Please Note: All equivalents are approximate. | ||||||
US. & Canadian Standard |
Inside Diameter mm/inches |
Inside Circumference mm/inches |
Equivalents | |||
---|---|---|---|---|---|---|
British | French | German | Swiss | |||
1 ½ | 12.78/.503 | 40.2/1.580 | C | 40 ½ | 12¾ | — |
2 | 13.21/.520 | 41.5/1.634 | D | 41 ½ | 13¼ | 2 |
2 ½ | 13.61/.536 | 42.7/1.684 | E | 42¾ | 13¾ | 3 |
3 | 14.05/.553 | 44.0/1.739 | F | 44 | 14 | 4 |
3 ½ | 14.45/.569 | 45.2/1.788 | G | 45¼ | 14 ½ | — |
4 | 14.86/.585 | 46.5/1.836 | H ½ | 46 ½ | 15 | 7 |
4 ½ | 15.27/.601 | 47.8/1.888 | I ½ | 47¾ | 15¼ | 8 |
5 | 15.70/.618 | 49.0/1.941 | j ½ | 49 | 15¾ | 9 |
5 ½ | 16.10/.634 | 50.2/1.992 | L | 50¼ | 16 | — |
6 | 16.51/.650 | 51.5/2.042 | M | 51 ½ | 16 ½ | 12 |
6 ½ | 16.92/.666 | 52.8/2.092 | N | 52¾ | 17 | 13 |
7 | 17.35/.683 | 54.0/2.146 | N ½ | 54 | 17¼ | 14 |
7 ½ | 17.63/.699 | 55.3/2.196 | O ½ | 55 ½ | 17 ½ | 15 |
8 | 18.19/.716 | 56.6/2.249 | P ½ | 56¾ | 18 | 16 |
8 ½ | 18.59/.732 | 57.8/2.300 | Q ½ | 58 | 18 ½ | 17 |
9 | 18.99/.748 | 59.1/2.350 | R ½ | 59¼ | 19 | 18 |
9 ½ | 19.41/.764 | 60.3/2.400 | S ½ | 60 ½ | 19 ½ | 19 |
10 | 19.84/.781 | 61.6/2.463 | T ½ | 61¾ | 20 | 20 |
10 ½ | 20.24/.797 | 62.8/2.504 | U ½ | 62¾ | 20¼ | 22 |
11 | 20.68/.814 | 64.1/2.567 | V ½ | 64 ½ | 20¾ | 23 |
11 ½ | 21.01/.830 | 66.0/2.608 | W ½ | 66 | 21 | 24 |
12 | 21.41/.846 | 67.3/2.658 | Y | 67¼ | 21 ½ | 25 |