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”0.256.3502028M121。751。255/16”0。31257.9381824M1421.53/8"0。3759。5251624M1621。57/16"0。437511。1131420M182.51.51/2"0。512.7001320M202.51。59/16”0。562514。2881218M222。51.55/8”0。62515.8751118M24323/4"0.7519.0501016M27327/8”0.87522.225914M303.521"125。400812(M33)3。521-1/8”1。12528。575712M36431-1/4"1。2531.750712(M39)431—3/8"1。37534.925612M424。531-1/2"1.538。100612(M45)4。531—3/4”1.7544。4505-M48532"250.8004.5-
