-402-427-454 Cast iron OEM, Mark IV w/ Edelbrock Big Victor 24° heads 8740 235-4329 s
396-402-427-454 Cast iron OEM, Mark IV w/ World Products Merlin heads - 8 8740 235-4016 s 235-4516 s 235-4316 s 235-4716 s
long, 2 short exhaust studs
396-402-427-454 Cast iron OEM, Mark IV w/ World Products Merlin heads - 10 8740 235-4025 s 235-4525 s 235-4325 s 235-4725 s
long exhaust studs
427 ZL1 Limited Edition, block #12370850, head #12363390/392/399 8740 235-4321 s

454-502 cast iron OEM, Mark V or Mark VI w/ Brodix/Canfield heads 8740 235-4114 s 235-4514 s 235-4314 s 235-4714 s
454-502 cast iron OEM, Mark V or Mark VI crate w/ Dart, AFR or World Products 8740 235-4113 s 235-4513 s 235-4313 s 235-4713 s
Merlin heads
454-502 cast iron OEM, Mark V with Mark V heads or Edelbrock heads 8740 235-4108 s 235-4508 s 235-4308 s 235-4708 s

8.1L (496 cid) M10 ARP2000 235-4203 s

AirFlow Research 18° heads 8740 135-4008 s 135-4305 s

Bowtie 8740 235-4110 s 235-4310 s

Late Bowtie, Dart Merlin, iron and aluminum Dart 360, Edelbrock, Dart Pro 1, AFR, 8740 235-4103 s 235-4503 s 235-4303 s 235-4703 s
Profiler 24° .750 coarse thread - OEM wet deck block & Gen VI dry deck block
long exhaust studs, ONLY 8 pieces (1.000 coarse thread with nuts and washers) 8740 235-4106 s 235-4306 s
Late Bowtie, Dart Merlin, iron and aluminum Dart 360, Edelbrock, Dart Pro 1
(mfg. before 1/1/15, use 235-4118 after 1/1/15), AFR, Profiler 24° 1.000 coarse 8740 235-4117 s 235-4317 s
thread - aftermarket dry deck block
Brodix, -2, -4, 2x, 3x, Canfield, Holley, Big Duke 8740 235-4102 s 235-4502 s 235-4302 s 235-4702 s
Brodix, Sonny Leonard 4.5° Pro Stock heads or Brodix PB1200 heads, w/ cast iron 8740 235-4320 s
block

62
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

Brodix, Sonny Leonard 14.5° Pro Stock heads or Brodix PB1200 heads, w/ Brodix 8740 135-4301 s
aluminum block
Brodix, SR20 heads w/cast iron block 8740 235-4323 s
Brodix, fits BB1 OEFI, 2, 2t, 2x, 2extra, 3, 4, 4extra, 5 heads, w/ Brodix aluminum 8740 135-4302 s
block
Brodix, w/ Dart Pro 1 or 360 heads, Pro Top Line, w/ Brodix aluminum block 8740 135-4303 s

Brodix, w/ Big Duke/Big Chief/Edelbrock Victor heads, w/ Brodix aluminum block 8740 135-4304 s

Brodix, w/ Pontiac Pro Stock heads 8740 235-4107 s 235-4507 s 235-4307 s 235-4707 s

Dart Big Chief 8740 235-4112 s 235-4512 s 235-4312 s 235-4712 s

Dart Pro 1 20° heads (manufactured after January 2015) 8740 235-4118 s
1.000 coarse thread - w/ aftermarket dry deck block
Dart Pro 1 440 heads- 1.000 coarse thread w/ aftermarket dry deck block 8740 235-4324 s 235-4328 s

Edelbrock BV3 8740 135-4306 s

Oldsmobile DRCE 8740 235-4109 s 235-4509 s 235-4309 s 235-4709 s

Profiler - Hitman 12° heads 8740 235-4315 s

Symmetrical-spread port Chevy 8740 235-4104 s 235-4504 s 235-4304 s 235-4704 s

With GM aluminum block, 7/16˝ diameter 8740 135-4005 s 235-4505 s 135-4205 s 235-4705 s

With GM aluminum block, 1/2˝ diameter 8740 135-4006 s 235-4506 s 135-4206 s 235-4706 s

World - Merlin aluminum block w/ Merlin Grumpy Jenkins or Dart aluminum heads 8740 135-4207 s

World - Merlin aluminum block w/ Merlin II/III iron and aluminum heads 8740 135-4208 s

World - Merlin III block with Brodix BB3XTRA heads, ARP2000 235-4326 s
CHEVROLET, 4 AND 6-CYLINDER

GM 2.2L Ecotec 8740 231-4701 s

GMC Vega 140 8740 131-4002 s

Inline 4-cylinder (1962 & later) 8740 131-4001 s 131-4201 s

Inline 6-cylinder (1962 & later) 8740 132-4001 s 132-4201 s

2.8L 60° V6 M11 8740 233-4003 s 233-4303 s

4.3L 90° V6 8740 233-4001 s 233-4401 s 233-4301 s 233-4601 s

4.3L 90° V6 with 18° raised port 8740 233-4108 s 233-4508 s 233-4308 s 233-4708 s

4.3L 90° V6 with 18° standard port 8740 233-4107 s 233-4507 s 233-4307 s 233-4707 s

4.3L 90° V6 with Oldsmobile 14° heads 8740 233-4104 s 233-4504 s 233-4304 s 233-4704 s

4.3L 90° V6 with Pontiac raised runner 8740 233-4102 s 233-4502 s 233-4302 s 233-4702 s
CHRYSLER, SMALL BLOCK

273-318-340-360 Wedge 8740 144-4001 s 144-4201 s

318-340-360 Wedge with W2 or W-2 Econo heads 8740 144-4002 s 144-4202 s

318-340-360 Wedge with W5-W7 heads 8740 144-4003 s 144-4203 s
& 318-360 Magnum with factory or Edelbrock Magnum heads
318-340-360 Wedge with Edelbrock RPM heads 8740 144-4005 s

318-340-360 Wedge with B1-BS heads 8740 144-4004 s 144-4204 s

63
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

5.7L, 6.1L & 6.4L Gen III Hemi 8740 244-4300 s

5.7L, 6.1L & 6.4L Gen III Hemi CA625+ 244-4301 s

CHRYSLER, BIG BLOCK

383-400-413-426-440 with Edelbrock Victor heads (77919, 77929) 8740 145-4014 s 145-4301 s

383-400-413-426-440 Wedge with factory heads or Edelbrock RPM heads 8740 145-4006 s 145-4206 s

383-400-413-426-440 Wedge with Koffel B-1 or Brodix B1 MO/MC heads 8740 145-4007 s 245-4307 s

383-400-413-426-440 Wedge with Koffel BTS full or Brodix B1-BS heads 8740 145-4012 s

383-400-413-426-440 Wedge with Indy 440 heads 8740 145-4011 s 245-4311 s

331-354-392 factory Hemi & Edelbrock RPM heads 8740 145-4001 s 145-4201 s

426 factory Hemi & 426-472-528 Hemi Crate Motor 7/16˝ 8740 145-4003 s 245-4203 s

426 factory Hemi (modified for 1/2”) 8740 145-4002 s 245-4202 s

Indy Max block w/standard Hemi heads or Indy hemi heads 8740 145-4008 s
(stud kit w/inner valley bolts)
KB Hemi - inner valley studs 8740 245-4306 s

KB Hemi (short deck) 1/2˝ 8740 245-4308 s

KB Hemi (standard deck) 1/2˝ 8740 245-4005 s 245-4305 s

KB Hemi (long deck) 1/2˝ 8740 245-4309 s

KB Hemi (standard deck) 9/16˝ 8740 245-4310 s 245-4710 s

World - Hemi iron & aluminum blocks w/standard Hemi heads or Indy hemi 8740 145-4005 s
heads
World - Hemi iron & aluminum blocks - inner valley studs 8740 245-4312 s
CHRYSLER, 4 AND 6-CYLINDER

170-225 cid Slant Six 8740 142-4001 s

2.2L & 2.5L SOHC 4 cylinder M11 ARP2000 241-4501 s 241-4701 s

3.6L V6 Pentastar M12 8740 241-4702 s

CUMMINS - SEE DIESEL, BELOW

DATSUN - SEE NISSAN, PAGE 68

DIESEL

Caterpillar C15 8740 238-4201 s

Chevy GMC 6.2L M12 8740 130-4062 s

Chevy Duramax 2.8L ARP2000 230-4203 s

Chevy Duramax 6.6L (2001-2016) (LB7/LLY/LBZ/LMM) ARP2000 230-4201 s

Chevy Duramax 6.6L (2001-2016) (LB7/LLY/LBZ/LMM) CA625+ 230-4202 s

Chevy Duramax 6.6L (2017-2021) (L5P) ARP2000 230-4301 s

Chevy Duramax 6.6L (2017-2021) (L5P) CA625+ 230-4302 s

Cummins 3.9L (4BT) ARP2000 247-4206 s

Cummins 3.9L (4BT) CA625+ 247-4207 s

Dodge/Cummins ISF 2.8L ARP2000 247-4213 s

64
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

Dodge/Cummins 5.9L 12V (1989-98) ARP2000 247-4203 s

Dodge/Cummins 5.9L 12V (1989-98) CA625+ 247-4205 s

Dodge/Cummins 5.9L & 6.7L 24V (1998 & later) ARP2000 247-4202 s

Dodge/Cummins 5.9L & 6.7L 24V (1998 & later), all same length studs ARP2000 247-4208 s

Dodge/Cummins 5.9L & 6.7L 24V (1998 & later) CA625+ 247-4204 s

Cummins C8.3L 12V 1985-1990 ARP2000 247-4209 s

Cummins ISL 8.3/8.9L 12V 1990-1998 ARP2000 247-4210 s

Cummins ISL 8.9L 24V 1999-2008 ARP2000 247-4211 s

Cummins ISV5.0 ARP2000 247-4302 s

Ford 6.0L Power Stroke ARP2000 - Inner row M8 head bolts sold separately ARP2000 250-4202 s

Ford 6.0L Power Stroke - Inner row M8 head bolts 8740 250-4206 s

Ford 6.0L Power Stroke - Inner row M8 head bolts included CA625+ 250-4205 s

Ford 6.4L Power Stroke - Inner row M8 head bolts included ARP2000 250-4203 s

Ford 6.7L Power Stroke ARP2000 250-4301 s

Ford 6.7L Power Stroke CA625+ 250-4302 s

Ford 6.9L International 8740 150-4069 s

Ford 7.3L International (1988-94) ARP2000 250-4204 s

Ford 7.3L Power Stroke (1993-03) ARP2000 250-4201 s

Nissan 2.5L (YD25) 4-cylinder ARP2000 202-4306 s

Oldsmobile 5.7L , 350 cid 8740 184-4003 s

VW/Audi 1.6L & 1.9L Turbo & Non-Turbo (1982-02) ARP2000 204-4706 s
DODGE

2.0L SOHC Neon, block #4667642, head #4556737 8740 141-4203 s

2.0L DOHC Neon, block #4667642, head #4667086 8740 141-4202 s

2.4L DOHC, block #4621443/445, head #4667086 8740 141-4204 s

3.0L (6G72) DOHC V6 ARP2000 207-4205 s

Viper Gen II & III (1996-06) ARP2000 247-4201 s

Viper SRT-10, 2008-10, M11 ARP2000 247-4301 s

FORD, SMALL BLOCK

289-302, 5.0L with factory heads or AFR 185 with 7/16˝ holes 8740 154-4001 s 254-4401 s 154-4201 s 254-4701 s
289-302, 5.0L with 351 Windsor head, 7/16˝-14 cylinder block thread
M-6049-J302, SVO high port & M-6049-L302, AFR 185 with 1/2” holes 8740 154-4005 s 254-4405 s 154-4205 s 254-4705 s
Edelbrock aluminum , GT-40 style with insert “T” washer
Boss 302 (1969-70) 7/16-14 cylinder block threads 8740 154-4002 s 154-4202 s
Boss 302 (M6010) Ford Racing block with 351C iron heads - 1/2-13 cylinder 8740 154-4207 s 154-4206 s
block threads
351 Windsor with factory heads, M-6049-J302, SVO high port and M-6049-L302 8740 154-4003 s 254-4503 s 154-4203 s 254-4703 s
GT-40 style, Edelbrock aluminum and Iron Dart with 1/2-13 cylinder block threads
351 Cleveland, 351-400M 8740 154-4004 s 154-4204 s

65
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

351 SVO Yates design 8740 254-4109 s 254-4309 s

351 SVO Yates 1994 design 8740 254-4110 s 254-4310 s

351 SVO and Fontana aluminum blocks w/’94 or later Yates heads 8740 254-4102 s 254-4101 s 254-4302 s 254-4301 s

351 “R” block with C3 heads 8740 254-4111 s 254-4501 s 254-4311 s 254-4601 s

351 “R” block w/6049-N351 heads 8740 254-4112 s 254-4314 s

Std. 351 Block w/6049-N351 heads 8740 254-4113 s 254-4315 s

351 “R” block with Brodix/Neal heads or Blue Thunder heads 8740 254-4312 s

Glidden Victor SC-1 heads for Ford Windsor 8740 154-4303 s

World - Man O’War iron/aluminum block w/ standard SBF or Man O’War 18° 8740 154-4301 s
heads
World - Man O’War iron/aluminum block w/ Man O’War 10° heads 8740 154-4302 s
FORD, BIG BLOCK

390-428 FE series with factory heads or Edelbrock heads 8740 155-4001 s 155-4201 s

390-428 FE series with Blue Thunder heads 8740 155-4204 s

427 SOHC 8740 155-4002 s 155-4202 s

429-460 cid with factory heads & 429CJ SVO alum #M-6049-A429, also 8740 155-4203 s
Edelbrock, KAASE
460 SVO aluminum, M-6049-A460 & M-6049-B460, C460 (must use 12pt. nuts) 8740 255-4304 s

460 cid with Blue Thunder heads 8740 255-4301 s

460 cid with Trick Flow “Pro Stock” heads 8740 255-4305 s

6.2L Boss V8 8740 255-4306 s

FORD, COYOTE

5.0L (2011-2012) M12 ARP2000 256-4702 s

5.0L (2011-2012) M12 CA625+ 256-4304 s

5.0L (2013-2017) M11 ARP2000 256-4301 s

5.0L (2018-2019) M12 ARP2000 256-4302 s

5.0L (2018-2019) M12 CA625+ 256-4305 s

5.2L Shelby GT350 Voodoo (2015-2020) ARP2000 256-4303 s

5.2L Shelby GT350 Voodoo (2015-2020) CA625+ 456-4303 s

FORD, FLATHEAD

1938-48 (24 stud) V8 w/ Edelbrock #1125 heads - 8740 studs, polished ARP 8740 154-4101 s
Stainless acorn nuts and washers
1949-53 (24 stud) V8 w/ Edelbrock #1115 heads - 8740 studs, polished ARP 8740 154-4102 s
Stainless acorn nuts and washers
1938-48 (24 stud) V8 w/ Offenhauser heads - 8740 studs, polished ARP Stainless 8740 154-4103 s
acorn nuts, washers
1949-53 (24 stud) V8 w/ Offenhauser heads - 8740 studs, polished ARP Stainless 8740 154-4104 s
acorn nuts, washers
1936-48 (24 stud) V8 w/ factory heads - 8740 studs, polished ARP Stainless acorn 8740 154-4105 s
nuts and washers
FORD, GODZILLA

66
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

7.3L ARP2000 258-4301 s

FORD, MODULAR

4.6L & 5.4L 2V/4V 8740 156-4101 s 156-4301 s

4.6L & 5.4L 2V/4V ARP2000 256-4001 s 256-4201 s

4.6L & 5.4L 3V ARP2000 256-4002 s 256-4202 s

FORD, 4, 5 AND 6-CYLINDER

1600cc, Escort M10 8740 151-4203 s

1.6L EcoBoost ARP2000 251-4302 s

2.0L (YB) DOHC Cosworth Sierra/Escort M12 8740 251-4701 s

2.0L Zetec 8740 251-4702 s

2000cc Pinto 8740 151-4201 s

2300cc Pinto 8740 151-4202 s 151-4702 s

2.3L Duratec (2003 & later) 8740 151-4204 s

2.3L EcoBoost 8740 151-4301 s

2.3L EcoBoost CA625+ 251-4303 s

2.5L Duratec V6 8740 253-4701 s

2.7L EcoBoost 8740 153-4302 s

2.5L (B5254) DOHC 5-cylinder ARP2000 251-4703 s

3.5L EcoBoost 8740 153-4303 s

3.8L V6 Super Coupe T-bird 8740 153-4001 s 153-4203 s

4.0L SOHC V6 8740 253-3701 s

4.0L (XR6) inline 6 M12 ARP2000 252-4302 s
10/2023 changed from 0.875˝ OD washer to 0.995˝ OD cat’s paw washer *
4.0L (XR6) inline 6 M14 to 1/2” diameter step stud conversion ARP2000 252-4301 s
10/2023 changed from 0.875˝ OD washer to 1.00˝ OD washer *
4.5L SVO inline valve V6, head #M6049-H380 8740 253-4102 s 253-4302 s
Model A 201 cid, 4-cylinder - 8740 studs, polished ARP Stainless acorn nuts and 8740 151-4002 s
washers
240-300 cid inline 6 8740 152-4001 s 152-4201 s
GENERAL MOTORS

2.2L Ecotec 8740 231-4701 s

HOLDEN

Commodore V6 (7/16˝ diameter) 8740 205-4002 s

308 cid with 12 bolt head (early) carbureted (7/16˝ diameter) 8740 205-4001 s 205-4601 s
308 cid with 12 bolt head (early) carbureted (7/16˝ diameter - 1/2˝ longer than 8740 205-4602 s
stock)
308 cid with 10 bolt head (late) EFI (7/16˝ diameter) 8740 205-4201 s

308 cid with 10 bolt head (1/2˝ diameter) 8740 234-4201 s

* if your kit has the smaller OD washers, please call us at +1 800-826-3045 to receive the larger OD washers
67
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

HONDA/ACURA

1.5L (L15) SOHC 8740 208-4308 s

1.6L (B16A) 8740 208-4601 s

1.6L (D16Y) Civic 8740 208-4305 s

1.6L (D16Z-Only) M10 8740 208-4301 s

1.8L (B18A1) Non-VTEC, Acura M11 8740 208-4302 s

1.8L (B18C1) VTEC, Acura GS-R M11 8740 208-4303 s

2.0L (B20A5) 8740 208-4703 s

2.0L (B20B) with B16A head 8740 208-4306 s

2.0L (F20) S2000 8740 208-4702 s

2.0L (K20A2/A3) VTEC 8740 208-4701 s

2.2L (H22A4) VTEC 8740 208-4304 s

2.3L (H23A) VTEC 8740 208-4307 s

3.0/3.2L NSX 1990-95, 12pt ARP2000 208-4309 s

HYUNDAI

2.0L (G4KF) ARP2000 228-4301 s

JEEP

4.0L inline 6, 1/2˝ (two lengths) 8740 146-4201 s

LANCIA

2.0L 16V Delta Integrale ARP2000 275-4701 s

MAZDA

1.6L (B6) & 1.8L (BP) DOHC Miata 8740 218-4701 s

2.0L FS-DE (1998-02) 8740 218-4703 s

2.3L DOHC 16V (2003 & later) 8740 218-4702 s

2.5L (KL) Series V6 ARP2000 218-4704 s
MITSUBISHI

2.0L (4B11) DOHC (2008 & later) ARP2000 207-4206 s

2.0L (4B11) DOHC (2008 & later) CA625+ 207-4207 s

2.0L (4G63) DOHC (1993 & earlier) M12 8740 207-4201 s 207-4701 s

2.0L (4G63) DOHC (1994-07) M11 8740 207-4203 s 207-4702 s

2.0L (4G63) DOHC (1994-07) M11 CA625+ 207-4302 s

2.6L (G54B) 8740 207-4202 s

3.0L (6G72) DOHC V6 ARP2000 207-4205 s

NISSAN/DATSUN

A-12 engines 8740 202-4202 s

A-14 engines 8740 202-4203 s

L20 series, 4-cylinder 8740 202-4201 s

68
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

L24, L26, L28 series, 6-cylinder 8740 202-4206 s

1.6L (CA16DE/DET) & 1.8L (CA18DE/DET) 8740 202-4302 s 202-4702 s

2.0L (SR20DE/DET) DOHC (1991-01) M11 8740 102-4701 s

2.0L (SR20DET/RN14) DOHC Turbo (1991-94) M12 8740 202-4303 s

2.0L (RB20DE/DET) & 2.5L (RB25DE/DET) inline 6 8740 202-4301 s

2.4L (KA24DE) DOHC ARP2000 202-4304 s

2.4L (KA24E) SOHC ARP2000 202-4307 s

2.5L (YD25) 4-cylinder diesel ARP2000 202-4306 s

2.5L (RB25DE/DET) inline 6 M11 ARP2000 202-4309 s

2.6L (RB26DETT) GT-R inline 6 ARP2000 202-4207 s

2.6L (RB26DETT) GT-R inline 6 CA625+ 202-4208 s

3.0L (VG30DE/DETT) DOHC V6 8740 202-4308 s

3.0L (VQ30) & 3.5L (VQ35) DOHC V6 8740 202-4701 s

3.8L (VR38DETT) DOHC V6 CA625+ 202-4305 s

OLDSMOBILE

2.3L Quad 4 8740 281-4301 s

215 cid, aluminum heads 8740 184-4002 s 184-4202 s

403 cid 8740 184-4004 s 184-4204 s

Batton 8740 184-4005 s 184-4205 s

455 cid with factory heads or Edelbrock heads 7/16˝ 8740 185-4001 s 185-4201 s
OPEL/VAUXHALL

2.0L 16V 8740 209-4301 s 209-4701 s

2.5L V6 Opel 8740 209-4302 s 209-4702 s

POLARIS

RZR 1000 ARP2000 288-4701 s

PONTIAC

Iron Duke 4 cylinder 1/2” 8740 191-4001 s 191-4201 s

Super Duty 4 cylinder with “Iron Duke” head 8740 290-4101 s 290-4301 s

3800 supercharged V6 (L67 Regal, SC Monte Carlo, Impala) (1999 & later) 8740 193-4001 s 193-4002 s

Ram Air 2 & 455 8740 190-4201 s

Ram Air 5 8740 190-4005 s 190-4205 s

350-400-428-455 cid with D port heads (1967 & later) 8740 190-4002 s 190-4202 s
400 Ram Air 2 and 4, 455 HO and 455 Super Duty with Round port heads (1968- 8740 190-4003 s 190-4203 s
74)
400-455 cid with Edelbrock Performer & RPM heads 60579, 60599 (mfg. before 8740 190-4304 s
3/15/02) (#8556)
400-455 cid with Edelbrock Performer & RPM heads 60579, 60599 (mfg. after 8740 190-4305 s
3/15/02) (#8549)

69
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

400-455 cid with Edelbrock Performer D port heads 61579, 61599 (#8561) 8740 190-4306 s
PORSCHE

2.0L-3.8L air cooled engines - 911 & 930 Turbo - premium austenitic studs, Dilivar 204-4206 s
replacement
2.5L SOHC/DOHC water cooled engines - 944 8740 204-4211 s

3.0L DOHC water cooled engine - 944 8740 204-4301 s

3.4L water cooled engine - 911 (996) Non-Turbo 8740 204-4707 s

3.6L Turbo water cooled engine - 911 (996) Turbo 8740 204-4210 s
RENAULT

2.0L (F4R) DOHC ARP2000 216-4301 s

ROVER

K Series 8740 206-4209 s

3.5L, 3.9L & 4.2L V8 with 14 bolt heads 8740 124-4003 s

3.9L, 4.0L, 4.2L & 4.6L V8 with 10 bolt heads 8740 157-4301 s
SATURN

1.9L DOHC (1991-99) 8740 165-4202 s

1.9L SOHC (1999-02) 8740 165-4201 s

SEA-DOO

Rotax RXP-X255 8740 168-4201 s

SUBARU

EJ Series DOHC ARP2000 260-4701 s

EJ Series DOHC CA625+ 260-4704 s

EJ Series SOHC ARP2000 260-4702 s

2.0L (FA20) DOHC ARP2000 260-4301 s

SUZUKI

GSX 1300R Hayabusa with cylinder spacer (1999-05) ARP2000 271-4701 s

1.6L (M16A) DOHC ARP2000 271-4301 s

TRIUMPH - SEE BMC, PAGE 59

TOYOTA

1.5L (1NZFE) DOHC ARP2000 203-4101 s

1.6L (4AGE) 16V DOHC 8740 203-4203 s

1.6L (4AGE) 20V DOHC ARP2000 203-4304 s

1.6L (2TC) & 1.8L (3TC) 8740 203-4206 s

1.6L (1ZZFE) DOHC ARP2000 203-4703 s

8740 203-4707 s
1.6L, 2.0L inline 4 (B48)
CA625+ 403-4707 s

1.8L (2ZZGE) DOHC ARP2000 203-4302 s

70
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD STUDS
Hex Nuts 12-Point Nuts
Application Material Hex Nuts 12-Point Nuts
U/C Studs U/C Studs

2.0L (3SGTE) DOHC 8740 203-4204 s

2.0L (3SGTE) DOHC CA625+ 203-4207 s

2.0L (4U-GSE) DOHC ARP2000 203-4305 s

2.4L (2AZFE) DOHC, 2006 & earlier ARP2000 203-4303 s

2.4L (2AZFE) DOHC, 2007 & later ARP2000 203-4306 s

2.4L (22R) 8740 203-4201 s

3.0L (7MGE/GTE) inline 6 (1981-92) Supra 8740 203-4202 s 203-4701 s

3.0L (2JZGE/GTE) inline 6 (1993-98) Supra 8740 203-4205 s 203-4702 s

3.0L (2JZGE/GTE) inline 6 (1993-98) Supra CA625+ 203-4301 s

3.0L (B58) Supra ARP2000 203-4705 s

3.0L (B58) Supra CA625+ 203-4706 s

3.8L (F Series) inline 6 (1969-74) 8740 203-4001 s

5.7L 3UR-FE ARP2000 203-4704 s

VAUXHALL - SEE OPEL, PAGE 69

VOLKSWAGEN/AUDI

Audi 5 cylinder, 10 valve 8740 204-4205 s 204-4703 s

Audi 5 cylinder, 20 valve 8740 204-4207 s 204-4704 s

Audi 2.5L TFSI inline 5 (DAZA/DNWA) CA625+ 404-4708 s

Volkswagen air-cooled, single port, M8 8740 204-4303 s

Volkswagen air-cooled, dual port, M8 8740 204-4304 s

Volkswagen air-cooled, single port, M10 8740 204-4305 s

Volkswagen air-cooled, dual port, M10 8740 204-4306 s

Volkswagen air-cooled, single port, M10 (with M14 repair thread) 8740 204-4307 s

Volkswagen air-cooled, dual port, M10 (with M14 repair thread) 8740 204-4308 s

1.6L & 1.9L Turbo & Non-Turbo diesel (1982-02) ARP2000 204-4706 s

1.8L & 2.0L 8V Golf/Jetta & 1.6L Super Vee M11 8740 204-4203 s 204-4701 s

1.8L & 2.0L 16V Golf/Jetta 8740 204-4204 s 204-4702 s

1.8L DOHC 20V Turbo M10/ (without installation tool) ARP2000 204-4103 s

1.8L DOHC 20V Turbo M10 (with installation tool) ARP2000 204-4104 s

1.8L DOHC 20V Turbo M11 (without installation tool) (early AEB) ARP2000 204-4101 s

1.8L DOHC 20V Turbo M11 (with installation tool) (early AEB) ARP2000 204-4102 s

2.0L (FSI/TFSI) DOHC ARP2000 204-4302 s

2.5L 5-cylinder RS 3/TT RS ARP2000 204-4708 s

2.7L (Bi-Turbo) DOHC V6, ARP2000 204-4105 s

2.8L & 2.9L (VR6) 12 valve 8740 204-4705 s

VOLVO

2.5L (B5254) DOHC 5-cylinder ARP2000 219-4301 s

71
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS

Scan this code to see the most

up-to-date fitment information for
aftermarket heads from manufacturers
like AFR, Brodix, Edelbrock, Trick Flow
and more

CYLINDER HEAD BOLTS

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area
flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing.
All High Performance Series bolts are 180,000 psi (which is 15% stronger than Grade 8) and kits come
complete with hardened parallel-ground washers.

PROFESSIONAL SERIES
All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread roll-
ing and machining, and meet the ARP “ZERO defect – ZERO failure” quality standard. ARP Pro Series
head bolt kits are application specific and designed to deliver superior strength typically associated
with competition engines. Pro Series kits are available in standard (8740) 190,000 psi tensile strength
material and proprietary (ARP2000®) 220,000 psi tensile strength material where noted. All Pro Series
head bolts have a reduced wrenching hex or 12-point head and wide area flange to permit the use
of larger diameter valve springs and eliminate the need for valve train removal during cylinder head
retorquing. Hardened parallel-ground washers are included in each kit. Most applications have under-
cut short bolts that can help eliminate head gasket failures through providing more “stretch” to com-
pensate for the additional compression of gaskets.

72
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS
HEAD STUDS vs. BOLTS...A TECHNICAL DISCUSSION
ARP’s factory Tech Representatives are often asked secure the head, the fastener is actually being “twist-
which is better, cylinder head studs or bolts. The ed” while it’s being torqued to the proper reading.
answer, invariably, depends on the installation. On Accordingly, the bolt is reacting to two different
many street-driven vehicles, where master cylinders forces simultaneously. A stud should be installed in
and other items protrude into the engine compart- a “relaxed” mode – never crank it in tightly using a
ment, it’s probably necessary to use head bolts so that jammed nut.
the cylinder heads can be removed with the engine If everything is right, the stud should be installed
in the car. hand tight. Then, when applying torque to the nut, the
For most applications, however, studs are recom- stud will stretch only on the vertical axis. Remember, an
mended. And for good reason. Using studs will make undercut shorter stud will have a rate similar to a longer,
it much easier to assemble an engine (especially a rac- standard shank stud. This provides a more even clamp-
ing powerplant which must be serviced frequently and ing force on the head.
quickly!) with the cylinder head and gasket assured of Because the head gasket may compress, check
proper alignment. with your g ­ asket manufacturer to see if retorquing is
Studs also provide more accurate and consistent required.
torque loading. Here’s why. When you use bolts to

High Performance Pro Series Stainless

Application
Hex 12-Point Hex 12-Point Hex 12-Point

AUDI - SEE VOLKSWAGEN, PAGE 77

AMC

258 cid inline 6 with 1/2˝ bolts, all same length 112-3601 s

290-343-390 cid (1969 and earlier) 7/16˝ 114-3601 s

290-343-390 cid (1969 and earlier) with Edelbrock heads 7/16˝ 114-3605 s

304-360-390-401 cid (1970 & later) 1/2˝ 114-3602 s

304-360-390-401 cid (1970 & later) with Edelbrock heads 1/2˝ 114-3604 s

401 cid with Indy heads 114-3603 s

BUICK

V6 Stage I (1977-85) 123-3601 s 123-3701 s 223-3701 s 423-3601 l 423-3701 l

V6 Grand National and T-Type (1986-87) 123-3603 s 123-3703 s 223-3703 s

V6 with 1986-87’ block and GN1 Champion heads 223-3705 s

V6 Stage II 223-3700 s

V6 Stage II with Champion heads 223-3704 s

V6 with Duttweiler and M&A aluminum heads 123-3602 s

350 cid 120-3601 s

350 cid (black oxide inner rows, stainless steel outer row) 420-3601 s

455 cid 125-3601 s

CATERPILLAR

C15 138-3701 s

73
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS
High Performance Pro Series Stainless
Application
Hex 12-Point Hex 12-Point Hex 12-Point

CHEVROLET, SMALL BLOCK

23° Cast iron OEM, Gen III Vortec/Truck, most Edelbrock, LT-AFR, Brodix-8,-10,-11,- 134-3601 s 134-3701 s 234-3701 s 434-3601 l 434-3701 l
11xb, LT-1, Dart Pro-1, Trick Flow heads & most World Products heads
23° Cast iron OEM, Gen III Vortec/Truck, most Edelbrock, LT-AFR, Brodix-8,-10,-11,-
11xb, LT-1, Dart Pro-1, Trick Flow heads & most World Products heads (black oxide 134-3603 s 134-3703 s
inner rows, stainless steel outer row)

23° Pro Action head 134-3604 s

12-Rollover Brodix, 18° Brodix 134-3602 s 134-3702 s 234-3702 s

18° standard port 134-3607 s 234-3707 s

18° standard port with undercut bolts 234-3723 s

18° hi-port 134-3608 s 234-3708 s

18° hi-port with undercut bolts 234-3720 s

18° hi-port with 3/8˝ holes, casting #10134363 and 64 234-3721 s

18° hi-port with 3/8˝ holes, casting #10134363 and 64 with undercut bolts 234-3722 s

Bowtie with Brodix 12 - Weld-Tech, Dart II, WP Sportsman II, Brodix Track I 234-3703 s

Dart-Buick 234-3709 s

Oldsmobile 14° 234-3705 s

Pontiac Brodix aluminum heads, raised intake, -10xz RI 234-3704 s

CHEVROLET, SMALL BLOCK - LS SERIES

8740 ARP2000 Polished Inconel

(190,000 psi) (220,000 psi) (220,000 psi)
Hex 12-Point Hex 12-Point Hex 12-Point

Gen III LS Series small block (2003 & earlier), two lengths 134-3609 s 134-3709 s 234-3601 s 234-3724 s 434-3609 s 434-3709 s

Gen III LS Series small block (2004 & later - except LS9) w/ all same length bolts 134-3610 s 134-3710 s 234-3602 s 234-3725 s 434-3610 s 434-3710 s

Gen IV 6.2L (LS9) small block 130-3601 s 130-3701 s 230-3601 s 230-3701 s 430-3601 s 430-3701 s

LSA 134-3613 s 134-3713 s 234-3603 s 234-3726 s 434-3613 s 434-3713 s

World - Motown LS iron block w/ LS Series heads 134-3611 s

CHEVROLET, SMALL BLOCK - LT SERIES

Gen V 6.2L (LT1/LT4) small block ARP2000 (without M8 corner bolts) 234-3710 s

Gen V 6.2L (LT1/LT4) small block ARP2000 (with M8 corner bolts included) 234-3711 s

CHEVROLET, BIG BLOCK

348, 409, Cast iron OEM 135-3602 s

396-402-427-454 Cast iron OEM 135-3601 s 135-3701 s 235-3701 s 435-3601 l 435-3701 l

396-402-427-454 Cast iron OEM (black oxide inner rows, stainless steel outer rows) 135-3604 s 135-3704 s

74
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS
High Performance Pro Series Stainless
Application
Hex 12-Point Hex 12-Point Hex 12-Point

Mark IV with Late Bowtie aluminum, Iron Dart, Pro-1, Pro Top Line & World Products 135-3603 s 135-3703 s 235-3703 s 435-3603 l 435-3703 l
iron heads
Mark IV block with Brodix-2, -4, Canfield aluminum & World Products aluminum 135-3606 s 135-3702 s 235-3702 s 435-3606 l 435-3702 l
heads

