Table of Comparative Ring-Size Equivalents

Canada Standard including United StatesAverage Diameter in InchesBritish EquivalentFrench EquivalentGerman EquivalentJapanese EquivalentSwiss Equivalent
0000.39
000.422
00.454
1/2A
3/4A – 1/2
10.487B1
1 1/4B – 1/2
1 1/20.503C
1 3/4C – 1/2
20.52D41 1/213 1/421 1/2
2 1/4D – 1/2
2 1/20.536E42 3/413 3/432 3/4
2 3/4E – 1/2
30.553F441444
3 1/8F – 1/2
3 3/8G45 1/455 1/4
3 1/20.56914 1/2
3 5/8G – 1/26
3 3/4H46 1/26 1/2
40.585H – 1/2157
4 1/4I47 3/47 3/4
4 1/20.601I – 1/215 1/48
4 7/8J499
50.618J – 1/215 3/49
5 1/8K5010
5 3/8K – 1/210
5 1/20.634L51 3/41611 3/4
5 7/8L – 1/211
60.65M52 3/416 1/21212 3/4
6 1/4M – 1/2
6 1/20.666N54171314
6 3/4N – 1/2
70.683O55 1/417 1/41415 1/4
7 1/4O – 1/2
7 1/20.699P56 1/217 3/41516 1/2
7 3/4P – 1/2
80.716Q57 3/4181617 3/4
8 1/4Q -1/2
8 1/20.73218 1/217
8 5/8R5919
8 7/8R – 1/2
90.7481918
9 1/8S60 1/420 1/4
9 3/8S – 1/2
9 1/20.76419 1/219
9 5/8T61 1/221 1/2
100.781T – 1/22020
10 1/4U62 3/42122 3/4
10 1/20.797U – 1/220 1/422
10 5/8V63 3/423 3/4
110.814V – 1/220 3/423
11 1/8W6525
11 3/8W – 1/2
11 1/20.832124
11 5/8X66 1/426 1/4
11 7/8X – 1/2
120.846Y67 1/221 1/42527 1/2
12 1/4Y – 1/2
12 1/20.862Z68 3/421 3/42628 3/4
12 3/4Z – 1/2
130.8792227
Close Menu
×

Cart