Tabella Filettatura NPTF
| d | p | min | max | |
|---|---|---|---|---|
| 1/16 | 27 | 6.3 | 6 | 6.41 |
| 1/8 | 27 | 8.6 | 8.25 | 8.76 |
| 1/4 | 18 | 11.2 | 10.7 | 11.4 |
| 3/8 | 18 | 14.75 | 14.1 | 14.84 |
| 1/2 | 14 | 18 | 17.4 | 18.33 |
| 3/4 | 14 | 23.5 | 22.6 | 23.68 |
| 1′ | 11 1/2 | 29.5 | 28.5 | 29.72 |
| 1’1/4 | 11 1/2 | 38.5 | 37 | 38.48 |
| 1’1/2 | 11 1/2 | 44 | 43.5 | 44.56 |
| 2′ | 11 1/2 | 56.5 | 55 | 56.59 |