Misura italiana | Misura iso | Diametro interno mm | Circonferenza interna mm | 6 | 46 | 14,65 | 46,0 | 7 | 47 | 14,97 | 47,0 | 8 | 48 | 15,29 | 48,0 | 9 | 49 | 15,60 | 49,0 | 10 | 50 | 15,92 | 50,0 | 11 | 51 | 16,24 | 51,0 | 12 | 52 | 16,56 | 52,0 | 13 | 53 | 16,88 | 53,0 | 14 | 54 | 17,20 | 54,0 | 15 | 55 | 17,51 | 55,0 | 16 | 56 | 17,83 | 56,0 | 17 | 57 | 18,15 | 57,0 | 18 | 58 | 18,47 | 58,0 |
| Misura italiana | Misura iso | Diametro interno mm | Circonferenza interna mm | 19 | 59 | 18,79 | 59,0 | 20 | 60 | 19,11 | 60,0 | 21 | 61 | 19,43 | 61,0 | 22 | 62 | 19,74 | 62,0 | 23 | 63 | 20,06 | 63,0 | 24 | 64 | 20,38 | 64,0 | 25 | 65 | 20,70 | 65,0 | 26 | 66 | 21,02 | 66,0 | 27 | 67 | 21,34 | 67,0 | 28 | 68 | 21,66 | 68,0 | 29 | 69 | 21,97 | 69,0 | 30 | 70 | 22,29 | 70,0 | |
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