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Inside Diameter Inside Circumference Sizes
(inches) (mm) (inches) (mm) United States & Canada United Kingdom, Ireland, Australia & New Zealand India, China & Japan Switzerland
0.459 11.6586 1.44 36.576 0
0.466 11.8364 1.46 37.084 1/4
0.474 12.0396 1.49 37.846 1/2 A
0.482 12.2428 1.51 38.354 3/4 A 1/2
0.49 12.446 1.54 39.116 1 B 1
0.498 12.6492 1.56 39.624 1 1/4 B 1/2
0.506 12.8524 1.59 40.386 1 1/2 C
0.514 13.0556 1.61 40.894 1 3/4 C 1/2
0.522 13.2588 1.64 41.656 2 D 2 1.5
0.53 13.462 1.67 42.418 2 1/4 D 1/2
0.538 13.6652 1.69 42.926 2 1/2 E 3 2.75
0.546 13.8684 1.72 43.688 2 3/4 E 1/2
0.554 14.0716 1.74 44.196 3 F 4 4
0.562 14.2748 1.77 44.958 3 1/4 F 1/2 5 5.25
0.57 14.478 1.79 45.466 3 1/2 G
0.578 14.6812 1.82 46.228 3 3/4 G 1/2 6 6.5
0.586 14.8844 1.84 46.736 4 H 7
0.594 15.0876 1.87 47.498 4 1/4 H 1/2 7.75
0.602 15.2908 1.89 48.006 4 1/2 I 8
0.61 15.494 1.92 48.768 4 3/4 J 9
0.618 15.6972 1.94 49.276 5 J 1/2 9
0.626 15.9004 1.97 50.038 5 1/4 K 10
0.634 16.1036 1.99 50.546 5 1/2 K 1/2 10
0.642 16.3068 2.02 51.308 5 3/4 L 11.75
0.65 16.51 2.04 51.816 6 L 1/2 11 12.75
0.658 16.7132 2.07 52.578 6 1/4 M 12
0.666 16.9164 2.09 53.086 6 1/2 M 1/2 13 14
0.674 17.1196 2.12 53.848 6 3/4 N
0.682 17.3228 2.14 54.356 7 N 1/2 14 15.25
0.69 17.526 2.17 55.118 7 1/4 O
0.698 17.7292 2.19 55.626 7 1/2 O 1/2 15 16.5
0.706 17.9324 2.22 56.388 7 3/4 P
0.714 18.1356 2.24 56.896 8 P 1/2 16 17.75
0.722 18.3388 2.27 57.658 8 1/4 Q
0.73 18.542 2.29 58.166 8 1/2 Q 1/2 17
0.738 18.7452 2.32 58.928 8 3/4 R 19
0.746 18.9484 2.34 59.436 9 R 1/2 18
0.754 19.1516 2.37 60.198 9 1/4 S 20.25
0.762 19.3548 2.39 60.706 9 1/2 S 1/2 19
0.77 19.558 2.42 61.468 9 3/4 T 21.5
0.778 19.7612 2.44 61.976 10 T 1/2 20
0.786 19.9644 2.47 62.738 10 1/4 U 21
0.794 20.1676 2.49 63.246 10 1/2 U 1/2 22 22.75
0.802 20.3708 2.52 64.008 10 3/4 V
0.81 20.574 2.54 64.516 11 V 1/2 23
0.818 20.7772 2.57 65.278 11 1/4 W 25
0.826 20.9804 2.59 65.786 11 1/2 W 1/2 24
0.834 21.1836 2.62 66.548 11 3/4 X
0.842 21.3868 2.65 67.31 12 X 1/2 25
0.85 21.59 2.67 67.818 12 1/4 Y
0.858 21.7932 2.7 68.58 12 1/2 Z 26 28.75
0.866 21.9964 2.72 69.088 12 3/4 Z 1/2
0.874 22.1996 2.75 69.85 13 27
0.882 22.4028 2.77 70.358 13 1/4 Z1
0.89 22.606 2.8 71.12 13 1/2
0.898 22.8092 2.82 71.628 13 3/4 Z2
0.906 23.0124 2.85 72.39 14 Z3
0.914 23.2156 2.87 72.898 14 1/4
0.922 23.4188 2.9 73.66 14 1/2 Z4
0.93 23.622 2.92 74.168 14 3/4
0.938 23.8252 2.95 74.93 15
0.946 24.0284 2.97 75.438 15 1/4
0.954 24.2316 3 76.2 15 1/2
0.962 24.4348 3.02 76.708 15 3/4
0.97 24.638 3.05 77.47 16