Mark IV block with Edelbrock heads 60409, 60429, 60459, 60479, 60499, 60559 135-3610 s 135-3710 s 435-3610 l 435-3710 l

Mark IV or Mark V block with Brodix aluminum heads 135-3609 s 135-3709 s 235-3709 s

Mark IV or Mark V block with Edelbrock heads 77609, 77659, 7760, 7765 135-3611 s 135-3711 s

Mark IV or Mark V block with Edelbrock heads 77609, 77659, 7760, 7765 with 235-3711 s
undercut bolts

Mark IV or Mark V block with AFR Casting # 315/335/357 with undercut bolts 135-3712 s

Mark V with 502 heads 135-3706 s 235-3706 s

Mark V or Mark VI block with late Bowtie, Dart aluminum, AFR & World Products 135-3607 s 135-3707 s 235-3707 s
heads

Dart aluminum head exhaust bolts only, (8 pieces) 135-3605 s 135-3705 s 235-3708 s 435-3605 l 435-3705 l

Pontiac Pro Stock aluminum head, Brodix 235-3704 s

Pontiac Pro Stock aluminum head, Dart Big Chief 235-3705 s

CHEVROLET, 6-CYLINDER

90° V6 233-3701 s

90° V6 with 18° standard port 133-3607 s 233-3707 s

90° V6 with 18° hi-port 233-3708 s

90° V6 hi-port 3/8˝ holes 233-3721 s

CHRYSLER, SMALL BLOCK

273-318-340-360 Wedge 144-3602 s

318-340-360 Wedge with W-2, W-2 Econo heads or Edelbrock RPM heads 144-3601 s

318-340-360 Wedge with W-5, W-7 heads 144-3604 s

318-340-360 Wedge with RHS Pro Action 360 X heads 144-3606 s

318-360 Magnum with factory heads or Edelbrock Magnum heads 144-3605 s

5.7L, 6.1L & 6.4L Gen III Hemi 147-3901 s

CHRYSLER, BIG BLOCK

383-400-413-426-440 Wedge with factory heads or Edelbrock RPM heads 145-3606 s 145-3706 s 445-3606 l 445-3706 l
60919/929/149/189
383-400-413-426-440 Wedge with factory heads or Edelbrock RPM heads 245-3706 s
60919/929/149/189, with undercut bolts

383-400-413-426-440 Wedge with Edelbrock Victor heads 77919, 77929 145-3609 s

383-400-413-426-440 Wedge with Indy 440 heads 145-3607 s

75
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS
High Performance Pro Series Stainless
Application
Hex 12-Point Hex 12-Point Hex 12-Point

426 factory Hemi & Mopar 426-472-528 Hemi Crate Motor with factory heads or 145-3901 s
Edelbrock Hemi Victor Jr. Heads - 7/16˝

CHRYSLER, 4-CYLINDER

2.2L & 2.5L M11 ARP2000 241-3701 s

CUMMINS

ISF2.8 ARP2000 247-3701 s

FORD, 4, 5, & 6-CYLINDER

1.6L EcoBoost ARP2000 251-3702 s

2.3L EcoBoost ARP2000 251-3701 s

2.7L EcoBoost ARP2000 253-3602 s

4.5L SVO inline valve V6 253-3702 s

FORD, SMALL BLOCK

289-302 with factory heads or Edelbrock heads 60259, 60379 154-3601 s 154-3701 s 454-3601 l 454-3701 l

302 Boss 154-3602 s 154-3702 s 254-3702 s 454-3602 l 454-3702 l

302 with 351 Windsor heads 1/2˝-7/16˝ insert washer with 7/16˝ bolts 154-3605 s 154-3705 s 454-3605 l 454-3705 l

302 with 351 Windsor heads 1/2˝-7/16˝ stepped bolt 254-3708 s

351 Cleveland & 351-400M 154-3604 s 254-3704 s

351 Cleveland SVO, iron block 254-3701 s

351 Windsor with factory heads or Edelbrock heads 60259, 60379 154-3603 s

351 World Products SBF 351W 154-3607 s

351 SVO, Yates design 254-3709 s

351 SVO, Yates 1994 design 254-3710 s

351R block with C3/C3L heads 254-3711 s

FORD, BIG BLOCK

390-428 FE series with factory heads or Edelbrock heads 60069, 60079 155-3601 s

390-428 FE series with Blue Thunder heads 155-3604 l

427 SOHC 155-3602 s

429-460 cid 255-3701 s

429-460 cid with Edelbrock heads 60669, 60079, 61669, 61649 155-3603 s

HARLEY DAVIDSON MOTORCYCLE

’48-’84 All pan heads & shovel heads 460-3601 l

76
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEAD BOLTS
High Performance Pro Series Stainless
Application
Hex 12-Point Hex 12-Point Hex 12-Point

’57-early ’73 XL’s 460-3602 l

HOLDEN

308 cid with 12 bolt (early) carbureted 7/16˝ 205-3601 s

308 cid with 12 bolt (early) carbureted 7/16˝ with undercut bolts 205-3701 s

JEEP

3.8L & 4.2L (232 & 258 cid) inline 6 - 7/16˝ (all same length) 146-3602 s

3.8L & 4.2L (232 & 258 cid) inline 6 with 4.0L head - 7/16˝ (two lengths) 146-3603 s

4.0L (242 cid) inline 6 - 1/2˝ 146-3601 s

MINI

1.6L, W10/W11, (2002-08 Chrysler engine) 206-3601 s

MITSUBISHI

2.0L (4G63) DOHC (1994 & later) M11, with undercut bolts 207-3900 s

OLDSMOBILE

350-455 cid with factory heads or Edelbrock heads 60519, 60529 (1976 & earlier) 180-3600 s 180-3700 s 280-3700 s 480-3600 l 480-3700 l
7/16˝

307-350-403-455 cid (1977 & later) 1/2˝ 180-3601 s

PONTIAC

326-347-370-389-421 cid with D port heads (1964 & earlier) 190-3608 s

326-389-421 cid with D port heads (1965-66 only) 190-3602 s

350-400-428-455 cid with D port heads (1967 & later) 190-3607 s

400 Ram Air II/IV & 455 HO, Ram Air II, Super Duty with Round port heads (1968-74) 190-3601 s

400-455 cid with Edelbrock Performer & RPM heads 60579, 60599 (mfg. before 190-3604 s
3/15/02) (#8556)
400-455 cid with Edelbrock Performer & RPM heads 60579, 60599 (mfg. after 190-3605 s
3/15/02) (#8549)

400-455 cid with Edelbrock Performer D port heads 61579, 61599 (#8561) 190-3609 s

TOYOTA

1.3L (4EFE/FTE) & 1.5L (5EFE/FHE) DOHC ARP2000 203-3801 s

3.0L (7MGE/GTE) inline 6 (1981-92) Supra 203-3902 s

VOLKSWAGEN/AUDI

1.8L DOHC 20V Turbo M10, ARP2000 (without installation tool) 204-3901 l

1.8L DOHC 20V Turbo M10, ARP2000 (with installation tool) 204-3902 l

77
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN STUDS

MAIN STUDS
There are many important reasons to use ARP main stud kits, including the elimination of main cap
walk and fretting, as well as protecting the threads in your engine block. All kits come complete with
hardened parallel-ground washers and high quality nuts. Some applications have provisions for
mounting windage trays and have specially designed standoff studs with serrated lock nuts to po-
sition the windage tray and lock it securely in place. The studs are manufactured from 8740 chrome
moly steel, heat-treated in-house to 190,000 psi tensile strength, and precision J-form threads rolled
after heat-treat to create a fastener that has threads 2000% stronger than others.

STUDS vs. BOLTS

ARP recommends the use of main studs over bolts whenever possible for several key reasons.
First is the ability to obtain more accurate torque readings because studs don’t “twist” into the
block. All clamping forces are on one axis. By the same token, there is less force exerted on the
block threads, which contributes to improved block life (very critical on aluminum blocks). Finally,
there are factors of easier engine assembly and proper alignment of caps every time.

78
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN STUDS
Application 2-Bolt 4-Bolt Application 2-Bolt 4-Bolt

ACURA - SEE HONDA/ACURA, PAGE 81 Large journal with straps (F & R caps) 234-5503 s 234-5603 s

AUDI - SEE VOLKSWAGEN, PAGE 82 Large journal with straps & splayed cap bolts 234-5604 s

BMC/TRIUMPH LT-1/LT-4 with factory windage tray (1992-97) 134-5502 s

A Series 206-5401 s Small journal 134-5402 s

B Series (3 cap main) 206-5402 s Small journal with aftermarket windage tray 134-5501 s

B Series (3 cap main) 206-5402 s SB2 (including 4-bolt F & R caps) w/o windage 134-5602 s
tray
B Series (5 cap main) 206-5403 s
SBC Rocket block 184-5403 s
2.0L SOHC TR7 206-5404 s
Dart Little M with splayed cap bolts 234-5801 s
Austin Healey 6-cylinder 206-5405 s
Dart Little M with splayed cap outer studs 134-5801 s
BMW
Dart Little M w/ iron main caps & splayed cap 234-5609 s
1.5L-2.0L (M10) & 2.3L (S14) 4-cylinder 201-5001 l bolts

1.6L, 2.0L inline 4 (B48) 201-5404 s Dart SHP iron block 134-5605 s

2.5L (M50), 2.8L (M52), 3.0L (S50US) & 3.2L World - Motown iron block w/ outer bolts (for
201-5000 s 134-5603 s
(S52US) inline 6 #2, 3 & 4)

3.0L (B58) I6 201-5402 s World - Motown alum block w/ outer bolts (for
#2, 3 & 4) 134-5604 s
3.2L (S54) inline 6 201-5002 s CHEVROLET, SMALL BLOCK - LS SERIES
BUICK
Gen III/LS Series small block & GMPP LSX block 234-5608 l
V6 Stage I & II 123-5401 s Gen III/LS Series small block & GMPP LSX block 234-5611 s
CA625+
V6 Stage II without windage tray 222-5602 s

Dart LS Next iron block 134-5901 s

V6 Stage II with splayed cap bolts 322-5802 s
World Prod. - Warhawk LS alum block 134-5802 l
215 cid aluminum V8 124-5401 s
CHEVROLET, SMALL BLOCK - LT SERIES
350 cid 124-5402 s
6.2L Gen V (LT1/LT4) 2013 & later (side bolts
401 cid (nail head) 124-5404 s 234-5802 s
included)
400-430-455 cid (hex) 125-5401 s CHEVROLET, BIG BLOCK
400-430-455 cid (12 pt nuts) 125-5402 s
396-402-427-454 cid 135-5402 s 135-5601 s
CADILLAC 396-402-427-454 cid with windage tray 235-5502 s 235-5701 s
472-500 cid 135-5507 s
8.1L (496 cid) Vortec 135-5901 l
CHEVROLET, SMALL BLOCK Mark IV Aluminum block 135-5603 s
400 cid with windage tray 234-5606 s
Mark IV Bowtie with windage tray 235-5702 s
400 cid with windage tray & splayed cap bolts 234-5605 s Mark V & VI 502 135-5606 s
400 cid with windage tray & 3.0˝ outer studs 234-5607 s
Mark V & VI 502 with windage tray 235-5606 s
Large journal (hex) 134-5401 s 134-5601 s Mark V & VI Bowtie block w/ splayed cap outer 235-5602 s
studs
Large journal (12 pt nuts) 134-5403 s

Dart Big M with splayed cap bolts 235-5601 s

Large journal with aftermarket (4-6 bolt) wind- 234-5501 s 234-5601 s
age tray 3.25-3.48” stroke Dart Big M with splayed cap outer studs 235-5603 s
Large journal with aftermarket (4-6 bolt) wind- World - Merlin II & III blocks w/ outer bolts (for
234-5610 s 135-5801 s
age tray 3.50-4.00” stroke #2, 3 & 4)
Large journal with splayed cap bolts 234-5602 s World - Merlin X alum block w/ outer bolts (for
#2, 3 & 4) 135-5607 s

79
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN STUDS
Application 2-Bolt 4-Bolt Application 2-Bolt 4-Bolt

CHEVROLET, 6-CYLINDER Ford 6.0L Power Stroke 150-5801 l

235-261 cid inline 6 (1954-62) 132-5402 s Ford 6.4L Power Stroke 150-5802 l

194-230-250-292 cid inline 6 (1963 & later) 132-5401 s Ford 6.7L Power Stroke ARP2000 250-5802 s

90° V6 233-5602 s Ford 7.3L Power Stroke (1993-03) 250-5801 s

90° V6 with windage tray 233-5702 s Oldsmobile 5.7L (350 cid) 184-5402 s

90° V6 with splayed cap bolts 233-5601 s Nissan 2.5L (YD25) 4-cylinder diesel 202-5803 s
CHRYSLER DODGE

2.0L SOHC/DOHC 4-cyl Neon (block # 4667642) 141-5801 s Dodge Viper SRT-10 2008-2010 247-5501 l

2.2L & 2.5L 4-cylinder M11 141-5401 s FORD, SMALL BLOCK

170-198-225 cid Slant Six 142-5401 s 289-302 cid 154-5401 s

318-440 Wedge (hex) 140-5401 s 289-302 cid with windage tray 254-5501 s

318-440 Wedge (12 pt nuts) 140-5402 s 289-302 cid with girdle (10 studs 1/2˝ longer) 154-5408 s

318-340-360 Wedge with windage tray 240-5501 s 289-302 cid with girdle (7 studs 1/2˝ longer) 154-5410 s

5.7L, 6.1L & 6.4L Hemi with cross bolts 8740 244-5400 s 302 cid with dual or rear sump oil pan* 154-5407 s
5.7L, 6.1L & 6.4L Hemi with cross bolts 302 SVO 154-5605 s
244-5401 s
ARP2000
302 “R” block (1/2˝ dia. studs) 254-5601 s
354-392 Hemi 145-5404 s
302 Dart Iron Eagle 154-5608 s
426 factory Hemi 145-5601 s 145-5602 s
302 Dart SHP 154-5612 s
KB 426 Hemi 245-5602 s
Boss 302 with windage tray 154-5602 s
World - Hemi/ RB Wedge block 145-5603 s
M6010 Boss 302 with dual or rear sump oil 154-5610 s
CUMMINS - SEE DIESEL, BELOW pan*
DATSUN - SEE NISSAN, PAGE 81 M6010 Boss 302 with front sump oil pan 154-5611 s
DIESEL 351 Cleveland 154-5404 s 154-5604 s

Chevy Duramax 2.8L 230-5403 s 351 Windsor 154-5403 s 154-5606 s

Chevy Duramax 6.6L (LB7/LLY/L5P) 351 Windsor with windage tray 154-5503 s
230-5401 s
(2005 & earlier) ARP2000
351 Windsor with dual or rear sump oil pan* 154-5409 s
Chevy Duramax 6.6L (LBZ/LMM) (2006 & later) 230-5402 s
351 SVO with outer studs (for mains No# 2,3,4) 154-5603 s
Cummins ISL ARP2000 247-5406 s
351 SVO with outer bolts (for mains No#
Cummins ISF 2.8 ARP2000 247-5407 s 354-5604 s
1,2,3,4,5)
Cummins ISV5.0 ARP2000 247-5801 s 351 “R” block 354-5605 s

Dodge/Cummins 3.9L 4BT ARP2000 247-5404 s 351 Dart Iron Eagle 154-5607 s
Dodge/Cummins 5.9L 12V (1997 & earlier) 351 Dart SHP 154-5613 s
247-5402 s
M14
Ford Australian 7/16˝ 154-5405 s
Dodge/Cummins 5.9L 12V & 24V (late ’97-’06) 247-5401 s
2-bolt M12 Ford Australian 1/2˝ 154-5406 s
Dodge/Cummins 5.9L 24V (2004 & later) w/ fac- 247-5403 l World - Manowar iron & alum blocks w/ outer
tory block stiffener plate, 0.600˝ counter bore bolts 154-5609 s

Dodge/Cummins 6.7L (2007 & later) w/ factory FORD, BIG BLOCK

247-5405 l
girdle
390-428 cid FE series (hex nuts, 10 studs) 155-5401 s
Dodge/Cummins 6.7L (2019 & later) ARP2000 247-5408 s modification to #5 cap required

80
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN STUDS
Application 2-Bolt 4-Bolt Application 2-Bolt 4-Bolt

390-428 cid FE series (12 pt nuts, 10 studs) HOLDEN

155-5421 s
modification to #5 cap required
308 cid 205-5401 s
390-428 cid FE series (12 pt nuts, 8 studs & 2 155-5404 s
boltsfor #5 cap) - no modifications required HONDA/ACURA

429-460 cid 155-5402 s 155-5501 s CBR 1000RR motorcycle 208-5405 s

429-460 cid with Ford Motorsports windage 1.5L (L15) 108-5401 s
255-5502 s 255-5702 s
tray
1.6L (B16A) (12 pt nuts) 208-5402 s
6.2L Boss V8 256-5802 s
1.8L (B18C1) Acura 208-5403 s
FORD, COYOTE (SIDE BOLTS INCLUDED)
1.8L (B18A1/B1) Acura 208-5404 s
5.0L 156-5803 s
2.2L (H22A) & 2.3L (H23A) (12 pt nuts) 208-5401 s
FORD, GODZILLA (SIDE BOLTS INCLUDED)
NSX 3.0/3.2L 1990-2005, ARP2000, 12pt 208-5801 s
7.3L ARP2000 258-5601 s
HYUNDAI
FORD, MODULAR (SIDE BOLTS SOLD SEPARATELY)
2.0L (G4KF) ARP2000 228-5401 l
4.6L & 5.4L 2V/3V/4V without windage tray 156-5401 s 156-5802 s
JEEP
4.6L & 5.4L 3V with windage tray 156-5901 s
4.0L Inline 6 without factory main girdle 146-5401 s
4.6L 4V with windage tray 256-5701 s
LANCIA
4.6L supercharged Cobra w/ windage tray 156-5403 s
(2003-04) 2.0L 16V Delta Integrale 175-5401 s
Boss 5.0L (block# M-6010-BOSS50) 156-5404 s MAZDA
Boss 5.0L - Side bolts (block# M-6010-BOSS50) 156-5203 s 1.6L (B6) & 1.8L (BP) DOHC Miata (12 pt nuts) 218-5401 s
Side bolts - Early aluminum block M8 156-5001 l 2.3L DOHC 16V (2003 & later) 218-5402 s
Side bolts - Early cast iron block M8 156-5201 s MINI
Side bolts - Late aluminum block & 5.0L Coyote 1.6L N12, N14, N16, N18, (2008-15 Peugeot
156-5002 l 201-5401 s
M9 engine)
Side bolts - Late cast iron block M9 (except
Boss 5.0L ) 156-5202 s MITSUBISHI

FORD, 4, 5 AND 6-CYLINDER 2.0L (4B11) DOHC (2008 & later) 207-5403 l

1600cc Escort 151-5403 s 2.0L (4G63) DOHC (2007 & earlier) 207-5401 s

1.6L EcoBoost ARP2000 251-5402 s 2.6L (G54B) 207-5402 s

2.0L Zetec (1997 and earlier) 151-5406 s 3.0L (6G72) V6 (1993 & later) 207-5801 s

2.0L Zetec (1998 and later) 151-5404 s L20 Series 4-cylinder 202-5401 s
NISSAN/DATSUN
2.3L Duratec (2003 & later) 151-5405 s

2.3L EcoBoost 151-5407 s L24, L26 & L28 Series 6-cylinder 202-5406 s

2000cc Pinto 151-5401 s 2.0L (SR20DE/DET) 202-5402 s

2300cc Pinto 151-5402 s 2.4L (KA24DE) 102-5401 s

2.5L (B5254) DOHC 5-cyl (2005 & later) 2.5L (YD25) 4-cylinder diesel 202-5803 s
251-5801 s
ARP2000
2.5L (RB25DET) & 2.6L (RB26DETT) inline 6 202-5403 s
3.5L EcoBoost (M10 outer, M9 inner studs) 253-5802 s ARP2000

240-300 cid inline 6 152-5401 s 3.0L (VG30DE/DETT) DOHC V6 102-5402 s

4.0L XR6 inline 6 152-5402 l 3.5L (VQ35) DOHC V6 202-5801 s

4.5L SVO inline valve V6 253-5401 s 3.8L (VR38DETT) DOHC V6 ARP2000 202-5802 s

81
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN STUDS
Application 2-Bolt 4-Bolt Application 2-Bolt 4-Bolt

OLDSMOBILE 1.6L (M16A) DOHC ARP2000 271-5201 s

2.4L Quad 4 281-5401 s TOYOTA

350-403 cid 184-5401 s 1.5L (1NZFE) DOHC ARP2000 203-5408 s

Oldsmobile 5.7L (350 cid) 184-5402 s 1.6L (4AGE) 16V/20V DOHC 203-5403 s

455 cid 185-5401 s 1.6L, 2.0L inline 4 (B48) 203-5410 s

DRCE-iron block 285-5801 s 1.8L (2ZZGE) DOHC 203-5407 s

OPEL/VAUXHALL 2.0L (3SFE) & 2.0L (3SGTE) DOHC 203-5404 s

2.0L 16 valve 209-5401 s 2.4L (2AZFE) DOHC ARP2000 203-5401 s

2.5L V6 209-5402 s 2.4L (22R) 203-5406 s

POLARIS 3.0L (7MGTE) Supra (1986-92) w/ bolts for #3 203-5402 s
cap
RZR 1000 188-5401 s
3.0L (2JZGE/GTE) Supra (1993-98) 203-5405 s
PONTIAC
3.0L (B58) Supra ARP2000 203-5409 s
Super Duty 4 cylinder - cast block 291-5801 s
VOLKSWAGEN/AUDI
Super Duty 4 cylinder - mag block 291-5802 s
Audi 5-cylinder 204-5409 s
3800 V6 supercharged (1999 & later) (hex) 193-5401 s
1.6L & 2.0L Rabbit, Golf & Jetta 204-5402 s
3800 V6 supercharged (1999 & later) (12 pt 193-5402 s 2.0L (FSI/TFSI) DOHC ARP2000 204-5408 l
nuts)
400-455 cid 194-5401 s 194-5601 s 2.7L (Bi-Turbo) DOHC V6 ARP2000 (side bolts 204-5801 l
included)
RENAULT
2.8L & 2.9L VR6 204-5403 s
2.0L (F4R) DOHC 216-5401 l
VOLVO
ROVER
2.5L (B5254) DOHC 5-cyl (2000 & later) 219-5801 s
4.0L & 4.6L V8 with side bolts 157-5401 s ARP2000

SATURN 2.5L (B5254) DOHC 5-cyl (1999 & earlier) 219-5802 s

ARP2000
1.9L DOHC (1991-99) 165-5402 s

1.9L SOHC (1999-02) 165-5401 s

SEA-DOO

Rotax RXP-X255 168-5501 s

SUZUKI

GSX 1300R Hayabusa 271-5401 s

Engine Case Kits

Application Part No. Application Part No.

CASE HALVES STUD KIT Porsche 911-930 Turbo, 3.6L & 3.8L air cooled engines 204-5406 s

Porsche 911-930 Turbo 504-9501 l Porsche 964 204-5410 s

CRANKCASE THRU-BOLT KIT Subaru 2.0L (FA20) DOHC 260-5001 l

Porsche 911-930 Turbo, 2.0L-2.7L air cooled engines 204-5407 s Subaru 2.0L, 2.2L & 2.5L SOHC/DOHC EJ Series 260-5401 l

Porsche 911-930 Turbo, 3.0L-3.3L air cooled engines 204-5405 s Toyota 2.0L (4UGSE) 203-5002 l

82
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN BOLTS

Main Bolts
Far superior to any other main bolts available for use in competition engines, ARP main bolts are
designed to meet the exacting standards and demands of professional engine builders. Forged from
8740 chrome moly steel, all ARP main bolts feature a reduced wrenching head, large underhead radi-
us and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives
them about 2000% better fatigue strength than most main bolts that are threaded prior to heat-treat-
ing. The popular High Performance Series is rated at 180,000 psi, and is a premium replacement for
OEM fasteners. Pro Series main bolts are application-specific, rated at 190,000 psi, and designed for
use in competition engines. Hardened parallel-ground washers are included with each kit.

High Performance Pro Series

Application
2-Bolt Main 4-Bolt Main 2-Bolt Main 4-Bolt Main

BMW

S1000RR Motorcycle ARP2000 - Crankcase main bolt kit (29 pcs. with sealing wash- 201-5201 l
ers)
BUICK

V6 Stage I 123-5201 s

V6 stage II 123-5202 s

455 cid 125-5201 s

CADILLAC

331 1949-’62, hex 117-5401 s

83
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN BOLTS
High Performance Pro Series
Application
2-Bolt Main 4-Bolt Main 2-Bolt Main 4-Bolt Main

365-390 1949-62, hex 117-5001 s

CHEVROLET, SMALL BLOCK

Large journal - hex 134-5001 s 134-5202 s

Large journal - 12 pt 234-5201 s

Large journal - with 1/2” straps on front & rear caps 234-5203 s

Small journal 134-5002 s

Dart - SHP iron block 134-5204 s

World - Motown iron block 134-5203 l

CHEVROLET, BIG BLOCK

396-402-427-454 cid 135-5002 s 135-5201 s

World - Merlin II & III iron blocks 135-5202 l

CHEVROLET, 6-CYLINDER

90° V6 233-5201 s

90° V6 with 1/2˝ straps on front & rear caps 233-5203 s

CHRYSLER

273-440 Wedge, reduced head height 12pt 140-5002 s

273-440 Wedge, reduced head height hex 140-5003 s

426 Hemi with cross bolts 145-5201 s

FORD, SMALL BLOCK

289-302 cid - front or rear sump - oil pickup standoff bolt included 154-5001 s 154-5201 s

302 Dart SHP 154-5205 s

351 Windsor - front or rear sump - oil pickup standoff bolt included 154-5003 s 154-5203 s

351 Cleveland & 351-400M - front or rear sump - oil pickup standoff bolt included 154-5004 s 154-5204 s

351 Dart SHP 154-5206 s

SVO 351 cid with 3/8˝ outer bolts 254-5202 s

SVO 351 cid with 7/16˝ outer bolts 254-5203 s

FORD, BIG BLOCK

390-428 cid FE Series, 12-pt 155-5201 s

429-460 cid 155-5202 s

429-460 cid front or rear sump - oil pickup standoff bolt included 155-5203 s

FORD, 4-, 5-, 6-CYLINDER

1.6L EcoBoost 251-5002 s

2.3L EcoBoost 251-5001 s

3.5L EcoBoost/Cyclone ARP2000 253-3602 s

84
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MAIN BOLTS
High Performance Pro Series
Application
2-Bolt Main 4-Bolt Main 2-Bolt Main 4-Bolt Main

4.5L SVO inline valve V6 253-5201 s

HOLDEN

308 cid 205-5001 s

JEEP

4.0L inline 6 without factory main girdle 146-5001 s

MGB

3 cap main 206-5001 s

5 cap main 206-5002 s

MITSUBISHI

2.0L (4B11) DOHC (2008 & later) ARP2000 207-5201 l

OLDSMOBILE

350-403 cid 184-5001 s

350 cid diesel 184-5002 s

455 cid 185-5001 s

PORSCHE

3.4L Non-Turbo water cooled engine - 911 (996) 204-5001 l

ROVER

4.0L & 4.6L with cross bolts 157-5001 s

SUBARU

2.0L (FA20) DOHC - Crankcase thru bolt kit 260-5001 l

2.0L, 2.2L & 2.5L SOHC/DOHC EJ Series - Crankcase thru bolt kit 260-5401 s

TOYOTA

1.6L (4AGE) 16V/20V DOHC 203-5001 l

2.0L (4UGSE) - Crankcase thru bolt kit 203-5002 l

85
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROCKER ARM STUDS

IMPORTANT TECH NOTE

It is highly advisable to determine what the optimum rocker arm
stud length is for your particular application. This is especially true
when “long” pushrods and valves are employed - you should raise
the “installed height” of the rocker arm to compensate for the lon-

Rocker Arm Studs

ger -than-stock components.

If you have ever installed a rocker stud into a cyl-

inder head and watched it wobble as it screwed
in – you knew from the beginning that the rocker
geometry was going to be inconsistent all over E D
the place. ARP rocker studs are concentric NOTE: To verify the application
within .005 T.I.R. thread pitch to thread pitch. and part number, please review
They run-in straight and true. Lengths are ex- the various dimensions:
act – designed to provide positive seating every B
time. An extra-large radius base offers greater
B) overall stud height
resistance to flex. Available in both High Perfor-
mance and Pro Series models. NOTE: Not to be C) screw-in thread depth
used with OEM-style, self-locking nuts. To be D) adjuster thread depth
used with ARP’s patented Perma-Loc® adjusters E) shank diameter and thread
(see page 88). F) base diameter and thread. F C

86
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROCKER ARM STUDS
High Performance

Application B C D E F Full Set 2-Pack Pro Series

3/8˝ typical small block application ➌ 1.750 0.700 0.800 3/8-24 7/16-14 134-7101 l 134-7121 l 234-7201 l
3/8˝ with roller rockers ➌ 1.895 0.710 1.000 3/8-24 7/16-14 134-7104 l 134-7124 l

7/16˝ typical small block application 1.770 0.700 0.670 7/16-20 7/16-14 134-7103 l 134-7123 l 234-7202 l
Aluminum heads, intake studs only, 8 pieces ➊ 2.000 0.820 0.700 7/16-20 7/16-14 235-7204 l
1.3,
Dart aluminum, 16 pieces ➊ 2.000 0.700 7/16-20 7/16-14 235-7205 l
0.820
Aluminum heads, exhaust studs only, 8 pcs. ➊ 2.000 1.650 0.700 7/16-20 7/16-14 235-7203 l

Mark V 1.900 0.750 1.000 7/16-20 3/8-16 135-7102 l 135-7122 l

With roller rockers and stud girdle ➊ 2.100 0.750 0.800 7/16-20 7/16-14 334-7203 l

With roller rockers and stud girdle 2.000 0.750 0.800 7/16-20 7/16-14 334-7204 l
With roller rockers and stud girdle ➊ 2.100 0.850 0.800 7/16-20 7/16-14 334-7202 l

With roller rockers and stud girdle 1.900 0.860 0.830 7/16-20 7/16-14 234-7205 l
With roller rockers and stud girdle ➌ 1.900 0.660 0.830 7/16-20 7/16-14 334-7201 l
7/16˝ typical small block application ➍ 1.900 0.750 0.850 7/16-20 7/16-14 200-7202 l
7/16˝ typical big block application ➊ 1.750 0.800 0.850 7/16-20 7/16-14 135-7101 l 135-7121 l 235-7201 l

With roller rockers and stud girdle 1.900 0.850 0.850 7/16-20 7/16-14 234-7206 l

Chevrolet big block (aluminum heads) 2.350 0.850 0.850 7/16-20 7/16-14 135-7202 l 135-7222 l

With roller rockers and girdles 1.900 0.750 1.000 7/16-20 7/16-14 100-7101 l 100-7121 l 200-7201 l
Typical Ford small block ➎ 1.900 0.750 1.000 7/16-20 7/16-14 100-7101 l 100-7121 l 200-7201 l
1.3,
Dart aluminum heads, 16 pieces 2.000 1.000 7/16-20 7/16-14 235-7202 l
0.820
Aluminum heads, exhaust studs only, 8 pieces 2.000 1.650 1.000 7/16-20 7/16-14 235-7206 l

Aluminum heads, intake, 8 pieces 2.000 0.820 1.000 7/16-20 7/16-14 235-7207 l

7/16˝ with 1/2˝ coarse, Pontiac (1964 & later) 2.000 1.025 1.050 7/16-20 1/2-13 290-7201 l

SVO 351 cid, with roller rockers and girdle 2.700 0.850 1.300 7/16-20 7/16-14 354-7204 l

SVO 351 cid, with roller rockers and girdle 2.800 0.800 1.500 7/16-20 7/16-14 354-7203 l

SVO 351 cid, with roller rockers and girdle 3.000 0.660 1.930 7/16-20 7/16-14 354-7202 l

SVO 351 cid, with roller rockers and girdle 3.000 0.950 1.750 7/16-20 7/16-14 254-7201 l

Chevrolet late model Vortec 1.750 0.600 0.850 3/8-24 M8 x 1.25 134-7201 l 134-7221 l

GM 4.3L Vortec V6 1.595 0.800 0.580 3/8-24 M10 x 1.50 100-7201 l 100-7221 l

Chevrolet big block 496 cid (8100 series) 1.750 0.750 0.600 7/16-20 M10 x 1.50 135-7201 l 135-7221 l
SBC GEN III/IV LS Series (non adjustable), excluding
LS7 1.460 1.100 0.500 5/16-24 M8 x 1.25 234-7207 l

SBC GEN V 6.2L (LT1/LT4) 1.000 1.100 0.500 5/16-24 M8 x 1.25 234-7208 l

Chrysler 318-360 Magnum (non adjustable) 1.425 0.625 0.600 5/16-24 5/16-18 144-7201 s

➊ These parts have a shank portion under hex to locate guide plate. ➍ Fits most stock BBChevy with 7/16 screw-in studs
➋ Fits most stock SBChevy with 3/8 screw-in studs ➎ Fits most SBFord with 7/16 screw-in studs
➌ Fits most stock SBChevy with 7/16 screw-in studs ➏ Fits most SBFord with 3/8 screw-in studs
87
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROCKER ARM ADJUSTERS

Perma-Loc Rocker Arm Adjusters®

• Exclusive 12-point head • 190,000 psi tensile strength • Doesn’t require special tools

• Heat-treated premium grade A • Precision machined threads

8740 chrome moly steel
• Locking set screw ground flush
• Patented design with rocker arm stud

One of the more aggravating things found in many high performance engines is constantly having
to re-adjust rocker arms. Until ARP introduced the patented Perma-Loc adjuster, there wasn’t a “poly
lock” on the market that you didn’t have to continually tighten.

There are several important reasons why ARP’s exclusive Perma-Loc rocker arm adjusters won’t loosen
like others. First, the adjuster body is heat-treated all the way through (not just case hardened). This
eliminates the thread “movement” common to others. Secondly, the threads are machined exactly
perpendicular to the bottom of the adjuster, so it seats evenly and applies pressure on a full 360˚
circle. Lastly, the set screw is machined flush on the bottom (not pointed) so it will have optimum con-
tact on the rocker arm stud.

You’ll find ARP Perma-Loc’s easy to use, too. The compact 12-point head is designed to hold your
wrench in position while you lock the set screw with an Allen wrench.

All in all, they’re the best you can buy

88
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ROCKER ARM ADJUSTERS
Perma-Loc® Rocker Arm Adjusters

PERMA-LOC® SPECIAL FEATURES:

12-point head with special shouldered “stop” to CUT-AWAY VIEW Threads are precision CNC-machined exactly
hold wrench. Eliminates need for special adjust- perpendicular to the bottom of adjuster to
ing tools. ensure an optimum seat and even pressure.

Forged in-house from 8740 alloy chrome moly

steel and heat-treated throughout Set screw has flush-machined tip for optimum contact
(not simply case hardened, as others are). and seating on stud.

