外螺纹 External
NominalSine,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 UNC
级
公差别
AllowaClas
nces2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A2A3A
0.000500.000600.000600.000600.000600.000700.000700.000800.000700.000800.000700.000800.000800.000900.000800.0010
内螺纹 Internal
小径MinorDiameterMin 0.04650.04650.05610.05610.0580.0580.06670.06670.06910.06910.07640.07640.07970.07970.08490.08490.08940.08940.09790.09790.10040.10040.1040.1040.1110.1110.130.130.1340.1340.1450.145
Max0.05140.05140.06230.06230.06350.06350.07370.07370.07530.07530.08450.08450.08650.08650.09390.09390.09680.09680.10620.10620.10790.10790.1140.1140.1190.11860.1390.13890.1420.14160.1560.1555
小径UNR级
大径Major Diameter中径Pitch DiameterMinor别
a
ClasDiam.
MinMax(Ref.)sMaxb Min MindMaxh
0.0595 0.05630.05140.04960.04462B0.060.05680.05190.05060.04513B0.07240.06860.06230.06030.05382B0.0730.06920.06290.06140.05443B0.07240.06890.06340.06150.05592B0.0730.06950.0640.06260.05653B0.08540.08130.07380.07170.06422B0.0860.08190.07440.07280.06483B0.08540.08160.07530.07330.06682B0.0860.08220.07590.07440.06743B0.09830.09380.08480.08250.07342B0.0990.09450.08550.08380.07413B0.09830.09420.08670.08450.07712B0.0990.09490.08740.08580.07783B0.11120.10610.0950.09250.08142B0.1120.10690.09580.09390.08223B0.11130.10680.09780.09540.08642B0.1120.10750.09850.09670.08713B0.12420.11910.1080.10540.09442B0.1250.11990.10880.10690.09523B0.12430.11950.10950.1070.09722B0.1250.12020.11020.10830.09793B0.13720.13120.11690.11410.12B0.1380.1320.11770.11560.10083B0.13720.13210.1210.11840.10742B0.1380.13290.12180.11980.10823B0.16310.15710.14280.13990.12592B0.1640.1580.14370.14150.12683B0.16320.15770.14520.14240.13012B0.1640.15850.1460.14390.13093B0.1890.18180.16190.15860.13942B0.190.18280.16290.16040.14043B
第 1 页，共 3 页2010-12-15
外螺纹 External
Nominal级
Sine,Threads公差
别
Allowaper Inch,and
Clas
nceSeries
s
Designation3A0
12-28 UNF2A0.001
3A0
12-32 UNEF2A0.0009
3A0
12-36 UNS2A0.000912-40 UNS2A0.000912-48 UNS2A0.000812-56 UNS2A0.0007
1A0.0011
1/4-20 UNC2A0.0011
3A0
1/4-24 UNS2A0.00111/4-27 UNS2A0.001
1A0.001
1/4-28 UNF2A0.001
3A0
1/4-32 UNEF2A0.001
3A0
1/4-36 UNS2A0.00091/4-40 UNS2A0.00091/4-48 UNS2A0.00081/4-56 UNS2A0.0008
1A0.0012
5/16-18 UNC2A0.0012
3A0
5/16-20 UN2A0.0012
3A01A0.0011
5/16-24 UNF2A0.0011
3A0
5/16-27 UNS2A0.0015/16-28 UN2A0.001
3A0
5/16-32 UNEF2A0.001
3A0
5/16-36 UNS2A0.00095/16-40 UNS2A0.00095/16-48 UNS2A0.0008
1A0.0013
3/8-16 UNC2A0.0013
3A0
内螺纹 Internal
小径UNR级
小径Minor
大径Major Diameter中径Pitch DiameterMinor别Diametera
ClasDiam.
