Drilling Depth (UNF)
| 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 | |||
| 2-64 | 0.396 | 2.3 | 2.29 | 2.44 | 2.70 | 4.0 | 5.0 | 6.2 | 7.3 | 8.3 |
| 3-56 | 0.453 | 2.7 | 2.62 | 2.77 | 3.10 | 4.6 | 5.8 | 7.1 | 8.4 | 9.6 |
| 4-48 | 0.529 | 3.0 | 2.97 | 3.14 | 3.53 | 5.2 | 6.7 | 8.1 | 9.5 | 10.9 |
| 6-40 | 0.635 | 3.8 | 3.66 | 3.81 | 4.33 | 6.4 | 8.1 | 9.9 | 11.6 | 13.4 |
| 8-36 | 0.706 | 4.4 | 4.32 | 4.47 | 5.08 | 7.3 | 9.4 | 11.5 | 13.6 | 15.7 |
| 10-32 | 0.794 | 5.1 | 5.00 | 5.16 | 5.86 | 8.4 | 10.8 | 13.2 | 15.6 | 18.0 |
| 1/4-28 | 0.907 | 6.7 | 6.55 | 6.72 | 7.53 | 10.4 | 13.6 | 16.8 | 20.0 | 23.2 |
| 5/16-24 | 1.058 | 8.3 | 8.17 | 8.35 | 9.31 | 12.7 | 16.7 | 20.6 | 24.6 | 28.6 |
| 3/8-24 | 1.058 | 9.9 | 9.75 | 9.93 | 10.90 | 14.3 | 19.1 | 23.8 | 28.6 | 33.3 |
| 7/16-20 | 1.270 | 11.5 | 11.39 | 11.59 | 12.76 | 16.8 | 22.4 | 27.9 | 33.5 | 39.0 |
| 1/2-20 | 1.270 | 13.1 | 12.97 | 13.16 | 14.35 | 18.4 | 24.8 | 31.1 | 37.5 | 43.8 |
| 9/16-18 | 1.411 | 14.7 | 14.59 | 14.79 | 16.12 | 20.6 | 27.8 | 34.9 | 42.1 | 49.2 |
| 5/8-18 | 1.411 | 16.3 | 16.18 | 16.38 | 17.71 | 22.2 | 30.2 | 38.1 | 46.0 | 54.0 |
| 3/4-16 | 1.588 | 19.5 | 19.39 | 19.60 | 21.11 | 26.2 | 35.7 | 45.2 | 54.8 | 64.3 |
| 7/8-14 | 1.814 | 22.7 | 22.62 | 22.84 | 24.58 | 30.4 | 41.5 | 52.6 | 63.7 | 74.8 |
| 1"-14 | 1.814 | 26.0 | 25.86 | 26.11 | 27.76 | 33.6 | 46.3 | 59.0 | 71.7 | 84.4 |
| 1"-12 | 2.117 | 26.0 | 25.86 | 26.11 | 28.15 | 34.9 | 47.6 | 60.3 | 73.0 | 85.7 |
| 1" 1/8-12 | 2.117 | 29.2 | 29.03 | 29.29 | 31.33 | 38.1 | 52.4 | 66.7 | 81.0 | 95.3 |
| 1" 1/4-12 | 2.117 | 32.4 | 32.21 | 32.21 | 34.50 | 41.3 | 57.2 | 73.0 | 88.9 | 104.8 |
| 1" 3/8-12 | 2.117 | 35.5 | 35.38 | 35.38 | 37.68 | 44.5 | 61.9 | 79.4 | 96.8 | 114.3 |
| 1" 1/2-12 | 2.117 | 38.7 | 38.56 | 38.56 | 40.85 | 47.6 | 66.7 | 85.7 | 104.8 | 123.8 |
*All information is strictly informative