General Bolt Torque
Bolt torque depends on:
• Bolt size, type and grade
• Lubrication (a low friction factor must be considered with MoS2-based grease)
The given bolt torques are based on the 90% of the bolt yield strength
Friction factor μ = 0.1
Friction factor μ = 0.14
SIZE GRADE (MoS2)
Torque Torque Pre Tension
metric Torque Torque Pre Tension
Nm ft.lbs. kN
Nm ft.lbs. kN
M8x1.25 8.8 20 15 17.9 25 18 16.5
10.9 30 22 26.3 37 27 24.3
12.9 35 26 30.8 43 32 28.4
M10x1.5 8.8 40 30 28.5 50 40 26.3
10.9 60 40 41.8 70 50 38.7
12.9 70 50 49.0 90 70 45.3
M12x1.75 8.8 70 50 41.5 90 70 38.4
10.9 100 70 61.0 130 100 56.4
12.9 120 90 71.4 150 110 66.0
M14x2 8.8 110 80 56.8 140 100 52.5
10.9 160 120 83.4 200 150 77.2
12.9 190 140 97.6 240 180 90.3
M16x2 8.8 170 130 78.5 220 160 72.7
10.9 250 180 115.3 320 240 106.8
12.9 300 220 134.9 370 270 125.0
M18x2.5 8.8 240 180 95.1 300 220 88.1
10.9 350 260 139.7 430 320 129.3
12.9 410 300 163.5 510 380 151.3
M20x2.5 8.8 340 250 122.5 420 310 113.6
10.9 500 370 180.0 620 460 166.8
12.9 580 430 210.6 720 530 195.2
M22x2.5 8.8 460 340 152.7 570 420 141.7
10.9 670 490 224.3 840 620 208.1
12.9 790 580 262.4 990 730 243.5
M24x3 8.8 580 430 176.5 730 540 163.6
10.9 860 630 259.2 1070 790 240.2
12.9 1000 740 303.3 1250 920 281.1
M27x 3 8.8 850 630 231.6 1070 790 214.9
10.9 1250 920 340.1 1570 1160 315.7
12.9 1460 1080 398.0 1830 1350 369.4
M30x3.5 8.8 1160 860 282.0 1450 1070 261.6
10.9 1700 1250 414.2 2120 1560 384.2
12.9 1990 1470 484.7 2480 1830 449.6
M36x4 8.8 2020 1490 412.2 2530 1870 382.6
10.9 2970 2190 605.4 3710 2740 561.9
12.9 3470 2560 708.5 4350 3210 657.5
M42x4.5 8.8 3230 2380 567.0 4050 2990 526.5
10.9 4750 3500 832.8 5950 4390 773.2
12.9 5560 4100 974.6 6960 5130 904.9
95
General Bolt Torque
Bolt torque depends on:
• Bolt size, type and grade
• Lubrication (a low friction factor must be considered with MoS2-based grease)
The given bolt torques are based on the 90% of the bolt yield strength
SIZE Torque Torque Pre Tension Torque Torque Pre Tension
GRADE
inch Nm ft.lbs. kips Nm ft.lbs. kips
1/4 20 5 8 6 2.0 10 7 1.8
20 8 12 9 2.8 14 10 2.6
5/16 18 5 17 13 3.3 21 15 3.1
18 8 24 18 4.7 29 22 4.3
3/8 16 5 30 22 5.0 37 27 4.6
16 8 43 31 7.0 52 38 6.5
7/16 14 5 48 36 6.9 59 44 6.3
14 8 68 50 9.7 83 62 8.9
1/2 13 5 74 54 9.2 90 67 8.5
13 8 104 77 13.0 128 94 12.0
9/16 12 5 106 78 11.9 131 96 11.0
12 8 150 110 16.8 185 136 15.5
5/8 11 5 146 108 14.8 181 133 13.7
11 8 207 152 20.9 255 188 19.3
11/16 11 5 200 148 18.6 248 183 17.2
11 8 283 209 26.2 351 259 24.3
3/4 10 5 260 191 22.1 322 237 20.4
10 8 366 270 31.1 454 335 28.8
7/8 9 5 418 308 30.6 519 383 28.3
9 8 590 435 43.2 732 540 40.0
1 8 5 626 462 40.2 778 574 37.2
8 8 884 652 56.7 1099 810 52.5
1-1/8 7 5 773 570 44.0 960 708 40.8
7 8 1253 924 71.4 1557 1148 66.1
1-1/4 7 5 1087 802 56.4 1358 1001 52.3
7 8 1763 1300 91.4 2202 1624 84.7
1-3/8 6 5 1427 1053 66.9 1778 1311 61.9
6 8 2315 1707 108.4 2883 2126 100.5
1-1/2 6 5 1891 1394 81.9 2364 1744 76.0
6 8 3066 2261 132.8 3834 2827 123.2
1-5/8 5 5 2347 1731 92.9 2921 2154 86.0
5 8 3807 2807 150.6 4737 3493 139.5
1-3/4 5 5 2984 2200 110.5 3726 2748 102.4
5 8 4838 3568 179.1 6043 4456 166.1
2 4.5 5 4482 3305 145.6 5604 4133 135.1
4.5 8 7267 5359 236.1 9088 6702 219.0
96
