| U.S/Canada Size |
Diameter in Inches |
Diameter in MM |
Metric MM Equivalent |
British | French | German | Japanese | Swiss |
|---|
| 2 3/4 | - | 13.83 | 43.4 | E 1/2 | - | - | ||
| 3 | 0.553 | 14.05 | 44 | F | 44 | 14 | 4 | 4 |
| 3 1/8 | - | 14.15 | 44.3 | F 1/2 | - | - | ||
| 3 1/4 | - | 14.25 | 44.6 | - | - | - | ||
| 3 3/8 | - | 14.36 | 44.9 | G | 45 1/4 | - | 5 | 5 1/4 |
| 3 1/2 | 0.569 | 14.45 | 45.2 | - | - | 14 1/2 | ||
| 3 5/8 | - | 14.56 | 45.6 | G 1/2 | - | 6 | ||
| 3 3/4 | - | 14.65 | 45.9 | H | 46 1/2 | 6 1/2 | ||
| 4 | 0.585 | 14.86 | 46.5 | H 1/2 | - | 15 | 7 | |
| 4 1/4 | - | 15.04 | 47.1 | I | 47 3/4 | 7 3/4 | ||
| 4 1/2 | 0.601 | 15.27 | 47.8 | I 1/2 | - | 15 1/4 | 8 | |
| 4 5/8 | - | 15.4 | 48.1 | J | 49 | 15 1/2 | 9 | |
| 4 3/4 | - | 15.53 | 48.4 | - | - | |||
| 5 | 0.618 | 15.7 | 49 | J 1/2 | - | 15 3/4 | 9 | |
| 5 1/8 | - | 15.8 | 49.3 | K | 50 | 10 | ||
| 5 1/4 | - | 15.9 | 49.6 | - | - | |||
| 5 3/8 | - | 16 | 50 | K 1/2 | - | 10 | ||
| 5 1/2 | 0.634 | 16.1 | 50.3 | L | 51 3/4 | 16 | 11 3/4 | |
| 5 3/4 | - | 16.3 | 50.9 | - | - | |||
| 5 7/8 | - | 16.41 | 51.3 | L 1/2 | - | |||
| 6 | 0.65 | 16.51 | 51.5 | M | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
| 6 1/4 | - | 16.71 | 52.2 | M 1/2 | - | |||
| 6 1/2 | 0.666 | 16.92 | 52.8 | N | 54 | 17 | 13 | 14 |
| 6 3/4 | - | 17.13 | 53.4 | N 1/2 | - | |||
| 7 | 0.683 | 17.35 | 54 | O | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| 7 1/4 | - | 17.45 | 54.7 | O 1/2 | - | |||
| 7 1/2 | 0.699 | 17.75 | 55.3 | P | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
| 7 3/4 | - | 17.97 | 55.9 | P 1/2 | - | |||
| 8 | 0.716 | 18.19 | 56.6 | Q | 57 3/4 | 18 | 16 | 17 3/4 |
| 8 1/4 | - | 18.35 | 57.2 | Q 1/2 | - | |||
| 8 1/2 | 0.732 | 18.53 | 57.8 | - | - | 18 1/2 | 17 | |
| 8 5/8 | - | 18.61 | 58.4 | R | 59 | 19 | ||
| 8 3/4 | - | 18.69 | 58.4 | - | - | |||
| 8 7/8 | - | 18.8 | 59 | R 1/2 | - | |||
| 9 | 0.748 | 18.89 | 59.1 | - | - | 19 | 18 | |
| 9 1/8 | - | 19.1 | 59.4 | S | 60 1/4 | 20 1/4 | ||
| 9 1/4 | - | 19.22 | 59.7 | - | - | |||
| 9 3/8 | - | 19.31 | 60 | S 1/2 | - | |||
| 9 1/2 | 0.764 | 19.41 | 60.3 | - | - | 19 1/2 | 19 | |
| 9 5/8 | - | 19.51 | 60.6 | T | 61 1/2 | 21 1/2 | ||
| 9 3/4 | - | 19.62 | 60.9 | - | - | |||
| 10 | 0.781 | 19.84 | 61.6 | T 1/2 | - | 20 | 20 | |
| 10 1/4 | - | 20.02 | 62.2 | U | 62 3/4 | 21 | 22 3/4 | |
| 10 1/2 | 0.797 | 20.2 | 62.8 | U 1/2 | - | 20 1/4 | 22 | |
| 10 5/8 | - | 20.32 | 63.1 | V | 63 | 23 3/4 | ||
| 10 3/4 | - | 20.44 | 63.5 | - | - | |||
| 11 | 0.814 | 20.68 | 64.1 | V 1/2 | - | 20 3/4 | 23 | |
| 11 1/8 | - | 20.76 | 64.3 | W | 65 | 25 | ||
| 11 1/4 | - | 20.85 | 64.7 | - | - | |||
| 11 3/8 | - | 20.94 | 65 | W 1/2 | - | |||
| 11 1/2 | - | 21.08 | 65.3 | - | - | 21 | 24 | |
| 11 5/8 | 0.83 | 21.18 | 65.7 | X | 66 1/4 | 26 1/4 | ||
| 11 3/4 | - | 21.24 | 66 | - | - | |||
| 11 7/8 | - | 21.3 | 66.3 | X 1/2 | - | |||
| 12 | 0.846 | 21.49 | 66.6 | Y | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
| 12 1/4 | - | 21.69 | 67.2 | Y 1/2 | - | |||
| 12 1/2 | 0.862 | 21.89 | 67.9 | Z | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
| 12 3/4 | - | 22.1 | 68.5 | Z 1/2 | - |