UN螺纹尺寸表

External Thread（外螺纹） /Internal Thread（内Nominal Size（名义尺寸）,TPI, Series（系列）外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹0-80 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 UNS10-32UNF10-36 UNS10-40 UNS10-48 UNSMaxa Major最大外径Class（等级）Allowance（允许偏差）0.00050.00060.00060.00060.00060.00070.00070.00080.00070.00080.00070.00080.00080.00090.00080.0010.0010.00090.00090.00090.0008Max Minor最大小径0.05950.05140.07240.06230.07240.06350.08540.07370.08540.07530.09830.08450.09830.08650.11120.09390.11130.09680.12420.10620.12430.10790.13720.1140.13720.1190.16310.1390.16320.1420.1890.1560.1890.160.18910.1640.18910.1660.18910.1690.189225.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.42A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A

内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹10-56 UNS12-24 UNC12-28 UNF12-32 UNEF12-36 UNS12-40 UNS12-48 UNS12-56 UNS1/4-20 UNC/4-24 UNS/4-27 UNS/4-28 UNF1111/4-32 UNEF/4-36 UNS/4-40 UNS/4-48 UNS/4-56 UNS11112B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B0.00070.0010.0010.00090.00090.00090.00080.00070.00110.00110.0010.0010.0010.00090.00090.00080.00080.1720.18930.1750.2150.1810.2150.1860.21510.190.21510.1920.21510.1950.21520.1980.21530.2010.24890.2070.24890.2150.2490.2190.2490.220.2490.2240.24910.2260.24910.2290.24920.2320.24920.23525.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.4a For Class 2A threads with coating (plating) the max. is increased by the allowance, to thb For uncoated hot-rolled, but not standard fasteners with cc UN series external thread, erExternal Thread（外螺纹） /Internal Thread（内Nominal Size,TPI, Series外螺纹5Maxa MajorClassAllowance0.0012/16-18 UNC2AMax Minor0.311325.4

内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹5/16-20 UN5/16-24 UNF5/16-27 UNS/16-28 UN55/16-32 UNEF/16-36 UNS/16-40 UNS/16-48 UNS/8-16 UNC/8-18 UNS/8-20 UN5553333/8-24 UNF3/8-27 UNS/8-28 UN33/8-32 UNEF/8-36 UNS/8-40 UNS330.390?7 UNS7/16-14 UNC/16-16 UN77/16-18 UNS/16-20 UNF77/16-24 UNS2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A0.2650.00120.00110.0010.0010.0010.00090.00090.00080.00130.00130.00120.00110.00110.00110.0010.0010.00090.00110.00140.00140.00130.00130.00110.31130.270.31140.2770.31150.2810.31150.2820.31150.2860.31160.2890.31160.2910.31170.2950.37370.3210.37370.3280.37380.3320.37390.340.37390.3440.37390.3450.3740.3490.3740.3520.37410.3540.38890.3590.43610.3760.43610.3840.43620.390.43620.3950.436425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.4

内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹内螺纹外螺纹7/16-27 UNS7/16-28 UNEF7/16-32 UN1/2-12 UNS/2-13 UNC/2-14 UNS/2-16 UN1111/2-18 UNS/2-20 UNF11/2-24 UNS/2-27 UNS11/2-28 UNEF1/2-32 UN9/16-12 UNC/16-14 UNS/16-16 UN999/16-18 UNF/16-20 UN99/16-24 UNEF/16-27 UNS/16-28 UN/16-32 UN55/64-27un9992B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A2B2A0.4020.00110.00110.0010.00160.00150.001500.00130.00130.00120.00110.00110.0010.00160.00150.00140.00140.00130.00120.00110.00110.0010.43640.4060.43640.4070.43650.4110.49840.4280.49850.4340.49850.4380.49860.4460.49870.4530.49870.4570.49880.4650.49890.4690.49890.470.4990.4740.56090.490.5610.5010.56110.5090.56110.5150.56120.520.56130.5270.56140.5310.56140.5320.56150.53621.4-21.625.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.425.4

（外螺纹） /Internal Thread（内螺纹）Min Major最小外径Min Minor最小小径1.51131.305561.838961.582421.838961.61292.169161.871982.169161.912622.496822.14632.496822.19712.824482.385062.827022.458723.154682.697483.157222.740663.484882.89563.484883.02264.142743.53064.145283.60684.80063.96244.80064.0644.803144.16564.803144.21644.803144.29264.805680.05630.04650.06860.05610.06890.0580.08130.06670.08160.06910.09380.07640.09420.07970.10610.08490.10680.08940.11910.09790.11950.10040.13120.1040.13210.1110.15710.130.15770.1340.18180.1450.18250.1510.18310.1560.18360.160.1840.1630.1847MinMaxa PitchPitch最小最大中经中经0.05140.05420.06230.06550.06340.06650.07380.07720.07530.07860.08480.08850.08670.09020.0950.09910.09780.10160.1080.11210.10950.11340.11690.12140.1210.12520.14280.14750.14520.14960.16190.16720.16580.17110.16880.17360.17110.17590.17290.17750.17570.04960.05190.06030.06290.06150.0640.07170.07440.07330.07590.08250.08550.08450.08740.09250.09580.09540.09850.10540.10880.1070.11020.11410.11770.11840.12180.13990.14370.14240.1460.15860.16290.16250.16680.16580.16970.16810.1720.170.17380.1731UNRc Minor Dia外径倒角最大Major Dia(Min)孔徑倒角最小0.04460.060.05380.0730.05590.0730.06420.0860.06680.0860.07340.0990.07710.0990.08140.1120.08640.1120.09440.1250.09720.1250.10.1380.10740.1380.12590.1640.13010.1640.13940.190.14640.190.15190.190.1560.190.15920.190.1644Min b---------------------

