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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-螺纹牙距表自攻螺钉牙距表7英制螺纹－惠氏螺纹牙数表公称牙距公称AB牙A牙公称直径尺寸牙距＝每英寸牙数ST1.50.54#2424无号数英寸in毫米mm粗牙BSW细牙BSFST1.90.65#20203/32"0.09382.38148-ST2.20.86#20181/8"0.1253.17540-ST2.60.97#19165/32"0.15633.96932-ST2.91.18#18153/16"0.18754.7632432ST3.31.310#16121/4"0.256.352026ST3.51.312#14115/16"0.31257.9381822ST3.91.414#14103/8"0.3759.5251620ST4.21.4日本墙板钉7/16"0.437511.1131418ST4.81.6公称粗牙细牙1/2"0.512.71216ST5.51.86#9185/8"0.62515.8751114ST6.31.87#9163/4"0.7519.051012ST8.02.18#9157/8"0.87522.225911ST9.52.110#8121"125.48101-1/8"1.12528.575791-1/4"1.2531.75791-1/2"1.538.1681-3/4"1.7544.45572"250.84.57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、美制或英制是以每1英寸单位内，包含的牙的个数来标识; 3、对统一标准螺纹，直径小于1/4英寸的，以号数来标识。
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