Size (mm) | Diameter (mm) | Australian Size | British Size | French Size | German Size | Italian Size | Asia Size | Swiss Size | USA/CAN Size |
---|---|---|---|---|---|---|---|---|---|
48 | 15.27 | I 1/2 | I 1/2 | 15.25 | 8 | 8 | 4 1/2 | ||
49 | 15.7 | J 1/2 | J 1/2 | 15.75 | 9.5 | 9 | 5 | ||
51 | 16.1 | L | L | 51 3/4 | 16 | 10.5 | 11 | 11.75 | 5 1/2 |
52 | 16.51 | M | M | 52 3/4 | 16.5 | 11.5 | 12 | 12.75 | 6 |
53 | 16.92 | N | N | 54 | 17 | 13 | 13 | 14 | 6 1/2 |
55 | 17.35 | O | O | 55 1/4 | 17.25 | 14.5 | 14 | 15.25 | 7 |
56 | 17.75 | P | P | 56 1/2 | 17.75 | 16 | 15 | 16.5 | 7 1/2 |
57 | 18.9 | Q | Q | 57 3/4 | 18 | 17 | 16 | 17.75 | 8 |
58 | 18.53 | Q 1/2 | Q 1/2 | 58 | 18.5 | 18.5 | 17 | 8 1/2 | |
59 | 18.89 | R 1/2 | R 1/2 | 59 1/4 | 19 | 19.5 | 18 | 9 | |
61 | 19.41 | S 1/2 | S 1/2 | 60 1/2 | 19.5 | 21 | 19 | 9 1/2 | |
62 | 19.84 | T 1/2 | T 1/2 | 61 3/4 | 20 | 22 | 20 | 10 | |
63 | 20.20 | U 1/2 | U 1/2 | 62 3/4 | 20.25 | 23.5 | 22 | 10 1/2 | |
65 | 20.68 | V 1/2 | V 1/2 | 64 1/4 | 20.75 | 25 | 23 | 11 | |
66 | 21.08 | W 1/2 | W 1/2 | 66 | 21 | 26.5 | 24 | 11 1/2 | |
68 | 21.49 | Y | Y | 67 1/2 | 21.25 | 27.5 | 25 | 27.5 | 12 |
69 | 21.89 | Z | Z | 68 3/4 | 21.75 | 28.5 | 26 | 28.75 | 12 1/2 |
70 | 22.33 | 22 | 30 | 27 | 13 |