Number Of Coils In The Free State (UNF)
| Nominal Diameter | Pitch (mm) | Drill Bit Diameter (mm) | Drilling Diameter | Tap | Number Of Coils In The Free State | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| min. | max. | Min Outer Diameter | 1d | 1.5d | 2d | 2.5d | 3d | |||
| 2-64 | 0.396 | 2.3 | 2.29 | 2.44 | 2.70 | 3.5 | 5.6 | 8.0 | 10.4 | 12.5 |
| 3-56 | 0.453 | 2.7 | 2.62 | 2.77 | 3.10 | 3.4 | 5.6 | 8.0 | 10.4 | 12.6 |
| 4-48 | 0.529 | 3.0 | 2.97 | 3.14 | 3.53 | 3.4 | 5.6 | 7.9 | 10.2 | 12.5 |
| 6-40 | 0.635 | 3.8 | 3.66 | 3.81 | 4.33 | 3.8 | 6.0 | 8.4 | 10.8 | 13.2 |
| 8-36 | 0.706 | 4.4 | 4.32 | 4.47 | 5.08 | 4.0 | 6.6 | 9.1 | 11.7 | 14.2 |
| 10-32 | 0.794 | 5.1 | 5.00 | 5.16 | 5.86 | 4.1 | 6.8 | 9.5 | 12.1 | 14.9 |
| 1/4-28 | 0.907 | 6.7 | 6.55 | 6.72 | 7.53 | 5.0 | 8.1 | 11.3 | 14.4 | 17.6 |
| 5/16-24 | 1.058 | 8.3 | 8.17 | 8.35 | 9.31 | 5.5 | 8.9 | 12.2 | 15.6 | 19.0 |
| 3/8-24 | 1.058 | 9.9 | 9.75 | 9.93 | 10.90 | 6.9 | 10.9 | 14.9 | 19.0 | 23.2 |
| 7/16-20 | 1.270 | 11.5 | 11.39 | 11.59 | 12.76 | 6.6 | 10.6 | 14.5 | 18.4 | 22.5 |
| 1/2-20 | 1.270 | 13.1 | 12.97 | 13.16 | 14.35 | 7.8 | 12.3 | 16.8 | 21.3 | 25.9 |
| 9/16-18 | 1.411 | 14.7 | 14.59 | 14.79 | 16.12 | 7.9 | 12.5 | 17.1 | 21.6 | 26.2 |
| 5/8-18 | 1.411 | 16.3 | 16.18 | 16.38 | 17.71 | 8.9 | 14.1 | 19.1 | 24.3 | 29.4 |
| 3/4-16 | 1.588 | 19.5 | 19.39 | 19.60 | 21.11 | 9.7 | 15.1 | 20.6 | 26.0 | 31.5 |
| 7/8-14 | 1.814 | 22.7 | 22.62 | 22.84 | 24.58 | 9.9 | 15.4 | 21.0 | 26.6 | 32.2 |
| 1"-14 | 1.814 | 26.0 | 25.86 | 26.11 | 27.76 | 11.5 | 17.9 | 24.3 | 30.6 | 37.0 |
| 1"-12 | 2.117 | 26.0 | 25.86 | 26.11 | 28.15 | 9.7 | 15.1 | 20.6 | 26.1 | 31.5 |
| 1" 1/8-12 | 2.117 | 29.2 | 29.03 | 29.29 | 31.33 | 11.1 | 17.3 | 23.4 | 29.6 | 35.7 |
| 1" 1/4-12 | 2.117 | 32.4 | 32.21 | 32.21 | 34.50 | 12.4 | 19.3 | 26.1 | 33.0 | 39.8 |
| 1" 3/8-12 | 2.117 | 35.5 | 35.38 | 35.38 | 37.68 | 13.8 | 21.3 | 28.9 | 36.5 | 44.0 |
| 1" 1/2-12 | 2.117 | 38.7 | 38.56 | 38.56 | 40.85 | 15.2 | 23.4 | 31.6 | 39.8 | 48.2 |
*All information is strictly informative