螺纹牙距表

公制螺纹牙距表美制 统一标准螺纹牙数表公称直径牙距 mm公称直径直径尺寸牙距＝每英寸牙数毫米粗牙细牙号＜ 1/4"英寸 in毫米 mm粗牙 UNC细牙 UNFM10.250.20#0.061.524-80M1.20.250.21#0.0731.8546472M1.60.350.22#0.0862.1845664M20.40.253#0.0992.5154856M2.50.450.354#0.1122.8454048M30.50.355#0.1253.1754044M40.70.56#0.1383.5053240M50.80.58#0.1644.1663236M610.7510#0.194.8262432M81.25112#0.2165.4862428M101.51.251/4"0.256.352028M121.751.255/16"0.31257.9381824M1421.53/8"0.3759.5251624M1621.57/16"0.437511.1131420M182.51.51/2"0.512.71320M202.51.59/16"0.562514.2881218M222.51.55/8"0.62515.8751118M24323/4"0.7519.051016M27327/8"0.87522.225914M303.521"125.4812(M33)3.521-1/8"1.12528.575712M36431-1/4"1.2531.75712(M39)431-3/8"1.37534.925612M424.531-1/2"1.538.1612(M45)4.531-3/4"1.7544.455-M48532"250.84.5-螺距（P）：为相邻牙在中径线上对应两点的轴向距离或相邻牙山或牙谷间的距离。   1、公制牙距直接以距离（毫米mm）标识;2、对统一标准螺纹，直径小于1/4英寸的，以号数来标识