美制螺纹标准大全外螺纹 ExternalNominalSine,Threadsper Inch,andSeriesDesignation0-80 UNF1-64 UNC1-72 UNF2-56 UNC2-64 UNF3-48 UNC3-56 UNF4-40 UNC4-48 UNF5-40 UNC5-44 UNF6-32 UNC6-40 UNF8-32 UNC8-36 UNF10-24 UNC10-28 UNS10-32 UNF10-36 UNS10-40 UNS10-48 UNS10-56 UNS12-24 UNC级公差别AllowaClasnces2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A2A3A2A2A2A2A2A0.000500.000600.000600.000600.000600.000700.000700.000800.000700.000800.000700.000800.000800.000900.000800.00100.0010.000900.00090.00090.00080.00070.001内螺纹 Internal小径UNR级小径Minor大径Major Diameter中径Pitch DiameterMinor别DiameteraClasDiam. MinMax(Ref.)sMin Maxb Min MindMaxh0.0595 0.05630.05140.04960.04462B0.04650.060.05680.05190.05060.04513B0.04650.07240.06860.06230.06030.05382B0.05610.0730.06920.06290.06140.05443B0.05610.07240.06890.06340.06150.05592B0.0580.0730.06950.0640.06260.05653B0.0580.08540.08130.07380.07170.06422B0.06670.0860.08190.07440.07280.06483B0.06670.08540.08160.07530.07330.06682B0.06910.0860.08220.07590.07440.06743B0.06910.09830.09380.08480.08250.07342B0.07640.0990.09450.08550.08380.07413B0.07640.09830.09420.08670.08450.07712B0.07970.0990.09490.08740.08580.07783B0.07970.11120.10610.0950.09250.08142B0.08490.1120.10690.09580.09390.08223B0.08490.11130.10680.09780.09540.08642B0.08940.1120.10750.09850.09670.08713B0.08940.12420.11910.1080.10540.09442B0.09790.1250.11990.10880.10690.09523B0.09790.12430.11950.10950.1070.09722B0.10040.1250.12020.11020.10830.09793B0.10040.13720.13120.11690.11410.12B0.1040.1380.1320.11770.11560.10083B0.1040.13720.13210.1210.11840.10742B0.1110.1380.13290.12180.11980.10823B0.1110.16310.15710.14280.13990.12592B0.130.1640.1580.14370.14150.12683B0.130.16320.15770.14520.14240.13012B0.1340.1640.15850.1460.14390.13093B0.1340.1890.18180.16190.15860.13942B0.1450.190.18280.16290.16040.14043B0.1450.1890.18250.16580.16250.14642B0.1510.18910.18310.16880.16580.15192B0.1560.190.1840.16970.16740.15283B0.1560.18910.18360.17110.16810.1562B0.160.18910.1840.17290.170.15922B0.1630.18920.18470.17570.17310.16442B0.1670.18930.18520.17770.17520.16812B0.1710.2150.20780.18790.18450.16542B0.171第 1 页，共 6 页2013-12-4外螺纹 ExternalNominal级Sine,Threads别公差per Inch,andClasAllowanceSeriessDesignation3A012-28 UNF2A0.0013A012-32 UNEF2A0.00093A012-36 UNS2A0.000912-40 UNS2A0.000912-48 UNS2A0.000812-56 UNS2A0.00071A0.00111/4-20 UNC2A0.00113A01/4-24 UNS2A0.00111/4-27 UNS2A0.0011A0.0011/4-28 UNF2A0.0013A01/4-32 UNEF2A0.0013A01/4-36 UNS2A0.00091/4-40 UNS2A0.00091/4-48 UNS2A0.00081/4-56 UNS2A0.00081A0.00125/16-18 UNC2A0.00123A05/16-20 UN2A0.00123A01A0.00115/16-24 UNF2A0.00113A05/16-27 UNS2A0.0015/16-28 UN2A0.0013A05/16-32 UNEF2A0.0013A05/16-36 UNS2A0.00095/16-40 UNS2A0.00095/16-48 UNS2A0.00081A0.00133/8-16 UNC2A0.0013大径Major DiameterMaxb0.2160.2150.2160.21510.2160.21510.21510.21520.21530.24890.24890.250.24890.2490.2490.2490.250.2490.250.24910.24910.24920.24920.31130.31130.31250.31130.31250.31140.31140.31250.31150.31150.31250.31150.31250.31160.31160.31170.37370.3737 Min Mind0.20880.20850.20950.20910.210.20960.210.21070.21120.23670.24080.2370.24190.24170.24230.23920.24250.24350.2430.2440.24360.2440.24470.24510.29820.30260.2980.30380.30320.30440.30060.30420.30530.30480.3050.3060.30550.30650.30610.30650.30720.35950.36430.36内螺纹 Internal小径UNR级中径Pitch DiameterMinor别Diam.aClas