Reference
Tap Drill Size
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 1/16 | 64 | 0.0422 | 3/64 | 0.0469 |
| 1/16 | 72 | 0.0425 | 3/64 | 0.0469 |
| 5/64 | 60 | 0.0563 | 1/16 | 0.0625 |
| 5/64 | 72 | 0.0601 | 52 | 0.0635 |
| 3/32 | 48 | 0.0667 | 49 | 0.0730 |
| 3/32 | 50 | 0.0678 | 49 | 0.0730 |
| 7/64 | 48 | 0.0823 | 43 | 0.0890 |
| 1/8 | 32 | 0.0844 | 3/32 | 0.0937 |
| 1/8 | 40 | 0.0925 | 38 | 0.1015 |
| 9/64 | 40 | 0.1081 | 32 | 0.1160 |
| 5/32 | 32 | 0.1157 | 1/8 | 0.1250 |
| 5/32 | 36 | 0.1202 | 30 | 0.1285 |
| 11/64 | 32 | 0.1313 | 9/64 | 0.1406 |
| 3/16 | 24 | 0.1334 | 26 | 0.1470 |
| - | - | - | - | - |
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 3/16 | 32 | 0.1469 | 22 | 0.1570 |
| 13/64 | 24 | 0.1490 | 20 | 0.1610 |
| 7/32 | 24 | 0.1646 | 16 | 0.1770 |
| 7/32 | 32 | 0.1782 | 12 | 0.1890 |
| 15/64 | 24 | 0.1806 | 10 | 0.1935 |
| 1/4 | 20 | 0.1850 | 7 | 0.2010 |
| 1/4 | 24 | 0.1959 | 4 | 0.2090 |
| 1/4 | 27 | 0.2019 | 3 | 0.2130 |
| 1/4 | 28 | 0.2036 | 3 | 0.2130 |
| 1/4 | 32 | 0.2094 | 7/32 | 0.2187 |
| 5/16 | 18 | 0.2403 | F | 0.2570 |
| 5/16 | 20 | 0.2476 | 17-64 | 0.2656 |
| 5/16 | 24 | 0.2584 | I | 0.2720 |
| 5/16 | 27 | 0.2644 | J | 0.2770 |
| 5/16 | 32 | 0.2719 | 9/32 | 0.2812 |
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 3/8 | 16 | 0.2938 | 5/16 | 0.3125 |
| 3/8 | 20 | 0.3100 | 21/64 | 0.3281 |
| 3/8 | 24 | 0.3209 | Q | 0.3320 |
| 3/8 | 27 | 0.3269 | R | 0.3390 |
| 7/16 | 14 | 0.3447 | U | 0.3680 |
| 7/16 | 20 | 0.3726 | 25/64 | 0.3906 |
| 7/16 | 24 | 0.3834 | X | 0.3970 |
| 7/16 | 27 | 0.3894 | Y | 0.4040 |
| 1/2 | 12 | 0.3918 | 27/64 | 0.4219 |
| 1/2 | 13 | 0.4001 | 27/64 | 0.4219 |
| 1/2 | 20 | 0.4351 | 29/64 | 0.4531 |
| 1/2 | 24 | 0.4459 | 29/64 | 0.4531 |
| 1/2 | 27 | 0.4519 | 15/32 | 0.4687 |
| 9/16 | 12 | 0.4542 | 31/64 | 0.4844 |
| 9/16 | 18 | 0.4903 | 33/64 | 0.5156 |
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 9/16 | 27 | 0.5144 | 17/32 | 0.5312 |
| 5/8 | 11 | 0.5069 | 17/32 | 0.5312 |
| 5/8 | 12 | 0.5168 | 35/64 | 0.5469 |
| 5/8 | 18 | 0.5528 | 37/64 | 0.5781 |
| 5/8 | 27 | 0.5769 | 19/32 | 0.5937 |
| 11/16 | 11 | 0.5694 | 19/32 | 0.5937 |
| 11/16 | 16 | 0.6063 | 5/8 | 0.6250 |
| 3/4 | 10 | 0.6201 | 21/32 | 0.6562 |
| 3/4 | 12 | 0.6418 | 43/64 | 0.6719 |
| 3/4 | 16 | 0.6688 | 11/16 | 0.6875 |
| 3/4 | 27 | 0.7019 | 23/32 | 0.7187 |