MinMax(Ref.)sMin MaxMaxb Min MindMaxh
0.2160.20880.18890.18630.16643B0.1710.18070.2150.20850.19180.18860.17242B0.1770.1860.2160.20950.19280.19040.17343B0.1770.18570.21510.20910.19480.19170.17792B0.1820.190.2160.210.19570.19330.17883B0.1820.18950.21510.20960.19710.19410.18212B0.1860.1920.21510.210.19890.1960.18352B0.1890.1950.21520.21070.20170.19910.19042B0.1930.1980.21530.21120.20370.20120.19412B0.1970.2010.24890.23670.21640.21080.18941B0.1960.2070.24890.24080.2370.21640.21270.18942B0.1960.2070.250.24190.21750.21470.19053B0.1960.20670.24890.24170.22180.21810.19932B0.2050.2150.2490.24230.22490.22140.20492B0.210.2190.2490.23920.22580.22080.20641B0.2110.220.2490.24250.22580.22250.20642B0.2110.220.250.24350.22680.22430.20743B0.2110.2190.2490.2430.22870.22550.21182B0.2160.2240.250.2440.22970.22730.21283B0.2160.22290.24910.24360.23110.2280.21612B0.220.2260.24910.2440.23290.230.21932B0.2230.2290.24920.24470.23570.2330.22432B0.2270.2320.24920.24510.23760.2350.2282B0.2310.2350.31130.29820.27520.26910.24521B0.2520.2650.31130.30260.2980.27520.27120.24522B0.2520.2650.31250.30380.27640.27340.24643B0.2520.2630.31130.30320.27880.27480.25182B0.2580.270.31250.30440.280.2770.2533B0.2580.2680.31140.30060.28430.27880.26181B0.2670.2770.31140.30420.28430.28060.26182B0.2670.2770.31250.30530.28540.28270.26293B0.2670.27540.31150.30480.28740.28390.26742B0.2720.2810.31150.3050.28830.28490.26892B0.2740.2820.31250.3060.28930.28670.26993B0.2740.28070.31150.30550.29120.2880.27432B0.2790.2860.31250.30650.29220.28980.27533B0.2790.28470.31160.30610.29360.29050.27852B0.2820.2890.31160.30650.29540.29250.28182B0.2850.2910.31170.30720.29820.29550.28692B0.290.2950.37370.35950.33310.32660.29921B0.3070.3210.37370.36430.360.33310.32870.29922B0.3070.3210.3750.36560.33440.33110.30053B0.3070.3182
第 2 页，共 3 页2010-12-15外螺纹 External
NominalSine,Threadsper Inch,andSeriesDesignation3/8-18 UNS3/8-20 UN
级
公差别
AllowaClas
nces2A2A3A1A2A3A2A2A3A2A3A2A2A2A1A2A3A2A3A2A1A2A3A2A2A2A3A2A3A2A3A1A2A3A2A
0.00130.001200.00110.001100.00110.001100.00100.0010.00090.00110.00140.001400.001400.00130.00130.001300.00110.00110.001100.00100.001600.00150.001500.0015
内螺纹 Internal
小径MinorDiameterMin 0.3150.3210.3210.330.330.330.3350.3360.3360.3410.3410.3450.3480.350.360.360.360.370.370.3770.3830.3830.3830.3920.3970.3990.3990.4040.4040.410.410.4170.4170.4170.423
Max0.3280.3320.32970.340.340.33720.3440.3450.34260.3490.34690.3520.3540.3590.3760.3760.37170.3840.380.390.3950.3950.39160.4020.4060.4070.40510.4110.40940.4280.42230.4340.4340.42840.438
3/8-24 UNF3/8-27 UNS3/8-28 UN3/8-32 UNEF3/8-36 UNS3/8-40UNS0.390-27 UNS7/16-14 UNC7/16-16 UN7/16-18 UNS7/16-20 UNF7/16-24 UNS7/16-27 UNS7/16-28 UNEF7/16-32 UN1/2-12 UNS
1/2 UNC1/2-14 UNS
小径UNR级
大径Major Diameter中径Pitch DiameterMinor别
Diam.aClas
MinMax(Ref.)sMaxb Min MindMaxh
0.37370.3650.33760.33330.30762B0.37380.36570.34130.33720.31432B0.3750.36690.34250.33940.31553B0.37390.36310.34680.34110.32431B0.37390.36670.34680.3430.32432B0.3750.36780.34790.3450.32543B0.37390.36720.34980.34620.32982B0.37390.36740.35070.34710.33132B0.3750.36850.35180.34910.33243B0.3740.3680.35370.35030.33682B0.3750.3690.35470.35220.33783B0.3740.36850.3560.35280.34092B0.37410.3690.35790.35480.34432B0.38890.38220.36480.36120.34482B0.43610.42060.38970.38260.35111B0.43610.42580.4210.38970.3850.35112B0.43750.42720.39110.38760.35253B0.43610.42670.39550.39090.36162B0.43750.42810.39690.39350.3633B0.43620.42750.40010.39580.37012B0.43620.4240.40370.39750.37671B0.43620.42810.40370.39950.37672B0.43750.42940.4050.40190.3783B0.43640.42920.40930.40550.38682B0.43640.42970.41230.40870.39232B0.43640.42990.41320.40960.39382B0.43750.4310.41430.41160.39493B0.43650.43050.41620.41280.39932B0.43750.43150.41720.41470.40033B0.49840.4870.44430.43890.39922B0.50.48860.44590.44190.40083B0.49850.48220.44850.44110.40691B0.49850.48760.4820.44850.44350.40692B0.50.48910.450.44630.40843B0.49850.48820.45210.44710.41352B
第 3 页，共 3 页2010-12-15
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