Bottom machined Threads machined for maximum engagement.

perpendicular to threads.
Patent
#5,323,741

D
Because there are many different style rocker arms made by
C each manufacturer, we suggest that you verify the physical
dimensions and thread requirements prior to ordering. If you
have any questions, call ARP’s tech staff toll-free for details.
B
A

Application Length (A) Thread Size Body Length (B) Shank Size (C) Body Dia (D) 16pc Pack

Stamped steel rocker 1.200 3/8-24 n/a 0.620 n/a 300-8241 l

Stamped steel rocker 1.200 7/16-20 n/a 0.640 n/a 300-8242 l

Aluminum rocker 1.200 3/8-24 n/a 0.550 n/a 300-8243 l

Aluminum rocker 1.200 3/8-24 n/a 0.600 n/a 300-8244 l

Aluminum rocker 1.200 7/16-20 n/a 0.550 n/a 300-8245 l

Aluminum rocker 1.200 7/16-20 n/a 0.600 n/a 300-8246 l

Stud girdle 2.050 7/16-20 1.200 0.560 0.750 300-8247 l

Stud girdle 2.615 7/16-20 1.735 0.560 0.750 300-8248 l

Big block with girdle 2.050/2.615 7/16-20 1.200/1.735 0.560 0.750 300-8249 l

Rocker Pedestal Stud Kit

Application Part No.

Dodge Cummins 24V, 12pt 247-7201 l

89
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 VALVE COVER

Valve Cover Bolts & Studs

To ensure proper sealing of valve covers, ARP manufactures a variety of special application-specific
bolt and stud kits. Many professional engine builders prefer to use studs because of their ability to
properly position the gasket and guide the cover into position. ARP offers studs and bolts in a choice
of chrome moly steel with a black oxide finish or polished ARP Stainless. You have a choice between
conventional hex head bolts and nuts or compact, 12-point designs. The nuts feature a wide base for
better load distribution and sealing, while the compact head is easily accessed. Stud kits come com-
plete with nuts and washers, while bolt kits are shipped with the required flat washers.

Application
STUD OAL
STUD KITS BOLT KITS
NOTE: Black Oxide Stainless Black Oxide Stainless
Bolts have washers.
Qty Size BOLT UHL Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point

CHRYSLER

KB Hemi 20 1/4-20 2.450 245-7601 l

30mm
5.7L & 6.1L Hemi 20 M6 x 1.0 (1.181 140-7502 s 140-7501 s 440-7502 l 440-7501 l
in.)
HYUNDAI

45mm
G4KF 2.0L 18 M6 x 1.0 (1.772 428-7501 l
in.)
CAST ALUMINUM COVERS

Bolt kit 8 1/4-20 0.812 100-7507 s 100-7503 l 400-7507 l 400-7503 l

Bolt kit 14 1/4-20 0.812 100-7504 s 100-7508 l 400-7508 l 400-7504 l

Chevy SB2 w/ nyloc nuts 16 1/4-20 1.800 434-7609 l

Stud kit 8 1/4-20 1.500 200-7603 l 200-7613 l 400-7603 l 400-7613 l

Stud kit 12 1/4-20 1.500 200-7610 l 200-7620 l 400-7606 l 400-7616 l

90
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 VALVE COVER
Valve Cover Bolts & Studs
Application
STUD OAL
STUD KITS BOLT KITS
NOTE: Black Oxide Stainless Black Oxide Stainless
Bolts have washers.
Qty Size BOLT UHL Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point

Stud kit 14 1/4-20 1.500 200-7604 l 200-7614 l 400-7604 l 400-7614 l

Stud kit 16 1/4-20 1.500 200-7605 l 200-7615 l 400-7605 l 400-7615 l

Stud kit, Dart, Brodix, B&B 8 1/4-20 3.500 200-7606 l 200-7616 l

Stud kit, Dart, Brodix, B&B 14 1/4-20 3.500 200-7607 l 200-7617 l

Stud kit, Dart, Brodix, B&B 16 1/4-20 3.500 200-7608 l 200-7618 l

1.500
Stud kit, BB Chevy 14 1/4-20 200-7619 l
4.500
Bolt kit, Brodix head, SB 4 1/4-20 4.000 100-7511 s 100-7514 l 400-7511 l 400-7514 l

Bolt kit, Brodix head, SB 4 1/4-20 4.250 100-7512 s 100-7515 l 400-7512 l 400-7515 l

Bolt kit, Brodix head, SB 4 1/4-20 4.500 100-7513 s 100-7516 l 400-7513 l 400-7516 l

Bolt kit, Brodix head, BB 7 1/4-20 4.000 100-7517 s 100-7520 l 400-7523 l 400-7526 l

Bolt kit, Brodix head, BB 7 1/4-20 4.250 100-7518 s 100-7521 l 400-7524 l 400-7527 l

Bolt kit, Brodix head, BB 7 1/4-20 4.500 100-7519 s 100-7522 l 400-7525 l 400-7528 l
Chevy, Gen III/IV LS Series M6 x
8 2.755 100-7524 s 100-7523 s 400-7529 l 400-7530 l
small block (.165 thick washer) 1.0
Chevy, Gen III/IV LS Series M6 x 80mm
small block with 0.375˝ 8 134-7503 s 134-7504 s 434-7503 l 434-7504 l
1.0 (3.150 in.)
spacer
Chevy, Gen III/IV LS Series M6 x 90mm
small block with 0.750˝ 8 134-7505 s 134-7506 s 434-7505 l 434-7506 l
1.0 (3.543 in.)
spacer
M6 x 30mm
Chevy GEN V 6.2L (LT1/LT4) 20 134-7502 s 134-7501 s 434-7502 l 434-7501 l
1.0 (1.181 in.)
20mm
M6 x 30mm
Chevy Duramax 6.6L (LB7) 46 100-7532 s 100-7531 s 400-7532 l 400-7531 l
1.0 (.787/1.181
in.)
25mm,
30mm
Chevy Duramax 6.6L M6 x 45mm
52 100-7534 s 100-7533 s 400-7534 l 400-7533 l
(LLY/LBZ.LMM/LML) 1.0 (0.984,
1.181,
1.772 in.)
1.000
Ford Racing M-6582-Z351 16 1/4-20 154-7503 s 154-7502 l 454-7503 l 454-7502 l
4.500
STAMPED STEEL COVERS

350 Chevy, center bolted 8 1/4-20 3.250 100-7509 s 100-7510 l 400-7509 l 400-7510 l

Bolt kit 8 1/4-20 0.515 100-7505 s 100-7501 l 400-7505 l 400-7501 l

Bolt kit 14 1/4-20 0.515 100-7506 s 100-7502 l 400-7506 l 400-7502 l

Stud kit 8 1/4-20 1.170 200-7601 l 200-7611 l 400-7601 l 400-7611 l

Stud kit 14 1/4-20 1.170 200-7602 l 200-7612 l 400-7602 l 400-7612 l

91
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ACCESSORY STUDS

Metric Stainless Accessory Studs

ARP has developed some innovative multi-purpose accessory studs that feature a “nut starter” nose
and a hex-broached tip for ease of installation that can be used for exhaust systems, intake manifold
and a host of other uses. The studs are manufactured from a specially alloyed ARP Stainless devel-
oped by ARP that is rated at 180,000 tensile strength and are resistant to the rust and corrosion that
plagues ordinary fasteners. The studs come with 12-point nuts and flat washers.

➋
➑
➌ ➏ ➍
➎
➐ ➒ ➓

➊
Great for Intake
& Exhaust Systems

92
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEADER COLLECTOR
Metric Stainless Accessory Studs
➌ ➍ ➎ ➏ ➐ ➑ ➒ ➓
➊ ➋ Thread Thread Nose Grip Wrench Collar
Diameter & OAL Length Length Length Min. Grip Dia. Broach Size Dia.
Thread Pitch mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm mm mm (in.) 4-Pack 8-Pack 10-Pack 16-Pack

32 12.7 12.7 5.1 1.3 400-8001 400-8011 400-8021 400-8031

(1.250) (0.500) (0.500) (0.200) (0.050) l l l l

38 14.0 14.0 5.1 5.1 400-8002 400-8012 400-8022 400-8032

(1.500) (0.550) (0.550) (0.200) (0.200) l l l l

M8 x 45 15.2 20.7 5.1 3.5 8.0 3 10 13.6 400-8003 400-8013 400-8023 400-8033
1.25 x 1.25 (1.750) (0.600) (0.815) (0.200) (0.135) (0.313) (0.535) l l l l

51 15.2 21.3 5.1 9.2 400-8004 400-8014 400-8024 400-8034

(2.000) (0.600) (0.837) (0.200) (0.363) l l l l

57 15.2 21.3 5.1 15.8 400-8005 400-8015 400-8025 400-8035

(2.250) (0.600) (0.837) (0.200) (0.620) l l l l

48 17.8 19.1 11.4 400-8006 400-8016 400-8026 400-8036

n/a
(1.900) (0.700) (0.750) (0.450) l l l l
M10 x 10.0 4 12 17.8
1.25 x 1.25 (0.392) (0.700)
55 17.8 19.1 6.4 11.4 400-8007 400-8017 400-8027 400-8037
(2.150) (0.700) (0.750) (0.250) (0.450) l l l l

48 17.8 19.1 11.4 400-8008 400-8018 400-8028 400-8038

n/a
(1.900) (0.700) (0.750) (0.450) l l l l
M10 x 10.0 4 12 17.8
1.50 x 1.25 (0.392) (0.700)
55 17.8 19.1 6.4 11.4 400-8009 400-8019 400-8029 400-8039
(2.150) (0.700) (0.750) (0.250) (0.450) l l l l

Header Collector Bolts

Total flange
Application Dia. UHL 12-Point
thickness

CHEVROLET

All standard headers and collectors with 3 bolt flange (6 pcs.) 3/8-24 1.250 0.475-.600 400-1213 l

All standard headers and collectors with 3 bolt flange (6 pcs.) 3/8-24 1.375 0.600-.725 400-1214 l

All standard headers and collectors with 3 bolt flange (6 pcs.) 3/8-24 1.500 0.725-.850 400-1215 l

93
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEADER

Optional
Safety Wire
Drilled

Header Bolts & Studs

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust
headers including the popular stainless stud kit with 12-point nuts. The ARP Stainless material is not
affected by corrosion or extreme heat, making it ideal for the application. What’s more, the compact
12-point nut lets you easily slip a socket close to the pipe. Studs are manufactured with a unique
nut-starter nose that helps prevent cross-threading. Studs and bolts come either black oxide chrome
moly or polished ARP Stainless. Both are nominally rated at 180,000 psi tensile strength; substantially
stronger than Grade 8 hardware. Specially drilled “NASCAR” models are available for those who wish
to safety wire their header bolts to prevent loosening.

Application STUD STUD KITS BOLT KITS

OAL
Black Oxide Stainless Black Oxide Stainless
NOTE:
Bolts come with washers. BOLT
Qty. Size Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point
UHL

BUICK

3.8L V6 12 3/8 1.670 120-1412 l 120-1402 l 420-1412 l 420-1402 l

350-455 cid 14 3/8 1.670 120-1411 l 120-1401 l 420-1411 l 420-1401 l

350-455 cid 14 3/8 0.750 120-1101 s 120-1201 l 420-1101 l 420-1201 l

CHEVROLET, SMALL BLOCK

3/8˝ dia. bolt, 3/8˝ wrench 12 3/8 0.750 100-1101 s 100-1201 l 400-1101 l 400-1201 l
3/8˝ dia. bolt, drilled, 3/8˝ 12 3/8 0.750 100-1103 s 100-1203 l 400-1103 l 400-1203 l
wrench
3/8˝ dia. bolt, 3/8˝ wrench 12 3/8 0.875 100-1116 s 100-1216 l 400-1116 l 400-1216 l

3/8˝ dia. bolt, 3/8˝ wrench 12 3/8 1.000 100-1111 s 100-1211 l 400-1111 l 400-1211 l

3/8˝ dia. stud 14 3/8 1.670 400-1400 l

3/8˝ dia. stud 12 3/8 1.670 100-1412 l 100-1402 l 400-1412 l 400-1402 l

CHEVROLET, SMALL BLOCK - LS SERIES

1/4˝ wide header flange 12 M8 0.984 134-1101 s 134-1201 s 434-1101 l 434-1201 l

3/8˝ wide header flange 12 M8 1.181 134-1102 s 134-1202 s 434-1102 l 434-1202 l

3/8˝ wide header flange - stud kit 12 M8 1.750 434-1301 l

94
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HEADER
Header Bolts & Studs
Application STUD STUD KITS BOLT KITS
OAL
Black Oxide Stainless Black Oxide Stainless
NOTE:
Bolts come with washers. BOLT
Qty. Size Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point
UHL

CHEVROLET, SMALL BLOCK - LT SERIES

3/8˝ wide header flange - 6.2L 10 M8 1.181 134-1104 s 134-1103 s 434-1104 l 434-1103 l
(LT1/LT4)
3/8˝ wide header flange - 6.2L 10 M8 1.750 434-1401 l
(LT1/LT4)
CHEVROLET, BIG BLOCK

3/8˝ dia. bolt, 3/8˝ wrench 16 3/8 0.750 100-1102 s 100-1202 l 400-1102 l 400-1202 l

3/8˝ dia. bolt, 3/8˝ wrench 16 3/8 .875 100-1117 s 100-1217 l 400-1117 l 400-1217 l
3/8˝ dia. bolt, drilled, 3/8˝ 16 3/8 0.875 400-1104 l 400-1204 l
wrench
3/8˝ dia. stud 16 3/8 1.670 100-1413 l 100-1403 l 400-1413 l 400-1403 l

3/8˝ dia. bolt, 3/8˝ wrench 16 3/8 1.000 100-1112 s 100-1212 l 400-1112 l 400-1212 l

CHRYSLER

5/16˝ dia. bolt 14 5/16 0.750 144-1102 s 144-1202 s 444-1102 l 444-1202 l

KB Hemi, stud w/prov for blower 16 3/8 1.670/
brackets, Mopar 340-360 cid 2.000 245-1311 245-1301 445-1311 445-1301
s s l l

Neon, Spt, PT Cruiser 2.4 turbo 10 M8 2.000 441-1302 l

Neon, SOHC & DOHC 8 M8 2.000 441-1301 l

5.7L & 6.1L Hemi V8 16 M8 1.181 140-1101 s 140-1201 s 440-1101 l 440-1201 l

FORD

3/8˝ bolt 16 3/8 0.750 100-1102 s 100-1202 l 400-1102 l 400-1202 l

3/8˝ stud 16 3/8 1.670 100-1414 l 100-1404 l 400-1414 l 400-1404 l

OLDSMOBILE

330-455 cid 14 3/8 0.750 180-1101 s 180-1201 l 480-1101 l 480-1201 l

330-455 cid 14 3/8 1.670 180-1411 l 180-1401 l 480-1411 l 480-1401 l

UNIVERSAL

Bolt kit, 5/16˝ wrench 12 3/8 0.750 100-1107 s 100-1207 l 400-1107 l 400-1207 l

Bolt kit, 5/16˝ wrench 16 3/8 0.750 100-1108 s 100-1208 l 400-1108 l 400-1208 l

Bolt kit, 5/16˝ wrench 12 3/8 1.000 100-1109 s 100-1209 l 400-1109 l 400-1209 l

Bolt kit, 5/16˝ wrench 16 3/8 1.000 100-1110 s 100-1210 l 400-1110 l 400-1210 l

Bolt kit, drilled, uses 3/8˝ socket 16 3/8 0.750 400-1105 l 400-1205 l

Bolt kit, drilled, uses 3/8˝ socket 12 3/8 0.875 400-1106 l 400-1206 l
3/8- 1.500 100-1401 l 100-1411 l
Stud kit 16 5/16
Stud kit, broached w/ 12-pt, lock- 14 3/8 1.125 100-1405 l 100-1415 l
ing nut, 3/8˝

95
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 OIL PAN

TECH TIP: Always use some type of lubricant,

such as ARP Ultra-Torque fastener assem-
bly lubricant, when assembling fasteners.
Assembling without lubricant can lead to
galling or seizing, resulting in costly, time
consuming repairs.
Oil Pan Bolt & Stud Kits
The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan
studs. They’re designed to make it as easy as possible to install a pan and seal it properly. You’ll note
that the studs have a radiused bullet nose that serves to locate the pan rails, then allow the nuts to
be easily installed without the worry of cross-threading. For those who prefer bolts, ARP’s got you
covered, too. Both are available in black oxide finished chrome moly steel or polished ARP Stainless.
Also, you may choose between conventional hex style or the space-saving 12-point nuts. The stud kits
come complete with a special locking flanged nut, while the bolt kits come with washers.

Application STUD KITS BOLT KITS

NOTE: Black Oxide Stainless Black Oxide Stainless
Bolts come with washers.
Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point

CHEVROLET, SMALL BLOCK

265-400 cid (w/std. 2-pc. cork gasket) 234-1901 l 234-1902 l 434-1901 l 234-1802 s 234-1801 l 434-1802 l 434-1801 l

265-400 cid (w/ 1-pc. rubber gasket) 134-1802 s 134-1801 l 434-1804 l 434-1803 l

350 cid with girdle, 5/16˝ diameter 334-1902 l

Gen III/IV LS Series small block 134-6901 s 134-6902 s 434-6901 l 434-6902 l

GEN V 6.2L (LT1/LT4) 134-1806 s 134-1805 s 434-1806 l 434-1805 l

CHEVROLET, BIG BLOCK

396-454 cid (w/ standard 2-pc. cork gasket) 235-1901 l 235-1902 l 435-1901 l 435-1902 l 235-1802 s 235-1801 l 435-1802 l 435-1801 l

396-454 cid (w/ 1-pc. rubber gasket) 135-1802 s 135-1801 l 435-1804 l 435-1803 l

CHEVROLET, 6-CYLINDER

90° V6 333-1901 l

CHRYSLER, SMALL BLOCK

318-340-360 Wedge & 318-360 Magnum 200-1901 l 200-1902 l 400-1901 l 400-1902 l 200-1802 s 200-1801 l 400-1802 l 400-1801 l

5.7L & 6.1L Hemi 140-1802 s 140-1801 s 440-1802 l 440-1801 l

96
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 OIL PAN & OIL PUMP
Oil Pan Bolt & Stud Kits
CHRYSLER, BIG BLOCK

KB Hemi, 1.300˝ U.H.L 245-1901 l 245-1903 l

KB Hemi, 1.700˝ U.H.L 245-1902 l 245-1904 l 445-1902 l 445-1904 l

FORD, SMALL BLOCK

289-302-351C & 351W (early model) 254-1901 l 254-1902 l 454-1901 l 454-1903 l 254-1802 s 254-1801 l 454-1802 l 454-1801 l

302-351W (late model with side rails) 254-1903 l 254-1904 l 454-1902 l 454-1904 l 254-1804 s 254-1803 l 454-1804 l 454-1803 l

FORD, BIG BLOCK

390-428 cid FE Series 255-1802 s 255-1801 l 455-1802 l 455-1801 l

HOLDEN

V8 105-1802 l 105-1801 l 405-1802 l 405-1801 l

PONTIAC

350-455 cid 200-1901 l 200-1902 l 400-1901 l 400-1902 l 200-1802 s 200-1801 l 400-1802 l 400-1801 l

Oil Pump Bolts & Studs

You’ve probably heard many a horror story about someone losing an engine when the oil pump
fell off into the pan because of a broken bolt. Well, you can put your mind at ease when using ARP’s
premium grade oil pump bolt and stud kits. You have a choice of black oxide finished 8740 chrome
moly steel or polished ARP Stainless. Both are nominally rated at 180,000 psi tensile strength to
provide you with plenty of clamping force. Moreover, take your pick between conventional hex style
or 12-point designs. This is “insurance” that no conscientious engine builder should be without! The
studs come with flat washers and nuts, while the Ford bolt kit has flat washers only. These inexpensive
fasteners can literally save your engine.

Black Oxide Stainless

Application
Hex 12-Point Hex 12-Point

CHEVROLET

Small block, stud kit 230-7001 l 230-7002 l

Small & big block, 3.125˝, high volume, stud kit 230-7003 l 230-7004 l

FORD

3/8˝ & 5/16˝ 4 piece bolt kit 150-6902 s 150-6901 l 450-6902 s 450-6901 s

Oil pump to pickup, stud kit 154-7005 s

97
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 FRONT COVER, WATER PUMP
Front Cover, Water Pump & Alternator Kits
ARP’s timing cover bolts are Studs are preferred by many pro Alternators that come loose
available in both polished engine builders because they are a pain, so that’s why
stainless steel or black ox- eliminate the chance of pinching ARP came up with these
ide finish chrome moly. gaskets and contribute to easier super tough bolts. Your
engine assembly. You will note choice of chrome moly
that ARP studs feature a special steel or polished stainless
“bullet nose” to guide the nut (nominally rated at 180,000
accurately into place. psi). The stainless has the
added advantage of being
rust and corrosion
resistant.
Also available as part of ARP’s
complete Engine & Accessory kits
on page 110.

Application STUD KITS BOLT KITS

NOTE: Black Oxide Stainless Black Oxide Stainless
Bolts come with washers. Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point
BUICK

350, timing cover 120-3202 l 120-3201 l 420-3202 l 420-3201 l

CHEVROLET

90° V6, timing cover 333-1401 l

3/8˝ alternator pivot bolt 430-3303 l 430-3304 l
All V8, alternator bracket bolts 130-3302 s 130-3301 l 430-3302 l 430-3301 l
All V8, timing cover 200-1401 l 200-1411 l 400-1401 l 200-1502 l 200-1501 l 400-1502 l 400-1501 l
All V8, timing cover with Jesel belt or gear 334-1401 l
drive
All V8, water pump long 130-3202 s 130-3201 l 430-3202 l 430-3201 l
SB Chevy, water pump short 134-3204 s 134-3203 s 434-3204 l 434-3203 l
Gen III/IV LS Series, timing cover 134-1501 l 134-1502 l 434-1501 l 434-1502 l
Gen III/IV LS Series, water pump with 134-3201 s 134-3202 s 434-3201 l 434-3202 l
thermostat housing bolts
Gen III/IV LS Series, rear motor cover 134-1503 l 134-1504 l 434-1503 l 434-1504 l
Gen V 6.2L (LT1/LT4) timing cover 134-1506 l 134-1505 l 434-1506 l 434-1505 l
CHRYSLER

5.7L & 6.1L Hemi, rear main seal plate 140-0002 l 140-0001 l 440-0002 l 440-0001 l
5.7L & 6.1L Hemi, timing cover & water 140-1502 s 140-1501 s 440-1502 l 440-1501 l
pump
KB Hemi, timing cover 245-1511 l 245-1501 l 445-1511 l 445-1501 l
FORD

*Please note that the Ford water pump kits are designed for 1986 & earlier
289-302, aluminum timing cover, water 154-1504 s 154-1503 l 454-1504 l 454-1503 l
pump*
289-302, aluminum t-cover & cast iron 154-3204 s 154-3203 s 454-3204 l 454-3203 l
water pump*
289-302, cast-iron timing cover & water 154-1502 s 154-1501 l 454-1502 l 454-1501 l
pump*

98
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WATER PUMP PULLEY
Front Cover, Water Pump & Alternator Kits
Application STUD KITS BOLT KITS
NOTE: Black Oxide Stainless Black Oxide Stainless
Bolts come with washers. Hex 12-Point Hex 12-Point Hex 12-Point Hex 12-Point
289-302, aluminum timing-cover & alumi- 154-3202 s 154-3201 s 454-3202 l 454-3201 l
num water pump*
351 SVO, timing cover 354-1401 l
351C, water pump* 154-3206 s 154-3205 s 454-3206 l 454-3205 l
351W, alternator bracket bolts 150-3302 s 150-3301 s 450-3302 l 450-3301 l
PONTIAC

All V8, alternator bracket bolts 190-3302 s 190-3301 l 490-3302 l 490-3301 l

All V8, timing cover and water pump 190-1502 s 190-1501 l 490-1502 l 490-1501 l

Water Pump Pulley Studs & Bolts

Whether you’re mounting your fan directly to the water pump, or using a spacer for clearance, ARP
has you covered with our 180,000 psi water pulley kits. Our kits come in 8470 or polished ARP Stain-
less and cover spacers up to 3.250˝ in 0.250˝ increments.
8740 / Black Oxide ARP Stainless / Polished
Application
NOTE: Hex 12-Point Hex 12-Point
Bolt kits come with washers. Stud: OAL
All kits include 4 of each piece. Thread Bolt: UHL wrenching: 1/2˝ wrenching: 3/8˝ wrenching: 1/2˝ wrenching: 3/8˝

UNIVERSAL STUD KITS

broached 1.250˝ 100-3201 l 100-3216 l 400-3201 l 400-3216 l

broached, starter nose 1.450˝ 100-3202 l 100-3217 l 400-3202 l 400-3217 l
0.250˝ fan spacer, broached 1.500˝ 100-3203 l 100-3218 l 400-3203 l 400-3218 l
0.500˝ fan spacer, broached 1.750 100-3204 l 100-3219 l 400-3204 l 400-3219 l
0.750˝ fan spacer, broached 2.000 100-3205 l 100-3220 l 400-3205 l 400-3220 l
1.000˝ fan spacer, broached 2.250 100-3206 l 100-3221 l 400-3206 l 400-3221 l
1.250˝ fan spacer, broached 2.500 100-3207 l 100-3222 l 400-3207 l 400-3222 l
1.500˝ fan spacer, broached 5/16-24 2.750 100-3208 l 100-3223 l 400-3208 l 400-3223 l
1.750˝ fan spacer, broached 3.000 100-3209 l 100-3224 l 400-3209 l 400-3224 l
2.000˝ fan spacer, broached 3.250 100-3210 l 100-3225 l 400-3210 l 400-3225 l
2.250˝ fan spacer, broached 3.500 100-3211 l 100-3226 l 400-3211 l 400-3226 l
2.500˝ fan spacer, broached 3.750 100-3212 l 100-3227 l 400-3212 l 400-3227 l
2.750˝ fan spacer, broached 4.000 100-3213 l 100-3228 l 400-3213 l 400-3228 l
3.000˝ fan spacer, broached 4.250 100-3214 l 100-3229 l 400-3214 l 400-3229 l
3.250˝ fan spacer, broached 4.500 100-3215 l 100-3230 l 400-3215 l 400-3230 l
UNIVERSAL BOLT KIT

flanged head 5/16-24 0.750˝ 400-3217 l

99
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 MOTOR MOUNT, STARTER
Motor Mount Bolt Kits
Secure any engine with complete confidence with ARP’s rugged motor mount bolts. You can choose
between black oxide finished 8740 chrome moly or corrosion-resistant stainless steel; choice of hex
or 12-bolt head. Kits come complete with flat washers.

Black Oxide Stainless

Application
Hex 12-Point Hex 12-Point

Chevy, V6 & V8 - mount to block 130-3102 s 130-3101 l 430-3102 l 430-3101 l

Chevy, V6 & V8 - mount to block w/ Energy Suspension 130-3106 s 130-3107 l 430-3106 l 430-3107 l
mounts
Chevy, V6 & V8 - mount to frame 130-3105 s 430-3105 l

Chevy, LS Series small block mount bracket to block (6 pc.) 134-3102 l 134-3101 l 434-3102 l 434-3101 l

Chevy, LS Series small block mount bracket to block (8 pc.) 134-3104 l 134-3103 l 434-3104 l 434-3103 l

Chrysler 5.7L & 6.1L Hemi 140-3102 s 140-3101 s 440-3102 l 440-3101 l

Ford, 289-302-351W 150-3102 s 150-3101 s 450-3102 l 450-3101 l

Pontiac, All V8 190-3102 s 190-3101 s 490-3102 l 490-3101 l

Starter Bolt Kits

Installing starter motors in the cramped confines of a race car is simplified by use of ARP’s special
bolts, which feature small diameter heads to make accessibility more convenient. These starter bolts
are made from Custom 450 stainless steel material that is nominally rated at 180,000 psi and sub-
stantially stronger than Grade 8 hardware. ARP stainless starter bolts are 100% maintenance free and
include standard shank knurling, where applicable. Complete with washers where required.

Application Dia. UHL Hex 12-Point

CHEVROLET

All standard & OEM high torque starters, long & short 3/8-16 1.975/4.660 430-3505 l 430-3508 l

All standard & OEM high torque starters, medium 3/8-16 3.760 430-3502 l 430-3501 l

All standard & OEM high torque starters, long 3/8-16 4.660 430-3507 l 430-3509 l

Aftermarket gear reduction starters, long & short 3/8-16 1.750/4.400 430-3516 l 430-3515 l

Aftermarket gear reduction starters, long 3/8-16 4.400 430-3514 l 430-3513 l

8.1L Vortec - Long M10 4.470 430-3512 l 430-3511 l

Gen III/IV LS Series small block M10 1.775/4.470 430-3506 l 430-3510 l

FORD

2-bolt 3/8-16 1.500 450-3503 l 450-3501 l

3-bolt 3/8-16 1.500 450-3502 l

3-bolt 5/16-18 1.250 450-3606 l 450-3505 l

PRO STOCK

3/8˝ 2-bolt 3/8-16 3.760 430-3504 l

100
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 FUEL PUMP, SEAL PLATE
Fuel Pump Bolt Kits
Make sure that mechanical fuel pumps stay properly aligned by using ARP’s durable black oxide fin-
ished chrome moly or rust-proof stainless bolts (both materials are nominally rated at 180,000 psi and
considerably stronger than Grade 8 hardware). Your choice of either conventional hex or 12-point
head. Washers are included.

Black Oxide Stainless

Application
Hex 12-Point Hex 12-Point

CHEVROLET 130-1602 s 130-1601 l 430-1602 l 430-1601 l

PONTIAC 190-1602 s 190-1601 l 490-1602 l 490-1601 l

Seal Plate & Accessory Cam Drive

If the survivability of your camshaft drive, through an entire race without stripping or breaking, has
been a matter of concern – ARP’s new cam drive should put your mind to rest. We built this setup to
be “bulletproof.” Totally reliable. A through-hardened, not just case hardened, chrome moly shaft,
premium grade Viton seal, plus anodized aluminum plate are manufactured in-house to insure that
every part is guaranteed ARP quality.

Application 1.0˝ 1.5˝

All 9/16-18 x 0.625 934-0005 l 934-0006 l

SPECIFICATIONS
• Drive: forged ARP2000, 220,000 psi
alloy chrome moly steel with corro-
sion-resistant oxide finish.
• Concentricity: 0.001 T.I.R., between
The perfect compliment to our “bulletproof” shaft and hex, 1˝ and 1.5˝ length
cam drives are these precision seal plates. • Threads: form rolled
They’re made of CNC-machined 7075-T4 alloy 9/16˝ x 0.625˝ on cam end, 3/8˝ hex on
drive
aluminum and anodized to resist corrosion.
• Seal Plate: CNC-machined
Available in 2.100˝ and 2.380˝ diameters to fit 7075-T4 aluminum with
most any OEM or aftermarket block. Viton seal

Application Diameter Part No.

Small Block GM, 2.100 O.D. block 2.100 934-0007 l

Dart, aluminum block 2.380 934-0008 l

101
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CARBURETOR

Carburetor Stud Kits

The best way to make sure that carburetors stay perfectly sealed to the intake manifold is through the
use of ARP’s carb studs. They’re offered in a variety of heights to accommodate most any combination
of carb and spacer, and are available in 8740 chrome moly with a black oxide finish or ARP Stainless.
Special ARP Pro Series NASCAR type stud kits have one of the studs drilled to facilitate sealing the
carburetor in the engine by race officials. All carb studs include a nut starter nose (except where not-
ed) and kits come with hex nuts and washers.

Application Qty. Size O.A.L. Black Oxide Stainless Pro Series

Standard 4 5/16 1.700 200-2401 l 400-2401 l

Standard with Moroso #64919 return spring kit 4 5/16 1.700 (2) & 2.050 (2) 200-2421 l 400-2421 l 300-2421 l

Standard with Moroso #64927 return spring kit 4 5/16 1.700 (3) & 2.050 (1) 200-2424 l 400-2424 l 300-2424 l

1/2˝ spacer 4 5/16 2.225 200-2403 l 400-2403 l

1˝ spacer 4 5/16 2.700 200-2402 l 400-2402 l

1˝ spacer with Moroso #64919 return spring kit 4 5/16 2.700 (2) & 3.050 (2) 200-2420 l 400-2420 l 300-2420 l

1˝ spacer with Moroso #64927 return spring kit 4 5/16 2.700 (3) & 3.050 (1) 200-2423 l 400-2423 l 300-2423 l

2˝ spacer 4 5/16 3.700 200-2404 l 300-2404 l

3˝ spacer 4 5/16 4.700 200-2405 l

1-1 /4˝ Moroso spacer 4 5/16 3.200 200-2408 l 400-2408 l

2˝ Moroso spacer 8 5/16 1.250* (4) & 1.700 (4) 200-2409 l

1.250* (4) & 1.700 (2) &
2˝ Moroso spacer with Moroso #64919 return spring kit 8 5/16 200-2419 l 400-2419 l 300-2419 l
2.050 (2)
1.250* (4) & 1.700 (3) &
2˝ Moroso spacer with Moroso #64927 return spring kit 8 5/16 200-2422 l 400-2422 l 300-2422 l
2.050 (1)
Dominator with 1/2˝ or 1˝ spacer 4 5/16 3.200 200-2412 l 400-2412 l

Dominator carb stud, no spacer 4 5/16 2.225 200-2414 l 400-2414 l

Dominator carb stud, with spacer 4 5/16 4.400 200-2415 l

HP Dominator carb stud, no spacer 4 5/16 2.225 200-2416 l

HP Dominator carb stud with 1/2˝ spacer 4 5/16 2.700 200-2417 l

HP Dominator carb stud with 1˝ spacer 4 5/16 3.200 200-2418 l

*Does not have starter nose
102
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 AIR CLEANER, DISTRIBUTOR
Carburetor Stud Kits
Standard (drilled for NASCAR wire seal) 4 5/16 1.700 300-2401 l

2˝ spacer (drilled for NASCAR wire seal) 8 5/16 2.225 (1) & 1.700 (7) 300-2406 l

1˝ spacer (drilled for NASCAR wire seal) 4 5/16 2.700 300-2403 l

1/2˝ spacer (drilled for NASCAR wire seal) 4 5/16 2.225 300-2402 l

1˝ Moroso spacer (drilled for NASCAR wire seal) 4 5/16 2.700 300-2407 l

1-1/4˝ Moroso spacer (drilled for NASCAR wire seal) 4 5/16 3.200 300-2408 l
1.250* (4) & 1.700 (1) &
2˝ Moroso spacer (drilled for NASCAR wire seal) 8 5/16 300-2409 l
1.700 (1)
Quadrajet (all), with 1/4˝ base gasket 4 5/16 1.700 (2) & 4.400 (2) 200-2413 l 400-2413 l

Air Cleaner Studs

Keep your air cleaner firmly in position with an ARP stud kit. Includes your choice of a black oxide fin-
ished chrome moly or stainless steel stud with an appropriate nut. Vastly superior to the cheap fasten-
ers that sometimes get used.
Application Black Oxide Stainless Application Black Oxide Stainless

5/16 x 2.225˝ OAL 200-0301 s 400-0301 l 1/4 x 2.443˝ OAL 200-0307 l 400-0307 l

5/16 x 2.700˝ OAL 200-0302 s 400-0302 l 1/4 x 2.700˝ OAL 200-0305 s 400-0305 l

5/16 x 3.200˝ OAL 200-0303 s 400-0303 l 1/4 x 3.200˝ OAL 200-0306 s 400-0306 l

1/4 x 2.225˝ OAL 200-0304 s 400-0304 l

Distributor Stud Kits

One of the most critical – yet often overlooked – fasteners used in any engine locks the timing in
place. ARP offers these premium grade studs in black oxide finished chrome moly or polished ARP
Stainless. A special bullet nose helps guide nut into place without cross-threading. Choice of conven-
tional hex or space-saving 12-point nuts. Washers included.
Black Oxide Stainless
Application
Hex 12-Point Hex 12-Point

Chevrolet 130-1702 l 130-1701 l 430-1702 l 430-1701 l

Ford 150-1702 l 150-1701 l 450-1702 l 450-1701 l

Pontiac 190-1702 l 190-1701 l 490-1702 l 490-1701 l

103
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 INTAKE MANIFOLD

Intake Manifold Bolt & Stud Kits

Prevent intake manifold leaks with ARP’s quality fasteners. They’re nominally rated at 180,000 psi
and precision machined for optimum thread engagement. Wide underhead flange and companion
washers provide even load distribution. Precision rolled threads prevent galling while promoting
more consistent torque loading. Facilitates optimum sealing of gasket surfaces. Available in choice of
black oxide finish chrome moly or corrosion resistant stainless steel, as well as hex or 12-point heads.
Washers included.

