Inside Diameter | Inside Circumference | Sizes | ||||||
MM | Inches | MM | Inches | USA & Canada | British & Australian | French | German | Swiss |
11.95 | 0.474 | 37.54 | 1.49 | 1/2 | A | - | - | - |
12.18 | 0.482 | 38.26 | 1.51 | 3/4 | A 1/2 | - | - | - |
12.37 | 0.487 | 38.86 | 1.53 | 1 | B | - | - | - |
12.60 | 0.496 | 39.58 | 1.56 | 1 1/4 | B 1/2 | - | - | - |
12.78 | 0.503 | 40.15 | 1.58 | 1 1/2 | C | - | - | - |
13.00 | 0.512 | 40.84 | 1.61 | 1 3/4 | C 1/2 | - | - | - |
13.21 | 0.520 | 41.50 | 1.63 | 2 | D | 41 1/2 | 13 1/2 | 1 1/2 |
13.41 | 0.528 | 42.13 | 1.66 | 2 1/4 | D 1/2 | - | - | - |
13.61 | 0.536 | 42.76 | 1.68 | 2 1/2 | E | 42 3/4 | 13 3/4 | 2 3/4 |
13.83 | 0.544 | 43.45 | 1.71 | 2 3/4 | E 1/2 | - | - | - |
14.05 | 0.553 | 44.14 | 1.74 | 3 | F | 44 | 14 | 4 |
14.15 | 0.557 | 44.45 | 1.75 | 3 1/8 | F 1/2 | - | - | - |
14.25 | 0.561 | 44.77 | 1.76 | 3 1/4 | F 3/4 | - | - | - |
14.36 | 0.565 | 45.11 | 1.77 | 3 3/8 | G | 45 1/4 | - | 5 1/4 |
14.45 | 0.569 | 45.40 | 1.79 | 3 1/2 | G 1/4 | - | 14 1/2 | - |
14.56 | 0.573 | 45.74 | 1.80 | 3 5/8 | G 1/2 | - | - | - |
14.65 | 0.577 | 46.02 | 1.81 | 3 3/4 | H | 46 1/2 | - | 6 1/2 |
14.86 | 0.585 | 46.68 | 1.84 | 4 | H 1/2 | - | 15 | - |
15.04 | 0.592 | 47.25 | 1.86 | 4 1/4 | I | 47 3/4 | - | 7 3/4 |
15.27 | 0.601 | 47.97 | 1.89 | 4 1/2 | I 1/2 | - | 15 1/4 | - |
15.40 | 0.606 | 48.38 | 1.90 | 4 5/8 | J | 49 | 15 1/2 | 9 |
15.53 | 0.611 | 48.79 | 1.92 | 4 3/4 | J 1/4 | - | - | - |
15.70 | 0.618 | 49.32 | 1.94 | 5 | J 1/2 | - | 15 3/4 | - |
15.80 | 0.622 | 49.64 | 1.95 | 5 1/8 | K | 50 | - | 10 |
15.90 | 0.626 | 49.95 | 1.97 | 5 1/4 | K 1/4 | - | - | - |
16.00 | 0.630 | 50.27 | 1.98 | 5 3/8 | K 1/2 | - | - | - |
16.10 | 0.634 | 50.58 | 1.99 | 5 1/2 | L | 51 3/4 | 16 | 11 3/4 |
16.30 | 0.642 | 51.21 | 02.02 | 5 3/4 | L 1/4 | - | - | - |
16.41 | 0.646 | 51.55 | 02.03 | 5 7/8 | L 1/2 | - | - | - |
16.51 | 0.650 | 51.87 | 02.04 | 6 | M | 52 3/4 | 16 1/2 | 12 3/4 |
16.71 | 0.658 | 52.50 | 02.07 | 6 1/4 | M 1/2 | - | - | - |
16.92 | 0.666 | 53.16 | 02.09 | 6 1/2 | N | 54 | 17 | 14 |
17.13 | 0.674 | 53.82 | 2.12 | 6 3/4 | N 1/2 | - | - | - |
17.35 | 0.683 | 54.51 | 2.15 | 7 | O | 55 1/4 | 17 1/4 | 15 1/4 |
17.45 | 0.687 | 54.82 | 2.16 | 7 1/4 | O 1/2 | - | - | - |
17.75 | 0.699 | 55.76 | 2.20 | 7 1/2 | P | 56 1/2 | 17 3/4 | 16 1/2 |
17.97 | 0.707 | 56.45 | 2.22 | 7 3/4 | P 1/2 | - | - | - |
18.19 | 0.716 | 57.15 | 2.25 | 8 | Q | 57 3/4 | 18 | 17 3/4 |
18.35 | 0.722 | 57.65 | 2.27 | 8 1/4 | Q 1/2 | - | - | - |
18.53 | 0.729 | 58.21 | 2.29 | 8 1/2 | Q 3/4 | - | 18 1/2 | - |
