Materiale: lega
| Diametro | |||||||||
| U.S.A. | Regno Unito | Ru | FR | CA | Br | De | circonferenza (mm) | mm | pollice |
| 5 | J1/2 | 15.7 | 49.3 | 5 | 15.7 | 15.7 | 49.3 | 15.7 | 0.62 |
| 6 | L1/2 | 16.5 | 51.9 | 6 | 16.5 | 16.5 | 51.9 | 16.5 | 0.65 |
| 7 | N1/2 (O) | 17.3 | 54.4 | 7 | 17.3 | 17.3 | 54.4 | 17.3 | 0.68 |
| 8 | P1/2 (Q) | 18.1 | 57 | 8 | 18.1 | 18.1 | 57 | 18.1 | 0.71 |
| 9 | R1/2 (s) | 18.9 | 59,5 | 9 | 18.9 | 18.9 | 59,5 | 18.9 | 0.74 |
| 10 | T1/2 | 19.8 | 62.1 | 10 | 19.8 | 19.8 | 62.1 | 19.8 | 0.78 |
| 11 | V1/2 | 20.6 | 64.6 | 11 | 20.6 | 20.6 | 64.6 | 20.6 | 0.81 |
| 12 | X1/2 | 21.4 | 67.2 | 12 | 21.4 | 21.4 | 67.2 | 21.4 | 0.84 |