NOTE: Kits designed for factory OEM intakes

Black Oxide Stainless

Application Stud
Hex 12-Point Hex 12-Point NASCAR
AMC

290-343-390 cid, uses 3/8˝ socket 114-2001 s 414-2001 l 414-2101 l

BUICK

3.8L V6 123-2001 s 423-2001 l

215 cid, uses 3/8˝ socket 124-2001 s 124-2101 l 424-2001 l 424-2101 l

CHEVROLET

SB 2, standard deck 334-2104 l

SB 2, tall deck, drilled 334-2105 l

Small block, 1.000˝, drilled 334-2102 l

Small block, 1.250˝, drilled 334-2103 l

265-400 cid, factory OEM, 1.000˝, 12 pieces 134-2001 s 134-2101 l 434-2001 l 434-2101 l

265-400 cid, factory OEM, 1.500˝, 12 pieces 134-2102 l

305-350 Vortec, fits most aftermarket alum. intakes 134-2002 s 134-2103 l 434-2002 l 434-2102 l

305-350 Tuned Port 134-2004 s 134-2104 l 434-2004 l 434-2104 l

LS1, LS4, LS6, 4.8L-RL4, 5.3L-LM7, 6.0L-LQ4, 4.480˝ UHL 130-2001 s 130-2101 s 430-2001 l 430-2101 l

LS, Edelbrock Intake, 45mm UHL 130-2002 s 130-2102 s 430-2002 l 430-2102 l

LS, GM Performance Intake, 55mm UHL 130-2003 s 130-2103 s 430-2003 l 430-2103 l

Gen III/IV LS Series small block, valley cover bolts 134-8001 l 134-8002 l 434-8001 l 434-8002 l

396-454 cid, 1.250˝ U.H.L. 135-2001 s 135-2101 l 435-2001 l 435-2101 l

502 cid, 1.500˝ U.H.L. 135-2002 s 435-2002 l 435-2102 l

104
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CARBURETOR FLOAT BOWL
Intake Manifold Bolt & Stud Kits
Black Oxide Stainless
Application Stud
Hex 12-Point Hex 12-Point NASCAR
CHRYSLER

318-440 Wedge, uses 3/8˝ socket 144-2001 s 144-2101 l 444-2001 l 444-2101 l

5.7L & 6.1L Hemi with aluminum intake manifold 144-2003 s 144-2103 s 444-2003 l 444-2103 l

FORD

260-289-302, 351W, uses 3/8˝ socket 154-2001 s 154-2101 l 454-2001 l 454-2101 l

289-302, 351W intake stud kit 354-2103 s

351C, 351-400M 154-2004 s 154-2104 l 454-2004 l 454-2104 l

351W, uses 3/8 wrenching 154-2002 s 154-2102 l 454-2003 l 454-2103 l

351W, Edelbrock RPM Air Gap intake 154-2005 s 154-2105 s 454-2005 l 454-2105 l

351C, Edelbrock RPM Air Gap intake 154-2006 s 154-2106 s 454-2006 l 454-2106 l

351 SVO, Jack Roush design, drilled 354-2102 l

390-428 cid FE Series 155-2002 s 155-2102 l 455-2002 l 455-2102 l

429-460 cid 155-2005 s 155-2105 l 455-2001 l 455-2101 l

HOLDEN

V8 105-2001 s 105-2101 s 405-2001 l 405-2101 l

PONTIAC

350-455 cid, uses 3/8˝ socket 194-2001 s 194-2101 l 494-2001 l 494-2101 l

Carburetor Float Bowl Kits

The smart way to attach a float bowl is with ARP’s
special new bolts. They’re made from ARP Stain- Application Pieces Part No.

less and are virtually impervious to corrosion. A Carter AFB - Edelbrock Performer & Thunder 8 400-0313 l
polished finish makes them an enhancement to Holley 2-barrel, hex 4 400-0312 l
any carb. They are 5/16˝ wrenching and nominally
Holley Dual metering blocks, hex 8 400-0310 l
rated at 180,000 psi. Available for both single and
Holley Single metering blocks, hex 8 400-0311 l
dual metering block Holley and Carter AFB appli-
cations.
105
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 COIL BRACKET, THERMOSTAT

Coil Bracket Bolts

Add a touch of class to your coil bracket installation with an ARP bolt kit. Available in black oxide
finished chrome moly or rust-proof stainless steel, as well as with a conventional hex head or 12-point
(great for tight, hard-to-reach coils). Washers included.

Black Oxide Stainless

Application
Hex 12-Point Hex 12-Point

Chevrolet 130-2302 s 130-2301 s 430-2302 l 430-2301 l

Chevrolet Small Block - LS Series 134-2302 s 134-2301 l 434-2302 l 434-2301 l

Chevrolet 6.2L (LT1/LT4) 134-2304 s 134-2303 s 434-2304 l 434-2303 l

Chrysler 5.7L & 6.1L Hemi 140-2302 s 140-2301 s 440-2302 l 440-2301 l

Ford Small Block - Windsor 150-2302 s 150-2301 l 450-2302 l 450-2301 l

Thermostat Housing Bolts

Nobody likes water leaks. And here’s ARP’s contribution to the solution. These premium grade bolts
are engineered to properly engage the manifold threads and resist loosening. They’re applica-
tion-specific, and come in your choice of black oxide finished chrome moly or rust-proof stainless
steel, with handy 12-point or standard hex heads. Washers included.

Black Oxide Stainless

Application UHL
Hex 12-Point Hex 12-Point

Chrevrolet (3 pc) 1.00/2.00 130-7402 s 130-7401 l 430-7402 l 430-7401 l

Chevrolet LS Series 20mm 134-7402 s 134-7401 s 434-7402 l 434-7401 l

Ford FE 2.250 155-7402 s 155-7401 l 455-7402 l 455-7401 l

Ford 351W 0.875 150-7402 s 150-7401 l 450-7402 l 450-7401 l

Pontiac 1.000 190-7402 s 190-7401 l 490-7402 l 490-7401 l

106
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BLOWER

Blower Studs
Engineered to minimize damage to either manifold or blower housing during unexpected blower
explosions – these break-away blower studs are designed to allow separation of manifold and blower.
Use of these special studs could save you thousands of dollars! Manufactured from premium-quali-
ty aluminum and heat-treated to provide the optimum balance between keeping the supercharger
in place and breaking under a predetermined amount of force. Kit comes complete with anodized
studs, 12-point, quality steel nuts and heavy-duty parallel-ground and hardened steel washers.

Application Diameter OAL 12-Point

Blower stud kit (blue) 7/16 2.880 100-0601 s

SSI blower stud kit (red) 7/16 2.500 100-0602 s

Blower Pulley Bolts

Application Thread UHL Hex 12-Point

671-871 blower - stainless with washers (others lengths available in bulk fasteners) 3/8-24 1.000 400-0602 l 400-0601 l

107
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HARMONIC DAMPER

Harmonic Damper Bolt Kits

As the crankshaft flexes and twists, the harmonic damper absorbs incredible amounts of kinetic ener-
gy. To ensure that the damper is locked in position, ARP has developed these ultra strong 190,000 psi
bolts that let you exert maximum clamping force. Special features include 1/4˝ thick, wide area washer
and an extra tall 12-point head that accepts a deep socket and eliminates the worry of stripping the
head.

Thread Socket
Application UHL Part No.
Size Size

BUICK

All V6 & V8 1.300 3/4-16 13/16 120-2501 l

CHEVROLET

Small block 2.470 7/16-20 5/8 134-2501 l

Small block 2.470 7/16-20 13/16 234-2501 l

Small block 2.470 7/16-20 1-1/16 234-2502 l

Gen III/IV LS Series small block (except LS7) 4.325 M16 x 2.0 1-1/16 234-2503 l

Gen IV 7.0L (LS7) & GEN V 6.2L (LT1) small block 5.185 M16 x 2.0 1-1/16 234-2504 l

CHEVROLET

Big block 1.550 1/2-20 5/8 135-2501 l

Big block 1.550 1/2-20 13/16 235-2501 l

Big block 1.550 1/2-20 1-1/16 235-2502 l

CHRYSLER

318-440 Wedge & 426 Hemi with thin damper 1.420 3/4-16 1-1/16 245-2501 l

108
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 HARMONIC DAMPER
Harmonic Damper Bolt Kits
Thread Socket
Application UHL Part No.
Size Size

318-440 Wedge with thick damper & Viper V10 2.200 3/4-16 1-1/16 240-2501 l

5.7L, 6.1L & 6.4L Hemi 4.000 M14 x 1.50 19mm 147-2501 l

SRT-10 2.175 3/4-16 13/16 147-2504 l

DIESEL

Chevy 6.6L Duramax - bolt 2.750 M18 x 1.50 36mm 129-2503 l

Chevy 6.6L Duramax - washer for 129-2503, as applicable 200-8793 s

Dodge/Cummins 5.9L 12V/24V (2007 & earlier) (4 pcs.) 1.425 M12 x 1.25 14mm 147-2502 s

Dodge/Cummins 5.9L & 6.7L 24V (2008 & later) (4 pcs.) 1.725 M12 x 1.25 14mm 147-2503 s

Ford 6.0L & 6.4L Power Stroke 2.425 M12 x 1.25 19mm 150-2505 s

Ford 6.7L Power Stroke 1.825 M12 x 1.5 19mm 150-2504 s

DODGE

Viper SRT-10 2.175 3/4-16 3/4 147-2504 s

Hellcat/Demon 4.000 M16 x 1.5 3/4 147-2803 s

FORD

1.8L & 2.0L Duratec 1.735 M14 x 1.50 19mm 251-2501 l

4.6L & 5.4L Modular V8 1.800 M12 x 1.50 18mm 156-2501 l

5.0L Coyote V8 4.200 M12 x 1.50 19mm 156-2502 l

289-460 cid (except 351C) 2.050 5/8-18 5/8 150-2501 l

351C 1.800 5/8-18 5/8 154-2501 l

7.3L Godzilla 4.850 M14 x 1.50 21mm 258-2501 l

HONDA

B Series (B16/18) 1.350 M14 x 1.25 19mm 208-2501 l

MITSUBISHI

2.0L (4G63) DOHC 1.525 M14 x 1.50 19mm 207-2501 l

NISSAN

2.6L (RB26) Inline 6 3.500 M18 x 1.50 27mm 102-2501 l

OLDSMOBILE

V8 1.300 3/4-16 13/16 180-2501 l

PONTIAC

350-455 cid 1.580 5/8-18 5/8 190-2501 l

SUBARU

FA20 4.450 M13 x 1.5 1-1/16 160-2501 l

109
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DAMPER, OIL PUMP

Square Drive Damper Bolts

Application Part No.
ARP offers a special version of its rugged 190,000 psi rated
damper bolt that can accept a standard 1/2˝ drive ratchet Buick 120-2502 l
or breaker bar to facilitate rotating the crank assembly. Chevrolet Small Block 134-2503 l

•.1/2˝ square drive forged into bolt head, enabling the rota- Chevrolet Big Block 135-2503 l
tion of an engine with any 1/2˝ drive tool Chrysler 145-2503 l

•.Made from heat-treated 8740 chrome moly steel with Ford 289-460 cid (except 351C ) 150-2503 l
heavy-duty black oxide finish Ford 351C 154-2502 l

Oldsmobile 180-2502 l

Pontiac 190-2502 l

Oil Pump Driveshaft Kits

Many an engine has been destroyed as a result of oil pump driveshaft failure. To cure this all-too-com-
mon problem, ARP has designed an extra heavy-duty shaft that will provide you with the necessary
reliability. The shaft is made from heat-treated, premium grade aerospace chrome moly steel. More-
over, the shaft diameter is a larger diameter than the OEM unit. These features combine to enable
ARP shafts to handle the added torque requirements of increased capacity oil pumps or heavy viscos-
ity lubricants.
IMPORTANT NOTE: Make sure you ALWAYS check clearances: shaft to block and pump to distributor.

CHEVY DRIVES: Made from premium grade FORD DRIVES: Made from ARP2000 and
8740 and heat-treated to 190,000 psi, ARP uses heat-treated to 220,000 psi. These pump drives
a unique manufacturing process where the feature a CNC milled (not broached) hex, and
alignment sleeve is roll formed onto the shaft has the retaining washer installed.
(not welded or pinned), enabling the sleeve to
float, allowing for slight misalignment.

Application Part No.

FORD

Application Part No. 239-312 Y block 154-7906 l

CHEVROLET 289-302 cid & Boss 302 154-7904 l

Small block (up to 1996) 134-7901 l 351W 154-7901 l

Big block 135-7901 s 351C, 351-400M 154-7905 l

Big block (+0.400 tall deck) 135-7902 s 390-428 cid FE Series 154-7902 l

Big block ( 0.400 raised camshaft) 135-7903 s 429-460 cid 154-7903 l

110
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ALTERNATOR, FUEL PUMP

Alternator Stud Kits

Strange as it may seem, there have been many races lost in oval track, off-road and endurance
competition due to the OEM alternator stud failing and the subsequent loss of electrical power. To
prevent this from ever happening, conscientious engine builders rely on ARP’s “bulletproof” alterna-
tor studs. They’re made from a premium grade 8740 chrome moly steel alloy and heat-treated to a
nominal 190,000 psi tensile strength. They are very rigid and won’t bend under the stress of competi-
tion, eliminating problems with alternator pulley alignment. Here’s more reliable “insurance” from the
innovators at ARP. Available in 5.000˝ and 5.250˝ lengths. Includes a 12-point nut and flat washer.

Description OAL Coarse Thread Length Fine Thread Length Part No.

7/16 stud 5.000 1.000 1.000 300-0501 s

7/16 stud 5.250 1.000 1.000 300-0502 s

Fuel Pump Pushrod Kits

Stock fuel pump pushrods leave a lot to be desired. In fact, they’ve been known to break at the most
inopportune time. To provide you with required reliability and improved performance, ARP has de-
veloped these sophisticated and durable pushrods. They’re made from premium grade aerospace
chrome moly and centerless ground to precise diameter. A hollow core serves to reduce the recip-
rocating mass, which requires less energy to operate. The less drag on the motor, the more power
available to you!

Application Diameter OAL Part No.

Chevy Small Block - for standard cams 1/2 5.750˝ 134-8701 l

Chevy Small Block - with aluminum bronze tip for roller cams 1/2 5.750˝ 134-8702 l

Chevy Big Block - for standard cams 1/2 5.750˝ 135-8701 s

Chevy Big Block - with aluminum bronze tip for roller cams 1/2 5.750˝ 135-8702 s

111
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CAM

Cam Bolt Kits

Install an ARP cam bolt kit and end your camshaft timing worries! ARP quality delivers increased pre-
load clamping force and assures positive timing gear register. Includes appropriate fasteners for your
application. Increased material strength overcomes valve train harmonics and stress. Added features
include oversized bolt head flange for cam button retention and reduced socket head size to facilitate
easy installation and removal. Available in both High Performance and Pro Series kits.

Thread Socket High Perf. Pro Series

Application UHL
Size Size 180,000 psi 190,000 psi

BMW

1.6L Mini - cam sprocket bolt kit 2.085 M12 x 1.5 19mm 206-1001 l

BUICK

All V6 0.560 5/16-18 3/8 123-1001 l

CHEVROLET

265-454 cid 0.750 5/16-18 1/2 134-1001 l 234-1001 l

265-454 cid - with oversize head for use with cam button 0.750 5/16-18 7/16 300-1001 l

Gen III/IV LS Series small block - cam retainer plate 20mm (.787 in.) M8 x 1.25 10mm 134-1002 l

Gen III/LS Series small block - cam sprocket bolt kit 25mm (.984 in.) M8 x 1.25 10mm 134-1003 l

CHRYSLER

383-440 Wedge & 426 Hemi - 3 bolt pattern 0.750 3/8-16 5/8 144-1001 s
383-440 Wedge & 426 Hemi - 3 bolt pattern (reduced head, extended 0.875 3/8-16 3/8 244-1001 l
length)
FORD

260-289-302 cid (1965-68) 1.460 3/8-16 5/8 154-1001 s 254-1001 s

302-351W cid (1969 & later) 1.580 3/8-16 5/8 155-1001 s 255-1001 s

351C, 351-400M 1.970 3/8-16 5/8 154-1002 s 254-1002 s

351 SVO - cam retainer plate bolt kit 0.750 1/4-20 7/16 250-1001 l

390-428 cid FE Series 1.750 7/16-14 5/8 155-1002 l 255-1002 l

429-460 cid 1.580 3/8-16 5/8 155-1001 l 255-1001 l

35mm
6.2L V8 cam phaser bolt kit, 12 bolts, RH thread M6 x 1.0 8mm 155-1003 l
(1.378 in)
6.2L V8 cam phaser and sprocket bolt kit, 6 bolts 1.700 M7 x 1.0 10mm 255-1003 l

FORD, 4-CYLINDER

2.0L Zetec 1.600 M10 x 1.5 18mm 251-1002 l

112
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CAM TOWER
Thread Socket High Perf. Pro Series
Application UHL
Size Size 180,000 psi 190,000 psi

2.3L Duratec 1.225 M10 x 1.5 15mm 151-1001 l

FORD, COYOTE

35mm (1.378
5.0L cam phaser bolt kit, 24 bolts, RH thread M6 x 1.0 8mm 156-1006 l
in)
5.0L cam phaser and sprocket bolt kit, 12 bolts - ARP2000 (220,000 psi) 1.700 M7 x 1.0 10mm 256-1003 l

FORD, MODULAR

4.6L & 5.4L Modular V8 - M10 cam sprocket bolt kit (1 per cam required) 1.700 M10 x 1.5 18mm 256-1002 l

4.6L & 5.4L Modular V8 - M12 cam sprocket bolt kit (1 per cam required) 1.800 M12 x 1.5 18mm 256-1001 l

MITSUBISHI

2.0L (4G63) DOHC - cam sprocket bolt kit 1.180 M12 x 1.25 14mm 107-1002 l

PONTIAC

350-455 cid 1.000 1/2-20 3/4 190-1001 s

TOP FUEL

Hemi (220,000 psi) 1.380 3/8-24 3/8 244-1002 l

Cam Tower Bolt & Stud Kits

Camshaft positioning is critical on overhead cam engines and ARP makes sure that the cam towers
are properly secured through use of these durable bolts and studs. They’re made from 8740 chrome
moly steel, with threads rolled after heat treat to ensure the optimum fatigue strength. Far superior to
OEM fasteners.
Thread Socket High Perf. Pro Series
Application UHL
Size Size 180,000 psi 190,000 psi

CHRYSLER

2.0L DOHC & 2.4L DOHC - cam tower stud kit (head# 4667086) 1.825 / 2.115 M6 x 1.0 / M8 x 1.0 8mm / 10mm 141-1001 l

FORD, MODULAR

4.6L & 5.4L 2V - cam tower stud kit 1.825 / 2.070 M6 x 1.0 8mm 156-1002 l

4.6L & 5.4L 3V - cam tower stud kit 1.825 M6 x 1.0 8mm 156-1001 l

4.6L 4V - cam tower stud kit 1.825 / 2.070 M6 x 1.0 8mm 156-1003 l

5.0L Coyote - cam tower bolt kit - hex 1.575 M6 x 1.0 8mm 156-1005 l

5.0L Coyote - cam tower bolt kit - 12pt 1.575 M6 x 1.0 8mm 156-1004 l

HYUNDAI

2.0L (G4KF) - cam tower stud kit 1.825 / 2.115 M6 x 1.0 / M8 x 1.0 8mm / 10mm 128-1001 l

MITSUBISHI

2.0L (4B11) Turbo - cam tower stud kit 1.825 / 2.115 M6 x 1.0 / M8 x 1.0 8mm / 10mm 107-1001 l

2.0L (4G63) DOHC - cam tower bolt kit 1.575 M8 x 1.25 10mm 107-1003 l

VOLKSWAGEN/AUDI

2.0L (FSI) - cam tower bolt kit 1.500 M6 x 1.0 8mm 104-1001 s

113
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ENGINE & ACCESSORY

Engine & Accessory Fastener Kits

It’s easy to assemble a show-quality engine when has the added benefit of being resistant to rust
you use ARP’s handy Engine & Accessory Fas- and corrosion. The stainless steel is polished to
tener Kit. Virtually everything you need comes achieve a brilliant luster, and provides a distinc-
completely organized in one convenient package tive, maintenance-free environment. Each kit has
(no need to deal with twelve different part num- a dozen different type fasteners, all neatly orga-
bers)! More importantly, each and every fastener nized and labeled in protective vacuum-wrapped
is superior in strength to the OEM bolts, and also packages.
significantly better than hardware grades (even
Grade 8). You have a choice of two premium Both materials are nominally rated at 180,000
quality materials and finishes. psi tensile strength and come in both hex and
12-point heads.
Those who desire a dazzling engine will no doubt
prefer fasteners made of ARP Stainless, which

Please note that these kits are designed for 1986 & earlier carbureted engines.
Newer EFI applications may require the purchase of additional fasteners.

• Each Kit Contains 12 Groups of Fasteners (except for Briggs & Stratton and Suzuki)

• Black Oxide Finish 8740 Chrome Moly Steel or polished ARP Stainless

• Stronger Than Any Hardware Grades

• Choice Of Hex or 12-Point Heads

•. . . . Available For All Popular Engine Types

• 100% Satisfaction Guaranteed.

• Save Time, Money and Hassles!

114
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ENGINE & ACCESSORY
Engine & Accessory Fastener Kits

NOTE
1987 & newer EFI engines or
those with aftermarket compo-
nents may require additional
fasteners be purchased

Black Oxide Stainless

Application
Hex 12-Point Hex 12-Point
BRIGGS & STRATTON

4-cycle, 5 horsepower Jr. Dragster 500-9601 l 500-9501 l

CHEVROLET

350-400 cid with headers (1986 & earlier)* 534-9801 l 534-9701 l 534-9601 l 534-9501 l

305-350 cid with headers (1987-95) 534-9802 l 534-9702 l 534-9602 l 534-9502 l

350 LT1-LT4 with headers (1992-97) 534-9803 l 534-9703 l 534-9603 l 534-9503 l

305-350 Vortec with headers (1996 & later) except LS1 and LS6 534-9804 l 534-9704 l 534-9604 l 534-9504 l
Gen III/LS Series small block, with stock exhaust manifold or headers 534-9805 l 534-9705 l 534-9605 l 534-9505 l
with 0.375-0.500˝ flange
396-454 cid* 535-9801 l 535-9701 l 535-9601 l 535-9501 l

CHRYSLER

318-340-360 Wedge* 544-9801 s 544-9701 s 544-9601 l 544-9501 l

383-440 Wedge 545-9801 s 545-9701 s 545-9601 l 545-9501 l

5.7/6.1L Hemi with aluminum intake* 540-9801 s 540-9701 s 540-9601 l 540-9501 l

FORD

289-302 cid* 554-9801 s 554-9701 s 554-9601 l 554-9501 l

Boss 302* 554-9802 s 554-9702 s 554-9602 l 554-9502 l

351 Cleveland 554-9804 s 554-9704 s 554-9604 l 554-9504 l

351 Windsor* 554-9803 s 554-9703 s 554-9603 l 554-9503 l

390-428 FE Series 555-9802 s 555-9702 s 555-9602 l 555-9502 l

429-460 cid* 555-9801 s 555-9701 s 555-9601 l 555-9501 l

PONTIAC

350-455 cid* 594-9801 s 594-9701 s 594-9601 l 594-9501 l

SUZUKI

GSX 1300R Hayabusa - Case halves bolt kit 471-9501 l

GSX 1300R Hayabusa - Accessory bolt kit 571-9501 l

115
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DRIVELINE
FLYWHEEL

Flywheel Bolt Kits

Flywheel and Flexplate bolts play an important role in the performance and safety of race cars and
street machines alike. That’s why the fastener experts at ARP have developed special bolts that are far
superior to OEM hardware. ARP offers two styles of Flywheel/Flexplate bolts: The premium grade Pro
Series, originally developed for NASCAR competition, has a 190,000 psi rating and the High Perfor-
mance Series is rated at 180,000 psi. They are both forged from aerospace alloy and heat-treated
prior to thread rolling and machining. Both feature an exclusive, flat, 12-point head design and larg-
er than stock shank diameter for increased strength and improved flywheel register. Complete with
washers and nuts where applicable.

NOTE 1: All flywheel and flexplate bolts listed below are Pro Series 190,000 psi rated bolts unless noted otherwise.
NOTE 2: The thread size of metric fasteners is listed using international designations. For example, “M10” indicates a 10mm thread size.
NOTE 3: SMF = Single Mass Flywheel

Application UHL Thread Size Part No.

BMC

1600cc A Series 0.900 3/8-24 206-2802 l

BMW

2.3L (S14) (22mm UHL) 0.870 M12 x 1.5 201-2801 l

2.3L (S14) (28mm UHL) 1.100 M12 x 1.5 201-2802 l

CHEVROLET

90° V6 & 265-454 V8 w/ 2pc. rear seal 1.000 7/16-20 200-2802 l

90° V6 & 305-502 V8 w/ 1pc. rear seal 1.000 7/16-20 200-2807 l

V8 with Tilton flywheel - uses 1/2˝ socket 0.875 7/16-20 330-2801 l

Gen III/IV LS Series small block 0.880 M11 x 1.5 330-2802 l

Gen V 6.2L (LT1/LT4) 2013 & later 1.125 M11 x 1.5 234-2801 l

LT1 6.2L 0.900 M11 x 1.0 234-2802 l

6.6L Duramax diesel 1.600 M16 x 1.5 230-2801 l

116
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DRIVELINE
FLYWHEEL
Flywheel Bolt Kits
Application UHL Thread Size Part No.

CHRYSLER/DODGE

SL6, 3.9L V6 & 273-440 V8 w/ 6 bolt crank 0.875 7/16-20 240-2801 l

Aftermarket 383-440 V8 & 426 Hemi w/ 8 bolt crank 0.875 1/2-20 245-2801 l

5.7L, 6.1L & 6.4L Hemi V8 1.000 M10 x 1.0 147-2801 l

5.9L 12V/24V Cummins diesel (2004 & earlier) 1.250 M12 x 1.25 147-2802 s

FORD

1.8L & 2.0L Duratec 0.990 M12 x 1.0 251-2802 l

2.0L (YB Series) Cosworth 1.150 M10 x 1.0 251-2803 l

2.0L Zetec 0.900 M11 x 1.0 251-2801 l

2000cc Pinto 1.150 M10 x 1.0 151-2801 l

4.6L & 5.4L Modular V8 1.000 M10 x 1.0 254-2801 l

5.0L Coyote V8 0.975 M10 x 1.0 156-2801 l

289-460 V8 1.000 7/16-20 200-2802 l

351 NASCAR V8 - uses 3/4˝ socket 0.925 7/16-20 350-2802 l

V8 with Tilton flywheel - uses 1/2˝ socket 0.950 7/16-20 350-2801 l

6.0L & 6.4L Power Stroke diesel (SMF) *3 2.015 M10 x 1.0 150-2802 s

6.4L Power Stroke diesel - crank flange adapter bolt kit 2.425 M12 x 1.25 150-2506 l

6.7L Power Stroke diesel 1.825 M12 x 1.5 150-2801 s

HONDA

1.5L & 1.6L SOHC, D Series (6 pcs.) 0.780 M12 x 1.0 208-2801 l

1.6L, 1.7L, 1.8L & 2.0L DOHC B Series (8 pcs.) 0.890 M12 x 1.0 208-2802 l

HYUNDAI

2.0L (G4KF) 1.000 M12 x 1.25 128-2801 l

JEEP

4.0L inline 6 0.875 1/2-20 146-2801 l

MINI

1.6L N12, N14, N16, N18, (SMF) *3 0.800 M9 x 1.25 101-2801 l

1.6L N12, N14, N16, N18, 4-cylinder 1.000 M9 x 1.25 101-2802 l

MITSUBISHI

2.0L (4B11) DOHC (2008 & later) 0.700 M12 x 1.25 207-2801 l

2.0L (4G63) DOHC (1992 & earlier) (6 pcs.) 0.825 M12 x 1.25 107-2802 l

2.0L (4G63) DOHC (1993-07) (7 pcs.) 0.825 M12 x 1.25 107-2801 l

2.0L (4G63) DOHC (1996-07) EVO 4-9 (7pcs.) 0.600 M12 x 1.25 107-2803 l

117
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DRIVELINE
FLYWHEEL
Flywheel Bolt Kits
Application UHL Thread Size Part No.

NISSAN

2.0L (SR20DE/DET) 4-cyl 0.925 M10 x 1.0 102-2803 l

2.4L (KA24) 4-cyl 1.000 M12 x 1.25 102-2802 l

2.5L (RB25) & 2.6L (RB26) inline 6 1.180 M12 X 1.25 102-2801 l

OPEL/VAUXHALL

2.0L 0.985 M10 x 1.25 209-2801 l

PONTIAC

Iron Duke 4 cylinder (12 pcs.) 0.750 7/16-20 291-2801 l

350-455 V8 (6 pcs.) 0.875 1/2-20 290-2802 s

PORSCHE

2.0L-3.0L air cooled (1970-77) 1.000 M12 x 1.25 204-2802 l

3.0L-3.8L air cooled (1978-97) 0.770 M10 x 1.25 204-2801 l

ROVER

K Series (6 pcs.) 0.826 M10 x 1.0 206-2803 l

SUBARU

2.0L (FA20) DOHC 0.925 M10 x 1.0 260-2801 l

SUZUKI

1.6L (M16A) DOHC 0.750 M10 x 1.25 171-2801 l

TOP FUEL

8740 with washers (190,000 psi) 1.000 1/2-20 200-2804 s

L19 with washers (260,000 psi) 1.000 1/2-20 200-2805 s

TOYOTA

1.6L (4AGE) DOHC (8 pcs.) 1.050 M10 x 1.25 203-2802 l

1.8L (2ZZGE) DOHC 0.875 M10 x 1.25 103-2802 l

2.0L (3SGTE) DOHC (8 pcs.) 1.000 M12 x 1.25 203-2801 l

2.0L (4UGSE) 0.925 M10 x 1.0 203-2804 l

2.2L (20R) & 2.4L (22R) (6 pcs.) 1.040 M11 x 1.25 203-2803 l

2.4L (2AZFE) DOHC (8 pcs.) 1.000 M12 x 1.25 103-2801 l

VAUXHALL - SEE OPEL, ABOVE

118
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DRIVELINE
FLEXPLATE

Flexplate Bolt Kits

ARP offers two styles of Flexplate bolts: premium grade Pro Series rated at 190,000 psi and High
Performance Series that are rated at 180,000 psi. Both feature an exclusive, flat, 12-point head design
and larger than stock shank diameter for increased strength and improved flywheel register.

Application UHL Thread Size Part No.

CHEVROLET

90° V6 & 265-454 V8 w/ 2pc. rear seal 0.680 7/16-20 200-2902 l

90° V6 & 305-502 V8 w/ 1pc. rear seal 0.725 7/16-20 200-2906 l

Gen III/IV LS Series small block 0.880 M11 x 1.5 244-2901 l

Gen III/IV LS Series small block w/ 700R4/ Turbo 350-400 adapter plate 1.075 M11 x 1.5 244-2902 l

Gen V 6.2L (LT1/LT4) small block 0.760 M11 x 1.5 234-2902 l

6.6L Duramax diesel 0.775 M16 x 1.5 230-2901 l

CHRYSLER/DODGE

SL6, 3.9L V6 & 273-440 V8 w/ 6 bolt crank 0.500 7/16-20 200-2903 l

Aftermarket 383-440 V8 & Hemi w/ 8 bolt crank 0.500 1/2-20 200-2905 l

5.7L, 6.1L & 6.4L Hemi 0.700 M10 x 1.0 147-2902 l

5.9L 12V & 24V Cummins diesel 0.700 M12 x 1.25 147-2901 l

FORD

2000cc & 2300cc Pinto 0.800 M10 x 1.0 251-2901 l

289-460 V8 0.680 7/16-20 200-2902 l

4.6L & 5.4L Modular V8 0.800 M10 x 1.0 254-2901 l

6.0L & 6.4L Power Stroke diesel 1.275 M10 x 1.0 150-2902 s

6.7L Power Stroke diesel 1.825 M12 x 1.5 150-2901 s

7.3L Godzilla 0.780 M10 x 1.0 158-2901 s

JEEP

4.0L inline 6 0.500 1/2-20 146-2901 l

MITSUBISHI

2.0L (4G63) DOHC (1992 & earlier) (6 pcs.) 0.700 M12 x 1.25 107-2901 l

2.0L (4G63) DOHC (1993-07) (7 pcs.) 0.460 M12 x 1.25 107-2902 l

119
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TORQUE CONVERTER
Flexplate Bolt Kits
Application UHL Thread Size Part No.

NISSAN

2.4L (KA24) 4-cyl 0.460 M12 x 1.25 102-2902 l

2.5L (RB25) & 2.6L (RB26) inline 6 0.700 M12 x 1.25 102-2901 l

PONTIAC

350-455 V8 0.675 1/2-20 200-2904 l

SUBARU

2.0L (FA20) DOHC 0.925 M10 x 1.0 260-2901 l

TOYOTA

2.0L (4UGSE) DOHC 0.925 M10 x 1.0 203-2901 l

Torque Converter Bolts

You can forget about the problem of shearing a torque converter bolt after you install these super
strong 190,000 psi gems. They are designed for each specific application and provide the optimum
grip. Kits come with hardened parallel-ground washers.

