美制螺纹标准大全

美制螺纹标准大全外螺纹 External内螺纹 InternalNominal小径UNRSine,Threads级级别公差大径Major Diameter中径Pitch DiameterMinor别小径Minorper Inch,andClasAllowaClasDiameterSeriesDiam.asnceMaxb Min MindMaxh MinMax(Ref.)sMin Max0-80 UNFDesignation2A0.00050.0595 0.05630.05140.04960.04462B0.04650.05143A00.060.05680.05190.05060.04513B0.04650.05141-64 UNC2A0.00060.07240.06860.06230.06030.05382B0.05610.06233A00.0730.06920.06290.06140.05443B0.05610.06231-72 UNF2A0.00060.07240.06890.06340.06150.05592B0.0580.06353A00.0730.06950.0640.06260.05653B0.0580.06352-56 UNC2A0.00060.08540.08130.07380.07170.06422B0.06670.07373A00.0860.08190.07440.07280.06483B0.06670.07372-64 UNF2A0.00060.08540.08160.07530.07330.06682B0.06910.07533A00.0860.08220.07590.07440.06743B0.06910.07533-48 UNC2A0.00070.09830.09380.08480.08250.07342B0.07640.08453A00.0990.09450.08550.08380.07413B0.07640.08453-56 UNF2A0.00070.09830.09420.08670.08450.07712B0.07970.08653A00.0990.09490.08740.08580.07783B0.07970.08654-40 UNC2A0.00080.11120.10610.0950.09250.08142B0.08490.09393A00.1120.10690.09580.09390.08223B0.08490.09394-48 UNF2A0.00070.11130.10680.09780.09540.08642B0.08940.09683A00.1120.10750.09850.09670.08713B0.08940.09685-40 UNC2A0.00080.12420.11910.1080.10540.09442B0.09790.10623A00.1250.11990.10880.10690.09523B0.09790.10625-44 UNF2A0.00070.12430.11950.10950.1070.09722B0.10040.10793A00.1250.12020.11020.10830.09793B0.10040.10796-32 UNC2A0.00080.13720.13120.11690.11410.12B0.1040.1143A00.1380.1320.11770.11560.10083B0.1040.1146-40 UNF2A0.00080.13720.13210.1210.11840.10742B0.1110.1193A00.1380.13290.12180.11980.10823B0.1110.11868-32 UNC2A0.00090.16310.15710.14280.13990.12592B0.130.1393A00.1640.1580.14370.14150.12683B0.130.13898-36 UNF2A0.00080.16320.15770.14520.14240.13012B0.1340.1423A00.1640.15850.1460.14390.13093B0.1340.141610-24 UNC2A0.0010.1890.18180.16190.15860.13942B0.1450.1563A00.190.18280.16290.16040.14043B0.1450.155510-28 UNS2A0.0010.1890.18250.16580.16250.14642B0.1510.1610-32 UNF2A0.00090.18910.18310.16880.16580.15192B0.1560.1643A00.190.1840.16970.16740.15283B0.1560.164110-36 UNS2A0.00090.18910.18360.17110.16810.1562B0.160.16610-40 UNS2A0.00090.18910.1840.17290.170.15922B0.1630.16910-48 UNS2A0.00080.18920.18470.17570.17310.16442B0.1670.17210-56 UNS2A0.00070.18930.18520.17770.17520.16812B0.1710.17512-24 UNC2A0.0010.2150.20780.18790.18450.16542B0.1710.1813A00.2160.20880.18890.18630.16643B0.1710.180712-28 UNF2A0.0010.2150.20850.19180.18860.17242B0.1770.1863A00.2160.20950.19280.19040.17343B0.1770.185712-32 UNEF2A0.00090.21510.20910.19480.19170.17792B0.1820.193A00.2160.210.19570.19330.17883B0.1820.189512-36 UNS2A0.00090.21510.20960.19710.19410.18212B0.1860.19212-40 UNS2A0.00090.21510.210.19890.1960.18352B0.1890.19512-48 UNS2A0.00080.21520.21070.20170.19910.19042B0.1930.19812-56 UNS2A0.00070.21530.21120.20370.20120.19412B0.1970.2011A0.00110.24890.23670.21640.21080.18941B0.1960.2071/4-20 UNC2A0.00110.24890.24080.2370.21640.21270.18942B0.1960.207第 1 页，共 3 页

