规格 (mm) 6 7 8 9 10 12 14 16 18 20 22 25 28 32 36 40 公称外径 mm 4 5 6 7 8 9 10 11 219.1 21.22 26.4 31.53 273.1 26.54 33.06 39.52 45.93 323.9 31.55 39.32 47.04 54.7 62.32 69.89 355.6 34.68 43.22 51.73 60.18 68.57 76.92 406.4 49.49 59.24 68.94 78.6 88.2 97.75 426 51.91 62.14 72.33 82.46 92.55 102.59 457 55.73 66.73 77.68 88.58 99.43 110.23 120.98 478 58.32 69.84 81.3 92.72 104.09 115.41 126.68 508 74.28