Application UHL Thread Size Pro Series

CHRYSLER/DODGE

Torqueflite 727 & 904 w/ production converter 0.450 5/16-24 240-7301 l

Torqueflite 727 & 904 w/ aftermarket converter 0.500 7/16-20 240-7302 l

NAG1 five speed automatic w/ production converter 0.700 M8 X1.25 147-7301 l

GENERAL MOTORS

Powerglide, TH350 & TH400 w/ production converter 0.750 3/8-24 230-7301 s

Powerglide, TH350 & TH400 w/ most aftermarket converter 0.725 7/16-20 230-7302 l

Powerglide, TH350 & TH400 w/ race converter - 1/2˝ thick tabs 1.250 7/16-20 230-7303 l

200, 700, 4L60 & 4L80 (3pcs. car) 0.590 M10 x 1.5 230-7304 l

200, 700, 4L60 & 4L80 (6pcs. truck) 0.590 M10 x 1.5 230-7305 l

Universal IMCA Brenn drive flange kit (6 bolts) 1.250 7/16-20 230-7306 l

120
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 RING GEAR

Ring Gear Bolt Kits

The tremendous shock loads generated at launch by most any drag racing vehicle equipped with
today’s sticky tire compounds or the acceleration and deceleration of oval track cars put considerable
strain on the ring gear. For this reason, the fastener experts at ARP have developed the Pro Series ring
gear bolts. They’re forged from premium grade 8740 chrome moly steel and are heat-treated to a
nominal rating of 190,000 psi tensile strength. Specially hardened, precision-ground washers are in-
cluded where required. Available to fit most any ring gear setup ranging from popular 9˝ Ford GM 10-
& 12-bolt rear ends to the beefy Strange differentials found in Top Fuel and Funny Car applications.

Application UHL Thread Part No.

CHRYSLER

7-1/4˝ and 8-3/4˝ (1972 & earlier) .390 grip 0.835 3/8-24 LH 240-3001 l

TECH NOTE Clutch-type LSD- case half bolts with washers 2.800 3/8-24 LH 250-3006 s

DANA
It is critically important to prop-
erly tighten ring gear bolts and Dana 60 1.060 1/2-20 200-3001 l
make sure they don’t loosen. This FORD
is especially important in drag
cars with tire shake. It’s also a 8˝ ring gear bolt kit with washers 0.940 7/16-20 250-3009 l

good idea to check bolt tightness 9˝ uses 5/8˝ socket 0.940 7/16-20 250-3002 l
on a routine basis. If you use a 8.8˝ and 9˝ uses 3/4˝ socket 0.750 7/16-20 250-3003 l
locking compound (like Loc-Tite),
it is best to install the ring gear Ring gear bolt kit with washers, 1/2˝ shank 1.060 7/16-20 350-3004 s

first without any compound, then GENERAL MOTORS

remove the bolts one at a time, 8.2˝ 10-bolt and all 12-bolt 0.800 3/8-24 230-3001 l
reinstalling them with the com-
pound. Be sure and torque each 7.2˝, 7.5˝, 7.625˝ and 8.5˝ 10-bolt 0.850 7/16-20 LH 230-3002 l
bolt before going on to the next STRANGE
one, because the Loc-Tite sets up
Top Fuel differential with washers 1.200 7/16-20 250-3001 s
fast. Install and torque the bolts in
TRU-TRAC
an alternating or crossing pat-
tern to distribute the load evenly Tru-trac 1.065 7/16-20 300-3001 s
around the ring gear. VOLKSWAGEN

VW 020 ring gear bolt kit with 12pt nuts 1.200 M9 x 1.00 204-3001 l

VW 02A ring gear bolt kit with 12pt nuts 1.180 M10 x 1.25 204-3002 l

VW 02M ring gear bolt kit with 12pt nuts 1.100 M9 x 1.00 204-3003 l

121
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BELLHOUSING

Bellhousing Bolt & Stud Kits

These premium grade bolt and stud kits are engineered to properly engage the engine block threads
and resist loosening. They’re application-specific, and come in your choice of black oxide finished
chrome moly or rust-proof stainless steel, with handy 12-point or standard hex heads. Washers and
nuts included where applicable.

Stud OAL Black Oxide Stainless

Application Thread Size
Bolt UHL Hex 12-Point Hex 12-Point
CHEVROLET - BELLHOUSING TO ENGINE BLOCK BOLT KITS

V6 & V8 3/8-16 1.375 129-0901 s 129-0902 s 429-0901 l 429-0902 l

Gen III/LS Series small block M10 x 1.5 1.375 134-0901 l 134-0902 l 434-0901 l 434-0902 l

CHRYSLER/DODGE - BELLHOUSING TO ENGINE BLOCK BOLT KITS

3/8-16 1.375
273-318-340-360 Wedge 144-0901 s 144-0902 s 444-0901 l 444-0902 l
7/16-14 1.500/1.750

3/8-16 1.250
383-400-413-426-440 Wedge 145-0901 s 145-0902 s 445-0903 l 445-0902 l
7/16-14 2.000/2.250
FORD - BELLHOUSING TO ENGINE BLOCK BOLT KITS

289-302-351W small block - Automatic Transmission 7/16-14 1.500 154-0901 s 154-0902 l 454-0901 l 454-0902 l

289-302-351W small block - Manual Transmission 7/16-14 1.500/2.250 154-0903 s 154-0904 s 454-0903 l 454-0904 l

TOP FUEL- BELLHOUSING TO ENGINE BLOCK STUD KITS

Chevy, Chrysler KB Hemi 3/8 2.000 245-0901 s 445-0901 l

Top fuel motor plate, std. 7/16 2.150 245-0202 s

Top fuel motor plate, w/ 1/4˝ spacer 7/16 2.400 245-0201 s

UNIVERSAL - BELLHOUSING TO MANUAL TRANS STUD KITS

7/16-14 7/16-14 2.750 100-0903 s 100-0904 s 400-0903 l 400-0904 l

1/2-13 1/2-13 2.750 100-0901 s 100-0902 s 400-0901 l 400-0902 l

122
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 REAR END, CARRIER

Rear End Cover Bolt Kits

Here’s an easy way to enhance the appearance of any
GM 10 or 12-bolt rear end setup. ARP Stainless rear Application UHL Thread Part No.
end cover bolts offer a lustrous contrast to a painted
GM 10-bolt, 12pt 0.750 5/16-18 437-3001 l
OEM cover or perfectly compliment a chrome plated
aftermarket version. These bolts are nominally rated GM 12-bolt, 12pt 0.750 5/16-18 437-3002 l
at 180,000 psi and much stronger than stock (or even Dana 60/40, 12pt 0.750 3/8-16 450-2701 l
Grade 8) hardware, have rolled threads for secure en-
Dana 60/40, hex 0.750 3/8-16 450-2702 l
gagement and is resistant to rust and corrosion. Wash-
ers included.

Carrier Fasteners
Application UHL Thread Part No.
When assembling a rear end, opti-
mum reliability can be FORD

obtained by employing these 8˝ carrier bearing stud kit 2.600 7/16-14,7/16-20 250-3008 s
rugged chrome moly bolts and
8˝ and 9˝ pinion support bolt kit 1.000 3/8-16 250-3007 s
studs.
9˝ carrier bearing stud kit 3.250 1/2-13, 1/2-20 250-3004 s

9˝ carrier bearing stud kit, H case (hex) 3.400 1/2-13, 1/2-20 250-3012 s

9˝ carrier bearing stud kit, H case (12pt) 3.400 1/2-13, 1/2-20 250-3013 s

9˝ housing stud kit (10 pcs.) 1.645 3/8-24 250-3005 l

9˝ pinion support stud kit (12 pt, ss) 2.000 3/8-16, 3/8-24 250-3010 l

9˝ pinion support stud kit (hex, ss) 2.000 3/8-16, 3/8-24 250-3011 l

9˝ pinion support stud kit (12 pt, blk) 2.000 3/8-16, 3/8-24 250-3020 l

9˝ pinion support stud kit (hex, blk) 2.000 3/8-16, 3/8-24 250-3021 l

123
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 PRESSURE PLATE

Clutch Cover/Pressure Plate Bolt Kits

The importance of pressure plate bolts in a racing or hi-performance street application cannot be
emphasized nearly enough. These fasteners play a key role in both the performance and safety of a
vehicle. Because of this, ARP has developed special pressure plate bolts that are application specific
to ensure the optimum grip length. ARP offers High Performance Series bolts that are made from a
premium grade chrome moly and hardened to a nominal tensile strength of 180,000 psi. The Pro Se-
ries bolts, originally developed for NASCAR competition, are stronger and rated at 190,000 psi. Both
models feature a large diameter, low-profile design. Complete with washers.

Application Thread Size High Perf. Pro Series

CHEVROLET

265-502 V8 3/8-16 130-2201 s 230-2202 s

350 LT1 1992-97 3/8-16 134-2202 l

V8 with Tilton flywheel and 3 disk AP clutch 5/16-24 330-2202 l

V8 with Tilton flywheel (1.500 UHL bolts) 5/16-24 330-2203 l

Gen III/IV LS Series small block ( 10˝ & 11˝ clutch) .750 O.D. M10 x 1.50 134-2201 l

Gen III/IV LS Series small block (12˝ clutch) .625 O.D. M10 x 1.50 134-2203 s

CHRYSLER/DODGE

5.7L & 6.1L Hemi M10 X1.50 147-2201 s

FORD

289-460 V8 (1985 & earlier) 5/16-18 150-2201 s 250-2201 s

302-351W V8 (1986-95) M8 x 1.25 150-2202 s

4.6L & 5.4L Modular V8 M10 x 1.50 156-2201 s

V8 w/ Tilton flywheel and 3 disk AP clutch (hex) 5/16-24 350-2202 l

V8 w/ Tilton flywheel and 3 disk AP clutch (12pt) 5/16-24 350-2203 l

HONDA

SOHC D Series (6 pcs.) M8 x 1.25 108-2201 s

DOHC B Series (9 pcs.) M8 x 1.25 108-2202 s

MINI

1.6L N12, N14, N16, N18 (2008-15 Peugeot engine) M8 x 1.25 101-2201 s

1.6L W11/B16 M9 x 1.25 101-2202 l

124
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TRANSMISSION
Clutch Cover/Presure Plate Bolt Kits
NISSAN

2.4L (KA24) 4-cyl (6 pcs.) M8 x 1.25 102-2202 s

2.0L (SR20DE) 4-cyl, 2.5L (RB25) & 2.6L (RB26) Inline 6 (9 pcs.) M8 x 1.25 102-2201 s

PONTIAC

350-455 V8 3/8-16 190-2201 s 290-2201 s

SUZUKI

1.6L (M16A) M8 x 1.25 171-2201 s

TOYOTA

2.0L (20R) & 2.4L (22R) M8 X1.25 103-2201 s

Manual Transmission Case Bolt Kits

Black Oxide Stainless
Application
Hex 12-Point Hex 12-Point
GENERAL MOTORS

Muncie 4 speed (1963-1968) 130-9803 s 130-9804 s 430-9803 l 430-9804 l

Muncie 4 speed (1969-1975) 130-9801 s 130-9802 s 430-9801 l 430-9802 l

Porsche Transmission Mount Stud Kit

These fasteners are manufactured from high Application 12-Point
strength ARP Stainless and are superior to the
OEM Porsche fasteners. Porsche 911-930 Turbo 504-9502 l

Auto Transmission Pan Bolt Kits

Application 12-Point

GENERAL MOTORS

Turbo 350-400 430-0401 l

125
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 LOWER PULLEY

Lower Pulley Bolt Kits

To provide the reliability required in racing and high performance street applications, ARP offers
these premium grade nominally rated 180,000 psi fasteners to securely attach the water pump and
lower pulleys. You can count on them to perform. Washers included.

Black Oxide Stainless

UHL Socket
Application Thread
(in.) Size
Hex 12-Point Hex 12-Point

CHEVROLET - LOWER PULLEY

Small Block and Big Block, 3-piece 3/8-24 0.750 3/8 330-6809 l 330-6801 l 430-6809 l 430-6801 l

Small Block and Big Block, 3-piece 3/8-16 0.750 3/8 330-6804 l 330-6803 l 430-6804 l 430-6803 l

Small Block and Big Block, 3-piece 3/8-24 0.750 7/16 330-6806 l 330-6805 l 430-6806 l 430-6805 l

Small Block and Big Block, 3-piece 3/8-16 0.750 7/16 330-6808 l 330-6807 l 430-6808 l 430-6807 l

Small Block and Big Block, 3-piece 3/8-24 2.125 1/2 334-6801 l

FORD - LOWER PULLEY

3-piece 3/8-16 1.000 3/8 350-6811 l 350-6801 l 450-6811 l 450-6803 l

3-piece 3/8-16 1.000 7/16 350-6807 l 350-6806 l 450-6807 l 450-6806 l

4-piece 3/8-16 1.000 3/8 350-6808 l 350-6802 l 450-6808 l 450-6805 l

4-piece 3/8-16 1.000 7/16 350-6810 l 350-6809 l 450-6810 l 450-6809 l

126
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DRIVE PLATE, DRIVE PINS

Drive Plate Bolt Kits

Developed for racers who leave nothing to chance, ARP’s
Application UHL Part No.
special drive plate bolts have many important features,
including use of a premium grade chrome moly alloy, 7/16-14, 12 pt, drilled (8 pcs.)* 1.500 200-3401 s
heat-treating to 190,000 psi, J-form thread rolling after 7/16-14, 12 pt, drilled (5 pcs.)* 1.500 200-3402 s
heat-treat and a special profile. The bolts come with spe-
cial precision-ground washers.
*For use with most “Wide Five” drive hubs

Sprint Car Drive Pins

ARP sprint car drive pins feature a broached hex for ease of instal- Application Thread Part No.
lation and proper pre-load while the rounded end facilitates quick,
Front, 2.450˝ OAL 1/2-20 200-2601 s
positive wheel location. All critical shear points feature a large radius
for improved reliability and maximum load carrying capacity. Drive Rear, 3.275˝ OAL 1/2-20 200-2602 s
pins are rated 190,000 psi tensile strength.

Brake Hat Bolt Kits

The perfect upgrade for many original brake hat bolts, this ARP kit features bolts produced from only
the finest quality 8740 chrome moly. Features an exclusive 12-point cap screw design and appropri-
ate grip length per the application. All ARP brake hat bolts are drilled to permit safety wiring. Rated
190,000 psi tensile strength.

Application UHL Part No.

5/16-24 with washers, 12pt, 32 bolts 0.850 300-0801 l

5/16-18 with washers, 12pt, 32 bolts 0.850 300-0802 l

1/4-28 (48 pcs.) 0.750 300-0803 l

127
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WHEEL STUDS

Wheel Studs
UHL
replacement for stock wheel studs Knurl Length
Nose Length

heat-treated 8740 chrome moly

190,000 psi tensile strength

Knurl Diameter
cadmium plated for extra durability Please test fit the lug nuts you plan to use prior to
installing the studs in the hubs.
sold in 4- & 5-packs
Our threads are rolled to a stronger thread spec
nuts not included and some nuts may be too tight.)

Wheel Stud Hole Sizes and Proper Interference Fit for the Knurl
Our OEM replacement wheel studs are designed to press-fit into the original hole in the OEM
hub. If you are using one of our kits in another application, the hole should be checked to en-
sure it falls within the correct tolerance to allow for the proper amount of interference, so that
the stud won’t spin in the hole. For steel and cast iron hubs, the hole should be 0.006-0.016˝
smaller than the Knurl Diameter. For aluminum hubs, the hole should be 0.010-0.016˝ smaller
than the Knurl Diameter. As a courtesy, we have provided the closest standard drill size that will
provide a hole in that range.

If the hole is larger than the tolerance listed for the ma-
terial, then the studs should not be used with that hub.
The interference fit will not be tight enough and the stud
could spin in the hole.

If you need to drill out the holes in your hub, the holes
must be kept perpendicular to the face of the hub. If you
do not have a fixture that clamps to the hub to guide the
drill straight, use a setup similar to the one in the image at
right. (A hand drill will not produce satisfactory results.)

All ARP wheel studs have an underhead radius. Each hole

must be chamfered 0.025˝ to clear the underhead radius
and prevent stud failure.

128
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WHEEL STUDS
Wheel Studs
Recommended Hole Diameter for Hub Material
Knurl Knurl Nose Thread
Application UHL Part No.
Dia. Length Length Size
Steel/Cast Iron Aluminum

CHRYSLER hole dia. (in) drill hole dia. (in) drill

0.664- 43/64 in. 0.664- 43/64 in.

Chrysler, rear 0.680 3.125 0.400 0.400 1/2-20 100-7705 s 0.674 (0.672 in.) 0.670 (0.672 in.)

Chrysler, front and rear, 0.609- 39/64 in. 0.609- 39/64 in.
0.625 2.936 0.445 0.435 M14 x 1.50 100-7734 s
0.500˝ over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

Chrysler, front and rear, 0.609- 39/64 in. 0.609- 39/64 in.
0.625 3.436 0.445 0.435 M14 x 1.50 100-7735 s
1.000˝ over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

DODGE

0.569- 14.5 mm 0.569- 14.5 mm

Neon, front 0.585 2.450 0.256 0.360 M12 x 1.50 100-7721 s 0.579 (0.571 in.) 0.575 (0.571 in.)

FORD

Ford, rear disc brakes/ 0.609- 39/64 in. 0.609- 39/64 in.
0.625 3.500 0.400 0.437 1/2-20 100-7703 s
Chrysler front 0.619 (0.609 in.) 0.615 (0.609 in.)

Ford, front disc brakes, 0.602- 39/64 in. 0.602- 19/32 in.*
0.618 3.050 1.000 0.250 1/2-20 100-7707 s
early 0.612 (0.609 in.) 0.608 (0.594 in.)

0.538- 35/64 in. 0.538- 13.5mm*

Mustang II front 0.554 3.435 0.390 0.435 1/2-20 100-7714 s 0.548 (0.547 in.) 0.544 (0.532 in.)

0.579- 37/64 in.* 0.579- 37/64 in.*

Mustang (1994-04) front 0.595 3.110 0.300 0.300 1/2-20 100-7724 s 0.589 (0.578 in.) 0.585 (0.578 in.)

Mustang (2005 & later) 0.534- 13.5 mm* 0.534- 13.5 mm*
0.550 3.315 0.300 0.300 1/2-20 100-7722 s
front 0.544 (0.532 in.) 0.540 (0.532 in.)

Mustang (2005 & later)

rear & most late model 0.599- 19/32 in.* 0.599- 19/32 in.*
0.615 3.115 0.300 0.300 1/2-20 100-7723 s
Fords w/ front & rear disc 0.609 (0.594 in.) 0.605 (0.594 in.)
brakes

Mustang, M14, 0.500˝ 0.609- 39/64 in. 0.609- 39/64 in.

0.625 2.935 0.400 0.435 M14 x 1.50 100-7732 s
over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

Mustang, M14, 1.000˝ 0.609- 39/64 in. 0.609- 39/64 in.

0.625 3.435 0.400 0.435 M14 x 1.50 100-7733 s
over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

GM

0.470- 12 mm 0.470- 12 mm
Late GM drum brake 0.486 3.165 0.420 0.308 7/16-20 100-7701 s 0.480 (0.472 in.) 0.476 (0.472 in.)

Late GM disc brake and 0.564- 14.5 mm 0.564- 9/16 in.*

0.580 3.200 0.300 0.305 7/16-20 100-7702 s
early drum brake 0.574 (0.571 in.) 0.570 (0.563 in.)

Late GM Camaro, Firebird, 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 2.000 0.315 0.200 M12 x 1.50 100-7726 s
Corvette 0.503 (0.500 in.) 0.499 (0.492 in.)

129
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WHEEL STUDS
Wheel Studs
Recommended Hole Diameter for Hub Material
Knurl Knurl Nose Thread
Application UHL Part No.
Dia. Length Length Size
Steel/Cast Iron Aluminum

Late GM Camaro, Firebird, 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 2.500 0.315 0.200 M12 x 1.50 100-7725 s
Corvette 0.503 (0.500 in.) 0.499 (0.492 in.)

Late GM Camaro, Firebird, 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 2.500 0.315 none M12 x 1.50 100-7708 s
Corvette 0.503 (0.500 in.) 0.499 (0.492 in.)

Late GM Camaro, Firebird, 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 3.250 0.315 none M12 x 1.50 100-7713 s
Corvette 0.503 (0.500 in.) 0.499 (0.492 in.)

Camaro 2010-2017, M14, 0.609- 39/64 in. 0.609- 39/64 in.

0.625 2.700 0.350 0.435 M14 x 1.50 100-7736 s
0.500˝ over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

Camaro 2010-2017, M14, 0.609- 39/64 in. 0.609- 39/64 in.

0.625 3.200 0.350 0.435 M14 x 1.50 100-7737 s
1.000˝ over stock length 0.619 (0.609 in.) 0.615 (0.609 in.)

Corvette C5 Short 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 1.950 0.300 0.300 1/2-20 100-7730 s
1/2˝ conversion 0.503 (0.500 in.) 0.499 (0.492 in.)

Corvette C5 1/2˝ conver- 0.493- 1/2 in. 0.493- 12.5 mm*

0.509 2.675 0.300 0.300 1/2-20 100-7731 s
sion 0.503 (0.500 in.) 0.499 (0.492 in.)

HONDA

Stock replacement (1996 0.469- 12 mm 0.469- 12 mm

0.485 1.850 0.275 0.350 M12 x 1.50 100-7709 s
& earlier) 4 pack 0.479 (0.472 in.) 0.475 (0.472 in.)

Stock replacement (1997 0.469- 12 mm 0.469- 12 mm

0.485 1.850 0.275 0.350 M12 x 1.50 100-7710 s
& later) 5 pack 0.479 (0.472 in.) 0.475 (0.472 in.)

Extended length (1996 & 0.469- 12 mm 0.469- 12 mm

0.485 2.850 0.275 0.350 M12 x 1.50 100-7711 s
earlier) 4 pack 0.479 (0.472 in.) 0.475 (0.472 in.)

Extended length (1997 & 0.469- 12 mm 0.469- 12 mm

later), Civic Si 5 pack 0.485 2.850 0.275 0.350 M12 x 1.50 100-7712 s 0.479 (0.472 in.) 0.475 (0.472 in.)

0.631- 41/64 in. 0.631- 16 mm*

Civic Type R 5 pack 0.647 3.000 0.270 0.395 M14 x 1.50 100-7744 s 0.641 (0.641 in.) 0.637 (0.630 in.)

LEXUS

0.542- 35/64 in. 0.542- 35/64 in.

IS 300 0.558 2.600 0.230 none M12 x 1.50 100-7715 s 0.552 (0.547 in.) 0.548 (0.547 in.)

MAZDA

Miata, front and rear 0.491- 12.5 mm 0.491- 12.5 mm

(1990-93) & front (1994- 0.507 2.750 0.335 0.350 M12 x 1.50 100-7719 s 0.501 (0.492 in.) 0.497 (0.492 in.)
05) 4 pack

Miata, rear (1994-05) 4 0.563- 14.5 mm 0.563- 9/16 in.

0.579 2.750 0.300 0.350 M12 x 1.50 100-7720 s
pack 0.573 (0.571 in.) 0.569 (0.563 in.)

130
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WHEEL STUDS
Wheel Studs
Recommended Hole Diameter for Hub Material
Knurl Knurl Nose Thread
Application UHL Part No.
Dia. Length Length Size
Steel/Cast Iron Aluminum

0.491- 12.5 mm 0.491- 12.5 mm

RX7, 5 pack 0.507 2.750 0.335 0.350 M12 x 1.50 100-7743 s 0.501 (0.492 in.) 0.497 (0.492 in.)

MITSUBISHI

0.549- 14 mm 0.549- 14 mm
Lancer EVO VIII 0.565 3.000 0.270 0.350 M12 x 1.50 100-7717 s 0.559 (0.551 in.) 0.555 (0.551 in.)

SUBARU

BRZ & WRX 0.549- 14 mm 0.549- 14 mm

0.565 1.750 0.270 none M12 x 1.25 100-7727 s
(stock replacement) 0.559 (0.551 in.) 0.555 (0.551 in.)

BRZ & WRX 0.549- 14 mm 0.549- 14 mm

(extended length with 0.565 1.950 0.270 0.200 M12 x 1.25 100-7728 s 0.559 (0.551 in.) 0.555 (0.551 in.)
nose)

BRZ & WRX 0.549- 14 mm 0.549- 14 mm

(extended length with 0.565 2.535 0.270 0.200 M12 x 1.25 100-7729 s 0.559 (0.551 in.) 0.555 (0.551 in.)
nose)

BRZ & WRX 0.549- 14 mm 0.549- 14 mm

(extended length with 0.565 3.000 0.270 0.350 M12 x 1.25 100-7716 s 0.559 (0.551 in.) 0.555 (0.551 in.)
nose)
TOYOTA

0.549- 14 mm 0.549- 14 mm
Celica GTS (1986-89) front 0.565 2.340 0.325 0.363 M12 x 1.50 100-7718 s 0.559 (0.551 in.) 0.555 (0.551 in.)

AFTERMARKET

Speedway Engineering 0.552- 14 mm* 0.552- 14 mm*

and Frankland full floating 0.568 2.970 0.710 0.465 1/2-20 100-7706 s 0.562 (0.551 in.) 0.558 (0.551 in.)
hubs

* If the standard drill bit size starred, then the nearest standard drill bit is too small. You will need to use an appropriately sized reamer to enlarge the
drilled hole until it is within the range listed for your hub material.

131
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 WHEEL STUDS
Wheel Studs
OAL
Shoulder Length
Thread Length Nose Length
Thread Length

Hub End Nut End

Thread Length Thread Size Shoulder Length Thread Length Thread Size Nose Length OAL Part No.

0.585 M12 x 1.50 0.272 1.594 M12 x 1.50 0.504 2.955 100-7745 s

UHL
Nose Length
Thread Length

Application
UHL Thread Length Nose Length Thread Size Part No.

1.950 1.750 0.200 1/2-20 100-7738 s

2.200 2.000 0.200 1/2-20 100-7739 s

2.450 2.250 0.200 1/2-20 100-7740 s

Aftermarket axles, 12 pt head, full thread
2.700 2.500 0.200 1/2-20 100-7741 s

2.950 2.750 0.200 1/2-20 100-7742 s

3.470 2.970 0.500 1/2-20 100-7704 s

132
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CIRCLE TRACK
Speed Studs™
Because races can be won or lost in the pits, the engineers at
ARP set about to create the ultimate oval track competition Bullet- 190,000 PSI
wheel stud that facilitates accurate wheel positioning and shaped chrome moly
quicker release/tightening of lug nuts. They’re made from nut-starter
nose
heat-treated 190,000 psi chrome moly steel and feature pre-
cision J-form threads (formed after heat-treat for improved Threads rolled
Precision after heat treat
fatigue strength), exclusive nut-starter and bullet shape
J-form
radius that all but eliminates cross-threading, shot-peening, threads
special baked-on dry film lubricant (reduces possibility of
galling and assures consistent clamp loads), and double
Baked-on dry
magnaflux inspection. The head design fits the registers of all film lubricant
popular hubs without grinding, and studs are available in 31 Head fits
underhead lengths to provide you with the optimum thread all popular
hubs
engagement for your particular setup. The finest studs avail-
able! Available in 5-piece packs
Custom sizes available

L1 - Thread Length L2 - UHL L3 - Knurl Length Part No.

FINE THREAD (THREAD: 5/8-18, KNURL DIAMETER: 0.660)

1.600 2.450 0.500 300-7710 s

1.700 2.550 0.600 300-7711 s

1.750 2.600 0.650 300-7725 s

L1 - Thread Length L2 - UHL L3 - Knurl Length Part No.
1.800 2.650 0.700 300-7712 s
2.650 3.500 1.550 300-7731 s
1.850 2.700 0.750 300-7726 s
2.700 3.550 1.600 300-7719 s
1.900 2.750 0.675 300-7705 s
2.750 3.600 1.550 300-7709 s
1.950 2.800 0.850 300-7727 s
2.800 3.650 1.700 300-7720 s
2.000 2.850 0.900 300-7713 s
2.850 3.700 1.750 300-7732 s
2.050 2.900 0.825 300-7706 s
2.900 3.750 1.800 300-7721 s
2.100 2.950 1.000 300-7714 s
2.950 3.800 1.850 300-7733 s
2.150 3.000 1.050 300-7728 s
3.000 3.850 1.900 300-7722 s
2.200 3.050 1.100 300-7715 s
3.100 3.950 2.000 300-7723 s
2.250 3.100 1.150 300-7734 s
3.200 4.050 2.100 300-7724 s
2.300 3.150 1.200 300-7716 s
COARSE THREAD (THREAD: 5/8-11, KNURL DIAMETER: 0.685)
2.350 3.200 1.250 300-7729 s
1.900 2.650 0.500 300-7806* s
2.400 3.250 1.200 300-7707 s
1.850 2.650 0.950 300-7803* s
2.450 3.300 1.350 300-7730 s
3.220 4.031 0.750 300-7804* s
2.500 3.350 1.400 300-7717 s
* These kits have black oxide finish.
2.550 3.400 1.350 300-7708 s NOTE: All Speed Stud™ applications fit Stock Car Products and Speedway
Engineering Hubs without grinding or modifications.
2.600 3.450 1.500 300-7718 s NOTE: The products listed in this section have been designed to comply
with NASCAR® rules. No specific endorsement by NASCAR® is implied.
133
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CIRCLE TRACK
190,000 PSI tensile strength

Baked-on dry
film lubricant

Nut face profile

Speed Nuts ™ radiused

Designed for professional racing environments where

split-second improvements in pit stop times can make
the winning difference, and “unbustable” reliability is
an absolute must. ARP’s Speed Nuts feature a profiled
nut face for easy installation, quicker socket releases
Application Thread Part No.
and resistance to jamming. They’re made from premi-
um heat-treated chrome moly that’s nominally rated at NASCAR, 10-piece, fine 5/8-18 300-7801 s
190,000 psi tensile strength, shot-peened to remove IMCA Wide 5, 10-piece, coarse 5/8-11 300-7802 s
stress risers and double magnafluxed after heat-treating
and thread-forming to assure 100% metallurgical integri-
ty. Coated with Alumotef III gold coating. Speed Nuts are
ready for “instant” use (thread chasing not required).

Drilled for safety wire

Intake Manifold Bolts

Not only will these premium quality ARP fasteners Application Part No.
help prevent intake manifold leaks, but one is drilled
CHEVROLET
to allow for a seal wire. What’s more, they’re nominal-
ly rated at 180,000 psi and feature precision rolled SB 2, drilled 334-2104 l
threads for optimum engagement, to prevent galling SB 2, tall deck 334-2105 l
and promote more consistent torque loading. Wide
Small block, 1.000˝, drilled 334-2102 l
underhead flange design and companion flat washers
provide even load distribution and facilitates optimum Small block, 1.250˝, drilled 334-2103 l
sealing of gasket surfaces. Made of corrosion resistant V6 Chevy 90°, 1.000˝, drilled 333-2101 l
stainless steel. Washers included and bolt drilled for
FORD
NASCAR inspector’s wire seal.
SVO 351 cid, Jack Roush design, drilled 354-2102 l

134
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CIRCLE TRACK
Drilled Carburetor Studs
The best way to make sure that carburetors stay perfectly sealed to the intake manifold is through the
use of ARP’s carb studs, which feature J-form threads to resist loosening from vibration. They’re of-
fered in a variety of heights to accommodate most any combination of carb and spacer, and are avail-
able in 8740 chrome moly with a black oxide finish. Special NASCAR type studs have one of the studs
drilled to facilitate sealing the carb by race officials. All carb studs include a nut starter nose (except
where noted) and kits come with hex nuts and washers.

Application Pieces OAL Part No.

Standard, drilled for NASCAR wire seal 4 1.700 300-2401 l

Standard with Moroso #64919 return spring kit 4 1.700 (2) & 2.050 (2) 300-2421 l

Standard with Moroso #64927 return spring kit 4 1.700 (3) & 2.050 (1) 300-2424 l

1/2˝ spacer, drilled for NASCAR wire seal 4 2.225 300-2402 l

1˝ spacer, drilled for NASCAR wire seal 4 2.700 300-2403 l

2˝ spacer, drilled for NASCAR wire seal 4 3.700 300-2404 l

2˝ spacer, drilled for NASCAR wire seal 8 1.700 (7) & 2.225 (1) 300-2406 l

1˝ Moroso spacer, drilled for NASCAR wire seal 4 2.700 300-2407 l

1˝ spacer with Moroso #64919 return spring kit 4 1.700 (2) & 2.050 (2) 300-2420 l

1˝ spacer with Moroso #64927 return spring kit 4 1.700 (3) & 2.050 (1) 300-2423 l

1-1/4˝ Moroso spacer, drilled for NASCAR wire seal 4 3.200 300-2408 l

2˝ Moroso spacer, drilled for NASCAR wire seal 8 1.250* (4) & 1.700 (1) & 1.700 (3) 300-2409 l
2˝ Moroso spacer with Moroso #64919 return spring 8 1.250* (4) & 1.700 (2) & 2.050 (2) 300-2419 l
kit
2˝ Moroso spacer with Moroso #64927 return spring 8 1.250* (4) & 1.700 (3) & 2.050 (1) 300-2422 l
kit
*Does not have nut starter nose

Alternator Studs
Strange as it may seem, there have been many races lost in oval track, off-road and endurance com-
petition due to the OEM alternator stud failing and the subsequent loss of electrical power. To pre-
vent this from ever happening, conscientious engine builders rely on ARP’s “bulletproof” alternator
studs. They’re made from a premium grade 8740 chrome moly steel alloy and heat treated to a nom-
inal 190,000 psi tensile strength. They are very
rigid and won’t bend under the stress of compe- Coarse Fine
tition, eliminating problems with alternator pulley Description OAL Thread Thread Part No.
Length Length
alignment. Here’s more reliable “insurance” from
7/16 stud 5.000 1.000 1.000 300-0501 s
the innovators at ARP. Available in 5.000˝ and
5.250˝ lengths. Includes a 12-point nut and flat 7/16 stud 5.250 1.000 1.000 300-0502 s
washer.

135
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 CIRCLE TRACK
Drilled Header Bolts
ARP offers special NASCAR header bolts that have been drilled for use of
Drilled for safety wire. They are made from heat-treated 8740 chrome moly steel with
safety wire
a black oxide finish or Stainless steel that is polished to a bright shine. Both
materials are nominally rated at 180,000 psi tensile strength – considerably
stronger than Grade 8 hardware, and engineered to provide complete reli-
ability in the most severe racing environments. They are available in hex or
12-point heads. Through use of safety wire, exhaust headers will maintain
original tightness and can’t back off!