25.4

2014-12-23

外螺纹 External内螺纹 InternalNominal小径UNRSine,Threads级级别公差大径Major Diameter中径Pitch DiameterMinor别小径Minorper Inch,andClasAllowaClasDiameterSeriesDiam.asncesDesignationMaxb Min MindMaxh MinMax(Ref.)Min Max3A00.250.24190.21750.21470.19053B0.1960.20671/4-24 UNS2A0.00110.24890.24170.22180.21810.19932B0.2050.2151/4-27 UNS2A0.0010.2490.24230.22490.22140.20492B0.210.2191A0.0010.2490.23920.22580.22080.20641B0.2110.221/4-28 UNF2A0.0010.2490.24250.22580.22250.20642B0.2110.223A00.250.24350.22680.22430.20743B0.2110.2191/4-32 UNEF2A0.0010.2490.2430.22870.22550.21182B0.2160.2243A00.250.2440.22970.22730.21283B0.2160.22291/4-36 UNS2A0.00090.24910.24360.23110.2280.21612B0.220.2261/4-40 UNS2A0.00090.24910.2440.23290.230.21932B0.2230.2291/4-48 UNS2A0.00080.24920.24470.23570.2330.22432B0.2270.2321/4-56 UNS2A0.00080.24920.24510.23760.2350.2282B0.2310.2351A0.00120.31130.29820.27520.26910.24521B0.2520.2655/16-18 UNC2A0.00120.31130.30260.2980.27520.27120.24522B0.2520.2653A00.31250.30380.27640.27340.24643B0.2520.2635/16-20 UN2A0.00120.31130.30320.27880.27480.25182B0.2580.273A00.31250.30440.280.2770.2533B0.2580.2681A0.00110.31140.30060.28430.27880.26181B0.2670.2775/16-24 UNF2A0.00110.31140.30420.28430.28060.26182B0.2670.2773A00.31250.30530.28540.28270.26293B0.2670.27545/16-27 UNS2A0.0010.31150.30480.28740.28390.26742B0.2720.2815/16-28 UN2A0.0010.31150.3050.28830.28490.26892B0.2740.2823A00.31250.3060.28930.28670.26993B0.2740.28075/16-32 UNEF2A0.0010.31150.30550.29120.2880.27432B0.2790.2863A00.31250.30650.29220.28980.27533B0.2790.28475/16-36 UNS2A0.00090.31160.30610.29360.29050.27852B0.2820.2895/16-40 UNS2A0.00090.31160.30650.29540.29250.28182B0.2850.2915/16-48 UNS2A0.00080.31170.30720.29820.29550.28692B0.290.2951A0.00130.37370.35950.33310.32660.29921B0.3070.3213/8-16 UNC2A0.00130.37370.36430.360.33310.32870.29922B0.3070.3213A00.3750.36560.33440.33110.30053B0.3070.31823/8-18 UNS2A0.00130.37370.3650.33760.33330.30762B0.3150.3283/8-20 UN2A0.00120.37380.36570.34130.33720.31432B0.3210.3323A00.3750.36690.34250.33940.31553B0.3210.32971A0.00110.37390.36310.34680.34110.32431B0.330.343/8-24 UNF2A0.00110.37390.36670.34680.3430.32432B0.330.343A00.3750.36780.34790.3450.32543B0.330.33723/8-27 UNS2A0.00110.37390.36720.34980.34620.32982B0.3350.3443/8-28 UN2A0.00110.37390.36740.35070.34710.33132B0.3360.3453A00.3750.36850.35180.34910.33243B0.3360.34263/8-32 UNEF2A0.0010.3740.3680.35370.35030.33682B0.3410.3493A00.3750.3690.35470.35220.33783B0.3410.34693/8-36 UNS2A0.0010.3740.36850.3560.35280.34092B0.3450.3523/8-40UNS2A0.00090.37410.3690.35790.35480.34432B0.3480.3540.390-27 UNS2A0.00110.38890.38220.36480.36120.34482B0.350.3591A0.00140.43610.42060.38970.38260.35111B0.360.3767/16-14 UNC2A0.00140.43610.42580.4210.38970.3850.35112B0.360.3763A00.43750.42720.39110.38760.35253B0.360.37177/16-16 UN2A0.00140.43610.42670.39550.39090.36162B0.370.3843A00.43750.42810.39690.39350.3633B0.370.387/16-18 UNS2A0.00130.43620.42750.40010.39580.37012B0.3770.391A0.00130.43620.4240.40370.39750.37671B0.3830.3957/16-20 UNF2A0.00130.43620.4281第 2 页，共 3 页0.40370.39950.37672B0.3830.39525.4

2014-12-23

外螺纹 External内螺纹 InternalNominal小径UNRSine,Threads级级别公差大径Major Diameter中径Pitch DiameterMinor别小径Minorper Inch,andClasAllowaClasDiameterSeriesDiam.asncesDesignationMaxb Min MindMaxh MinMax(Ref.)Min Max3A00.43750.42940.4050.40190.3783B0.3830.39167/16-24 UNS2A0.00110.43640.42920.40930.40550.38682B0.3920.4027/16-27 UNS2A0.00110.43640.42970.41230.40870.39232B0.3970.4067/16-28 UNEF2A0.00110.43640.42990.41320.40960.39382B0.3990.4073A00.43750.4310.41430.41160.39493B0.3990.40517/16-32 UN2A0.0010.43650.43050.41620.41280.39932B0.4040.4113A00.43750.43150.41720.41470.40033B0.4040.40941/2-12 UNS2A0.00160.49840.4870.44430.43890.39922B0.410.4283A00.50.48860.44590.44190.40083B0.410.42231A0.00150.49850.48220.44850.44110.40691B0.4170.4341/2 UNC2A0.00150.49850.48760.4820.44850.44350.40692B0.4170.4343A00.50.48910.450.44630.40843B0.4170.42841/2-14 UNS2A0.00150.49850.48820.45210.44710.41352B0.4230.438第 3 页，共 3 页25.4

2014-12-23