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Inside Diameter (inches) Inside Diameter (mm) Inside Circumference (inches) Inside Circumference (mm) USA & Canada UK, AU & NZ European China & Japan
0.458 11.6 1.438 36.5        
0.466 11.8 1.463 37.2        
0.474 12 1.488 37.8   A    
0.482 12.2 1.513 38.4   A 1/2    
0.49 12.4 1.539 39.1 1 B   1
0.498 12.6 1.564 39.7 1 1/4 B 1/2    
0.506 12.9 1.589 40.4 1 1/2 C    
0.514 13.1 1.614 41 1 3/4 C 1/2    
0.522 13.3 1.639 41.6 2 D 1.5 2
0.53 13.5 1.664 42.3 2 1/4 D 1/2    
0.538 13.7 1.689 42.9 2 1/2 E 2.75 3
0.546 13.9 1.714 43.5 2 3/4 E 1/2    
0.554 14.1 1.74 44.2 3 F 4 4
0.562 14.3 1.765 44.8 3 1/4 F 1/2 5.25 5
0.57 14.5 1.79 45.5 3 1/2 G     
0.578 14.7 1.815 46.1 3 3/4 G 1/2 6.5 6
0.586 14.9 1.84 46.7 4 H     7
0.594 15.1 1.865 47.4 4 1/4 H 1/2 7.75  
0.602 15.3 1.89 48 4 1/2 I    8
0.61 15.5 1.915 48.7 4 3/4 J 9  
0.618 15.7 1.941 49.3 5 J 1/2    9
0.626 15.9 1.966 49.9 5 1/4 K 10  
0.634 16.1 1.991 50.6 5 1/2 K 1/2    10
0.642 16.3 2.016 51.2 5 3/4 L 11.75  
0.65 16.5 2.041 51.8 6 L 1/2 12.75 11
0.658 16.7 2.066 52.5 6 1/4 M 12.75 12
0.666 16.9 2.091 53.1 6 1/2 M 1/2 14 13
0.674 17.1 2.116 53.8 6 3/4 N    
0.682 17.3 2.141 54.4 7 N 1/2 15.25 14
0.69 17.5 2.167 55 7 1/4 O    
0.698 17.7 2.192 55.7 7 1/2 O 1/2 16.5 15
0.706 17.9 2.217 56.3 7 3/4 P    
0.714 18.1 2.242 56.9 8 P 1/2 17.75 16
0.722 18.3 2.267 57.6 8 1/4 Q    
0.73 18.5 2.292 58.2 8 1/2 Q 1/2   17
0.738 18.7 2.317 58.9 8 3/4 R 19  
0.746 18.9 2.342 59.5 9 R 1/2   18
0.754 19.2 2.368 60.1 9 1/4 S 20.25  
0.762 19.4 2.393 60.8 9 1/2 S 1/2   19
0.77 19.6 2.418 61.4 9 3/4 T 21.5  
0.778 19.8 2.443 62.1 10 T 1/2   20
0.786 20 2.468 62.7 10 1/4 U   21
0.794 20.2 2.493 63.3 10 1/2 U 1/2 22.75 22
0.802 20.4 2.518 64 10.3/4 V    
0.81 20.6 2.543 64.6 11 V 1/2   23
0.818 20.8 2.569 65.2 11 1/4 W 25  
0.826 21 2.594 65.9 11 1/2 W 1/2   24
0.834 21.2 2.619 66.5 11 3/4 X    
0.842 21.4 2.644 67.2 12 X 1/2 27.5 25
0.85 21.6 2.669 67.8 12 1/4 Y    
0.858 21.8 2.694 68.4 12 1/2 Z 28.75 26
0.866 22 2.719 69.1 12 3/4 Z 1/2    
0.874 22.2 2.744 69.7 13     27
0.882 22.4 2.769 70.3 13 1/4 Z1    
0.89 22.6 2.795 71 13 1/2      
0.898 22.8 2.82 71.6 13 3/4 Z2    
0.906 23 2.845 72.3 14 Z3    
0.914 23.2 2.87 72.9 14 1/4      
0.922 23.4 2.895 73.5 14 1/2 Z4    
0.93 23.6 2.92 74.2 14 3/4      
0.938 23.8 2.945 74.8 15      
0.946 24 2.97 75.4 15 1/4      
0.954 24.2 2.996 76.1 15 1/2      
0.962 24.4 3.021 76.7 15 3/4      
0.97 24.6 3.046 77.4 16