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Unified Fine Thread Drilling Data

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The minimum drilling depths shown below allow for the following recommended practices:
  1. Countersinking the drilled hole to prevent a feather edge at the start of the tapped hole.
  2. 3/4 - 1-1/2 pitch of insert "set-down" to allow for maximum production tolerance. Dimensions are shown for both plug and bottoming taps.





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  Results 1 - 21 of 21 1 

Item #

Nominal Thread Size

Aluminum Suggested Drill Size

Steel, Magnesium, Plastic Suggested Drill Size

1 Diameter Plug Taps

1-1/2 Diameter Plug Taps

2 Diameter Plug Taps

2 - 642.35 mm 2 (.086) - 64 2.35 mm (.0925) 2.35 mm (.0925) .223 in .266 in .309 in
3 - 5637 3 (.099) - 56 # 37 (.1040) # 36 (.1065) .256 in .305 in .355 in
4 - 483 mm 4 (.112) - 48 3 mm (.1181) # 31 (.1200) .293 in .349 in .405 in
6 - 4026 6 (.138) - 40 # 26 (.1470) # 25 (.1495) .357 in .426 in .495 in
8 - 3617 8 (.164) - 36 # 17 (.1730) #16 (.1770) .413 in .495 in .577 in
10 - 327 10 (.190) - 32 # 7 (.2010) 13/64 (.2031) .472 in .568 in .662 in
1/4 - 28 G 1/4 (.2500) - 28 G (.2610) 6.7 mm (.2638) .589 in .714 in .839 in
5/16 - 2421/64 5/16 (.3125) - 24 21/64 (.3281) 21/64 (.3281) .718 in .874 in 1.030 in
3/8 - 2425/64 3/8 (.3750) - 24 25/64 (.3906) 25/64 (.3906) .625 in .812 in 1.000 in
7/16 - 2029/64 7/16 (.4375) - 20 29/64 (.4531) 29/64 (.4531) .738 in .957 in 1.176 in
1/2 - 2033/64 1/2 (.5000) - 20 33/64 (.5156) 33/64 (.5156) .800 in 1.050 in 1.300 in
9/16 - 1837/64 9/16 (.5625) - 18 37/64 (.5781) 37/64 (.5781) .895 in 1.176 in 1.457 in
5/8 - 1841/64 5/8 (.6250) - 18 41/64 (.6406) 41/64 (.6406) .958 in 1.271 in 1.583 in
3/4 - 1649/64 3/4 (.7500) - 16 49/64 (.7656) 49/64 (.7656) 1.125 in 1.500 in 1.875 in
7/8 - 1457/64 7/8 (.8750) - 14 57/64 (.8906) 57/64 (.8906) 1.304 in 1.741 in 2.179 in
1 - 141 - 1/64 1 (1.000) - 14 1-1/64 (1.0156) 1-1/32 (1.0312) 1.429 in 1.929 in 2.429 in
1 - 121 - 1/64 1 (1.000) - 12 1-1/64 (1.0156) 1-1/32 (1.0312) 1.500 in 2.000 in 2.500 in
1 -1/8-121-9/64 1 - 1/8 (1.1250) - 12 1-9/64 (1.1406) 1-5/32 (1.1562) 1.625 in 2.187 in 2.750 in
1-1/4-121-17/64 1 - 1/4 (1.2500) - 12 1-17/64 (1.2656) 1-9/32 (1.2812) 1.750 in 2.375 in 3.000 in
1-3/8-121-25/64 1 - 3/8 (1.3750) - 12 1-25/64 (1.3906) 1-13/32 (1.4062) 1.875 in 2.562 in 3.250 in
1-1/2-121-33/64 1 - 1/2 (1.5000) - 12 1-33/64 (1.5156) 1-17/32 (1.5312) 2.000 in 2.750 in 3.500 in
  Results 1 - 21 of 21 1