| 13/16 | 10 | 0.6826 | 23/32 | 0.7178 |
| 7/8 | 9 | 0.7307 | 49/64 | 0.7656 |
| 7/8 | 12 | 0.7668 | 51/64 | 0.7969 |
| - | - | - | - | - |
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 7/8 | 14 | 0.7822 | 13/16 | 0.8125 |
| 7/8 | 18 | 0.8028 | 53/64 | 0.8281 |
| 7/8 | 27 | 0.8269 | 27/32 | 0.8437 |
| 15/16 | 9 | 0.7932 | 53/64 | 0.8281 |
| 1 | 8 | 0.8376 | 7/8 | 0.8750 |
| 1 | 12 | 0.8918 | 59/64 | 0.9219 |
| 1 | 14 | 0.9072 | 15/16 | 0.9375 |
| 1 | 27 | 0.9519 | 31/32 | 0.9687 |
| 1 1/8 | 7 | 0.9394 | 63/64 | 0.9844 |
| 1 1/8 | 12 | 1.0168 | 1 3/64 | 1.0469 |
| 1 1/8 | 12 | 1.1418 | 1 11/64 | 1.1719 |
| 1 3/8 | 6 | 1.1585 | 1 7/32 | 1.2187 |
| Size | Thread | Root | Drill Size | Decimal |
|---|---|---|---|---|
| 1 3/8 | 12 | 1.2668 | 1 19/64 | 1.2969 |
| 1 1/2 | 6 | 1.2835 | 1 11/32 | 1.3437 |
| 1 1/2 | 12 | 1.3918 | 1 27/64 | 1.4219 |
| 1 5/8 | 5.5 | 1.3888 | 1 29/64 | 1.4531 |
| 1 3/4 | 5 | 1.4902 | 1 9/16 | 1.5625 |
| 1 7/8 | 5 | 1.6152 | 1 11/16 | 1.6875 |
| 2 | 4.5 | 1.7113 | 1 25/32 | 1.7812 |
| 2 1/8 | 4.5 | 1.8363 | 1 29/32 | 1.9062 |
| 2 1/4 | 4.5 | 1.9613 | 21/32 | 2.0312 |
| 2 3/8 | 4 | 2.0502 | 2 1/8 | 2.1250 |
| 2 1/2 | 4 | 2.1752 | 2 1/4 | 2.2500 |
| - | - | - | - | - |
Tap Drill Sizes for Pipe Thread
| Pipe Size | Drill Size - Briggs | Drill Size - Whitworth |
|---|---|---|
| 1/8 | 11/32 | 5/16 |
| 1/4 | 7/16 | 27/64 |
| 3/8 | 19/32 | 9/16 |
| 1/2 | 23/32 | 11/16 |
| 3/4 | 15/16 | 29/32 |
| 1 | 5/32 | 1 1/8 |
| 1 1/4 | 1 1/2 | 1 15/32 |
| 1 1/2 | 1 23/32 | 1 25/32 |
| 2 | 2 3/16 | 2 5/32 |
| 2 1/2 | 2 5/8 | 2 25/32 |
| 3 | 3 1/4 | 3 9/32 |
| 3 1/4 | 3 3/4 | 3 3/4 |
| 4 | 4 1/4 | 4 1/4 |
| 4 1/2 | 4 3/4 | 4 3/4 |
| 5 | 5 5/16 | 5 1/4 |
| 6 | 6 3/8 | 6 1/4 |
Tons of Pressure Required to Punch Mild Steel
| Round Hole Diameter | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (inches) | .125 | .188 | .250 | .312 | .375 | .437 | .500 | .562 | .625 | .687 | .750 | .813 | .875 | .937 | 1.00 | 1.50 | 2.00 |
| Ga. | In. | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | .036 | .4 | .5 | .7 | .9 | 1.1 | 1.2 | 1.4 | 1.6 | 1.8 | 1.9 | 2.1 | 2.3 | 2.5 | 2.6 | 2.8 | 4.2 | 5.6 |
| 18 | .036 | .5 | .7 | .9 | 1.2 | 1.4 | 1.6 | 1.9 | 2.1 | 2.4 | 2.6 | 2.8 | 3.1 | 3.3 | 3.5 | 3.8 | 5.5 | 7.5 |
| 16 | .062 | .6 | .9 | 1.2 | 1.5 | 1.8 | 2.1 | 2.3 | 2.6 | 2.9 | 3.2 | 3.5 | 3.8 | 4.1 | 4.3 | 4.7 | 7.0 | 9.5 |