MinMax(Ref.)sMaxh0.18890.18630.16643B0.19180.18860.17242B0.19280.19040.17343B0.19480.19170.17792B0.19570.19330.17883B0.19710.19410.18212B0.19890.1960.18352B0.20170.19910.19042B0.20370.20120.19412B0.21640.21080.18941B0.21640.21270.18942B0.21750.21470.19053B0.22180.21810.19932B0.22490.22140.20492B0.22580.22080.20641B0.22580.22250.20642B0.22680.22430.20743B0.22870.22550.21182B0.22970.22730.21283B0.23110.2280.21612B0.23290.230.21932B0.23570.2330.22432B0.23760.2350.2282B0.27520.26910.24521B0.27520.27120.24522B0.27640.27340.24643B0.27880.27480.25182B0.280.2770.2533B0.28430.27880.26181B0.28430.28060.26182B0.28540.28270.26293B0.28740.28390.26742B0.28830.28490.26892B0.28930.28670.26993B0.29120.2880.27432B0.29220.28980.27533B0.29360.29050.27852B0.29540.29250.28182B0.29820.29550.28692B0.33310.32660.29921B0.33310.32870.29922B小径MinorDiameterMin 0.1710.1770.1770.1820.1820.1860.1890.1930.1970.1960.1960.1960.2050.210.2110.2110.2110.2160.2160.220.2230.2270.2310.2520.2520.2520.2580.2580.2670.2670.2670.2720.2740.2740.2790.2790.2820.2850.290.3070.307第 2 页，共 6 页2013-12-4
外螺纹 ExternalNominal级Sine,Threads别公差per Inch,andClasAllowanceSeriessDesignation3A03/8-18 UNS2A0.00133/8-20 UN2A0.00123A01A0.00113/8-24 UNF2A0.00113A03/8-27 UNS2A0.00113/8-28 UN2A0.00113A03/8-32 UNEF2A0.0013A03/8-36 UNS2A0.0013/8-40UNS2A0.00090.390-27 UNS2A0.00111A0.00147/16-14 UNC2A0.00143A07/16-16 UN2A0.00143A07/16-18 UNS2A0.00131A0.00137/16-20 UNF2A0.00133A07/16-24 UNS2A0.00117/16-27 UNS2A0.00117/16-28 UNEF2A0.00113A07/16-32 UN2A0.0013A01/2-12 UNS2A0.00163A01A0.00151/2 UNC2A0.00153A01/2-14 UNS2A0.0015内螺纹 Internal小径MinorDiameterMin 0.3070.3150.3210.3210.330.330.330.3350.3360.3360.3410.3410.3450.3480.350.360.360.360.370.370.3770.3830.3830.3830.3920.3970.3990.3990.4040.4040.410.410.4170.4170.4170.423小径UNR级大径Major Diameter中径Pitch DiameterMinor别Diam.aClas MinMax(Ref.)sMaxb Min MindMaxh0.3750.36560.33440.33110.30053B0.37370.3650.33760.33330.30762B0.37380.36570.34130.33720.31432B0.3750.36690.34250.33940.31553B0.37390.36310.34680.34110.32431B0.37390.36670.34680.3430.32432B0.3750.36780.34790.3450.32543B0.37390.36720.34980.34620.32982B0.37390.36740.35070.34710.33132B0.3750.36850.35180.34910.33243B0.3740.3680.35370.35030.33682B0.3750.3690.35470.35220.33783B0.3740.36850.3560.35280.34092B0.37410.3690.35790.35480.34432B0.38890.38220.36480.36120.34482B0.43610.42060.38970.38260.35111B0.43610.42580.4210.38970.3850.35112B0.43750.42720.39110.38760.35253B0.43610.42670.39550.39090.36162B0.43750.42810.39690.39350.3633B0.43620.42750.40010.39580.37012B0.43620.4240.40370.39750.37671B0.43620.42810.40370.39950.37672B0.43750.42940.4050.40190.3783B0.43640.42920.40930.40550.38682B0.43640.42970.41230.40870.39232B0.43640.42990.41320.40960.39382B0.43750.4310.41430.41160.39493B0.43650.43050.41620.41280.39932B0.43750.43150.41720.41470.40033B0.49840.4870.44430.43890.39922B0.50.48860.44590.44190.40083B0.49850.48220.44850.44110.40691B0.49850.48760.4820.44850.44350.40692B0.50.48910.450.44630.40843B0.49850.48820.45210.44710.41352B第 3 页，共 6 页2013-12-4
Internal径MinorDiameter25.4
Max0.05140.05140.06230.06230.06350.06350.07370.07370.07530.07530.08450.08450.08650.08650.09390.09390.09680.09680.10620.10620.10790.10790.1140.1140.1190.11860.1390.13890.1420.14160.1560.15550.160.1640.16410.1660.1690.1720.1750.181第 4 页，共 6 页2013-12-4
Internal径MinorDiameter25.4
Max0.18070.1860.18570.190.18950.1920.1950.1980.2010.2070.2070.20670.2150.2190.220.220.2190.2240.22290.2260.2290.2320.2350.2650.2650.2630.270.2680.2770.2770.27540.2810.2820.28070.2860.28470.2890.2910.2950.3210.321第 5 页，共 6 页
2013-12-4
Internal径MinorDiameter25.4
Max0.31820.3280.3320.32970.340.340.33720.3440.3450.34260.3490.34690.3520.3540.3590.3760.3760.37170.3840.380.390.3950.3950.39160.4020.4060.4070.40510.4110.40940.4280.42230.4340.4340.42840.438第 6 页，共 6 页2013-12-4