Tabella Filettatura NPT
| d | p | min | max | |
|---|---|---|---|---|
| 1/16 | 27 | 6.3 | 6.41 | 6.5 |
| 1/8 | 27 | 8.5 | 8.76 | 8.85 |
| 1/4 | 18 | 11.2 | 11.39 | 11.48 |
| 3/8 | 18 | 14.5 | 14.83 | 14.92 |
| 1/2 | 14 | 18 | 18.33 | 18.41 |
| 3/4 | 14 | 23 | 23.67 | 23.76 |
| 1′ | 11 1/2 | 29 | 29.72 | 29.81 |
| 1’1/4 | 11 1/2 | 38 | 38.48 | 38.56 |
| 1’1/2 | 11 1/2 | 44 | 44.55 | 44.63 |
| 2′ | 11 1/2 | 56 | 56.59 | 56.67 |