Black Oxide Stainless

Application Qty Dia. UHL Wrenching
Hex 12-Point Hex 12-Point
CHEVROLET

Chevy small block, drilled 12 3/8 0.750 3/8 100-1103 s 100-1203 l 400-1103 l 400-1203 l

Chevy big block, drilled 16 3/8 0.875 3/8 400-1104 l 400-1204 l

UNIVERSAL

Universal, drilled 16 3/8 0.750 3/8 400-1105 l 400-1205 l

Universal, drilled 12 3/8 0.875 3/8 400-1106 l 400-1206 l

Front Mandrel Bolts

Thread
Diameter Length Socket Size Head Style Part No.
Length
CHEVROLET

7/16 6.000 1.100 1/2 12-point 330-0701 s

1/2 6.000 1.100 9/16 12-point 330-0702 s

7/16 6.250 1.150 9/16 12-point 330-0703 s

1/2 4.000 0.750 15/16 Hex 330-0704 l

Get maximum reliability through the use of 1/2 4.000 0.625 15/16 Hex 330-0705 l
ARP’s rugged 8740 chrome moly steel front 1/2 3.750 0.625 15/16 Hex 330-0706 l
mandrel bolts. They’re undercut to provide the
1/2 3.250 0.750 15/16 Hex 330-0707 l
required stretch, shot-peened for extra durabil-
ity and designed for full thread engagement. 7/16 5.000 1.000 1/2 12-point 330-0708 s
Nominally rated at 190,000 psi tensile strength 7/16 5.500 1.000 1/2 12-point 330-0709 s
for durability you can count on! Available for
FORD
GM and Ford applications.
5/8 8.000 1.100 15/16 Hex 350-0701 l

5/8 8.375 1.000 15/16 Hex 350-0702 l

5/8 7.000 1.000 15/16 Hex 350-0703 l

136
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL

ARP Diesel
It’s a proven fact that OEM head bolts are the weak link in a diesel engine; especially if the engine has
been modified. That’s because Chevy Duramax, Dodge/Cummins and Ford Power Stroke engines are
all assembled using “Torque To Yield” (TTY) bolts and preloaded to yield and beyond (typically 100-
110%). Any increases in combustion pressure can lead to problems like blown head gaskets or cata-
strophic engine failure. And because TTY bolts are yielded by design, they should never be re-used.

ARP solves the problem by offering stronger head studs that are designed for higher clamping loads.
They are available in several different strength materials to safely handle applications from perfor-
mance street to all-out competition.

Similar improvements over factory TTY bolts are provided by high strength ARP main studs. And
there’s more. With increased performance you need the extra security that ARP flywheel and flexplate
bolts can provide.

Given the growth in extreme diesel competition and street add-ons, ARP is continually developing
additional diesel kits. Please check our dedicated diesel site – ARPdiesel.com for the latest announce-
ments and new kit information.

137
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL HEADS

Head Studs
Application Part No. Application Part No.

6.6L Duramax (2001 & later) LB7/LLY/LBZ/LML/LMM

CATERPILLAR 230-4201 s
ARP2000

6.6L Duramax (2001 & later) LB7/LLY/LBZ/LML/LMM

C15 238-4201 s Custom Age 625+ 230-4202 s

CUMMINS 6.6L Duramax (2017-2019) (L5P) ARP2000 230-4301 s

C8.3L 12V 1985-1990 12pt ARP2000 247-4209 s 6.6L Duramax (2017-2019) (L5P) Custom Age 625+ 230-4302 s

ISL 8.3/8.9L 12V 1990-1998 12pt ARP2000 247-4210 s DODGE/RAM

ISL 8.9L 24V 1999-2008 12pt ARP2000 247-4211 s 3.9L (4BT) Cummins ARP2000 247-4206 s

ISV5.0 ARP2000 247-4302 s 3.9L (4BT) Cummins Custom Age 625+ 247-4207 s

CHEVROLET/GMC 5.9L 12V Cummins (1989-98) ARP2000 247-4203 s

2.8L Duramax ARP2000 230-4203 s 5.9L 12V Cummins (1989-98) Custom Age 625+ 247-4205 s

6.2L GMC M12 130-4062 s 5.9L & 6.7L 24V Cummins (1998 & later) ARP2000 247-4202 s

138
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL HEADS, ROD BOLTS
Head Studs
Application Part No. Application Part No.

5.9L & 6.7L 24V Cummins (1998 & later), 247-4208 s 7.3L International (1988-94) ARP2000 250-4204 s
all same length studs ARP2000

5.9L & 6.7L 24V Cummins (1998 & later) Custom Age 247-4204 s 7.3L Power Stroke (1993-03) ARP2000 250-4201 s
625+

FORD NISSAN

6.0L Power Stroke ARP2000 - inner row M8 head bolts 250-4202 s 2.5L (YD25) 4-cylinder ARP2000 202-4306 s
sold separately

6.0L Power Stroke - inner row M8 head bolts 250-4206 s OLDSMOBILE

6.0L Power Stroke Custom Age 625+ - Inner row M8 250-4205 s 5.7L (350 cid) 184-4003 s
head bolts included

6.4L Power Stroke ARP2000 - Inner row M8 head bolts 250-4203 s VOLKSWAGEN/AUDI
included

6.7L Power Stroke ARP2000 250-4301 s 1.6L & 1.9L Turbo & Non-Turbo (1982-02) ARP2000 204-4706 s

6.7L Power Stroke Custom Age 625+ 250-4302 s

6.9L International 150-4069 s

Head Bolts
Application Part No. Application Part No.

CATERPILLAR CUMMINS

C15 238-4201 s Cummins ISF 2.8 ARP2000 247-3701 s

Rod Bolts
Application Part No. Application Part No.

CHEVROLET/GMC FORD

6.6L Duramax LB7/LLY/LBZ/LMM ARP2000 230-6301 l 6.0L & 6.4L Power Stroke ARP2000 250-6301 l

6.6L Duramax L5P 230-6301 l 7.3L Power Stroke PM rod (2001-2003) ARP2000 250-6302 l

DODGE/RAM 7.3L Power Stroke forged rod (1994-2000) 250-6303 l

3.9L (4BT) Cummins (Angled cap rod) ARP2000 247-6304 l NISSAN

5.9L 12V/24V Cummins ARP2000 247-6303 l 2.5L (YD25) 4-cylinder ARP2000 202-6008 l

139
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL MAINS, DAMPER
Main Studs
Application Part No. Application Part No.

CHEVROLET/GMC 5.9L 24V Dodge/Cummins (2004 & later) with factory 247-5403 l
block stiffener plate, 0.600˝ counter bore, 2 bolt
2.8L Duramax 230-5403 s 6.7L Dodge/Cummins (2007 & later) with factory block
stiffener plate, 2 bolt 247-5405 l
6.6L Duramax (2005 & earlier) LB7/LLY/L5P 230-5401 s
Dodge/Cummins 6.7L (2019 & later) ARP2000 247-5408 s
6.6L Duramax (2006 & later) LBZ/LMM 230-5402 s
FORD
CUMMINS
6.0L Power Stroke, 4 bolt 150-5801 l
Cummins ISL ARP2000 247-5406 s
6.4L Power Stroke, 4 bolt 150-5802 l
Cummins ISF2.8 ARP2000 247-5407 s
6.7L Power Stroke, 4 bolt ARP2000 250-5802 s
Cummins ISV5.0 ARP2000 247-5801 s
7.3L Power Stroke (1993-03), 4 bolt 250-5801 s
DODGE/RAM
NISSAN
Dodge/Cummins 3.9L 4BT, 2 bolt 247-5404 s
2.5L (YD25) 4-cylinder ARP2000 202-5803 s
5.9L 12V Cummins (1997 & earlier), 2 bolt 247-5402 s
OLDSMOBILE
5.9L 24V Dodge/Cummins 5.9L 24V Late ’97-’06, 2-bolt 247-5401 s
5.7L (350 cid) 184-5402 s

Harmonic Damper Kits

Application Part No.

Chevy 6.6L Duramax - bolt 129-2503 l

Chevy Duramax - washer 200-8793 s

Dodge/Ram 5.9L 12V/24V Cummins (2007 & earlier) - bolt & washer 147-2502 s

Dodge/Ram 5.9L & 6.7L 24V Cummins (2008 & later) - bolt & washer 147-2503 s

Ford 6.0L & 6.4L Power Stroke - bolt & washer 150-2505 s

Ford 6.7L Power Stroke - bolt & washer 150-2504 s

140
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL EXHAUST, VALVE COVER
Exhaust Fastener Kits
ARP Stainless
ARP Stainless Bolts Studs
Application
12 Pt Hex 12 Pt

CHEVROLET/GMC

OE exhaust manifold 430-1201 l 430-1101 l 430-1301 l

Duramax 6.6 L (2001-2016)
aftermarket exhaust manifolds 430-1202 l 430-1102 l 430-1303 l

DODGE/RAM

OE exhaust manifold, spacers not included, cannot use OE heat 447-1201 l 447-1101 l
shield
OE exhaust manifold, spacers not included, can use OE heat shield 447-1301 l

Cummins 5.9/6.7L OE exhaust manifold, spacers included, cannot use OE heat shield 447-1202 l 447-1102 l

OE exhaust manifold, spacers included, can use OE heat shield 447-1303 l

aftermarket exhaust manifold 447-1203 l 447-1103 l 447-1305 l

FORD

OE exhaust manifold, spacers not included 450-1202 l 450-1102 l 450-1303 l

Power Stroke 6.0L OE exhaust manifold, spacers included 450-1203 l 450-1103 l 450-1305 l
(2003-2007)
aftermarket exhaust manifold 450-1204 l 450-1104 l 450-1307 l

OE exhaust manifold, spacers not included 450-1309 l

Power Stroke 6.7L (2011 &
later)
OE exhaust manifold, spacers included 450-1311 l

Power Stroke 7.3L (1994- OE exhaust manifold 450-1201 l 450-1101 l 450-1301 l

2003)

Valve Cover Bolts

Application Hex 12-Point Application Hex 12-Point
6.6L Duramax LBZ/LLY/LML/LMM
CHEVROLET/GMC 100-7534 s 100-7533 s
(Black oxide)

6.6L Duramax LB7 (Black oxide) 100-7532 s 100-7531 s 6.6L Duramax LBZ/LLY/LML/LMM (Stainless) 400-7534 l 400-7533 l

6.6L Duramax LB7 (Stainless) 400-7532 l 400-7531 l

141
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 DIESEL FLYWHEEL, PEDESTAL
Flywheel & Flexplate Bolts
Application UHL Thread Size Part No.

FLYWHEEL BOLTS

Chevy/GMC 6.6L Duramax 1.600 M16 x 1.5 230-2801 l

Dodge/Ram 5.9L 12V/24V Cummins (2004 & earlier) 1.250 M12 x 1.25 147-2802 s

6.0L & 6.4L Power Stroke (single mass flywheel) 2.015 M10 x1.0 150-2802 s

Ford 6.4L Power Stroke Crank flange adapter bolt kit 2.425 M12 x 1.25 150-2506 l

Ford 6.7L Power Stroke 1.825 M12 x 1.5 150-2801 s

FLEXPLATE BOLTS

Chevy/GMC 6.6L Duramax 1.775 M16 x 1.5 230-2901 l

Dodge/Ram 5.9L 12V & 24V Cummins 0.700 M12 x 1.25 147-2901 l

Ford 6.0L & 6.4L Power Stroke 1.275 M10 x 1.0 150-2902 s

Ford 6.7L Power Stroke 1.825 M12 x 1.5 150-2901 s

Rocker Pedestal Stud Kit

Application Part No.
Dodge Cummins 24V, 12pt 247-7201 l

Ring Compressors
Size Part No. Size Part No. Size Part No. Size Part No.

3.740 899-7400 s 4.070 900-0700 s 4.130 900-1300 s 4.210 900-2100 s

3.750 899-7500 s 4.075 900-0750 s 4.140 900-1400 s 4.212 900-2125 s

3.760 899-7600 s 4.080 900-0800 s 4.155 900-1550 s

4.060 900-0600 s 4.090 900-0900 s 4.200 900-2000 s

*see our full line of ring compressors on page 175

ARP is proud to sponsor these fine diesel performance series

142
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 POWERSPORTS
ARP Powersports

Motorcycles, XTVs, high speed carts and water- Given the extreme enthusiam in the powersports
craft run at very high rpms and put tremendous market and newly developed power enhance-
stress on light-weight parts. ARP fasteners are up ments for these applications, ARP is continualy
to the challenge. developing additional powersports kits. Please
check our dedicated website – ARPpowersports.
com for the latest announcements and new kit
Rod Bolts information.

Application Part No.

BMW S1000RR Motorcycle 201-6202 l

Main Bolts
Sea-Doo/Rotax RXP-X255 168-6001 l

Suzuki GSX 1300 Hayabusa 271-6301 l Application Part No.

Triumph Bonneville 650cc motorcycle (1956-72) 206-6009 l BMW S1000RR Motorcycle 201-5201 l

Head Studs Main Studs

Application Part No. Application Part No.
BMW S1000RR Motorcycle 201-4306 l Honda CBR 1000RR Motorcycle 208-5405 s
Polaris RZR 1000 ARP2000 288-4701 l Polaris RZR 1000 188-5401 s
Sea-Doo/Rotax RXP-X255 168-4201 l Sea-Doo/Rotax RXP-X255 168-5501 s
Suzuki GSX 1300 Hayabusa 271-4701 l Suzuki GSX 1300 Hayabusa 271-5401 s

Head Bolts Engine & Accessory

Application Part No.
Application Part No.
Harley Davidson - (1948-84) all Pan heads and Shovel 460-3601 l Suzuki GSX 1300 Hayabusa - case half bolt kit 471-9501 l
heads
Harley Davidson - (1953-73) XL’s 460-3602 l Suzuki GSX 1300 Hayabusa - accessory bolt kit 571-9501 l

143
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK5-PACKS
BOLT FASTENERS
Stainless Steel & Chrome Moly
5-packs with Washers

Stainless Steel & Chrome Moly Bolts

Available in Standard Sizes From #10 to 1/2˝

and Metric Sizes From M6 to M12

With Underhead Lengths Ranging

From 1/2˝ to 6˝. Hex or 12-Pt. Heads.

Packaged In Convenient 5-Pack Cards.

NOTE: Packed 5 on a card with washers

Now you can use premium quality ARP stainless steel or chrome moly fasteners to install most any-
thing on a car, boat or trailer. ARP’s specially alloyed stainless steel bolts and heat-treated 8740
chrome moly bolts with black oxide finish are nominally rated at 180,000 psi tensile strength to pro-
vide a substantial extra margin of safety over Grade 8 hardware.

What’s more, you can’t beat the gorgeous looks of ARP’s specially polished stainless steel fasteners,
and their ability to resist rust. They’re truly maintenance free!

You can get 5-packs of any diameter bolt from #10 to 1/2˝ or M6 to M12 in lengths ranging from 1/2˝
to 6˝ in your choice of hex or 12-point heads with washers included. Matching nuts are also available
(see pages 161-163).
144
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK
10-24 & 10-32 FASTENERS
BOLT 5-PACKS
➍ ➏

➎
➋ ➌
➊ ➐ ➑
* threaded all the way to head

➍ ➏

➎
➋ ➌
➊ ➐ ➑
* threaded all the way to head

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

10-24 0.500 0.500 n/a * 701-0500 l

➍ 0.190˝ thread diameter
24 threads / inch 0.625 0.625 n/a * 701-0625 l
➎ n/a threaded to head
➏ 1/4˝ wrenching 0.750 0.750 n/a * 701-0750 l

➐ 0.260˝ head height

1.000 01.000 n/a * 701-1000 l
➑ 0.365˝ collar diameter

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

10-32 0.500 0.500 n/a * 702-0500 l

➍ 0.190˝ thread diameter
32 threads / inch 0.625 0.625 n/a * 702-0625 l
➎ n/a threaded to head
➏ 1/4˝ wrenching 0.750 0.750 n/a * 702-0750 l

➐ 0.260˝ head height

1.000 1.000 n/a * 702-1000 l
➑ 0.365˝ collar diameter

145
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
1/4-20 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.515 0.515 n/a * 650-0515 s 640-0515 s 621-0515 l 611-0515 l

0.625 0.625 n/a * 650-0625 s 640-0625 s 621-0625 l 611-0625 l

0.750 0.750 n/a * 650-0750 s 640-0750 s 621-0750 l 611-0750 l

0.875 0.875 n/a * 650-0875 s 640-0875 s 621-0875 l 611-0875 l

1.000 1.000 n/a * 650-1000 s 640-1000 s 621-1000 l 611-1000 l

1.125 1.000 0.125 650-1125 s 640-1125 s 621-1125 l 611-1125 l

1.250 1.000 0.250 650-1250 s 640-1250 s 621-1250 l 611-1250 l

1.375 1.000 0.375 650-1375 s 640-1375 s 621-1375 l 611-1375 l

1.500 1.000 0.500 650-1500 s 640-1500 s 621-1500 l 611-1500 l

1.625 1.000 0.625 650-1625 s 640-1625 s 621-1625 l 611-1625 l

1.750 1.000 0.750 650-1750 s 640-1750 s 621-1750 l 611-1750 l

1.875 1.000 0.875 650-1875 s 640-1875 s 621-1875 l 611-1875 l

2.000 1.000 1.000 650-2000 s 640-2000 s 621-2000 l 611-2000 l

2.125 1.000 1.125 650-2125 s 640-2125 s 621-2125 l 611-2125 l

1⁄4-20 2.250 1.000 1.250 650-2250 s 640-2250 s 621-2250 l 611-2250 l

2.375 1.000 1.375 650-2375 s 640-2375 s 621-2375 l 611-2375 l

➍ 1/4˝ thread diameter
20 threads per inch 2.500 1.000 1.500 650-2500 s 640-2500 s 621-2500 l 611-2500 l

➎ 1/4˝ grip diameter 2.625 1.000 1.625 650-2625 s 640-2625 s 621-2625 l 611-2625 l

2.750 1.000 1.750 650-2750 s 640-2750 s 621-2750 l 611-2750 l

➏ 5/16˝ wrenching
2.875 1.000 1.875 650-2875 s 640-2875 s 621-2875 l 611-2875 l
➐ 0.255˝ head height
3.000 1.000 2.000 650-3000 s 640-3000 s 621-3000 l 611-3000 l
➑ 0.515˝ collar diameter
3.125 1.000 2.125 650-3125 s 640-3125 s 621-3125 l 611-3125 l

3.250 1.000 2.250 650-3250 s 640-3250 s 621-3250 l 611-3250 l

3.375 1.000 2.375 650-3375 s 640-3375 s 621-3375 l 611-3375 l

3.500 1.000 2.500 650-3500 s 640-3500 s 621-3500 l 611-3500 l

3.625 1.000 2.625 650-3625 s 640-3625 s 621-3625 l 611-3625 l

3.750 1.000 2.750 650-3750 s 640-3750 s 621-3750 l 611-3750 l

3.875 1.000 2.875 650-3875 s 640-3875 s 621-3875 l 611-3875 l

4.000 1.000 3.000 650-4000 s 640-4000 s 621-4000 l 611-4000 l

4.125 1.000 3.125 611-4125 l

4.250 1.000 3.250 650-4250 s 640-4250 s 621-4250 l 611-4250 l

4.375 1.000 3.375 611-4375 l

4.500 1.000 3.500 650-4500 s 640-4500 s 621-4500 l 611-4500 l

4.625 1.000 3.625 611-4625 l

4.750 1.000 3.750 650-4750 s 640-4750 s 621-4750 l 611-4750 l

146
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 1/4-28
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.515 0.515 n/a * 750-0515 s 740-0515 s 721-0515 l 711-0515 l

0.625 0.625 n/a * 750-0625 s 740-0625 s 721-0625 l 711-0625 l

0.750 0.750 n/a * 750-0750 s 740-0750 s 721-0750 l 711-0750 l

0.875 0.875 n/a * 750-0875 s 740-0875 s 721-0875 l 711-0875 l

1.000 1.000 n/a * 750-1000 s 740-1000 s 721-1000 l 711-1000 l

1.125 1.000 0.125 750-1125 s 740-1125 s 721-1125 l 711-1125 l

1.250 1.000 0.250 750-1250 s 740-1250 s 721-1250 l 711-1250 l

1.375 1.000 0.375 750-1375 s 740-1375 s 721-1375 l 711-1375 l

1.500 1.000 0.500 750-1500 s 740-1500 s 721-1500 l 711-1500 l

1.625 1.000 0.625 750-1625 s 740-1625 s 721-1625 l 711-1625 l

1.750 1.000 0.750 750-1750 s 740-1750 s 721-1750 l 711-1750 l

1.875 1.000 0.875 750-1875 s 740-1875 s 721-1875 l 711-1875 l

2.000 1.000 1.000 750-2000 s 740-2000 s 721-2000 l 711-2000 l

1⁄4-28 2.125 1.000 1.125 750-2125 s 740-2125 s 721-2125 l 711-2125 l

2.250 1.000 1.250 750-2250 s 740-2250 s 721-2250 l 711-2250 l

➍ 1/4˝ thread diameter
28 threads per inch 2.375 1.000 1.375 750-2375 s 740-2375 s 721-2375 l 711-2375 l

➎ 1/4˝ grip diameter 2.500 1.000 1.500 750-2500 s 740-2500 s 721-2500 l 711-2500 l

2.625 1.000 1.625 750-2625 s 740-2625 s 721-2625 l 711-2625 l

➏ 5/16˝ wrenching
2.750 1.000 1.750 750-2750 s 740-2750 s 721-2750 l 711-2750 l
➐ 0.255˝ head height
2.875 1.000 1.875 750-2875 s 740-2875 s 721-2875 l 711-2875 l
➑ 0.515˝ collar diameter
3.000 1.000 2.000 750-3000 s 740-3000 s 721-3000 l 711-3000 l

3.125 1.000 2.125 750-3125 s 740-3125 s 721-3125 l 711-3125 l

3.250 1.000 2.250 750-3250 s 740-3250 s 721-3250 l 711-3250 l

3.375 1.000 2.375 750-3375 s 740-3375 s 721-3375 l 711-3375 l

3.500 1.000 2.500 750-3500 s 740-3500 s 721-3500 l 711-3500 l

3.625 1.000 2.625 750-3625 s 740-3625 s 721-3625 l 711-3625 l

3.750 1.000 2.750 750-3750 s 740-3750 s 721-3750 l 711-3750 l

3.875 1.000 2.875 750-3875 s 740-3825 s 721-3875 l 711-3875 l

4.000 1.000 3.000 750-4000 s 740-4000 s 721-4000 l 711-4000 l

4.125 1.000 3.125 711-4125 l

4.250 1.000 3.250 750-4250 s 740-4250 s 721-4250 l 711-4250 l

4.375 1.000 3.375 711-4375 l

4.500 1.000 3.500 750-4500 s 740-4500 s 721-4500 l 711-4500 l

4.625 1.000 3.625 711-4625 l

4.750 1.000 3.750 750-4750 s 740-4750 s 721-4750 l 711-4750 l

147
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
5/16-18 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.560 0.560 n/a * 651-0560 s 641-0560 s 622-0560 l 612-0560 l

0.625 0.625 n/a * 651-0625 s 641-0625 s 622-0625 l 612-0625 l

0.750 0.750 n/a * 651-0750 s 641-0750 s 622-0750 l 612-0750 l

0.875 0.875 n/a * 651-0875 s 641-0875 s 622-0875 l 612-0875 l

1.000 1.000 n/a * 651-1000 s 641-1000 s 622-1000 l 612-1000 l

1.125 1.125 n/a * 651-1125 s 641-1125 s 622-1125 l 612-1125 l

1.250 1.250 n/a * 651-1250 s 641-1250 s 622-1250 l 612-1250 l

1.375 1.000 0.375 651-1375 s 641-1375 s 622-1375 l 612-1375 l

1.500 1.000 0.500 651-1500 s 641-1500 s 622-1500 l 612-1500 l

1.625 1.000 0.625 651-1625 s 641-1625 s 622-1625 l 612-1625 l

1.750 1.000 0.750 651-1750 s 641-1750 s 622-1750 l 612-1750 l

1.875 1.000 0.750 651-1875 s 641-1875 s 622-1875 l 612-1875 l

2.000 1.000 1.000 651-2000 s 641-2000 s 622-2000 l 612-2000 l

2.125 1.000 1.125 651-2125 s 641-2125 s 622-2125 l 612-2125 l

2.250 1.000 1.250 651-2250 s 641-2250 s 622-2250 l 612-2250 l

5⁄16-18
2.375 1.000 1.375 651-2375 s 641-2375 s 622-2375 l 612-2375 l

➍ 5/16˝ thread diameter 2.500 1.000 1.500 651-2500 s 641-2500 s 622-2500 l 612-2500 l
18 threads per inch 2.625 1.000 1.625 651-2625 s 641-2625 s 622-2625 l 612-2625 l

➎ 5/16˝ grip diameter 2.750 1.000 1.750 651-2750 s 641-2750 s 622-2750 l 612-2750 l

2.875 1.000 1.875 651-2875 s 641-2875 s 622-2875 l 612-2875 l

➏ 3/8˝ wrenching
3.000 1.000 2.000 651-3000 s 641-3000 s 622-3000 l 612-3000 l
➐ 0.300˝ head height
3.125 1.000 2.125 651-3125 s 641-3125 s 622-3125 l 612-3125 l
➑ 0.620˝ collar diameter 3.250 1.000 2.250 651-3250 s 641-3250 s 622-3250 l 612-3250 l

3.375 1.000 2.375 651-3375 s 641-3375 s 622-3375 l 612-3375 l

3.500 1.000 2.500 651-3500 s 641-3500 s 622-3500 l 612-3500 l

3.625 1.000 2.625 651-3625 s 641-3625 s 622-3625 l 612-3625 l

3.750 1.000 2.750 651-3750 s 641-3750 s 622-3750 l 612-3750 l

3.875 1.000 2.875 651-3875 s 641-3875 s 622-3875 l 612-3875 l

4.000 1.000 3.000 651-4000 s 641-4000 s 622-4000 l 612-4000 l

4.125 1.000 3.125 622-4125 l 612-4125 l

4.250 1.000 3.250 651-4250 s 641-4250 s 622-4250 l 612-4250 l

4.375 1.000 3.375 622-4375 l 612-4375 l

4.500 1.000 3.500 651-4500 s 641-4500 s 622-4500 l 612-4500 l

4.625 1.000 3.625 622-4625 l 612-4625 l

4.750 1.000 3.750 651-4750 s 641-4750 s 622-4750 l 612-4750 l

4.875 1.000 3.875 622-4875 l 612-4875 l

5.000 1.000 4.000 651-5000 s 641-5000 s 622-5000 l 612-5000 l

148
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 5/16-24
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.560 0.560 n/a * 751-0560 s 741-0560 s 722-0560 l 712-0560 l

0.625 0.625 n/a * 751-0625 s 741-0625 s 722-0625 l 712-0625 l

0.750 0.750 n/a * 751-0750 s 741-0750 s 722-0750 l 712-0750 l

0.875 0.875 n/a * 751-0875 s 741-0875 s 722-0875 l 712-0875 l

1.000 1.000 n/a * 751-1000 s 741-1000 s 722-1000 l 712-1000 l

1.125 1.125 n/a * 751-1125 s 741-1125 s 722-1125 l 712-1125 l

1.250 1.250 n/a * 751-1250 s 741-1250 s 722-1250 l 712-1250 l

1.375 1.000 0.375 751-1375 s 741-1375 s 722-1375 l 712-1375 l

1.500 1.000 0.500 751-1500 s 741-1500 s 722-1500 l 712-1500 l

1.625 1.000 0.625 751-1625 s 741-1625 s 722-1625 l 712-1625 l

1.750 1.000 0.750 751-1750 s 741-1750 s 722-1750 l 712-1750 l

1.875 1.000 0.750 751-1875 s 741-1875 s 722-1875 l 712-1875 l

2.000 1.000 1.000 751-2000 s 741-2000 s 722-2000 l 712-2000 l

2.125 1.000 1.125 751-2125 s 741-2125 s 722-2125 l 712-2125 l

2.250 1.000 1.250 751-2250 s 741-2250 s 722-2250 l 712-2250 l

5⁄16-24
2.375 1.000 1.375 751-2375 s 741-2375 s 722-2375 l 712-2375 l

➍ 5/16˝ thread diameter 2.500 1.000 1.500 751-2500 s 741-2500 s 722-2500 l 712-2500 l
24 threads per inch 2.625 1.000 1.625 751-2625 s 741-2625 s 722-2625 l 712-2625 l

➎ 5/16˝ grip diameter 2.750 1.000 1.750 751-2750 s 741-2750 s 722-2750 l 712-2750 l

2.875 1.000 1.875 751-2875 s 741-2875 s 722-2875 l 712-2875 l

➏ 3/8˝ wrenching
3.000 1.000 2.000 751-3000 s 741-3000 s 722-3000 l 712-3000 l
➐ 0.300˝ head height
3.125 1.000 2.125 751-3125 s 741-3125 s 722-3125 l 712-3125 l
➑ 0.620˝ collar diameter 3.250 1.000 2.250 751-3250 s 741-3250 s 722-3250 l 712-3250 l

3.375 1.000 2.375 751-3375 s 741-3375 s 722-3375 l 712-3375 l

3.500 1.000 2.500 751-3500 s 741-3500 s 722-3500 l 712-3500 l

3.625 1.000 2.625 751-3625 s 741-3625 s 722-3625 l 712-3625 l

3.750 1.000 2.750 751-3750 s 741-3750 s 722-3750 l 712-3750 l

3.875 1.000 2.875 751-3875 s 741-3875 s 722-3875 l 712-3875 l

4.000 1.000 3.000 751-4000 s 741-4000 s 722-4000 l 712-4000 l

4.125 1.000 3.125 751-4125 s 741-4125 s 712-4125 l

4.250 1.000 3.250 751-4250 s 741-4250 s 722-4250 l 712-4250 l

4.375 1.000 3.375 751-4375 s 741-4375 s 712-4375 l

4.500 1.000 3.500 751-4500 s 741-4500 s 722-4500 l 712-4500 l

4.625 1.000 3.625 751-4625 s 741-4625 s 712-4625 l

4.750 1.000 3.750 751-4750 s 741-4750 s 722-4750 l 712-4750 l

4.875 1.000 3.875 751-4875 s 741-4875 s 712-4875 l

5.000 1.000 4.000 751-5000 s 741-5000 s 722-5000 l 712-5000 l

149
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
3/8-16 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.500 0.500 n/a * 652-0500 s 642-0500 s 623-0500 l 613-0500 l

0.750 0.750 n/a * 652-0750 s 642-0750 s 623-0750 l 613-0750 l

1.000 1.000 n/a * 652-1000 s 642-1000 s 623-1000 l 613-1000 l

1.250 1.250 n/a * 652-1250 s 642-1250 s 623-1250 l 613-1250 l

3⁄ 8-16 1.500 1.100 0.400 652-1500 s 642-1500 s 623-1500 l 613-1500 l

1.750 1.100 0.650 652-1750 s 642-1750 s 623-1750 l 613-1750 l

Reduced Wrenching 2.000 1.100 0.900 652-2000 s 642-2000 s 623-2000 l 613-2000 l

2.250 1.100 1.150 652-2250 s 642-2250 s 623-2250 l 613-2250 l

➍ 3/8˝ thread diameter
16 threads per inch 2.500 1.100 1.400 652-2500 s 642-2500 s 623-2500 l 613-2500 l

2.750 1.100 1.650 652-2750 s 642-2750 s 623-2750 l 613-2750 l

➎ 3/8˝ grip diameter
3.000 1.100 1.900 652-3000 s 642-3000 s 623-3000 l 613-3000 l
➏ 3/8˝ wrenching
3.250 1.100 2.150 652-3250 s 642-3250 s 623-3250 l 613-3250 l
➐ 0.300˝ head height
3.500 1.100 2.400 652-3500 s 642-3500 s 623-3500 l 613-3500 l
➑ 0.620˝ collar diameter 3.750 1.100 2.650 652-3750 s 642-3750 s 623-3750 l 613-3750 l

reduced wrenching and collar diameter 4.000 1.100 2.900 652-4000 s 642-4000 s 623-4000 l 613-4000 l
for tight clearance applications
4.250 1.100 3.150 652-4250 s 642-4250 s 623-4250 l 613-4250 l

4.500 1.100 3.400 652-4500 s 642-4500 s 623-4500 l 613-4500 l

4.750 1.100 3.650 652-4750 s 642-4750 s 623-4750 l 613-4750 l

5.000 1.100 3.900 652-5000 s 642-5000 s 623-5000 l 613-5000 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.750 0.750 n/a * 654-0750 s 644-0750 s 625-0750 l 615-0750 l

1.000 1.000 n/a * 654-1000 s 644-1000 s 625-1000 l 615-1000 l

3 ⁄ 8-16 1.250 1.250 n/a * 654-1250 s 644-1250 s 625-1250 l 615-1250 l

1.500 1.100 n/a * 654-1500 s 644-1500 s 625-1500 l 615-1500 l

Standard Wrenching 1.750 1.100 0.650 654-1750 s 644-1750 s 625-1750 l 615-1750 l

2.000 1.100 0.900 654-2000 s 644-2000 s 625-2000 l 615-2000 l

➍ 3/8˝ thread diameter 2.250 1.100 1.150 654-2250 s 644-2250 s 625-2250 l 615-2250 l
16 threads per inch
2.500 1.100 1.400 654-2500 s 644-2500 s 625-2500 l 615-2500 l
➎ 3/8˝ grip diameter 2.750 1.100 1.650 654-2750 s 644-2750 s 625-2750 l 615-2750 l
➏ 7/16˝ wrenching 3.000 1.100 1.900 654-3000 s 644-3000 s 625-3000 l 615-3000 l

➐ 0.360˝ head height 3.250 1.100 2.150 654-3250 s 644-3250 s 625-3250 l 615-3250 l

➑ 0.700˝ collar diameter 3.500 1.100 2.400 654-3500 s 644-3500 s 625-3500 l 615-3500 l

3.750 1.100 2.650 654-3750 s 644-3750 s 625-3750 l 615-3750 l

4.000 1.100 2.900 654-4000 s 644-4000 s 625-4000 l 615-4000 l

150
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 3/8-24
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.500 0.500 n/a * 752-0500 s 742-0500 s 723-0500 l 713-0500 l

0.750 0.750 n/a * 752-0750 s 742-0750 s 723-0750 l 713-0750 l

1.000 1.000 n/a * 752-1000 s 742-1000 s 723-1000 l 713-1000 l

1.250 1.250 n/a * 752-1250 s 742-1250 s 723-1250 l 713-1250 l

3⁄ 8-24 1.500 1.100 0.400 752-1500 s 742-1500 s 723-1500 l 713-1500 l

1.750 1.100 0.650 752-1750 s 742-1750 s 723-1750 l 713-1750 l

Reduced Wrenching 2.000 1.100 0.900 752-2000 s 742-2000 s 723-2000 l 713-2000 l

2.250 1.100 1.150 752-2250 s 742-2250 s 723-2250 l 713-2250 l

➍ 3/8˝ thread diameter
24 threads per inch 2.500 1.100 1.400 752-2500 s 742-2500 s 723-2500 l 713-2500 l

2.750 1.100 1.650 752-2750 s 742-2750 s 723-2750 l 713-2750 l

➎ 3/8˝ grip diameter
3.000 1.100 1.900 752-3000 s 742-3000 s 723-3000 l 713-3000 l
➏ 3/8˝ wrenching
3.250 1.100 2.150 752-3250 s 742-3250 s 723-3250 l 713-3250 l
➐ 0.300˝ head height
3.500 1.100 2.400 752-3500 s 742-3500 s 723-3500 l 713-3500 l
➑ 0.620˝ collar diameter 3.750 1.100 2.650 752-3750 s 742-3750 s 723-3750 l 713-3750 l

reduced wrenching and collar diameter 4.000 1.100 2.900 752-4000 s 742-4000 s 723-4000 l 713-4000 l
for tight clearance applications
4.250 1.100 3.150 752-4250 s 742-4250 s 723-4250 l 713-4250 l

4.500 1.100 3.400 752-4500 s 742-4500 s 723-4500 l 713-4500 l

4.750 1.100 3.650 752-4750 s 742-4750 s 723-4750 l 713-4750 l

5.000 1.100 3.900 752-5000 s 742-5000 s 723-5000 l 713-5000 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.750 0.750 n/a * 754-0750 s 744-0750 s 725-0750 l 715-0750 l

