Drilling Depth (UNC)
| Nominal Diameter | Pitch (mm) | Drill Bit Diameter (mm) | Drilling Diameter | Tap | Drilling Depth | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| min. | max. | Min Outer Diameter | 1d | 1.5d | 2d | 2.5d | 3d | |||
| 2-56 | 0.453 | 2.4 | 2.30 | 2.50 | 2.77 | 4.2 | 5.3 | 6.4 | 7.5 | 8.6 |
| 3-48 | 0.529 | 2.7 | 2.65 | 2.80 | 3.20 | 4.9 | 6.2 | 7.4 | 8.7 | 10.0 |
| 4-40 | 0.635 | 3.1 | 3.00 | 3.15 | 3.67 | 5.7 | 7.1 | 8.6 | 10.0 | 11.4 |
| 5-40 | 0.635 | 3.4 | 3.33 | 3.50 | 4.00 | 6 | 7.6 | 9.2 | 10.8 | 12.4 |
| 6-32 | 0.794 | 3.8 | 3.68 | 3.89 | 4.54 | 7.1 | 8.8 | 10.6 | 12.3 | 14.1 |
| 8-32 | 0.794 | 4.4 | 4.34 | 4.52 | 5.20 | 7.7 | 9.8 | 11.9 | 14.0 | 16.1 |
| 10-24 | 1.058 | 5.2 | 5.06 | 5.28 | 6.20 | 9.6 | 12.0 | 14.4 | 16.8 | 19.2 |
| 12-24 | 1.058 | 5.8 | 5.72 | 5.92 | 6.86 | 10.3 | 13.0 | 15.7 | 18.5 | 21.3 |
| 1/4-20 | 1.270 | 6.7 | 6.62 | 6.86 | 8.00 | 12.1 | 15.2 | 18.4 | 21.6 | 24.8 |
| 5/16-18 | 1.411 | 8.4 | 8.24 | 8.49 | 9.77 | 14.3 | 18.3 | 22.2 | 26.2 | 30.2 |
| 3/8-16 | 1.588 | 10.0 | 9.89 | 10.12 | 11.59 | 16.7 | 21.4 | 26.2 | 31.0 | 35.7 |
| 7/16-14 | 1.814 | 11.6 | 11.51 | 11.78 | 13.47 | 19.3 | 24.8 | 30.4 | 35.9 | 41.5 |
| 1/2-13 | 1.954 | 13.2 | 13.12 | 13.40 | 15.24 | 21.5 | 27.8 | 34.2 | 40.5 | 46.9 |
| 9/16-12 | 2.117 | 14.9 | 14.75 | 15.03 | 17.04 | 23.8 | 31.0 | 38.1 | 45.2 | 52.4 |
| 5/8-11 | 2.309 | 16.5 | 16.38 | 16.68 | 18.88 | 26.3 | 34.2 | 42.1 | 50.1 | 58.0 |
| 3/4-10 | 2.540 | 19.8 | 19.60 | 19.91 | 22.35 | 30.5 | 40.0 | 49.5 | 59.0 | 68.6 |
| 7/8-9 | 2.822 | 23.0 | 22.84 | 23.18 | 25.89 | 34.9 | 46.0 | 57.2 | 68.3 | 79.4 |
| 1"-8 | 3.175 | 26.4 | 26.09 | 26.47 | 29.53 | 39.7 | 52.4 | 65.1 | 77.8 | 90.5 |
| 1" 1/8-7 | 3.629 | 29.5 | 29.36 | 29.74 | 33.29 | 44.9 | 59.2 | 73.5 | 87.8 | 102.0 |
| 1" 1/4-7 | 3.629 | 32.8 | 32.54 | 32.92 | 36.46 | 48.1 | 64.0 | 79.8 | 96.0 | 111.8 |
| 1" 3/8-6 | 4.234 | 36.2 | 35.84 | 36.35 | 40.42 | 54.0 | 71.4 | 88.9 | 106.0 | 124.0 |
| 1" 1/2-6 | 4.234 | 39.5 | 39.02 | 39.53 | 43.62 | 57.2 | 76.2 | 95.3 | 115.0 | 133.0 |
*All information is strictly informative