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Metric Screw Thread Chart: Metric Tap Size Tap Drill (Inches) Clearance Drill (Inches)

This document contains two charts providing specifications for metric and standard screw threads. The metric screw thread chart lists various metric tap and screw sizes from M1.6 to M20 and corresponding recommended tap drill and clearance drill sizes in both inches and millimeters. The standard screw thread chart similarly provides common American National Standard tap drill and clearance drill sizes for standard thread sizes from #0-80 to 1"-12.

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268 views2 pages

Metric Screw Thread Chart: Metric Tap Size Tap Drill (Inches) Clearance Drill (Inches)

This document contains two charts providing specifications for metric and standard screw threads. The metric screw thread chart lists various metric tap and screw sizes from M1.6 to M20 and corresponding recommended tap drill and clearance drill sizes in both inches and millimeters. The standard screw thread chart similarly provides common American National Standard tap drill and clearance drill sizes for standard thread sizes from #0-80 to 1"-12.

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kfctco
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Distributed by: BEST MATERIALS ®

Ph: 800-474-7570, 602-272-8128 Fax: 602-272-8014


www.BestMaterials.com Email: Sales@BestMaterials.com

Metric Screw Thread Chart

Metric Tap Size Tap Drill (Inches) Clearance Drill (Inches)


M1.6 x 0.35 #55 (0.052) #50 (0.070)
M1.8 x 0.35 #53 (0.057) #48 (0.0.76)
M2 x 0.4 #52 (0.063) #45 (0.082)
M3 x 0.5 #39 (0.0995) 1/8 (0.125)
M3.5 x 0.6 #32 (0.116) #28 (0.140)
M4 x 0.7 #29 (0.136) #19 (0.166)
M4.5 x 0.75 #25 (0.1495) #14 (0.182)
M5 x 0.8 #18 (0.169) #7 (0.201)
M6 x 1 #8 (0.199) “C” (0.242)
M7 x 1 “B” (0.238) 9/32 (0.281)
M8 x 1.25 “I” (0.272) “P” (0.323)
M8 x 1 “J” (0.277) “P” (0.323)
M10 x 1.5 “K” (0.339) 13/32 (0.406)
M10 x 1.25 “S” (0.348) 13/32 (0.406)
M12 x 1.75 13/32 (0.406) 31/64 (0.484)
M12 x 1.25 27/64 (0.421) 31/64 (0.484)
M14 x 2 31/64 (0.484) 9/16 (0.562)
M14 x 1.5 1/2 (0.500) 9/16 (0.562)
M16 x 2 9/16 (0.562) 41/64 (0.640)
M16 x 1.5 37/64 (0.578) 41/64 (0.640)
M18 x 2.5 5/8 (0.625) 23/32 (0.718)
M18 x 1.5 21/32 (0.656) 23/32 (0.718)
M20 x 2.5 45/64 (0.703) 13/16 (0.812)
M20 x 1.5 47/64 (0.734) 13/16 (0.812)

Outside Diameter of Screws


mm inch mm inch
1.6 0.063 8.0 0.315
1.8 0.071 10 0.394
2.0 0.078 12 0.472
3.0 0.118 14 0.551
3.5 0.138 16 0.630
4.0 0.157 18 0.708
4.5 0.177 19 0.748
5.0 0.197 20 0.787
6.0 0.236 21 0.827
7.0 0.275 22 0.866
Standard Screw Thread Chart

Standard Thread Size Tap Drill Size (Inches) Clearance Drill Size (Inches)
#0-08 #56 (0.046) 1/16 (0.062)
#1-64 #53 (0.059) #49 (.073)
#1-72 #53 (0.059) #49 (.073)
#2-56 #50 (0.070) #43 (.089)
#2-64 #50 (0.070) #43 (.089)
#3-48 #47 (0.078) #39 (.099)
#3-56 #46 (0.081) #39 (.099)
#4-40 #43 (0.089) 1/8 (0.125)
#4-48 #42 (0.093) 1/8 (0.125)
#5-40 #39 (0.099) #30 (0.128)
#6-32 #36 (0.106) #27 (0.144)
#6-40 #33 (0.113) #27 (0.144)
#8-32 #29 (0.136) #17 (0.173)
#10-24 #25 (0.149) #7 (0.201)
#10-32 #21 (0.159) #7 (0.201)
1/4-20 #7 (0.201) “G” (0.261)
1/4-28 #3 (0.213) “G” (0.261)
5/16-18 “F” (0.257) “P” (0.323)
5/16-24 “I” (0.272) “P” (0.323)
3/8-16 5/16 (0.312) “V” (0.377)
3/8-24 “Q” (0.332) “V” (0.377)
7/16-14 “U” (0.368) 29/64 (0.453)
7/16-20 “W” (0.386) 29/64 (0.453)
1/2-13 27/64 (0.442) 33/64 (0.515)
1/2-20 29/64 (0.453) 33/64 (0.515)
5/8-11 17/32 (0.531) 41/64 (0.641)
5/8-18 37/64 (0.578) 41/64 (0.641)
3/4-10 21/32 (0.656) 49/64 (0.766)
3/4-16 11/16 (0.687) 49/64 (0.766)
7/8-14 13/16 (0.812) 57/64 (0.890)
1”-8 7/8 (0.875) 1-1/32 (1.032)
1”-12 59/64 (0.922) 1-1/32 (1.032)

The values listed in the chart above are the recommended values for a class 2 thread fit.
The clearance drill sizes listed are the most commonly used sizes.

#0 DIA = 0.059 #1 DIA = 0.073 #2 DIA = 0.086 #3 DIA = 0.099 #4 DIA = 0.112
#5 DIA = 0.125 #6 DIA = 0.138 #8 DIA = 0.164 #10 DIA = 0.189 #12 DIA = 0.216

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