18.61 | 0.733 | 58.47 | 2.30 | 8 5/8 | R | 59 | - | 19 |
18.69 | 0.736 | 58.72 | 2.31 | 8 3/4 | R 1/4 | - | - | - |
18.80 | 0.740 | 59.06 | 2.32 | 8 7/8 | R 1/2 | - | - | - |
18.89 | 0.748 | 59.34 | 2.35 | 9 | R 3/4 | - | 19 | - |
19.10 | 0.752 | 60.00 | 2.36 | 9 1/8 | S | 60 1/4 | - | 20 1/4 |
19.22 | 0.757 | 60.38 | 2.38 | 9 1/4 | S 1/4 | - | - | - |
19.31 | 0.760 | 60.66 | 2.39 | 9 3/8 | S 1/2 | - | - | - |
19.41 | 0.764 | 60.98 | 2.40 | 9 1/2 | S 3/4 | - | 19 1/2 | - |
19.51 | 0.768 | 61.29 | 2.41 | 9 5/8 | T | 61 1/2 | - | 21 1/2 |
19.62 | 0.772 | 61.64 | 2.43 | 9 3/4 | T 1/4 | - | - | - |
19.84 | 0.781 | 62.33 | 2.45 | 10 | T 1/2 | - | 20 | - |
20.02 | 0.788 | 62.89 | 2.48 | 10 1/4 | U | 62 3/4 | - | 22 3/4 |
20.20 | 0.797 | 63.46 | 2.50 | 10 1/2 | U 1/2 | - | 20 1/4 | - |
20.32 | 0.800 | 63.84 | 2.51 | 10 5/8 | V | 63 | - | 23 3/4 |
20.44 | 0.805 | 64.21 | 2.53 | 10 3/4 | V 1/4 | - | - | - |
20.68 | 0.814 | 64.97 | 2.56 | 11 | V 1/2 | - | 20 3/4 | - |
20.76 | 0.817 | 65.22 | 2.57 | 11 1/8 | W | 65 | - | 25 |
20.85 | 0.821 | 65.50 | 2.58 | 11 1/4 | W 1/4 | - | - | - |
20.94 | 0.824 | 65.78 | 2.59 | 11 3/8 | W 1/2 | - | - | - |
21.08 | 0.830 | 66.22 | 2.61 | 11 1/2 | W 3/4 | - | 21 | - |
21.18 | 0.834 | 66.54 | 2.62 | 11 5/8 | X | 66 1/4 | - | 26 1/4 |
21.24 | 0.836 | 66.73 | 2.63 | 11 3/4 | X 1/4 | - | - | - |
21.30 | 0.839 | 66.92 | 2.64 | 11 7/8 | X 1/2 | - | - | - |
21.49 | 0.846 | 67.51 | 2.66 | 12 | Y | 67 1/2 | 21 1/4 | 27 1/2 |
21.69 | 0.854 | 68.14 | 2.68 | 12 1/4 | Y 1/2 | - | - | - |
21.89 | 0.862 | 68.77 | 2.71 | 12 1/2 | Z | 68 3/4 | 21 3/4 | 29 |
22.10 | 0.870 | 69.43 | 2.73 | 12 3/4 | Z +1/2 | - | - | 29 1/2 |
22.33 | 0.879 | 70.15 | 2.76 | 13 | Z+1 | 70.0 | 22 1/4 | 30 |
22.54 | 0.887 | 70.81 | 2.788 | 13-1/4 | Z+1 1/2 | 70.5 | 22 1/2 | 31 |
22.60 | 0.890 | 71.00 | 2.80 | 13.5 | Z+2 | 71.0 | 32 | |
22.92 | 0.902 | 72.01 | 2.835 | 13-3/4 | Z+2 1/2 | 71.5 | 22 3/4 | 32 1/2 |
23.16 | 0.912 | 72.76 | 2.865 | 14 | Z+3 | 72.0 | 23 | 33 |
23.37 | 0.92 | 73.42 | 2.891 | 14-1/4 | Z+3 1/2 | 72.5 | 23 1/4 | 33 1/2 |
23.55 | 0.927 | 73.98 | 2.913 | 14-1/2 | Z+4 | 73.5 | 23 1/2 | 34 1/2 |
23.78 | 0.936 | 74.71 | 2.941 | 14-3/4 | Z+4 1/2 | 74.0 | 35 | |
24 | 0.945 | 75.4 | 2.969 | 15 | Z+5 | 74.5 | 23 3/4 | 36 |
24.19 | 0.952 | 76 | 2.992 | 15-1/4 | Z+5 1/2 | 75.0 | 24 | 36 1/2 |
24.41 | 0.961 | 76.69 | 3.019 | 15-1/2 | Z+6 | 76.0 | 24 1/4 | 37 |
24.61 | 0.969 | 77.31 | 3.044 | 15-3/4 | Z+6 1/2 | 76.5 | 24 1/2 | 37 1/2 |
24.83 | 0.978 | 78 | 3.071 | 16 | Z+7 | 77.0 | 38 1/2 |