Stock thickness
Size (mm) 2mm 1.6mm 1.3mm 1.0mm .80mm .60mm .50mm
1 0.39 45.5 44.2 43 42.1 41.5 40.9 40.5
1 1/4 39.6 46.2 44.6 43.6 42.7 42.1 41.5 41.1
1 1/2 40.2 46.9 45.2 44.3 43.3 42.7 42.1 41.8
1 3/4 40.8 47.7 45.8 44.9 44 43.3 42.7 42.4
2 41.5 48 46.5 45.5 44.6 44 43.3 43
2 1/4 42.1 48.7 47.1 46.2 45.2 44.6 44 43.6
2 1/2 42.7 49.3 47.7 46.8 45.8 45.2 44.6 44.3
2 3/4 43.3 49.9 48.4 47.4 46.5 45.8 45.2 44.9
3 44 50.6 49 48 47.1 46.5 45.8 45.6
3 1/4 44.6 51.2 49.6 48.7 47.7 47.1 46.5 46.2
3 1/2 45.2 51.8 50.2 49.3 48.4 47.7 47.1 46.8
3 3/4 45.9 52.4 50.9 49.9 49 48.4 47.7 47.4
4 46.5 53.1 51.5 50.6 49.6 49 48.3 48
4 1/4 47.1 53.7 52.1 51.2 50.2 49.6 49 48.7
4 1/2 47.8 54.3 52.8 51.8 50.9 50.2 49.6 49.3
4 3/4 48.4 55 53.4 52.4 51.5 50.9 50.2 49.9
5 49 55.6 54 53.1 52.1 51.5 50.9 50.6
5 1/4 49.6 56.2 54.6 53.7 52.8 52.1 51.5 51.2
5 1/2 50.3 56.8 55.3 54.3 53.4 52.7 52.1 51.8
5 3/4 50.9 57.5 55.9 55 54 53.4 52.8 52.4
6 51.5 58.1 56.5 55.6 54.6 54 53.4 53.1
6 1/4 52.2 58.7 57.1 56.2 55.3 54.6 54 53.7
6 1/2 52.8 59.3 57.8 56.8 55.9 55.3 54.6 54.3
6 3/4 53.4 60 58.4 57.5 56.5 55.9 55.3 55
7 54 60.6 59 58.1 57.1 56.5 55.9 55.6
7 1/4 54.7 61.2 59.7 58.7 57.8 57.1 56.5 56.2
7 1/2 55.3 61.9 60.3 59.3 58.4 57.8 57.1 56.8
7 3/4 55.9 62.5 60.9 60 59 58.4 57.8 57.5
8 56.6 63.1 61.5 60.6 59.7 59 58.4 58.1
8 1/4 57.2 63.7 62.2 61.2 60.3 59.7 59 58.7
8 1/2 57.8 64.4 62.8 61.9 60.9 60.3 59.7 59.3
8 3/4 58.4 65 63.4 62.5 61.5 60.9 60.3 60
9 59.1 65.6 64.1 63.1 62.2 61.5 60.9 60.6
9 1/4 59.7 66.3 64.7 63.7 62.8 62.2 61.5 61.2
9 1/2 60.3 66.9 65.3 64.4 63.4 62.8 62.2 61.9
9 3/4 60.9 67.5 65.9 65 64.1 63.4 62.8 62.5
10 61.6 68.1 66.6 65.6 64.7 64.1 63.4 63.1
10 1/4 62.2 68.8 67.2 66.3 65.3 64.7 64.1 63.7
10 1/2 62.8 69.4 67.8 66.9 65.9 65.3 64.7 64.4
10 3/4 63.5 70 68.5 67.5 66.6 65.9 65.3 65
11 64.1 70.7 69.1 68.1 67.2 66.6 65.9 65.6
11 1/4 64.7 71.3 69.7 68.8 67.8 67.2 66.6 66.3
11 1/2 65.3 71.9 70.3 69.4 68.5 67.8 67.2 66.9
11 3/4 66 72.5 71 70 69.1 68.5 67.8 67.5
12 66.6 73.2 71.6 70.7 69.7 69.1 68.5 68.1
12 1/4 67.2 73.8 72.2 71.3 70.3 69.7 69.1 68.8
12 1/2 67.9 74.4 72.8 71.9 71 70.3 69.7 69.4
12 3/4 68.5 75 73.5 72.5 71.6 71 70.3 70
13 69.1 75.7 74.1 73.2 72.2 71.6 71 70.7

U.S. & Inside
Canadian Diameter
Standard mm / inches
1½ 12.78 / .503
2 13.21 / .520
2½ 13.61 / .536
3 14.04 / .553
3½ 14.45 / .569
4 14.86 / .585
4½ 15.27 / .601
5 15.70 / .618
5½ 16.10 / .634
 6 16.51 / .650
 6¼ 16.71 / .657
6½ 16.92 / .666
7 17.35 / .683
7½ 17.63 / .699
8 18.19 / .716
8½ 18.59 / .732
9 18.99 / .748
9½ 19.41 / .764
10 19.84 / .781
10½ 20.24 / .797
11 20.68 / .814
11½ 21.01 / .830
12 21.41 / .846
12½ 21.8 /.858
13 22.2 / .846
13½ 22.6 / .859
14 23 / .905
14½ 23.4 / .921
15 23.9 / .940
15½ 24.3/ .956

 
Area:
Diameter:
Circumference:

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