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Diameter(mm) | USA | British | Japanese | German | French | Swiss | Circle(mm) | Diameter (Inch) |
15.7 | 5 | J1/2 | 9 | 15.75 | 49 | 9 | 49.2 | 0.62 |
16.5 | 6 | L1/2 | 12 | 16.5 | 51.5 | 11.5 | 51.6 | 0.65 |
17.35 | 7 | O | 14 | 17.25 | 55.25 | 15.25 | 54 | 0.68 |
18.19 | 8 | Q | 16 | 18 | 57.75 | 17.75 | 56.6 | 0.72 |
18.9 | 9 | S | 18 | 19 | 59 | 19 | 60 | 0.75 |
19.84 | 10 | T1/2 | 20 | 20 | 61.5 | 21.5 | 61.6 | 0.78 |
20.6 | 11 | V1/2 | 23 | 20.75 | 64 | 24 | 64.6 | 0.82 |
21.49 | 12 | Y | 25 | 21.75 | 67.5 | 27.5 | 66.6 | 0.85 |













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