4.36884.808224.4455.4614.59745.4614.72445.463544.8265.463544.87685.463544.9535.466085.02925.468625.10546.322065.25786.322065.4616.32465.56266.32465.5886.32465.68966.327145.74046.327145.81666.329685.89286.329685.9690.1670.18520.1710.20780.1710.20850.1770.20910.1820.20960.1860.210.1890.21070.1930.21120.1970.24080.1960.24170.2050.24230.210.24250.2110.2430.2160.24360.220.2440.2230.24470.2270.24510.231--------0.237--------0.17990.17770.18160.18790.19330.19180.1970.19480.19980.19710.20190.19890.20350.20170.20590.20370.20760.21640.22240.22180.22770.22490.23040.22580.23110.22870.23390.23110.2360.23290.23760.23570.24010.23760.24170.17650.17520.17840.18450.18890.18860.19280.19170.19570.19410.1980.1960.19980.19910.20250.20120.20440.21270.21750.21810.22290.22140.22590.22250.22680.22550.22970.2280.2320.230.23380.2330.23650.2350.23840.190.16810.190.16540.2160.17240.2160.17790.2160.18210.2160.18350.2160.19040.2160.19410.2160.18940.250.19930.250.20490.250.20640.250.21180.250.21610.250.21930.250.22430.250.2280.25 increased by the allowance, to the basic size. This is the same value as Class 3A. but not standard fasteners with cold rolled threads==（外螺纹） /Internal Thread（内螺纹）Min MajorMin Minor0.3026Basic - Allowance, for Class 1A and 2ABasic for Class 3AMinPitch0.2712UNRc Minor DiaMajor Dia(Min)0.2452Min b0.298Maxa Pitch0.27527.90702

6.7317.907026.8587.909567.03587.91217.13747.91217.16287.91217.26447.914647.34067.914647.39147.917187.4939.491988.15349.491988.33129.494528.43289.497068.6369.497068.73769.497068.7639.49968.86469.49968.94089.502148.99169.878069.118611.076949.550411.076949.753611.079489.90611.0794810.03311.084560.2520.30320.2580.30420.2670.30480.2720.3050.2740.30550.2790.30610.2820.30650.2850.30720.290.36430.3070.3650.3150.36570.3210.36670.330.36720.3350.36740.3360.3680.3410.36850.3450.3690.3480.38220.350.42580.360.42670.370.42750.3770.42810.3830.4292--------0.36---------0.421----0.28170.27880.28520.28430.29020.28740.29290.28830.29370.29120.29640.29360.29850.29540.30010.29820.30260.33310.34010.33760.34450.34130.34790.34680.35280.34980.35560.35070.35640.35370.35910.3560.36120.35790.36280.36480.37060.38970.39720.39550.40280.40010.4070.40370.41040.40930.27640.27480.280.28060.28540.28390.28840.28490.28930.2880.29220.29050.29450.29250.29630.29550.2990.32870.33440.33330.33890.33720.34250.3430.34790.34620.35090.34710.35180.35030.35470.35280.3570.35480.35880.36120.36590.3850.39110.39090.39690.39580.40140.39950.4050.40550.31250.25180.31250.26180.31250.26740.31250.26890.31250.27430.31250.27850.31250.28180.31250.28690.31250.29920.3750.30760.3750.31430.3750.32430.3750.32980.3750.33130.3750.33680.3750.34090.3750.34430.3750.34480.390.35110.43750.36160.43750.37010.43750.37670.43750.3868

10.210811.0845610.312411.0845610.337811.087110.439412.6593610.871212.661911.023612.661911.125212.6644411.328412.6669811.506212.6669811.607812.6695211.81112.6720611.912612.6720611.93812.674612.039614.2468612.44614.249412.725414.2519412.928614.2519413.08114.2544813.20814.2570213.385814.2595613.487414.2595613.512814.262113.6144#VALUE!0.3920.42970.3970.42990.3990.43050.4040.4870.410.48760.4170.48820.4230.48920.4320.490.440.49060.4460.49160.4550.49220.460.49240.4610.4930.4660.54950.4720.55070.4850.55170.4950.55240.5020.55310.5080.55410.5170.55470.5220.55490.5240.55550.52920.8-20.9----0.482--------0.544--------0.41530.41230.41810.41320.41890.41620.42160.44430.45290.44850.45650.45210.46010.4580.46550.46260.46970.46620.47310.47170.4780.47480.48070.47570.48160.47870.48420.50680.51520.51460.52260.52050.5280.5250.53230.52870.53550.53420.54050.53730.54320.53820.54410.54120.54670.41040.40870.41340.40960.41430.41280.41720.43890.44590.44350.450.44710.45360.45330.45940.45820.46390.46190.46750.46780.47290.47110.47590.4720.47680.47520.47970.50160.50840.50960.51610.51580.52190.52050.52640.52450.530.53030.53540.53360.53840.53450.53930.53770.54220.43750.39230.43750.38380.43750.39930.43750.39920.50.40690.50.41350.50.42410.50.43260.50.43920.50.44920.50.45480.50.45630.50.46180.50.46170.56250.4760.56250.48660.56250.4950.56250.50170.56250.51170.56250.51730.56250.51880.56250.52430.5625