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Nominal Thread Size |
Minor Diameter (After Tapping) |
Suggested Drill Size1 |
F Dim.2 Minimum Drilling Depth for Taps |
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Min. All Classes |
Max Class 3B |
Max Class 2B |
Aluminum |
Steel Magnesium Plastic |
Plug Taps |
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1 |
11/2 |
2 |
21/2 |
3 |
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Unified Coarse |
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2 (.086)-56 3 (.099)-48 4 (.112)-40 |
.0899 .1036 .1175 |
.0961 .1104 .1252 |
.0961 .1104 .1252 |
3/32 (.0938) #36 (.1065) #31 (.1200) |
#41 (.0960) 7/64 (.1094) #31 (.1200) |
.236 .273 .318 |
.279 .323 .374 |
.322 .372 .430 |
.365 .422 .486 |
.408 .471 .542 |
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5 (.125)-40 6 (.138)-32 8 (.164)-32 |
.1305 .1448 .1708 |
.1373 .1527 .1781 |
.1373 .1527 .1781 |
3.4mm (.1339) #26 (.1470) #17 (.1730) |
#29 (.1360) #25 (.1495) #16 (.1770) |
.338 .394 .434 |
.400 .464 .516 |
.462 .532 .598 |
.525 .602 .680 |
.588 .670 .762 |
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10 (.190)-24 12 (.216)-24 1/ 4(.250)-20 |
.1990 .2250 .2608 |
.2080 .2340 .2704 |
.2087 .2347 .2723 |
13/64 (.2031) #1 (.2280) H (.2660) |
#5 (.2055) #1 (.2280) H (.2660) |
.535 .574 .675 |
.630 .682 .800 |
.725 .790 .925 |
.820 .898 1.050 |
.915 1.006 1.175 |
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5/16 (.3125)-18 3/8 (.3750)-16 7/16 (.4375)-14 1/2 (.5000)-13* |
.3245 .3885 .4530 .5166 |
.3342 .3987 .4639 .5273 |
.3372 .4026 .4688 .5335 |
Q (.3320) X (.3970) 29/64 (.4531) 33/64 (.5156) |
Q (.3320) X (.3970) 29/64 (.4531) 17/32 (.5312) |
.801 .750 .867 .962 |
.957 .938 1.086 1.212 |
1.113 1.125 1.305 1.462 |
1.269 1.312 1.524 1.712 |
1.425 1.500 1.743 1.962 |
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9/16 (.5625)-12* 5/8 (.6250)-11 3/4 (.7500)-10 7/8 (.8750)- 9 1 (1.0000)- 8 |
.5806 .6447 .7716 .8990 1.0271 |
.5918 .6564 .7838 .9119 1.0421 |
.5986 .6641 .7926 .9213 1.0521 |
37/64 (.5781) 21/32 (.6562) 25/32 (.7812) 29/32 (.9062) 1-1/32 (1.0312) |
19/32 (.5938) 21/32 (.6562) 25/32 (.7812) 29/32 (.9062) 1-1/32 (1.0312) |
1.062 1.170 1.350 1.542 1.750 |
1.343 1.483 1.725 1.979 2.250 |
1.624 1.795 2.100 2.417 2.750 |
1.905 2.108 2.475 2.854 3.250 |
2.186 2.420 2.850 3.292 3.750 |
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1- 1/8 (1.1250)- 7 1- 1/4 (1.2500)- 7 1- 3/8 (1.3750)- 6 1- 1/2 (1.5000)- 6 |
1.1559 1.2809 1.4110 1.5360 |
1.1730 1.2980 1.4310 1.5560 |
1.1834 1.3084 1.4416 1.5665 |
1-11/64 (1.1719) 1-19/64 (1.2969) 1-27/64 (1.4219) 1-35/64 (1.5469) |
1-11/64 (1.1719) 1-19/64 (1.2969) 1-27/64 (1.4219) 1-35/64 (1.5469) |
1.982 2.107 2.375 2.500 |
2.545 2.732 3.062 3.250 |
3.107 3.357 3.750 4.000 |
3.670 3.982 4.437 4.750 |
4.232 4.607 5.125 5.500 |
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Unified Fine |
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3 (.099)-56 4 (.112)-48 6 (.138)-40 8 (.164)-36 10 (.190)-32 |
.1029 .1166 .1435 .1701 .1968 |
.1086 .1229 .1503 .1771 .2041 |
.1086 .1229 .1503 .1771 .2041 |
#37 (.1040) 3mm (.1181) #26 (.1470) #17 (.1730) #7 (.2010) |
#36 (.1065) #31 (.1200) #25 (.1495) #16 (.1770) 13/64 (.2031) |
.256 .293 .357 .413 .472 |
.305 .349 .426 .495 .568 |
.355 .405 .495 .577 .662 |
.404 .461 .564 .659 .758 |
.454 .517 .633 .741 .852 |
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1/4 (.2500)-28 5/16 (.3125)-24 3/8 (.3750)-24 7/16 (.4375)-20 1/2 (.5000)-20 |
.2577 .3215 .3840 .4483 .5108 |
.2646 .3288 .3910 .4561 .5186 |
.2661 .3312 .3937 .4593 .5223 |
G (.2610) 21/64 (.3281) 25/64 (.3906) 29/64 (.4531) 33/64 (.5156) |
6.7mm (.2638) 21/64 (.3281) 25/64 (.3906) 29/64 (.4531) 33/64 (.5156) |
.589 .718 .625 .738 .800 |
.714 .874 .812 .957 1.050 |
.839 1.030 1.000 1.176 1.300 |
.964 1.186 1.187 1.395 1.550 |
1.089 1.342 1.375 1.614 1.800 |
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9/16 (.5625)-18 5/8 (.6250)-18 3/4 (.7500)-16 7/8 (.8750)-14 1 (1.0000)-121 |
.5745 .6370 .7635 .8905 1.0181 |
.5826 .6451 .7720 .8994 1.0281 |
.5872 .6497 .7776 .9063 1.0361 |
37/64 (.5781) 41/64 (.6406) 49/64 (.7656) 57/64 (.8906) 1-1/64 (1.0156) |
37/64 (.5781) 41/64 (.6406) 49/64 (.7655) 57/64 (.8906) 1-1/32 (1.0312) |
.895 .958 1.125 1.304 1.500 |
1.176 1.271 1.500 1.741 2.000 |
1.457 1.583 1.875 2.179 2.500 |
1.738 1.896 2.250 2.616 3.000 |
2.019 2.208 2.625 3.054 3.500 |
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1-1/8 (1.1250)-121 1-1/4 (1.2500)-121 1-3/8 (1.3750)-121 1-1/2 (1.5000)-121 |
1.1431 1.2681 1.3931 1.5181 |
1.1531 1.2781 1.4031 1.5281 |
1.1611 1.2861 1.4111 1.5361 |
1-9/64 (1.1406) 1-17/64 (1.2656) 1-25/64 (1.3906) 1-33/64 (1.5156) |
1-5/32 (1.1562) 1-9/32 (1.2812) 1-13/32 (1.4062) 1-17/32 (1.5312) |
1.625 1.750 1.875 2.000 |
2.187 2.375 2.562 2.750 |
2.750 3.000 3.250 3.500 |
3.312 3.625 3.937 4.250 |
3.875 4.250 4.625 5.000 |