Size Chart

ISO / EU Circum. Diameter US UK IT East Asia
40 40.0mm (1.57") 12.7mm (0.50") 1 ¼ C 0 1
41 41.0mm (1.61") 13.1mm (0.51") 1 ¾ D 1 1
42 42.0mm (1.65") 13.4mm (0.53") 2 ¼ D 1/2 2 2
43 43.0mm (1.69") 13.7mm (0.54") 2 ½ E 1/2 3 3
44 44.0mm (1.73") 14.0mm (0.55") 3 F 4 4
45 45.0mm (1.77") 14.3mm (0.56") 3 ¼ G 5 5
46 46.0mm (1.81") 14.6mm (0.58") 3 ¾ H 6 6
47 47.0mm (1.85") 15.0mm (0.59") 4 H 1/2 7 7
48 48.0mm (1.89") 15.3mm (0.60") 4 ½ I 1/2 8 8
49 49.0mm (1.93") 15.6mm (0.61") 5 J 9 9
50 50.0mm (1.97") 15.9mm (0.63") 5 ¼ K 10 10
51 51.0mm (2.01") 16.2mm (0.64") 5 ¾ L 11 11
52 52.0mm (2.05") 16.6mm (0.65") 6 L 1/2 12 12
53 53.0mm (2.09") 16.9mm (0.66") 6 ½ M 1/2 13 13
54 54.0mm (2.13") 17.2mm (0.68") 6 ¾ N 14 14
55 55.0mm (2.17") 17.5mm (0.69") 7 ¼ O 15 15
56 56.0mm (2.20") 17.8mm (0.70") 7 ¾ P 16 15
57 57.0mm (2.24") 18.1mm (0.71") 8 P 1/2 17 16
58 58.0mm (2.28") 18.5mm (0.73") 8 ½ Q 1/2 18 17
59 59.0mm (2.32") 18.8mm (0.74") 8 ¾ R 19 18
60 60.0mm (2.36") 19.1mm (0.75") 9 ¼ S 20 19
61 61.0mm (2.40") 19.4mm (0.76") 9 ½ T 21 20
62 62.0mm (2.44") 19.7mm (0.78") 10 T 1/2 22 21
63 63.0mm (2.48") 20.1mm (0.79") 10 ½ U 1/2 23 22
64 64.0mm (2.52") 20.4mm (0.80") 10 ¾ V 24 23
65 65.0mm (2.56") 20.7mm (0.81") 11 ¼ W 25 24
66 66.0mm (2.60") 21.0mm (0.83") 11 ½ X 26 25
67 67.0mm (2.64") 21.3mm (0.84") 12 X 1/2 27 26
68 68.0mm (2.68") 21.6mm (0.85") 12 ¼ Y 1/2 28 27
69 69.0mm (2.72") 22.0mm (0.86") 12 ¾ Z 29 28
70 70.0mm (2.76") 22.3mm (0.88") 13 ¼ Z1 30 29
71 71.0mm (2.80") 22.6mm (0.89") 13 ½ Z2 31 30
72 72.0mm (2.83") 22.9mm (0.90") 14 Z2 1/2 32 31
73 73.0mm (2.87") 23.2mm (0.91") 14 ¼ Z3 1/2 33 32
74 74.0mm (2.91") 23.6mm (0.93") 14 ¾ Z4 34 33
75 75.0mm (2.95") 23.9mm (0.94") 15 Z4 35 34