Size Outside Dia Inch Tpi Pitch Inch Core Dia Inch Radius Inch Thread Depth Thou Hex A/flats Inch Head Depth Inch Washer Face Dia Inch Standard Nut Depth Inch Lock Nut Depth Inch Tapping Drill Size Inch Tapping Drill Size mm Letter Or Number Id
3/16 0.188 32 0.031 0.148 0.004 20 0.338 0.156 3.9 5/32 1
7/32 0.219 28 0.036 0.173 0.005 23 0.183 4.6 14 2
1/4 0.250 26 0.039 0.201 0.005 25 0.445 0.176 0.428 0.200 0.185 0.209 5.3 4 3
9/32 0.281 26 0.039 0.232 0.005 25 0.238 6.0 B 4
5/16 0.313 22 0.045 0.254 0.006 29 0.525 0.218 0.508 0.250 0.210 0.266 6.7 17/64 5
3/8 0.375 20 0.050 0.311 0.007 32 0.600 0.260 0.582 0.312 0.260 0.323 8.2 P 6
7/16 0.438 18 0.056 0.366 0.008 36 0.710 0.302 0.690 0.375 0.275 0.375 9.7 3/8 7
1/2 0.500 16 0.063 0.420 0.009 40 0.820 0.343 0.800 0.437 0.300 0.438 11.0 7/16 8
9/16 0.563 16 0.063 0.483 0.009 40 0.920 0.375 0.900 0.500 0.333 0.500 12.6 1/2 9
5/8 0.625 14 0.071 0.534 0.010 46 1.010 0.417 0.985 0.562 0.375 0.547 14.0 35/64 10
11/16 0.688 14 0.071 0.596 0.010 46 1.100 0.609 15.5 39/64 11
3/4 0.750 12 0.083 0.643 0.011 53 1.200 0.500 1.175 0.687 0.458 0.656 16.7 21/32 12
13/16 0.813 12 0.083 0.706 0.011 53 0.719 18.3 23/32 13
7/8 0.875 11 0.091 0.759 0.013 58 1.300 0.583 1.273 0.750 0.500 0.781 19.7 25/32 14
1 1.000 10 0.100 0.872 0.014 64 1.480 0.666 1.453 0.875 0.583 0.891 22.7 57/64 15
1 1/8 1.125 9 0.111 0.983 0.015 71 1.670 0.750 1.620 1.000 0.666 1.000 25.4 1 16
1 1/4 1.250 9 0.111 1.108 0.015 71 1.860 0.830 1.795 1.125 0.750 1.125 28.6 1 - 1/8 17
1 3/8 1.375 8 0.125 1.215 0.017 80 2.050 0.920 1.985 1.250 0.833 1.234 31.5 1 - 15/64 18
1 1/2 1.500 8 0.125 1.340 0.017 80 2.220 1.000 2.155 1.375 0.916 1.359 34.5 1 - 23/64 19
1 5/8 1.625 8 0.125 1.465 0.017 80 2.410 1.486 37.8 1 - 15/32 20
1 3/4 1.750 7 0.143 1.567 0.020 92 2.580 1.170 2.495 1.625 1.083 1.600 40.7 1 - 5/8 21
2 2.000 7 0.143 1.817 0.020 92 2.760 1.330 2.675 1.750 1.166 1.835 46.6 1 - 27/32 22
2 1/4 2.250 6 0.167 2.036 0.023 107 3.150 2.050 52.4 2 - 1/16 23
2 1/2 2.500 6 0.167 2.286 0.023 107 3.550 2.330 59.0 2 - 5/16 24
2 3/4 2.750 6 0.167 2.536 0.023 107 3.890 2.560 65.0 2 - 9/16 25
3 3.000 5 0.200 2.743 0.028 128 4.187 2.780 70.6 2 - 25/32 26