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Inside Diameter | Inside Circumference | Sizes | |||
MM | Inches | MM | Inches |
US & Canada (Size Used on Our Site) |
NewZeland & Australian |
15.70 | 0.618 | 49 | 1.94 | 5 | J 1/2 |
16.30 | 0.642 | 51 | 2.02 | L | |
16.51 | 0.650 | 52 | 2.04 | 6 | M |
16.92 | 0.666 | 53 | 2.09 | N | |
17.35 | 0.683 | 55 | 2.15 | 7 | O |
17.75 | 0.699 | 56 | 2.20 | P | |
18.19 | 0.716 | 57 | 2.25 | 8 | Q |
18.53 | 0.729 | 58 | 2.27 | Q 1/2 | |
18.89 | 0.748 | 59 | 2.35 | 9 | R 1/2 |
19.41 | 0.764 | 61 | 2.40 | S 1/2 | |
19.84 | 0.781 | 62 | 2.45 | 10 | T 1/2 |
20.20 | 0.797 | 63 | 2.50 | U 1/2 | |
20.68 | 0.814 | 65 | 2.56 | 11 | V 1/2 |
20.94 | 0.824 | 66 | 2.59 | W 1/2 | |
21.49 | 0.846 | 68 | 2.66 | 12 | Y |
21.89 | 0.862 | 69 | 2.71 | Z | |
22.33 | 0.879 | 70 | 2.76 | 13 | Z+1 |
22.60 | 0.890 | 71 | 2.80 | Z+1.5 | |
22.92 | 0.902 | 72 | 2.83 | 14 | Z+2 |
23.24 | 0.915 | 73 | 2.87 | Z+3 | |
23.47 | 0.924 | 74 | 2.90 | 15 | Z+4 |
23.87 | 0.940 | 75 | 2.95 | ||
24.27 | 0.956 | 76 | 3.00 | 16 | |
77 | 3.00 |