美制螺纹标准大全外螺纹External内螺纹InternalNominalSine,ThreadsperInch,andSeriesDesignation级别Class公差Allowance大径MajorDiameter中径PitchDiameter小径UNRMinorDiam.aMax(Ref.)级别Class小径MinorDiameter中径PitchDiameter大径MajorDiameterMaxbMinMindMaxhMinMinMaxMinMaxMin0-80UNF2A0.00050.05950.05630.05140.04960.04462B0.04650.05140.05190.05420.063A00.060.05680.05190.05060.04513B0.04650.05140.05190.05360.061-64UNC2A0.00060.07240.06860.06230.06030.05382B0.05610.06230.06290.06550.0733A00.0730.06920.06290.06140.05443B0.05610.06230.06290.06480.0731-72UNF2A0.00060.07240.06890.06340.06150.05592B0.0580.06350.0640.06650.0733A00.0730.06950.0640.06260.05653B0.0580.06350.0640.06590.0732-56UNC2A0.00060.08540.08130.07380.07170.06422B0.06670.07370.07440.07720.0863A00.0860.08190.07440.07280.06483B0.06670.07370.07440.07650.0862-64UNF2A0.00060.08540.08160.07530.07330.06682B0.06910.07530.07590.07860.0863A00.0860.08220.07590.07440.06743B0.06910.07530.07590.07790.0863-48UNC2A0.00070.09830.09380.08480.08250.07342B0.07640.08450.08550.08850.0993A00.0990.09450.08550.08380.07413B0.07640.08450.08550.08770.0993-56UNF2A0.00070.09830.09420.08670.08450.07712B0.07970.08650.08740.09020.0993A00.0990.09490.08740.08580.07783B0.07970.08650.08740.08950.0994-40UNC2A0.00080.11120.10610.0950.09250.08142B0.08490.09390.09580.09910.1123A00.1120.10690.09580.09390.08223B0.08490.09390.09580.09820.1124-48UNF2A0.00070.11130.10680.09780.09540.08642B0.08940.09680.09850.10160.1123A00.1120.10750.09850.09670.08713B0.08940.09680.09850.10080.1125-40UNC2A0.00080.12420.11910.1080.10540.09442B0.09790.10620.10880.11210.1253A00.1250.11990.10880.10690.09523B0.09790.10620.10880.11130.1255-44UNF2A0.00070.12430.11950.10950.1070.09722B0.10040.10790.11020.11340.1253A00.1250.12020.11020.10830.09793B0.10040.10790.11020.11260.1256-32UNC2A0.00080.13720.13120.11690.11410.12B0.1040.1140.11770.12140.1383A00.1380.1320.11770.11560.10083B0.1040.1140.11770.12040.1386-40UNF2A0.00080.13720.13210.1210.11840.10742B0.1110.1190.12180.12520.1383A00.1380.13290.12180.11980.10823B0.1110.11