Tap Drill Chart

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Categories: [Reference Charts]

Screw SizeMajor DiameterThreads per inchMinor DiameterTap Drill
75% Thread
Aluminum, Brass, Plastics		50% Thread
Steel, Stainless, Iron
drill sizediameterdrill sizediameter
0.060080.04473/64.046955.0520
1.073064.053853.05951/16.0625
1.073072.056053.059552.0635
2.086056.064150.070049.0730
2.086064.066850.070048.0760
3.099048.073447.078544.0860
3.099056.077145.082043.0890
4.112040.081343.089041.0960
4.112048.086442.093540.0980
5.12540.094338.10157/64.1094
5.12544.097137.104035.1100
6.13832.099736.106532.1160
6.13840.107333.113031.1200
8.164032.125729.136027.1440
8.164036.129929.136026.1470
10.190024.138925.149520.1610
10.190032.151721.159018.1695
12.216024.164916.177012.1890
12.216028.172214.182010.1935
12.216032.177713.18509.1960
1/4.250020.18877.20107/32.2188
1/4.250028.20623.21301.2280
1/4.250032.21177/32.21881.2280
5/16.312518.2443F.2570J.2770
5/16.312524.2614I.27209/32.2812
5/16.312532.27429/32.2812L.2900
3/8.375016.29835/16.3125Q.3320
3/8.375024.3239Q.3320S.3480
3/8.375032.336711/32.3438T.3580
7/16.437514.3499U.368025/64.3906
7/16.437520.376225/64.390613/32.4062
7/16.437528.3937Y.4040Z.4130
1/2.500013.405627/64.421929/64.4531
1/2.500020.438729/64.453115/32.4688
1/2.500028.456215/32.468815/32.4688
9/16.562512.460331/64.484433/64.5156
9/16.562518.494333/64.515617/32.5312
9/16.562524.511433/64.515617/32.5312
5/8.625011.513517/32.53129/16.5625
5/8.625018.556837/64.578119/32.5938
5/8.625024.573937/64.578119/32.5938
11/16.687524.636441/64.640621/32.6562
3/4.750010.627321/32.656211/16.6875
3/4.750016.673311/16.687545/64.7031
3/4.750020.688745/64.703123/32.7188
13/16.812520.751249/64.765625/32.7812
7/8.87509.738749/64.765651/64.7969
7/8.875014.787413/16.812553/64.8281
7/8.875020.813753/64.828127/32.8438
15/16.937520.876257/64.890629/32.9062
11.0008.84667/8.875059/64.9219
11.00012.897815/16.937561/64.9531
11.00020.938761/64.953131/32.9688