| 114 | 0.75 | .7 | 1.1 | 1.5 | 1.8 | 2.2 | 2.6 | 2.9 | 3.3 | 3.7 | 4.0 | 4.4 | 4.8 | 5.1 | 5.5 | 5.9 | 8.8 | 11.7 |
| 12 | .105 | 1.0 | 1.5 | 2.1 | 2.6 | 3.1 | 3.6 | 4.1 | 4.6 | 5.1 | 5.7 | 6.2 | 6.7 | 7.2 | 7.7 | 8.2 | 12.3 | 16.4 |
| 11 | .120 | 1.2 | 1.8 | 2.4 | 2.9 | 3.5 | 4.1 | 4.7 | 5.1 | 5.9 | 6.2 | 7.1 | 7.6 | 8.3 | 8.8 | 9.4 | 14.0 | 18.8 |
| 10 | .135 | 1.3 | 2.0 | 2.6 | 3.3 | 4.0 | 4.6 | 5.3 | 5.9 | 6.6 | 7.3 | 7.9 | 8.6 | 9.2 | 9.9 | 10.6 | 15.9 | 21.0 |
| 3/16 | .188 | - | 2.8 | 3.7 | 4.6 | 5.5 | 6.4 | 7.4 | 8.3 | 9.2 | 10.1 | 11.0 | 12.0 | 12.9 | 13.8 | 14.8 | 22.0 | 29.5 |
| 1/4 | .250 | - | - | 4.9 | 6.1 | 7.4 | 8.6 | 9.8 | 11.1 | 12.3 | 13.5 | 14.7 | 16.0 | 17.2 | 18.4 | 19.7 | 34.4 | 39.3 |
| 5/16 | .312 | - | - | - | 7.8 | 9.2 | 10.7 | 12.3 | 13.9 | 15.4 | 17.0 | 18.5 | 20.0 | 21.5 | 23.0 | 24.6 | 43.0 | 49.0 |
| 3/8 | .375 | - | - | - | - | 11.1 | 12.8 | 14.8 | 16.6 | 18.5 | 20.2 | 22.1 | 23.8 | 25.8 | 27.5 | 29.5 | 51.5 | 59.0 |
| 1/2 | .500 | - | - | - | - | - | - | 19.7 | 22.0 | 24.6 | 26.9 | 29.5 | 31.8 | 34.4 | 36.8 | 39.4 | 68.8 | 78.5 |
Punch Clearance for Mild Steel
| Gauge or Size | Approx. Decimal Thickness | Overall Clearance |
|---|---|---|
| 30 | .0120 | slip fit |
| 28 | .0149 | slip fit |
| 26 | .0179 | slip fit |
| 24 | .0239 | .003 |
| 22 | .0299 | .003 |
| 20 | .0359 | .004 |
| 18 | .0478 | .005 |
| 16 | .0598 | .005 |
| 14 | .0747 | .006 |
| 13 | .0897 | .009 |
| 12 | .1046 | .009 |
| 11 | .1196 | .011 |
| .011 | .125 | .011 |
| 10 | .1345 | .013 |
| 5/32" | .156 | .015 |
| 8 | .164 | .017 |
| 7 | .1793 | .021 |
| 3/16" | .1875 | .023 |
| 1/4" | .250 | .037 |
| 5/16" | .3125 | .047 |
| 3/8" | .375 | .157 |
| 1/2" | .500 | .075 |
| 5/8" | .625 | .125 |
| 3/4" | .750 | .150 |
Tons of Pressure Required to Shear 1 Inch Length
| Metal Gauge | Mild Steel | Stainless Steel | Brass |
|---|---|---|---|
| 20 | 1.01 | 1.50 | 0.75 |
| 18 | 1.25 | 1.75 | 1.00 |
| 16 | 1.75 | 2.50 | 1.25 |
| 13 | 2.50 | 3.50 | 2.00 |
| 11 | 3.25 | 4.75 | 2.25 |
| 3/16" | 4.25 | 7.00 | 3.25 |
| 1/4" | 6.25 | 9.50 | 4.50 |
| 5/16" | 8.00 | 12.00 | 5.50 |
| 3/8" | 9.50 | 14.25 | 6.25 |
| 7/16" | 11.00 | 16.50 | 7.75 |
| 1/2" | 12.50 | 18.75 | 8.75 |
| 5/8" | 15.75 | 23.50 | 11.00 |
| 3/4" | 18.75 | 28.25 | 13.25 |
| 7/8" | 22.00 | 33.00 | 15.50 |
| 1" | 25.00 | 37.50 | 17.50 |