| Diameter | US & CAN | EU | UK & EU |
| 15.7mm | 5 | 49 | J1/2 |
| 15.9mm | 50 | K | |
| 16.1mm | 5.5 | K1/2 | |
| 16.3mm | 51 | L | |
| 16.5mm | 6 | 52 | L1/2 |
| 16.7mm | M | ||
| 16.9mm | 6.5 | 53 | M1/2 |
| 17.1mm | N | ||
| 17.3mm | 7 | 54 | N1/2 |
| 17.5mm | 55 | O | |
| 17.7mm | 7.5 | O1/2 | |
| 17.9mm | 56 | P | |
| 18.1mm | 8 | 57 | P1/2 |
| 18.3mm | Q | ||
| 18.5mm | 8.5 | 58 | Q1/2 |
| 18.7mm | 59 | R | |
| 18.9mm | 9 | R1/2 |
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