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1、 英制螺纹规格及加工资料 55度圆柱管螺纹 （PT） 55度圆锥管螺纹 （PS）螺纹类型每寸牙数螺纹外径钻孔直径每寸牙数基面外径钻孔直径1/41913.157111913.157 11.43/81916.66214.51916.66215.01/21420.95518.01420.95518.5（5/8）1422.91122.9113/41426.44123.51426.44124.0（7/8）1430.20130.20111133.24929.51133.24930.21 -1/81137.8491137.8491- 1/4 1141.91038.01141.91038.81- 1/2114
2、7.80344.01147.80344.8（1- 3/4）1153.74653.74621159.61455.51159.61456.5（2-1/4）1165.71065.7102-1/21176.1841176.1842-3/41181.5311181.53131187.8841187.884 英制（美制）螺纹规格及加工资料 55度英制普螺纹 （BSW） 60度美制管螺纹 （NPT）螺纹类型每寸牙数螺纹外径钻孔直径每寸牙数外径钻孔直径1/16197.9 6.251/8402.652710.38.435/32323.253/16243.751/4205.101813.611.35/16186.603/8168.001814.812.17/16149.401/21210.701421.2118.329/161212.305/81113.703/41016.701426.5723.677/8919.501822.401133.2329.2