1.000 1.000 n/a * 754-1000 s 744-1000 s 725-1000 l 715-1000 l

3⁄ 8-24 1.250 1.250 n/a * 754-1250 s 744-1250 s 725-1250 l 715-1250 l

1.500 1.100 0.400 754-1500 s 744-1500 s 725-1500 l 715-1500 l

Standard Wrenching 1.750 1.100 0.650 754-1750 s 744-1750 s 725-1750 l 715-1750 l

2.000 1.100 0.900 754-2000 s 744-2000 s 725-2000 l 715-2000 l

➍ 3/8˝ thread diameter 2.250 1.100 1.150 754-2250 s 744-2250 s 725-2250 l 715-2250 l
24 threads per inch
2.500 1.100 1.400 754-2500 s 744-2500 s 725-2500 l 715-2500 l
➎ 3/8˝ grip diameter 2.750 1.100 1.650 754-2750 s 744-2750 s 725-2750 l 715-2750 l
➏ 7/16˝ wrenching 3.000 1.100 1.900 754-3000 s 744-3000 s 725-3000 l 715-3000 l

➐ 0.360˝ head height 3.250 1.100 2.150 754-3250 s 744-3250 s 725-3250 l 715-3250 l

➑ 0.700˝ collar diameter 3.500 1.100 2.400 754-3500 s 744-3500 s 725-3500 l 715-3500 l

3.750 1.100 2.650 754-3750 s 744-3750 s 725-3750 l 715-3750 l

4.000 1.100 2.900 754-4000 s 744-4000 s 725-4000 l 715-4000 l

151
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
7/16-14 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

1.500 1.250 0.250 653-1500 s 643-1500 s 626-1500 l 616-1500 l

1.750 1.250 0.500 653-1750 s 643-1750 s 626-1750 l 616-1750 l

7⁄16-14 2.000 1.250 0.750 653-2000 s 643-2000 s 626-2000 l 616-2000 l

2.250 1.250 1.000 653-2250 s 643-2250 s 626-2250 l 616-2250 l

Reduced Wrenching 2.500 1.250 1.250 653-2500 s 643-2500 s 626-2500 l 616-2500 l

2.750 1.250 1.500 653-2750 s 643-2750 s 626-2750 l 616-2750 l

➍ 7/16˝ thread diameter
14 threads per inch 3.000 1.250 1.750 653-3000 s 643-3000 s 626-3000 l 616-3000 l

3.250 1.250 2.000 653-3250 s 643-3250 s 626-3250 l 616-3250 l

➎ 7/16˝ grip diameter
3.500 1.250 2.250 653-3500 s 643-3500 s 626-3500 l 616-3500 l
➏ 7/16˝ wrenching
3.750 1.250 2.500 653-3750 s 643-3750 s 626-3750 l 616-3750 l
➐ 0.400˝ head height
4.000 1.250 2.750 653-4000 s 643-4000 s 626-4000 l 616-4000 l
➑ 0.670˝ collar diameter 4.250 1.250 3.000 653-4250 s 643-4250 s 626-4250 l 616-4250 l

reduced wrenching and collar diameter 4.500 1.250 3.250 653-4500 s 643-4500 s 626-4500 l 616-4500 l
for tight clearance applications
4.750 1.250 3.500 653-4750 s 643-4750 s 626-4750 l 616-4750 l

5.000 1.250 3.750 653-5000 s 643-5000 s 626-5000 l 616-5000 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

1.500 1.250 0.250 655-1500 s 645-1500 s 624-1500 l 614-1500 l

1.750 1.250 0.500 655-1750 s 645-1750 s 624-1750 l 614-1750 l

2.000 1.250 0.750 655-2000 s 645-2000 s 624-2000 l 614-2000 l

7⁄16-14
2.250 1.250 1.000 655-2250 s 645-2250 s 624-2250 l 614-2250 l

2.500 1.250 1.250 655-2500 s 645-2500 s 624-2500 l 614-2500 l

Standard Wrenching 2.750 1.250 1.500 655-2750 s 645-2750 s 624-2750 l 614-2750 l

3.000 1.250 1.750 655-3000 s 645-3000 s 624-3000 l 614-3000 l

➍ 7/16˝ thread diameter
14 threads per inch 3.250 1.250 2.000 655-3250 s 645-3250 s 624-3250 l 614-3250 l

3.500 1.250 2.250 655-3500 s 645-3500 s 624-3500 l 614-3500 l

➎ 7/16˝ grip diameter
3.750 1.250 2.500 655-3750 s 645-3750 s 624-3750 l 614-3750 l
➏ 1/2˝ wrenching
4.000 1.250 2.750 655-4000 s 645-4000 s 624-4000 l 614-4000 l
➐ 0.345˝ head height
4.250 1.250 3.000 655-4250 s 645-4250 s 624-4250 l 614-4250 l
➑ 0.740˝ collar diameter
4.500 1.250 3.250 655-4500 s 645-4500 s 624-4500 l 614-4500 l

4.750 1.250 3.500 655-4750 s 645-4750 s 624-4750 614-4750 l

5.000 1.250 3.750 655-5000 s 645-5000 s 624-5000 l 614-5000 l

152
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 7/16-20
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

1.000 1.000 n/a * 753-1000 s 743-1000 s 724-1000 l 714-1000 l

1.250 1.250 n/a * 753-1250 s 743-1250 s 724-1250 l 714-1250 l

1.500 1.250 0.250 753-1500 s 743-1500 s 724-1500 l 714-1500 l

7⁄16-20
1.750 1.250 0.500 753-1750 s 743-1750 s 724-1750 l 714-1750 l

2.000 1.250 0.750 753-2000 s 743-2000 s 724-2000 l 714-2000 l

Reduced Wrenching
2.250 1.250 1.000 753-2250 s 743-2250 s 724-2250 l 714-2250 l

2.500 1.250 1.250 753-2500 s 743-2500 s 724-2500 l 714-2500 l

➍ 7/16˝ thread diameter 2.750 1.250 1.500 753-2750 s 743-2750 s 724-2750 l 714-2750 l
20 threads per inch
3.000 1.250 1.750 753-3000 s 743-3000 s 724-3000 l 714-3000 l
➎ 7/16˝ grip diameter
3.250 1.250 2.000 753-3250 s 743-3250 s 724-3250 l 714-3250 l
➏ 7/16˝ wrenching 3.500 1.250 2.250 753-3500 s 743-3500 s 724-3500 l 714-3500 l
➐ 0.400˝ head height 3.750 1.250 2.500 753-3750 s 743-3750 s 724-3750 l 714-3750 l

➑ 0.670˝ collar diameter 4.000 1.250 2.750 753-4000 s 743-4000 s 724-4000 l 714-4000 l

4.250 1.250 3.000 753-4250 s 743-4250 s 724-4250 l 714-4250 l

reduced wrenching and collar diameter
for tight clearance applications 4.500 1.250 3.250 753-4500 s 743-4500 s 724-4500 l 714-4500 l

4.750 1.250 3.500 753-4750 s 743-4750 s 724-4750 l 714-4750 l

5.000 1.250 3.750 753-5000 s 743-5000 s 724-5000 l 714-5000 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

0.500 0.500 N/A 756-0500 s 746-0500 s 727-0500 l 717-0500 l

7⁄16-20 0.625 0.625 N/A 756-0625 s 746-0625 s 727-0625 l 717-0625 l

0.750 0.750 N/A 756-0750 s 746-0750 s 727-0750 l 717-0750 l

Standard Wrenching 0.875 0.875 N/A 756-0875 s 746-0875 s 727-0875 l 717-0875 l

1.000 1.000 N/A 756-1000 s 746-1000 s 727-1000 l 717-1000 l

1.125 1.125 N/A 756-1125 s 746-1125 s 727-1125 l 717-1125 l

1.250 1.250 N/A 756-1250 s 746-1250 s 727-1250 l 717-1250 l

➍ 7/16˝ thread diameter
20 threads per inch 1.375 1.250 0.125 756-1375 s 746-1375 s 727-1375 l 717-1375 l

1.500 1.250 0.250 756-1500 s 746-1500 s 727-1500 l 717-1500 l

➎ 7/16˝ grip diameter
1.625 1.250 0.375 756-1625 s 746-1625 s 727-1625 l 717-1625 l
➏ 1/2˝ wrenching
1.750 1.250 0.500 756-1750 s 746-1750 s 727-1750 l 717-1750 l
➐ 0.345˝ head height
1.875 1.250 0.625 756-1875 s 746-1875 s 727-1875 l 717-1875 l
➑ 0.740˝ collar diameter 2.000 1.250 0.750 756-2000 s 746-2000 s 727-2000 l 717-2000 l

2.125 1.250 0.875 756-2125 s 746-2125 s 727-2125 l 717-2125 l

2.250 1.250 1.000 756-2250 s 746-2250 s 727-2250 l 717-2250 l

153
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
7/16-20 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

2.375 1.250 1.125 756-2375 s 746-2375 s 727-2375 l 717-2375 l

2.500 1.250 1.250 756-2500 s 746-2500 s 727-2500 l 717-2500 l

2.625 1.250 1.375 756-2625 s 746-2625 s 727-2625 l 717-2625 l

2.750 1.250 1.500 756-2750 s 746-2750 s 727-2750 l 717-2750 l

2.875 1.250 1.625 756-2875 s 746-2875 s 727-2875 l 717-2875 l

3.000 1.250 1.750 756-3000 s 746-3000 s 727-3000 l 717-3000 l

3.125 1.250 1.875 756-3125 s 746-3125 s 727-3125 l 717-3125 l

3.250 1.250 2.000 756-3250 s 746-3250 s 727-3250 l 717-3250 l

(CONTINUED) 3.375 1.250 2.125 756-3375 s 746-3375 s 727-3375 l 717-3375 l

7⁄16-20 3.500 1.250 2.250 756-3500 s 746-3500 s 727-3500 l 717-3500 l

3.625 1.250 2.375 756-3625 s 746-3625 s 727-3625 l 717-3625 l

3.750 1.250 2.500 756-3750 s 746-3750 s 727-3750 l 717-3750 l

Standard Wrenching
3.875 1.250 2.625 756-3875 s 746-3875 s 727-3875 l 717-3875 l

4.000 1.250 2.750 756-4000 s 746-4000 s 727-4000 l 717-4000 l

4.125 1.250 2.875 756-4125 s 746-4125 s 727-4125 l 717-4125 l

➍ 7/16˝ thread diameter
20 threads per inch 4.250 1.250 3.000 756-4250 s 746-4250 s 727-4250 l 717-4250 l

4.375 1.250 3.125 756-4375 s 746-4375 s 727-4375 l 717-4375 l

➎ 7/16˝ grip diameter
4.500 1.250 3.250 756-4500 s 746-4500 s 727-4500 l 717-4500 l
➏ 1/2˝ wrenching
4.625 1.250 3.375 756-4625 s 746-4625 s 727-4625 l 717-4625 l
➐ 0.345˝ head height
4.750 1.250 3.500 756-4750 s 746-4750 s 727-4750 l 717-4750 l
➑ 0.740˝ collar diameter 4.875 1.250 3.625 756-4875 s 746-4875 s 727-4875 l 717-4875 l

5.000 1.250 3.750 756-5000 s 746-5000 s 727-5000 l 717-5000 l

5.125 1.250 3.875 756-5125 s 746-5125 s 727-5125 l 717-5125 l

5.250 1.250 4.000 756-5250 s 746-5250 s 727-5250 l 717-5250 l

5.375 1.250 4.125 756-5375 s 746-5375 s 727-5375 l 717-5375 l

5.500 1.250 4.250 756-5500 s 746-5500 s 727-5500 l 717-5500 l

5.625 1.250 4.375 756-5625 s 746-5625 s 727-5625 l 717-5625 l

5.750 1.250 4.500 756-5750 s 746-5750 s 727-5750 l 717-5750 l

5.875 1.250 4.625 756-5875 s 746-5875 s 727-5875 l 717-5875 l

6.000 1.250 4.750 756-6000 s 746-6000 s 727-6000 l 717-6000 l

154
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 1/2-13
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

1.000 1.000 n/a * 617-1000 s 627-1000 s 646-1000 l 656-1000 l

1.250 1.250 n/a * 617-1250 s 627-1250 s 646-1250 l 656-1250 l

1.500 1.250 0.250 617-1500 s 627-1500 s 646-1500 l 656-1500 l

1.750 1.250 0.500 617-1750 s 627-1750 s 646-1750 l 656-1750 l

2.000 1.250 0.750 617-2000 s 627-2000 s 646-2000 l 656-2000 l

2.250 1.250 1.000 617-2250 s 627-2250 s 646-2250 l 656-2250 l

2.500 1.250 1.250 617-2500 s 627-2500 s 646-2500 l 656-2500 l

1⁄ 2-13 2.750 1.250 1.500 617-2750 s 627-2750 s 646-2750 l 656-2750 l

3.000 1.250 1.750 617-3000 s 627-3000 s 646-3000 l 656-3000 l

➍ 1/2˝ thread diameter
13 threads per inch 3.250 1.250 2.000 617-3250 s 627-3250 s 646-3250 l 656-3250 l

➎ 1/2˝ grip diameter 3.500 1.250 2.250 617-3500 s 627-3500 s 646-3500 l 656-3500 l

3.750 1.250 2.500 617-3750 s 627-3750 s 646-3750 l 656-3750 l

➏ 9/16˝ wrenching
4.000 1.250 2.750 617-4000 s 627-4000 s 646-4000 l 656-4000 l
➐ 0.450˝ head height
4.250 1.250 3.000 617-4250 s 627-4250 s 646-4250 l 656-4250 l
➑ 0.850˝ collar diameter
4.500 1.250 3.250 617-4500 s 627-4500 s 646-4500 l 656-4500 l

4.750 1.250 3.500 617-4750 s 627-4750 s 646-4750 l 656-4750 l

5.000 1.250 3.750 617-5000 s 627-5000 s 646-5000 l 656-5000 l

5.250 1.250 4.000 617-5250 s 627-5250 s 646-5250 l 656-5250 l

5.500 1.250 4.250 617-5500 s 627-5500 s 646-5500 l 656-5500 l

5.750 1.250 4.500 617-5750 s 627-5750 s 646-5750 l 656-5750 l

6.000 1.250 4.750 617-6000 s 627-6000 s 646-6000 l 656-6000 l

155
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
1/2-20 BOLT 5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

1.000 1.000 n/a * 716-1000 s 726-1000 s 745-1000 l 755-1000 l

1.250 1.250 n/a * 716-1250 s 726-1250 s 745-1250 l 755-1250 l

1.500 1.250 0.250 716-1500 s 726-1500 s 745-1500 l 755-1500 l

1.750 1.250 0.500 716-1750 s 726-1750 s 745-1750 l 755-1750 l

2.000 1.250 0.750 716-2000 s 726-2000 s 745-2000 l 755-2000 l

2.250 1.250 1.000 716-2250 s 726-2250 s 745-2250 l 755-2250 l

2.500 1.250 1.250 716-2500 s 726-2500 s 745-2500 l 755-2500 l

1⁄ 2-20 2.750 1.250 1.500 716-2750 s 726-2750 s 745-2750 l 755-2750 l

3.000 1.250 1.750 716-3000 s 726-3000 s 745-3000 l 755-3000 l

➍ 1/2˝ thread diameter
20 threads per inch 3.250 1.250 2.000 716-3250 s 726-3250 s 745-3250 l 755-3250 l

➎ 1/2˝ grip diameter 3.500 1.250 2.250 716-3500 s 726-3500 s 745-3500 l 755-3500 l

3.750 1.250 2.500 716-3750 s 726-3750 s 745-3750 l 755-3750 l

➏ 9/16˝ wrenching
4.000 1.250 2.750 716-4000 s 726-4000 s 745-4000 l 755-4000 l
➐ 0.450˝ head height
4.250 1.250 3.000 716-4250 s 726-4250 s 745-4250 l 755-4250 l
➑ 0.850˝ collar diameter
4.500 1.250 3.250 716-4500 s 726-4500 s 745-4500 l 755-4500 l

4.750 1.250 3.500 716-4750 s 726-4750 s 745-4750 l 755-4750 l

5.000 1.250 3.750 716-5000 s 726-5000 s 745-5000 l 755-5000 l

5.250 1.250 4.000 716-5250 s 726-5250 s 745-5250 l 755-5250 l

5.500 1.250 4.250 716-5500 s 726-5500 s 745-5500 l 755-5500 l

5.750 1.250 4.500 716-5750 s 726-5750 s 745-5750 l 755-5750 l

6.000 1.250 4.750 716-6000 s 726-6000 s 745-6000 l 755-6000 l

156
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 M6 X 1.00
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

12 12 n/a * 660-1016 s 670-1016 s 760-1016 l 770-1016 l

16 16 n/a * 660-1017 s 670-1017 s 760-1017 l 770-1017 l

20 20 n/a * 660-1001 s 670-1001 s 760-1001 l 770-1001 l

25 25 n/a * 660-1002 s 670-1002 s 760-1002 l 770-1002 l

30 18 12 660-1003 s 670-1003 s 760-1003 l 770-1003 l

M6 x 1.00 35 18 17 660-1004 s 670-1004 s 760-1004 l 770-1004 l

40 18 22 660-1005 s 670-1005 s 760-1005 l 770-1005 l

➍ M6 thread diameter
1.00 thread pitch 45 18 27 660-1006 s 670-1006 s 760-1006 l 770-1006 l

50 18 32 660-1007 s 670-1007 s 760-1007 l 770-1007 l

➎ 6mm grip diameter
55 18 37 660-1008 s 670-1008 s 760-1008 l 770-1008 l
➏ 8mm wrenching
60 18 42 660-1009 s 670-1009 s 760-1009 l 770-1009 l
➐ 6.5mm head height 65 18 47 660-1010 s 670-1010 s 760-1010 l 770-1010 l
➑ 11.6mm 70 18 52 660-1011 s 670-1011 s 760-1011 l 770-1011 l
collar diameter
75 18 57 660-1012 s 670-1012 s 760-1012 l 770-1012 l

80 18 62 660-1013 s 670-1013 s 760-1013 l 770-1013 l

90 18 72 660-1014 s 670-1014 s 760-1014 l 770-1014 l

100 18 82 660-1015 s 670-1015 s 760-1015 l 770-1015 l

135 18 117 660-1018 s 670-1018 s 760-1018 l 770-1018 l

157
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK
M8 BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

12 12 n/a * 661-1016 s 671-1016 s 761-1016 l 771-1016 l

16 16 n/a * 661-1017 s 671-1017 s 761-1017 l 771-1017 l

20 20 n/a * 661-1001 s 671-1001 s 761-1001 l 771-1001 l

25 25 n/a * 661-1002 s 671-1002 s 761-1002 l 771-1002 l

30 22 8 661-1003 s 671-1003 s 761-1003 l 771-1003 l

35 22 13 661-1004 s 671-1004 s 761-1004 l 771-1004 l

M8 x 1.25 40 22 18 661-1005 s 671-1005 s 761-1005 l 771-1005 l

➍ M8 thread diameter 45 22 23 661-1006 s 671-1006 s 761-1006 l 771-1006 l

1.25 thread pitch
50 22 28 661-1007 s 671-1007 s 761-1007 l 771-1007 l
➎ 8mm grip diameter 55 22 33 661-1008 s 671-1008 s 761-1008 l 771-1008 l

➏ 10mm wrenching 60 22 38 661-1009 s 671-1009 s 761-1009 l 771-1009 l

➐ 7.4mm head height 65 22 43 661-1010 s 671-1010 s 761-1010 l 771-1010 l

70 22 48 661-1011 s 671-1011 s 761-1011 l 771-1011 l

➑ 15.0mm
collar diameter
75 22 53 661-1012 s 671-1012 s 761-1012 l 771-1012 l

80 22 58 661-1013 s 671-1013 s 761-1013 l 771-1013 l

85 22 63 661-1018 s 671-1018 s 761-1018 l 771-1018 l

90 22 68 661-1014 s 671-1014 s 761-1014 l 771-1014 l

100 22 78 661-1015 s 671-1015 s 761-1015 l 771-1015 l

115 22 93 661-1019 s 671-1019 s 761-1019 l 771-1019 l

158
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 M10
BULK
BOLT
FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

20 20 n/a * 663-1001 s 673-1001 s 763-1001 l 773-1001 l

25 25 n/a * 663-1002 s 673-1002 s 763-1002 l 773-1002 l

M10 x 1.25 30 30 n/a * 663-1003 s 673-1003 s 763-1003 l 773-1003 l

35 35 n/a * 663-1004 s 673-1004 s 763-1004 l 773-1004 l

➍ M10 thread diameter
1.25 thread pitch 40 26 14 663-1005 s 673-1005 s 763-1005 l 773-1005 l

45 26 19 663-1006 s 673-1006 s 763-1006 l 773-1006 l

➎ 10mm grip diameter
50 26 24 663-1007 s 673-1007 s 763-1007 l 773-1007 l
➏ 12mm wrenching
60 26 34 663-1008 s 673-1008 s 763-1008 l 773-1008 l
➐ 9.0mm head height 70 26 44 663-1009 s 673-1009 s 763-1009 l 773-1009 l
➑ 18.5mm 80 26 54 663-1010 s 673-1010 s 763-1010 l 773-1010 l
collar diameter
90 26 64 663-1011 s 673-1011 s 763-1011 l 773-1011 l

100 26 74 663-1012 s 673-1012 s 763-1012 l 773-1012 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

20 20 n/a * 662-1001 s 672-1001 s 762-1001 l 772-1001 l

25 25 n/a * 662-1002 s 672-1002 s 762-1002 l 772-1002 l

30 30 n/a * 662-1003 s 672-1003 s 762-1003 l 772-1003 l

M10 x 1.50 35 35 n/a * 662-1004 s 672-1004 s 762-1004 l 772-1004 l

➍ M10 thread diameter 40 26 14 662-1005 s 672-1005 s 762-1005 l 772-1005 l

1.50 thread pitch
45 26 19 662-1006 s 672-1006 s 762-1006 l 772-1006 l
➎ 10mm grip diameter 50 26 24 662-1007 s 672-1007 s 762-1007 l 772-1007 l

➏ 12mm wrenching 60 26 34 662-1008 s 672-1008 s 762-1008 l 772-1008 l

➐ 9.0mm head height 65 26 39 662-1013 s 672-1013 s 762-1013 l 772-1013 l

70 26 44 662-1009 s 672-1009 s 762-1009 l 772-1009 l

➑ 18.5mm
collar diameter
80 26 54 662-1010 s 672-1010 s 762-1010 l 772-1010 l

90 26 64 662-1011 s 672-1011 s 762-1011 l 772-1011 l

100 26 74 662-1012 s 672-1012 s 762-1012 l 772-1012 l

159
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULKBOLT
M12 FASTENERS
5-PACKS
Black Oxide Stainless
UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

25 25 n/a * 664-1001 s 674-1001 s 764-1001 l 774-1001 l

30 30 n/a * 664-1002 s 674-1002 s 764-1002 l 774-1002 l

M12 x 1.50 35 30 5 664-1003 s 674-1003 s 764-1003 l 774-1003 l

➍ M12 thread diameter 40 30 10 664-1004 s 674-1004 s 764-1004 l 774-1004 l

1.50 thread pitch
45 30 15 664-1005 s 674-1005 s 764-1005 l 774-1005 l
➎ 12mm grip diameter 50 30 20 664-1006 s 674-1006 s 764-1006 l 774-1006 l

➏ 14mm wrenching 60 30 30 664-1007 s 674-1007 s 764-1007 l 774-1007 l

➐ 11.7mm head height 70 30 40 664-1008 s 674-1008 s 764-1008 l 774-1008 l

80 30 50 664-1009 s 674-1009 s 764-1009 l 774-1009 l

➑ 21.6mm
collar diameter
90 30 60 664-1010 s 674-1010 s 764-1010 l 774-1010 l

100 30 70 664-1011 s 674-1011 s 764-1011 l 774-1011 l

Black Oxide Stainless

UHL Thread Length Grip Length
➊ ➋ ➌ Hex 12 point Hex 12 point

25 25 n/a * 665-1001 s 675-1001 s 765-1001 l 775-1001 l

30 30 n/a * 665-1002 s 675-1002 s 765-1002 l 775-1002 l

M12 x 1.75 35 30 5 665-1003 s 675-1003 s 765-1003 l 775-1003 l
➍ M12 thread diameter 40 30 10 665-1004 s 675-1004 s 765-1004 l 775-1004 l
1.75 thread pitch
45 30 15 665-1005 s 675-1005 s 765-1005 l 775-1005 l
➎ 12mm grip diameter 50 30 20 665-1006 s 675-1006 s 765-1006 l 775-1006 l

➏ 14mm wrenching 60 30 30 665-1007 s 675-1007 s 765-1007 l 775-1007 l

➐ 11.7mm head height 70 30 40 665-1008 s 675-1008 s 765-1008 l 775-1008 l

➑ 21.6mm 80 30 50 665-1009 s 675-1009 s 765-1009 l 775-1009 l

collar diameter
90 30 60 665-1010 s 675-1010 s 765-1010 l 775-1010 l
100 30 70 665-1011 s 675-1011 s 765-1011 l 775-1011 l

160
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 SAEBULK
12-POINT
FASTENERS
NUTS

SAE 12-pt Nuts

Available in a variety of sizes to suit your needs, all ARP 12-point nuts
➋
are constructed from 8740 chrome moly steel or ARP Stainless, and
meet ARP’s highest standards of quality. Rated at 180,000 psi tensile
strength, ARP 12-point nuts are manufactured in thick wall versions
➌ ➍
➊ for optimum strength and rigidity and thin wall versions for applica-
tions with limited space requirements. All 8740 chrome moly steel
nuts are black oxide finished and all ARP Stainless nuts are polished
to a briliant luster.
➊ ➋ ➌ ➍ 12-Point 8740 Black Oxide Finish 12-Point ARP Polished Stainless Steel
Collar Socket
Diameter Thread Size Head Height Diameter Size 1 PC Bulk 2 PC-Pack 10 PC-Pack 1 PC Bulk 2 PC-Pack 10 PC-Pack

threads / inch inch inch inch

20 0.300 0.433 5/16 301-8300 s 301-8320 s 301-8340 s 401-8300 l 401-8320 l 401-8340 l
1/4
28 0.300 0.433 5/16 300-8300 s 300-8320 s 300-8330 s 400-8300 l 400-8320 l 400-8330 l

18 0.348 0.526 3/8 301-8303 s 301-8323 s 301-8343 s 401-8303 l 401-8323 l 401-8343 l

5/16
24 0.348 0.526 3/8 300-8301 s 300-8321 s 300-8331 s 400-8301 l 400-8321 l 400-8331 l

11/32 24 0.388 0.644 7/16 300-8373 s 300-8383 s 300-8393 s

16 0.390 0.625 7/16 301-8301 s 301-8321 s 301-8341 s 401-8301 l 401-8321 l 401-8341 l

24 0.390 0.625 7/16 300-8302 s 300-8322 s 300-8332 s 400-8302 l 400-8322 l 400-8332 l

3/8
24 0.420 0.700 1/2 300-8371 s 300-8381 s 300-8391 s

24 0.390 0.645 1/2 300-8372 s 300-8382 s 300-8392 s

14 0.433 0.700 1/2 301-8306 s 301-8326 s 301-8346 s 401-8306 l 401-8326 l 401-8346 l

20 0.432 0.700 1/2 300-8303 s 300-8323 s 300-8333 s 400-8303 l 400-8323 l 400-8333 l

20 0.362 0.600 1/2 300-8375 s 300-8385 s 300-8395 s

7/16
20 0.475 0.800 1/2 301-8316 s 301-8336 s 301-8356 s

20 0.504 0.823 9/16 300-8374 s 300-8384 s 300-8394 s

20 0.504 0.823 5/8 301-8314 s 301-8334 s 301-8354 s

13 0.510 0.823 9/16 301-8302 s 301-8322 s 301-8342 s 401-8302 l 401-8322 l 401-8342 l

20 0.510 0.823 9/16 300-8304 s 300-8324 s 300-8334 s 400-8304 l 400-8324 l 400-8334 l

1/2
20 0.530 0.873 5/8 300-8306 s 300-8326 s 300-8336 s

20 0.640 0.875 11/16 301-8313 s 301-8333 s 301-8353 s

12 0.620 0.965 11/16 301-8307 s 301-8327 s 301-8347 s

9/16
18 0.620 0.965 11/16 300-8305 s 300-8325 s 300-8335 s 400-8305 l 400-8325 l 400-8335 l

5/8 18 0.700 1.225 13/16 300-8309 s 300-8329 s 300-8339 s

161
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
METRIC 12-POINT NUTS
➋

➊ ➌ ➍

Metric 12-point Nuts

➊ ➋ ➌ ➍ 12-Point 8740 Black Oxide Finish 12-Point ARP Polished Stainless Steel
Collar Socket
Diameter Thread Size Head Height Diameter Size 1 PC Bulk 2 PC-Pack 10 PC-Pack 1 PC Bulk 2 PC-Pack 10 PC-Pack

thread pitch mm (in.) mm (in.) mm

M6 1.00 6.1 (0.241) 10.5 (0.413) 8 300-8370 s 300-8380 s 300-8390 s 400-8370 l 400-8380 l 400-8390 l

M7 1.00 7.0 (0.275) 12.0 (0.472) 9 300-8346 s 300-8356 s 300-8366 s 400-8346 l 400-8356 l 400-8366 l

1.00 8.1 (0.320) 15.9 (0.625) 10 300-8340 s 300-8350 s 300-8360 s 400-8340 l 400-8350 l 400-8360 l
M8
1.25 8.1 (0.320) 13.6 (0.535) 10 300-8310 s 300-8311 s 300-8312 s 400-8310 l 400-8311 l 400-8312 l

1.00 9.5 (0.375) 15.6 (0.615) 11 300-8341 s 300-8351 s 300-8361 s 400-8341 l 400-8351 l 400-8361 l

M9 1.00 8.4 (0.330) 18.2 (0.720) 13 301-8308 s 301-8328 s 301-8348 s

1.25 8.0 (0.316) 15.6 (0.615) 11 300-8342 s 300-8352 s 300-8362 s

1.00 10.2 (0.400) 17.8 (0.700) 12 301-8311 s 301-8331 s 301-8351 s 401-8311 l 401-8331 l 401-8351 l

1.00 10.2 (0.400) 14.0 (0.550) 12 301-8319 s 301-8339 s 301-8359 s

1.25 10.2 (0.400) 15.9 (0.625) 12 300-8343 s 300-8353 s 300-8363 s 400-8343 l 400-8353 l 400-8363 l

1.25 10.2 (0.400) 17.8 (0.700) 12 300-8344 s 300-8354 s 300-8364 s 400-8344 l 400-8354 l 400-8364 l
M10
1.25 8.1 (0.320) 15.0 (0.590) 12 301-8310 s 301-8330 s 301-8350 s

1.25 11.4 (0.450) 20.7 (0.815) 16 301-8312 s 301-8332 s 301-8352 s

1.25 9.5 (0.375) 20.6 (0.810) 16 301-8315 s 301-8335 s 301-8355 s

1.50 10.2 (0.400) 17.8 (0.700) 12 300-8345 s 300-8355 s 300-8365 s 400-8345 l 400-8355 l 400-8365 l

1.25 11.0 (0.432) 17.8 (0.700) 13 301-8361 s 301-8381 s 301-8401 s 401-8361 l 401-8381 l 401-8401 l
M11
1.25 13.0 (0.501) 20.9 (0.823) 14 301-8362 s 301-8382 s 301-8402 s 401-8362 l 401-8382 l 401-8402 l

1.00 12.8 (0.504) 19.1 (0.750) 14 300-8347 s 300-8367 s 300-8387 s 400-8347 l 400-8367 l 400-8387 l

1.25 12.8 (0.504) 20.9 (0.823) 14 300-8307 s 300-8327 s 300-8337 s 400-8307 l 400-8327 l 400-8337 l

1.25 12.8 (0.540) 19.1 (0.750) 14 300-8308 s 300-8328 s 300-8338 s 400-8308 l 400-8328 l 400-8338 l

1.25 13.5 (0.530) 22.2 (0.873) 16 301-8318 s 301-8338 s 301-8358 s

M12
1.25 10.8 (0.425) 23.5 (0.925) 16 301-8309 s 301-8329 s 301-8349 s

1.25 9.5 (0.375) 20.7 (0.815) 16 301-8360 s 301-8380 s 301-8400 s

1.50 12.8 (0.504) 21.6 (0.850) 14 401-8363 l 401-8383 l 401-8403 l

1.75 12.8 (0.504) 20.9 (0.823) 14 300-8376 s 300-8386 s 300-8396 s 400-8376 l 400-8386 l 400-8396 l

162
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
HEX NUTS
SAE & Metric Hex Nuts
Constructed from the finest quality materials, these hex nuts are available in most sizes to meet your
needs. All hex nuts meet ARP’s exacting quality control standards and are black oxided. All hex nuts
are rated 180,000 psi tensile strength.
Thread Socket Hex Hex Hex Hex SS
Size Size (1 PC-Bulk) (2 PC-Pack) (10 PC-Pack) (1 PC-Bulk)

1/4-28 (2) 7/16 200-8601 s 200-8621 s 200-8631 s

5/16-18 (2) 1/2 301-8304 s 301-8324 s 301-8344 s 401-8304 l

5/16-24 3/8 200-8614 s 200-8644 s 200-8674 s 400-8614 l

5/16-24 1/2 200-8602 s 200-8622 s 200-8632 s

11/32-24 1/2 200-8603 s 200-8623 s 200-8633 s

3/8-16 (2) 9/16 200-8704 s 200-8724 s 200-8734 s 400-8704 l

3/8-24 9/16 200-8604 s 200-8624 s 200-8634 s 400-8604 l

7/16-14 (2) 5/8 301-8305 s 301-8325 s 301-8345 s 401-8305 l

7/16-20 5/8 200-8605 s 200-8625 s 200-8635 s 400-8605 l

7/16-20 11/16 200-8606 s 200-8626 s 200-8636 s

1/2-20 3/4 200-8607 s 200-8627 s 200-8637 s 400-8607 l

M10 x 1.25 15mm 300-8348 s 300-8358 s 300-8368 s

M12 x 1.25 18mm 300-8349 s 300-8359 s 300-8369 s

SAE & Nyloc 5-packs

To compliment ARP “bulk” 5-pack chrome moly and stainless steel fasteners we have assembled
matching groups of nuts. Take your pick from stainless steel and black oxide finished standard nuts or
stainless steel Nyloc and cad plated Nyloc self-locking nuts.
Stainless Black Oxide Cad Plated
Thread Size Stainless Nyloc Hex
Hex Hex Nyloc Hex

STANDARD THREAD

1/4-20 400-8651 l 200-8651 s 400-8661 l 200-8661 s

5/16-18 400-8652 l 200-8652 s 400-8662 l 200-8662 s

3/8-16 400-8654 l 200-8654 s 400-8664 l 200-8664 s

7/16-14 400-8656 l 200-8656 s 400-8666 l 200-8666 s

1/2-13 400-8657 l 200-8657 s 400-8667 l 200-8667 s

FINE THREAD

1/4-28 400-8751 l 400-8761 l 400-8771 s

5/16-24 400-8752 l 400-8762 l

3/8-24 400-8754 l 400-8764 l

7/16-20 400-8756 l 400-8766 l

1/2-20 400-8757 l 400-8767 l

163
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
LOCKING NUTS
Serrated Flange Nuts
Thread Socket Hex Hex Hex Hex SS
Note: Do not use on cylinder Size Size (1 PC bulk) (2 PC-Pack) (10 PC-Pack) (1 PC bulk)
heads, mains, or rods!
1/4-28 7/16 200-8609 l 200-8629 l 200-8639 l 400-8609 l

5/16-24 1/2 200-8610 l 200-8620 l 200-8630 l 400-8610 l

These serrated hex nuts with flanged col- 5/16-24 (4) 1/2 200-8645 l 200-8655 l 200-8665 l
lars are available especially for carburetor,
3/8-24 9/16 200-8600 l 200-8640 l 200-8650 l
valve cover, front cover, oil pan studs and
windage tray studs. Made from premi- M10 x 1.25 14mm 200-8663 l 200-8673 l 200-8683 l
um-quality material, they are cad-plated.
(4) non-serrated
All general purpose nuts are rated 150,000
psi tensile strength.

