|  |
|
|
| USA |
Diam |
Circ |
British |
French |
German |
Japanese |
Swiss |
| Size |
mm |
mm |
| 4 |
14.86 |
46.5 |
H 1/2 |
- |
15 |
7 |
- |
| 4 1/2 |
15.27 |
47.8 |
I 1/2 |
- |
15 1/4 |
8 |
- |
| 5 |
15.70 |
49.0 |
J 1/2 |
- |
15 3/4 |
9 |
- |
| 5 1/2 |
16.10 |
50.3 |
L |
51 3/4 |
16 |
- |
11 3/4 |
| 6 |
16.51 |
51.5 |
M |
52 3/4 |
16 1/2 |
12 |
12 3/4 |
| 6 1/2 |
16.92 |
52.8 |
N |
54 |
17 |
13 |
14 |
| 7 |
17.35 |
54.0 |
O |
55 1/4 |
17 1/4 |
14 |
15 1/4 |
| 7 1/2 |
17.75 |
55.3 |
P |
56 1/2 |
17 3/4 |
15 |
16 1/2 |
| 8 |
18.19 |
56.6 |
Q |
57 3/4 |
18 |
16 |
17 3/4 |
| 8 1/2 |
18.53 |
57.8 |
- |
- |
18 1/2 |
17 |
- |
| 9 |
18.89 |
59.1 |
- |
- |
19 |
18 |
- |
| 9 1/2 |
19.41 |
60.3 |
- |
- |
19 1/2 |
19 |
- |
| 10 |
19.84 |
61.6 |
T 1/2 |
- |
20 |
20 |
- |
| 10 1/2 |
20.20 |
62.8 |
U 1/2 |
- |
20 1/4 |
22 |
- |
| 11 |
20.68 |
64.1 |
V 1/2 |
- |
20 3/4 |
23 |
- |
| 11 1/2 |
21.08 |
65.3 |
- |
- |
21 |
24 |
- |
| 12 |
21.49 |
66.6 |
Y |
67 1/2 |
21 1/4 |
25 |
27 1/2 |
| 12 1/2 |
21.89 |
67.9 |
Z |
68 3/4 |
21 3/4 |
26 |
28 3/4 |
| 13 |
22.33 |
69.1 |
- |
- |
22 |
27 |
- |
|
|