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Inside Diameter | Inside Circumference | Sizes | |||||||
MM | Inches | MM | Inches | British & Australian | US & Canada | French | German | Japanese | Swiss |
12.37 | 0.487 | 38.86 | 1.53 | B | 1 | - | - | 1 | - |
12.78 | 0.503 | 40.15 | 1.58 | C | 1 1/2 | - | - | - | - |
13.21 | 0.520 | 41.50 | 1.63 | D | 2 | 41 1/2 | 13 1/2 | 2 | 1 1/2 |
13.61 | 0.536 | 42.76 | 1.68 | E | 2 1/2 | 42 3/4 | 13 3/4 | 3 | 2 3/4 |
14.05 | 0.553 | 44.14 | 1.74 | F | 3 | 44 | 14 | 4 | 4 |
14.45 | 0.569 | 45.40 | 1.79 | G 1/4 | 3 1/2 | - | 14 1/2 | - | - |
14.86 | 0.585 | 46.68 | 1.84 | H 1/2 | 4 | - | 15 | 7 | - |
15.27 | 0.601 | 47.97 | 1.89 | I 1/2 | 4 1/2 | - | 15 1/4 | 8 | - |
15.70 | 0.618 | 49.32 | 1.94 | J 1/2 | 5 | - | 15 3/4 | 9 | - |
16.10 | 0.634 | 50.58 | 1.99 | L | 5 1/2 | 51 3/4 | 16 | - | 11 3/4 |
16.51 | 0.650 | 51.87 | 2.04 | M | 6 | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
16.92 | 0.666 | 53.16 | 2.09 | N | 6 1/2 | 54 | 17 | 13 | 14 |
17.35 | 0.683 | 54.51 | 2.15 | O | 7 | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
17.75 | 0.699 | 55.76 | 2.20 | P | 7 1/2 | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
18.19 | 0.716 | 57.15 | 2.25 | Q | 8 | 57 3/4 | 18 | 16 | 17 3/4 |
18.53 | 0.729 | 58.21 | 2.29 | Q 3/4 | 8 1/2 | - | 18 1/2 | 17 | - |
18.89 | 0.748 | 59.34 | 2.35 | R 3/4 | 9 | - | 19 | 18 | - |
19.22 | 0.757 | 60.38 | 2.38 | S 1/4 | 9 1/4 | - | - | - | - |
19.41 | 0.764 | 60.98 | 2.40 | S 3/4 | 9 1/2 | - | 19 1/2 | 19 | - |
19.84 | 0.781 | 62.33 | 2.45 | T 1/2 | 10 | - | 20 | 20 | - |
20.20 | 0.797 | 63.46 | 2.50 | U 1/2 | 10 1/2 | - | 20 1/4 | 22 | - |
20.68 | 0.814 | 64.97 | 2.56 | V 1/2 | 11 | - | 20 3/4 | 23 | - |
21.08 | 0.830 | 66.22 | 2.61 | W 3/4 | 11 1/2 | - | 21 | 24 | - |
21.49 | 0.846 | 67.51 | 2.66 | Y | 12 | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
21.89 | 0.862 | 68.77 | 2.71 | Z | 12 1/2 | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
22.33 | 0.879 | 70.15 | 2.76 | Z+1 | 13 | - | 22 | 27 | - |
22.60 | 0.890 | 71.00 | 2.80 | Z+1.5 | 13 1/2 | - | - | - | - |