Self-locking Nuts
For high stress, high temperature and severe vibration – all metal hex Jet-nuts and 12-point K-nuts
are ideal for use practically everywhere. Features include elliptically offset, light weight, temperature
resistant, positive locking and almost indefinitely reusable. The upper portion of the nut is distorted
or offset elliptically. The elastic deformation creates a friction hold sufficient to lock the nut. Made of
carbon-alloy steel, cadmium and chromate finish.

Size NAS Part No. Stainless with

Size Steel grey chromate
HEX (JET NUT) finish

10-32 -3 200-8101 s 12-POINT

1/4-28 -4 200-8102 s 10-32 200-8201 s

5/16-24 -5 200-8103 s 1/4-28 200-8202 l 400-8202 s

3/8-24 -6 200-8104 s 5/16-24 200-8203 l 400-8203 s

3/8-24 200-8204 l 400-8204 s

7/16-20 200-8209 s 400-8209 s

1/2-20 200-8210 s 400-8210 s

M6 X 1.00 200-8205 s 400-8205 s

M8 X 1.25 200-8206 s 400-8206 s

M10 X 1.25 200-8207 s

M12 X 1.25 200-8208 s 400-8208 s

M12 X 1.50 400-8211 s

164
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
WASHERS
SAE Washers
A true high performance washer from ARP, available in a variety of sizes and thicknesses, and with or
without I.D. (inside diameter) chamfers. Our washers are constructed from either premium chrome
moly with a black oxide finish or polished ARP stainless steel and are hardened.

➍
➋ ➊
➌

➋
➊ Outside ➌ ➍
Inside Diameter Diameter (in.) Thickness (in.) Chamfer Other Details 1 PC-Bulk 2 PC-Pack 10 PC-Pack

0.500 0.063 Cad Plated 200-8416 s

Yes Black Oxide 200-8648 s 200-8658 s 200-8668 s

1/4 Black Oxide 200-8649 s 200-8659 s 200-8669 s

0.550 0.075
Yes Stainless 400-8505 l 400-8515 l 400-8525 l

Stainless 400-8506 l 400-8516 l 400-8526 l

Black Oxide 200-8593 s 200-8578 s 200-8584 s

0.550 0.095
Yes Black Oxide 200-8594 s 200-8579 s 200-8585 s

0.563 0.063 Cad Plated 200-8417 s

0.120 Yes Stainless 400-8530 l 400-8540 l 400-8550 l

Yes Black Oxide 200-8431 s 200-8441 s 200-8451 s

Black Oxide 200-8432 s 200-8442 s 200-8452 s

5/16 0.655 0.075
Yes Stainless 400-8431 l 400-8441 l 400-8451 l

Stainless 400-8432 l 400-8442 l 400-8452 l

Black Oxide 200-8595 s 200-8580 s 200-8586 s

0.675 0.120
Yes Black Oxide 200-8575 s 200-8581 s 200-8587 s

Black Oxide 200-8576 s 200-8582 s 200-8588 s

0.812 0.120
Yes Black Oxide 200-8577 s 200-8583 s 200-8589 s

165
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
WASHERS
SAE Washers
➋
➊ Outside ➌ ➍
Inside Diameter Diameter (in.) Thickness (in.) Chamfer Other Details 1 PC-Bulk 2 PC-Pack 10 PC-Pack

Yes Black Oxide 200-8505 s 200-8675 s 200-8685 s

0.063 Stainless 200-8405 l

0.625 Cad Plated 200-8418 s

Black Oxide 200-8504 s 200-8544 s 200-8554 s

0.120
Yes Black Oxide 200-8611 s 200-8612 s 200-8613 s

Yes Black Oxide 200-8764 s 200-8774 s 200-8784 s

Black Oxide 200-8765 s 200-8775 s 200-8785 s

0.655 0.090
Yes Stainless 400-8423 l 400-8433 l 400-8443 l

Stainless 400-8765 l 400-8775 l 400-8785 l

0.675 0.120 Black Oxide 200-8506 s 200-8546 s 200-8556 s

3/8 0.688 0.075 Black Oxide 200-8412 s

0.715 0.120 Stainless 400-8501 l 400-8504 l 400-8508 l

Yes Black Oxide 200-8453 s 200-8463 s 200-8473 s

Black Oxide 200-8454 s 200-8464 s 200-8474 s

0.725 0.090
Yes Stainless 400-8453 l 400-8463 l 400-8473 l

Stainless 400-8454 l 400-8464 l 400-8474 l

Black Oxide 200-8507 s 200-8677 s 200-8687 s

0.750 0.120 Yes Stainless 400-8507 l 400-8527 l 400-8537 l

Yes Black Oxide 200-8517 s 200-8547 s 200-8557 s

Black Oxide,
0.875 0.150 200-8508 s 200-8678 s 200-8688 s
O.D. Chamfer

1.200 0.120 Yes Black Oxide 200-8713 s 200-8733 s 200-8763 s

0.660 0.120 Yes Black Oxide 200-8718 s 200-8738 s 200-8768 s

Black Oxide,
0.675 0.062 Yes 200-8501 s 200-8671 s 200-8681 s
rod bolt washer

Yes Black Oxide 200-8770 s 200-8780 s 200-8790 s

7/16
Black Oxide 200-8771 s 200-8781 s 200-8791 s
0.705 0.090
Yes Stainless 400-8770 l 400-8780 l 400-8790 l

Stainless 400-8772 l 400-8782 l 400-8792 l

166
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
WASHERS
SAE Washers
➋
➊ Outside ➌ ➍
Inside Diameter Diameter (in.) Thickness (in.) Chamfer Other Details 1 PC-Bulk 2 PC-Pack 10 PC-Pack

0.063 Cad Plated 200-8419 s

Black Oxide,
0.073 Yes 200-8502 s 200-8672 s 200-8682 s
rod bolt washer
0.750
Black Oxide 200-8511 s 200-8521 s 200-8531 s
0.120
Yes Black Oxide 200-8518 s 200-8548 s 200-8558 s

Yes Black Oxide 200-8776 s 200-8786 s 200-8796 s

0.765 0.090 Black Oxide 200-8778 s 200-8788 s 200-8798 s

Yes Stainless 400-8776 l 400-8786 l 400-8796 l

0.875 0.090 Stainless 400-8707 l 400-8727 l 400-8747 l

7/16
Yes Black Oxide 200-8509 s 200-8529 s 200-8539 s

0.812 0.120 Yes Stainless 400-8509 l 400-8529 l 400-8539 l

Black Oxide 200-8510 s 200-8520 s 200-8530 s

Black Oxide 200-8707 s 200-8727 s 200-8747 s

0.875 0.120
Yes Black Oxide 200-8512 s 200-8522 s 200-8532 s

0.995 0.120 Black Oxide 200-8708 s 200-8728 s 200-8748 s

1.300 0.120 Black Oxide 200-8429 s 200-8439 s 200-8449 s

2.000 0.275 Yes Black Oxide 200-8717 l

0.063 Cad Plated 200-8407 s

0.875 Yes Black Oxide 200-8513 s 200-8523 s 200-8533 s

0.120
Black Oxide 200-8514 s 200-8524 s 200-8534 s
1/2
1.300 0.120 Black Oxide 200-8702 s 200-8722 s 200-8742 s

1.350 0.245 Yes Black Oxide 200-8703 s

2.000 0.275 Yes Black Oxide 200-8749 l

Black Oxide 200-8515 s 200-8525 s 200-8535 s

9/16 1.000 0.120
Yes Black Oxide 200-8719 s 200-8739 s 200-8769 s

1.300 0.120 Black Oxide 200-8753 s

5/8 1.600 0.275 Black Oxide 200-8754 l

2.000 0.275 Yes Black Oxide 200-8755 l

1.750 0.275 Yes Black Oxide 200-8714 l

3/4
2.000 0.275 Yes Black Oxide 200-8715 l

167
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENERS
WASHERS
Metric Washers
➋ ➌
➊ Outside Dia. Thickness ➍
Inside Diameter mm (in.) mm (in.) Chamfer Other Details 1 PC-Bulk 2 PC-Pack 10 PC-Pack

Black Oxide 200-8711 s 200-8741 s 200-8761 s

22.6 (0.890) 4.2 (0.165)
M6 Stainless 400-8711 l

25.1 (0.990) 1.7 (0.065) Black Oxide 200-8676 s 200-8686 s 200-8696 s

M8 14.5 (0.575) 1.6 (0.060) Black Oxide 200-8641 s 200-8642 s 200-8643 s

17.0 (0.670) 3.0 (0.120) Black Oxide 200-8757 s 200-8777 s 200-8797 s

M9 Black Oxide 200-8712 s 200-8732 s 200-8762 s

20.6 (0.812) 3.0 (0.120)
Yes Black Oxide 200-8729 s 200-8759 s 200-8789 s

15.0 (0.591) 2.0 (0.078) Yes Black Oxide 200-8716 s 200-8736 s 200-8766 s

16.0 (0.630) 1.9 (0.075) Yes Stainless 400-8503 l 400-8523 l 400-8533 l

Yes Black Oxide 200-8705 s 200-8725 s 200-8745 s

Black Oxide 200-8519 s 200-8679 s 200-8689 s

19.1 (0.750) 3.0 (0.120)
Yes Stainless 400-8519 l 400-8520 l 400-8521 l

M10 Stainless 400-8524 l 400-8534 l 400-8544 l

Yes Black Oxide 200-8455 s 200-8465 s 200-8475 s

19.2 (0.755) 2.3 (0.090)
Yes Stainless 400-8455 l 400-8465 l 400-8475 l

21.6 (0.850) 3.0 (0.115) Black Oxide 200-8590 s 200-8591 s 200-8592 s

4.1 (0.160) Yes Stainless 400-8502 l 400-8522 l 400-8532 l

22.0 (0.865)
3.2 (0.155) Yes Black Oxide 200-8706 l 200-8726 l 200-8746 l

Black Oxide 200-8516 s 200-8526 s 200-8536 s

19.1 (0.750) 3.0 (0.120)
Yes Black Oxide 200-8710 s 200-8740 s 200-8760 s

20.6 (0.812) 3.0 (0.120) Black Oxide 200-8427 s 200-8437 s 200-8447 s

2.3 (0.090) Yes Black Oxide 200-8428 s 200-8438 s 200-8448 s

3.0 (0.120) Yes Black Oxide 200-8549 s 200-8550 s 200-8551 s

M12 22.2 (0.875)
2.3 (0.090) Yes Stainless 400-8428 l

3.0 (0.120) Black Oxide 200-8500 s 200-8527 s 200-8537 s

25.3 (0.995) 3.0 (0.120) Black Oxide 200-8752 s 200-8772 s 200-8792 s

37.6 (1.480) 5.1 (0.200) Yes Black Oxide 200-8750 l

39.4 (1.550) 7.0 (0.275) Yes Black Oxide 200-8751 l

M14 39.4 (1.560) 7.0 (0.275) Yes Black Oxide 200-8756 l

M18 73.7 (2.900) 9.9 (0.390) Yes Black Oxide 200-8793 s

168
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 INSERT WASHERS
BULK
& WELD
FASTENERS
BUNGS
Insert Washers
These handy washers are made to protect the top of holes from galling or collapsing around studs or
bolts. They’re ideal for head bolt holes, mid-motor plates, or any other high-wear area that requires
a washer. Easy to install by just oversizing hole and pressing in washer. ARP Insert Washers are fully
CNC machined from premium thru-hardened 8740 stock.

Note: Insert washers for Ford applications also listed in head bolts on page 76.

Insert ID Insert OD OD Size 1 PC-Bulk 2 PC-Pack 10 PC-Pack

1/4 0.318 0.562 200-8560 l 200-8565 l 200-8570 l

5/16 0.380 0.625 200-8561 l 200-8566 l 200-8571 l

3/8 0.443 0.750 200-8562 l 200-8567 l 200-8572 l

7/16 0.571 0.812 200-8563 l 200-8568 l 200-8573 l

7/16 0.529 0.875 200-8596 l 200-8597 l 200-8598 l

1/2 0.567 0.875 200-8564 l 200-8569 l 200-8574 l

M10* 0.500 0.790 400-8551 l

* Stainless steel

Weld Bungs
ARP has introduced a line of premium quality weld-in bungs. The parts are CNC machined from solid
aluminum billet (6061) or 1018 mild steel. Applications include, but are not limited to: oil or fuel
tanks, radiators, valve covers, manifolds, and rear axle housings. Fittings are available with female
pipe threads, male AN, and female O-ring types. The fittings come in sizes: 1/4, 3/8, 1/2, 3/4, and 1
inch sizes; NPT -6 thru -20 AN; and -6 thru -20 O-ring sizes.

NPT AN Male AN O-Ring

Aluminum Steel Aluminum Steel Aluminum Steel

Size Part No. Size Part No. Size Part No. Size Part No. Size Part No. Size Part No.

1/4 800-8101 s 1/4 800-8201 s AN6 800-8106 s AN6 800-8206 s -6 800-8112 s -6 800-8212 s

3/8 800-8102 s 3/8 800-8202 s AN8 800-8107 s AN8 800-8207 s -8 800-8113 s -8 800-8213 s

1/2 800-8103 s 1/2 800-8203 s AN10 800-8108 s AN10 800-8208 s -10 800-8114 s -10 800-8214 s

3/4 800-8104 s 3/4 800-8204 s AN12 800-8109 s AN12 800-8209 s -12 800-8115 s -12 800-8215 s

1 800-8105 s 1 800-8205 s AN16 800-8110 s AN16 800-8210 s -16 800-8116 s -16 800-8216 s

AN20 800-8111 s AN20 800-8211 s -20 800-8117 s -20 800-8217 s

169
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 BULK FASTENER BINS
Bulk Fastener Bins – Stock or Custom
STANDARD Bulk Bins METRIC Bulk Bins
998-0500 - ARP Stainless 12 pt l 998-0504 - ARP Stainless 12 pt l

998-0501 - Black Oxide 8740 12 pt s 998-0505 - Black Oxide 8740 12 pt s

998-0502 - ARP Stainless Hex l 998-0506 - ARP Stainless Hex l

998-0503 - Black Oxide 8740 Hex s 998-0507 - Black Oxide 8740 Hex s
Drawer Dia.-Pitch Lengths Bolts Nuts Washers Drawer Dia.-Pitch Lengths Bolts Nuts Washers
A 1/4-20 0.515-3.000 240 100 100 A M6 x 1.00 20-70mm 240 100 100
B 5/16-18 0.560-3.000 160 100 100 B M8 x 1.25 20-70mm 185 100 100
C 3/8-16 0.500-3.000 185 100 150 C M10 x 1.25 20-70mm 85 100 150
D 7/16-14 1.000-3.000 85 100 100 D M10 x 1.50 20-70mm 90 100 100

SAMPLE DRAWER LABELS

¼-20 Stainless 12 pt ¼-20 Stainless 12 pt

.515 .750 1.000 1.250 1.500 ARP

Ultra-Torque®
ARP Part # 2AL.515-3SL ARP Part # 2AL.750-3SL ARP Part # 2AL1.000-3SL ARP Part # 2AL1.250-12SL / -14 Black Oxide
ARP Part #72AL1.500-12SL
16 Hex
Fastener
7/16-14 Black Oxide Hex
Assembly
1.000 Lubricant
1.250 1.500 1.750 2.000 ARP
1.750 2.000 2.250 2.500 2.750 ARP Part # H4AP1.000-5C ARP Part # H4AP1.250-5C ARP Part # H4AP1.500-5C ARP Part # H4AP1.750-5C ARP Part # H4AP2.000-5C
Ultra-Torque®
Fastener
ARP Part # 2AL1.750-12SL ARP Part # 2AL2.000-12SL ARP Part # 2AL2.250-12SL ARP Part # 2AL2.500-12SL ARP Part # 2AL2.750-12SL ARP Part # 100-9909
Assembly
Lubricant
2.250 2.500 2.750 3.000
3.000
ARP Part # H4AP2.250-5C ARP Part # H4AP2.500-5C ARP Part # H4AP2.750-5C ARP Part # H4AP3.000-5C ARP Part # 100-9909

Thread
ARP Part # 2AL3.000-12SL
Cleaning
Thread
Tap Cleaning
.500 OD .562 OD Hex Nuts Nyloc
Hex Nuts
Tap
Washer Washer
ARP Part # 400-8651 ARP Part # 400-8661
.750 OD .812 OD ARP Part # 911-0001
Hex Nuts
Nyloc
Hex Nuts
ARP Part # 200-8414 ARP Part # 200-8409
Washer Washer
ARP Part # 200-8406 ARP Part # 200-8509 ARP Part # 200-8656 ARP Part # 200-8666 ARP Part # 911-0004

Toll Free: 800-826-3045 • Local: 805-339-2200 • Fax: 805-650-0742

Toll Free: 800-826-3045 • Local: 805-339-2200 • Fax: 805-650-0742
www.arp-bolts.com 07/07 998-0500 [A]
www.arp-bolts.com 07/07 998-0503 [D]

OR CREATE YOUR OWN CUSTOM BIN

If the configuration of our stock bins doesn’t suit your needs, you have the complete
freedom to build your own, customized to the way you work.
Choose any ARP bulk fasteners – bolts, studs, nuts and washers – an endless com-
bination for your shop.
You can even order a custom-printed wrap with your logo or car image.

Call the ARP order desk at 800-826-3045 to place your order.

Professional builders everywhere know what it means to have the right fastener always on hand. Whether you’re a race team, hot rod shop, engine
builder or just a weekend hobbyist that wants to do it right. ARP Bulk Bins offer you the convenience of having the right fasteners at the right time and
can be customized for any work you do.
Bryan Fuller
Fuller Hot Rods

Steve Watt
Speed Demon &
Maxwell Industries

Troy Trepanier
Rad Rides by Troy

170
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 ASSEMBLY LUBRICANT
TOOLS

Fastener
Assembly Lubricant
ARP Ultra-Torque® fastener assembly lubricant has been specifically designed to reduce tension pre-
load scatter and eliminate the need to cycle high performance engine fasteners before final installa-
tion. ARP Ultra-Torque® is a premier blend of extreme pressure lubricants combined with incredible
anti-seize characteristics that perform amazingly well with all high performance engine fasteners.

Benefits of ARP Ultra-Torque®

• OBTAINS: 95%-100% of all ARP recommended • STABILIZES: all ARP fastener installation pre-
installation pre-loads on the first pull, without loads within 5% between a group of fasteners
cycling fasteners before final installation. such as the deck surface of a cylinder block, the
main web of a cylinder block or across the cap of
• MAINTAINS: all ARP recommended installation a connecting rod.
pre-loads within 5% on all remaining cycles, en-
suring consistent and repeatable housing bores No matter what torque cycle you’re on…ARP
and/or cylinder bore dimensions (when using a Ultra-Torque® delivers more consistent, more
honing plate) during machining, mock-up and repeatable fastener tension pre-loads than any
assembly procedures. other lubricant on the market today!

• .Prevents seizing and galling on all threaded • .Prevents rust and corrosion during the life of
fasteners. the lubricant.

• 360˚F melting point. • Metal Free

Lubricant Comparison Data

Installation Preload Scatter Comparison Fastener to Fastener Preload Comparison
(Target Preload 18,000 LBS @ 120 FT-LBS) (Target Preload 18,000 LBS @ 120 FT-LBS)
19,000 19,000 Product Part #
ARP Ultra-Torque
18,000 18,000

17,000
ARP Ultra-Torque
ARP Ultra-Torque - (0.5 oz. pouch) 100-9908
17,000
Preload in lbs

Preload in lbs

16,000 Moly
16,000
EPL
15,000
Oil ARP Ultra-Torque - (1.0 oz. pouch) 100-9913
15,000 EPL
Moly
ARP Ultra-Torque - (1.69 oz. squeeze tube) 100-9909
14,000

14,000
13,000
Oil
13,000
1 2 3 4 5 6 7 8 9 10
12,000
1 2 3 4 5 6 7 8 9 10 ARP Ultra-Torque - (10 oz. brush top container) 100-9910
Torque Cycle Torque Cycle

13,655 13,854 14,111 14,603 15,304 16,203 17,035 18,237 18,452 18,806

15,262 15,559 16,338 16,788 16,859 17,093 17,565 18,121 18,603 18,838
15,027 13,305 13,793 13,687 12,810 12,945 13,813 13,591 12,110 13,462

15,593 16,451 15,477 15,336 15,554 15,506 16,290 14,908 15,014 16,576
ARP Ultra-Torque - (20 oz. brush top container) 100-9911
15,688 15,906 16,533 16,450 17,340 17,906 18,430 18,517 18,902 18,893 14,876 14,031 15,207 15,766 15,197 13,173 14,619 13,462 14,944 13,247

17,928 17,819 17,736 17,883 18,202 18,099 18,356 18,494 17,906 18,163 18,321 18,549 18,025 18,282 18,353 18,028 18,176 18,182 17,929 18,443

171
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TOOLS

Rod Bolt Stretch Gauges

We highly recommend using a stretch gauge when installing rod bolts and other fasteners where it is
possible to measure the length of the bolt after tightening. It is the most accurate way to determine
the correct pre-load in the rod bolt. Simply follow manufacturer’s instructions, or use the chart on
page 30 of this catalog for ARP fasteners. Measure the fastener prior to starting, and monitor overall
length during installation. When the bolt has stretched the specified amount, the correct preload, or
torque, has been applied. We recommend you maintain a chart of all rod bolts, and copy down the
length of the fastener prior to and after installation. If there is a permanent increase of .001˝ in length
or more, or if there is deformation, the bolt should be replaced immediately. Don’t chance it! A sam-
ple chart is as follows:

ARP offers a highly accurate stretch gauge with a dial indicator that reads in increments of .0005˝. Fea-
tures extra heavy springs for consistent repetition. Comes with a heavy-duty, insulated plastic carrying
case for protection. A must for any serious engine builder.

Product Part #

Stretch Gauge 100-9941 s

Stretch Gauge, billet-style 100-9942 s

Stretch Gauge, digital 100-9943 s

Thread Sealer
ARP Thread Sealer is a premium grade thread sealer that is designed for use on all wet deck cylinder
block applications in order to prevent coolant leakage past the head bolt threads, while duplicating
the recommended installation pre-loads associated with all ARP cylinder head bolts and studs. ARP
thread sealer can also be used on pipe plugs, pipe fittings, fuel line fittings or any fitting that requires
a flexible leak proof seal. ARP thread sealer is designed for use on aluminum, steel, stainless steel and
plastic materials against coolants, water, gasoline, oil, natural gas and LPG.

Product Part # • .PTFE based formula w/rust & corrosion inhibitors

Thread Sealer (1.69 fl. oz.) 100-9904 s • Effective range: -30˚ to 550˚F

• Application: aluminum, steel, stainless steel and plastic

against coolants, water, gasoline, natural gas and LPG

• Sealant range: 10,000 psi (pressure)

172
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TOOLS

Rod Bolt Extensions

A long taper and full radius prevents nicking and scratching of crankshaft journals during connecting
rod installation. ARP rod bolt extensions act as a guide during piston and rod installation – they will
also hold the bearing shell in position in some applications. Available in 5/16˝, 3/8˝ and 7/16˝ exten-
sions are packaged in pairs and are hard anodize color coded for ease of identification.

Size Part No.

5/16 910-0001 s

3/8 910-0003 s

7/16 910-0004 s

Set of 3 910-0005 s

ARP Rod Vise

Professional engine builders know that the best way to correctly install connecting rods is to resize
the rods prior to installing them on the crankshaft. This involves installing the rod bolts using ARP
Ultra-Torque and the correct stretch or torque value for your application. Once the rod bolts are prop-
erly installed, the rod journal is measured and machined to the proper size and tolerance providing
correct bearing and oil clearance.

ARP’s anodized aluminum rod vise securely holds the connecting rod while the bolts are being in-
stalled - without damaging the rod.
Size Part No.

Rod Vise 100-9944 s

173
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TOOLS

Thread Cleaning Chasers

ARP’s handy thread cleaning chaser taps are designed with correct thread pitch and diameter to clean
dirty blind or thru holes. Taps come in five USS sizes: 1/4˝, 5/16˝, 3/8˝, 7/16˝ and 1/2˝, as well as metric.
They are sold individually or in sets. Please note that these are strictly cleaning taps and are not de-
signed to cut thread. They are a handy addition to the tool box of any serious engine builder and an
essential aid to preparing any block for final assembly. Don’t take a chance on weakening block and
cylinder head threads. Use these handy thread cleaning chasers whenever possible!

Size Part No. Size Part No. Size Part No.

1/4-20 911-0001 s M10 x 1.50 912-0003 s M12 x 1.50 912-0007 s

5/16-18 911-0002 s M10 x 1.50 x 6.00 in. 912-0019 s M12 x 1.50 x 6.00 in. 912-0015 s
3/8-16 911-0003 s M10 x 2.00 912-0014 s M12 x 1.75 912-0008 s
7/16-14 911-0004 s M11 x 1.25 912-0004 s M12 x 1.75 x 6.00 in. 912-0016 s
1/2-13 911-0005 s M11 x 1.50 912-0005 s M14 x 1.50 912-0017 s
M6 x 1.00 912-0012 s M11 x 1.50 x 152mm 912-0013 s M14 x 2.00 912-0018 s
M8 x 1.25 912-0001 s M11 x 2.00 912-0011 s

M10 x 1.25 912-0002 s M12 x 1.25 912-0006 s

Combination Sets Part No.

USS Combo Pack (5-pc) - 1/4, 5/16, 3/8, 7/16, 1/2 911-0006 s
Metric 1.25 Pitch Combo Pack (4-pc) - M8, M10, M11, M12 912-0009 s
Metric Combo Pack (4-pc, std. length) - M10, M11, M12 (1.50, & 1.75) 912-0010 s

Spark Plug Indexer

By allowing you to consistently position spark plug ground electrodes out of harm’s way, the ARP
indexing tool takes the guess-work out of installing spark plugs where the combustion chamber and
high dome piston clearances is critical. Designed to fit in the palm of your hand, this tool eliminates
the need to perform cylinder head calibration. Best of all, the ARP indexer is made from aluminum al-
loy with precision machined threads that allows you to proof the quality of spark plug threads before
installation in expensive cylinder heads. Anodized for protection and quick recognition. For use with
tapered gasket 14mm plugs.
Product Part No.

Spark Plug Indexer 920-0001 s

174
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TOOLS

Tapered
Ring Compressors
ARP’s ring compressors are CNC machined from 6061-T6 billet tube material and feature a true radius
and they are relieved for wire O-rings. Type 3 anodizing is used for long life, and the bore size is
prominently engraved for easy identification. Standard stocking sizes from 3.552˝ to 4.750˝ (SAE) and
75mm to 100mm (metric).
Size Part No. Size Part No. Size Part No. Size Part No. Size Part No. Size Part No.

3.552 899-5520 s 3.880 899-8800 s 4.065 900-0650 s 4.145 900-1450 s 4.250 900-2500 s 4.400 900-4000 s

3.572 899-5720 s 3.890 899-8900 s 4.070 900-0700 s 4.155 900-1550 s 4.255 900-2550 s 4.440 900-4400 s

3.630 899-6300 s 3.900 899-9000 s 4.075 900-0750 s 4.165 900-1650 s 4.260 900-2600 s 4.470 900-4700 s

3.640 899-6400 s 4.000 900-0000 s 4.080 900-0800 s 4.170 900-1700 s 4.270 900-2700 s 4.500 900-5000 s

3.650 899-6500 s 4.005 900-0050 s 4.090 900-0900 s 4.175 900-1750 s 4.280 900-2800 s 4.530 900-5300 s

3.660 899-6600 s 4.010 900-0100 s 4.095 900-0950 s 4.180 900-1800 s 4.290 900-2900 s 4.560 900-5600 s

3.740 899-7400 s 4.016 900-0160 s 4.100 900-1000 s 4.185 900-1850 s 4.300 900-3000 s 4.600 900-6000 s

3.750 899-7500 s 4.020 900-0200 s 4.105 900-1050 s 4.187 900-1870 s 4.310 900-3100 s 4.625 900-6250 s

3.760 899-7600 s 4.030 900-0300 s 4.110 900-1100 s 4.200 900-2000 s 4.320 900-3200 s 4.675 900-6750 s

3.770 899-7700 s 4.036 900-0360 s 4.115 900-1150 s 4.210 900-2100 s 4.330 900-3300 s 4.700 900-7000 s

3.780 899-7800 s 4.040 900-0400 s 4.125 900-1250 s 4.212 900-2125 s 4.350 900-3500 s 4.720 900-7200 s

3.800 899-8000 s 4.055 900-0550 s 4.130 900-1300 s 4.220 900-2200 s 4.360 900-3600 s 4.750 900-7500 s

3.830 899-8300 s 4.056 900-0560 s 4.135 900-1350 s 4.232 900-2325 s 4.375 900-3750 s

3.870 899-8700 s 4.060 900-0600 s 4.140 900-1400 s 4.235 900-2350 s 4.390 900-3900 s

Size Size Size Size Size Size

Part No. Part No. Part No. Part No. Part No. Part No.
(mm) (mm) (mm) (mm) (mm) (mm)

70.00 901-7000 s 79.00 901-7900 s 83.50 901-8350 s 87.25 901-8725 s 91.00 901-9100 s 95.50 901-9550 s

75.00 901-7500 s 79.50 901-7950 s 84.00 901-8400 s 87.50 901-8750 s 91.50 901-9150 s 99.50 901-9950 s

75.50 901-7550 s 80.00 901-8000 s 84.50 901-8450 s 87.75 901-8775 s 92.00 901-9200 s 99.75 901-9975 s

76.00 901-7600 s 80.50 901-8050 s 85.00 901-8500 s 88.00 901-8800 s 92.50 901-9250 s 100.00 901-1000 s

76.50 901-7650 s 81.00 901-8100 s 85.50 901-8550 s 88.50 901-8850 s 93.00 901-9300 s

77.00 901-7700 s 81.50 901-8150 s 86.00 901-8600 s 89.00 901-8900 s 93.50 901-9350 s

77.50 901-7750 s 82.00 901-8200 s 86.25 901-8625 s 89.50 901-8950 s 94.00 901-9400 s

78.00 901-7800 s 82.50 901-8250 s 86.50 901-8650 s 90.00 901-9000 s 94.50 901-9450 s

78.50 901-7850 s 83.00 901-8300 s 87.00 901-8700 s 90.50 901-9050 s 95.00 901-9500 s

175
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TOOLS

Ring Squaring Tools

Side 1 Side 2 Six dual size ring squaring tools designed to
Part No.
mm inch mm inch make fitting piston rings as accurate as possible.
902-8086 s 80 3.150 86 3.386
These tools are CNC machined from 6061-T6
billet tube material and Black Anodized to a
902-8793 s 87 3.425 93 3.661 brilliant finish. The bore sizes are prominently
902-9400 s 94 3.700 100 3.937 engraved for easy identification and range in
902-0107 s 101 3.976 107 4.212
bore sizes from 3.150˝ to 4.800˝ SAE and 80mm
to 122mm Metric.
902-0815 s 108 4.252 115 4.527

902-1622 s 116 4.567 122 4.800

Oil Pump Primer Kits

Those first moments an engine runs prior to building
Application Part No.
oil pressure are when damage can easily occur. ARP’s
CHEVROLET Oil Pump Primer Kit lets you spin the oil pump with
SB & BB and 90˚ V6 - 9.00˝ O.A.L. 130-8802 s a drill motor and bring up the oil pressure prior to
starting the engine. This prevents any unnecessary
FORD
wear or damage to rotating, reciprocating and valve
Small block - 1/4˝ hex drive 150-8801 s train components. ARP’s rugged primer shafts are
351C, 351W, 351M, 400, 429 & 460 - 5/16˝ hex rated at 170,000 psi to ensure extended service life
150-8802 s
drive of this valuable tool. They feature a special billet alu-
minum sleeve that accurately positions the shaft and
keeps it from wobbling.

176
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 APPAREL
Visit our online store - apparel.arp-bolts.com
For the latest selection of ARP apparel
and shop gear, scan the QR code or go to
apparel.arp-bolts.com

177
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 APPAREL
Visit our online store - apparel.arp-bolts.com

178
California Residents l WARNING: Cancer www.P65Warnings.ca.gov. s WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
 TERMS & CONDITIONS

Sales Policy & General Information

Hours of Operation: 7:30 AM to 4:00 PM Monday through Friday (Pacific Standard Time).
Will Call Hours: 8:00 AM to 4:00 PM M-F at Ventura location only.
For technical assistance, direct all written correspondence to:
1863 Eastman Ave, Ventura, CA 93003
E-mail us at: info@arpfasteners.com, or
Visit one of our websites at arp-bolts.com or arpdiesel.com

Product Revisions
ARP® is committed to continuously improving its product line. As such, kits in this catalog
may be revised as needed. California Prop 65 warnings listed in this catalog are subject
to change – see our website for the most current information.

Prices
All prices are subject to change without notice.
ARP encourages local retail sales. In the event there is no supplier or special assistance
is required, you may contact ARP directly at 805-339-2200. A list of worldwide ARP retail-
ers is continually updated at arp-bolts.com.

Orders
Call 800-826-3045 or 805-339-2200 and request the order desk.
FAX orders should be sent to 805-650-0742.
E-mail orders to: arp-esales@arpfasteners.com
Terms
Orders may be paid for using VISA, MasterCard or American Express. All orders and open
accounts are subject to credit approval by ARP.

Shipping
Normal shipping is United Parcel Service Ground.
Next Day Air, 2nd Day Air, and 3-Day Select are also available. Orders must be processed
by 12:00 noon (PST). All orders are shipped freight collect.
Merchandise Returns
Contact a customer service representative if you are not completely satisfied with the per-
formance of a product manufactured by ARP to obtain an RMA. Always include a copy
of the original invoice.

Special Products
Contact our Special Products Department directly at 805-525-1497.

179
TOLL FREE: 800-826-3045
1863 Eastman Ave. Ventura, CA 93003 USA
Local: 805-339-2200 • Fax: 805-650-0742

All ARP Fasteners

Are Proudly Made
In The U.S.A.

ARP-bolts.com