UN螺纹尺寸表

External Thread /Internal ThreadNominalSize,TPI,Series0-80 UNF0-80 UNF1-64 UNC1-64 UNC1-72 UNF1-72 UNF2-56 UNC2-56 UNC2-64 UNF2-64 UNF3-48 UNC3-48 UNC3-56 UNF3-56 UNF4-40 UNC4-40 UNC4-48 UNF4-48 UNF5-40 UNC5-40 UNC5-44 UNFMaxaMajorClassExt.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2AAllowance0.000500.000600.000600.000600.000600.000700.000700.000800.000700.000800.0007MaxMinor0.05950.05140.060.05140.07240.06230.0730.06230.07240.06350.0730.06350.08540.07370.0860.07370.08540.07530.0860.07530.09830.08450.0990.08450.09830.08650.0990.08650.11120.09390.1120.09390.11130.09680.1120.09680.12420.10620.1250.10620.1243MinMajorMinMinor0.05630.04650.05680.04650.06860.05610.06920.05610.06890.0580.06950.0580.08130.06670.08190.06670.08160.06910.08220.06910.09380.07640.09450.07640.09420.07970.09490.07970.10610.08490.10690.08490.10680.08940.10750.08940.11910.09790.11990.09790.1195Min b---------------------MaxaPitch0.05140.05420.05190.05360.06230.06550.06290.06480.06340.06650.0640.06590.07380.07720.07440.07650.07530.07860.07590.07790.08480.08850.08550.08770.08670.09020.08740.08950.0950.09910.09580.09820.09780.10160.09850.10080.1080.11210.10880.11130.1095MinPitch0.04960.05190.05060.05190.06030.06290.06140.06290.06150.0640.06260.0640.07170.07440.07280.07440.07330.07590.07440.07590.08250.08550.08380.08550.08450.08740.08580.08740.09250.09580.09390.09580.09540.09850.09670.09850.10540.10880.10690.10880.107Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.5-44 UNF6-32 UNC6-32 UNC6-40 UNF6-40 UNF8-32 UNC8-32 UNC8-36 UNF8-36 UNF10-24 UNC10-24 UNC10-28 UNS10-32UNF10-32UNF10-36 UNS10-40 UNS10-48 UNS10-56 UNS12-24 UNC12-24 UNC12-28 UNF12-28 UNF12-32 UNEF2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B3A3B2A2B2A2B3A3B2A2B2A2B2A2B2A2B2A2B3A3B2A2B3A3B2A2B00.000800.000800.000900.000800.00100.0010.000900.00090.00090.00080.00070.00100.00100.00090.10790.1250.10790.13720.1140.1380.1140.13720.1190.1380.11860.16310.1390.1640.13890.16320.1420.1640.14160.1890.1560.190.15550.1890.160.18910.1640.190.16410.18910.1660.18910.1690.18920.1720.18930.1750.2150.1810.2160.18070.2150.1860.2160.18570.21510.190.10040.12020.10040.13120.1040.1320.1040.13210.1110.13290.1110.15710.130.1580.130.15770.1340.15850.1340.18180.1450.18280.1450.18250.1510.18310.1560.1840.1560.18360.160.1840.1630.18470.1670.18520.1710.20780.1710.20880.1710.20850.1770.20950.1770.20910.182-----------------------0.11340.11020.11260.11690.12140.11770.12040.1210.12520.12180.12430.14280.14750.14370.14650.14520.14960.1640.14870.16190.16720.16290.16610.16580.17110.16880.17360.16970.17260.17110.17590.17290.17750.17570.17990.17770.18160.18790.19330.18890.19220.19180.1970.19280.19590.19480.19980.11020.10830.11020.11410.11770.11560.11770.11840.12180.11980.12180.13990.14370.14150.14370.14240.1460.14390.1460.15860.16290.16040.16290.16250.16680.16580.16970.16740.16970.16810.1720.170.17380.17310.17650.17520.17840.18450.18890.18630.18890.18860.19280.19040.19280.19170.1957Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.12-32 UNEF12-36 UNS12-40 UNS12-48 UNS12-56 UNS1/4-20 UNC/4-20 UNC/4-20 UNC/4-24 UNS/4-27 UNS/4-28 UNF/4-28 UNF/4-28 UNF11111111/4-32 UNEF/4-32 UNEF/4-36 UNS/4-40 UNS/4-48 UNS11111Ext.0.00080.24920.2451-0.23760.235/4-56 UNSInt.0.2350.2310.24170.2384a For Class 2A threads with coating (plating) the max. is increased by the allowance, to the basic size.This is the same value as Class 3A.

3A3B2A2B2A2B2A2B2A2B1A1B2A2B3A3B2A2B2A2B1A1B2A2B3A3B2A2B3A3B2A2B2A2B2A2B2A2B00.00090.00090.00080.00070.00110.001100.00110.0010.0010.00100.00100.00090.00090.00080.2160.18950.21510.1920.21510.1950.21520.1980.21530.2010.24890.2070.24890.2070.250.20670.24890.2150.2490.2190.2490.220.2490.220.250.2190.2490.2240.250.22290.24910.2260.24910.2290.24920.2320.210.1820.20960.1860.210.1890.21070.1930.21120.1970.23670.1960.24080.1960.24190.1960.24170.2050.24230.210.23920.2110.24250.2110.24350.2110.2430.2160.2440.2160.24360.220.2440.2230.24470.227------0.2367-----------0.19570.19880.19710.20190.19890.20350.20170.20590.20370.20760.21640.22480.21640.22240.21750.22110.22180.22770.22490.23040.22580.23330.22580.23110.22680.230.22870.23390.22970.23280.23110.2360.23290.23760.23570.24010.19330.19570.19410.1980.1960.19980.19910.20250.20120.20440.21080.21750.21270.21750.21470.21750.21810.22290.22140.22590.22080.22680.22250.22680.22430.22680.22550.22970.22730.22970.2280.2320.230.23380.2330.2365b For uncoated hot-rolled, but not standard fasteners with cold rolled threads

c UN series external thread, Max.Diameter

==

External Thread /Internal Thread

Basic - Allowance, for Class 1A a

Basic for Class 3A

NominalSize,TPI,SeriesExt.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.5MaxaMajorClassAllowance0.00120.001200.001200.00110.001100.0010.00100.00100.00090.00090.00080.00130.001300.00130.0012/16-18 UNC/16-18 UNC/16-18 UNC/16-20 UN/16-20 UN55555/16-24 UNF/16-24 UNF/16-24 UNF555/16-27 UNS/16-28 UN/16-28 UN555/16-32 UNEF/16-32 UNEF/16-36 UNS/16-40 UNS/16-48 UNS/8-16 UNC/8-16 UNC/8-16 UNC/8-18 UNS/8-20 UN5555333331A1B2A2B3A3B2A2B3A3B1A1B2A2B3A3B2A2B2A2B3A3B2A2B3A3B2A2B2A2B2A2B1A1B2A2B3A3B2A2B2AMaxMinor0.31130.2650.31130.2650.31250.2630.31130.270.31250.2680.31140.2770.31140.2770.31250.27540.31150.2810.31150.2820.31250.28070.31150.2860.31250.28470.31160.2890.31160.2910.31170.2950.37370.3210.37370.3210.3750.31820.37370.3280.3738MinMajorMinMinor0.29820.2520.30260.2520.30380.2520.30320.2580.30440.2580.30060.2670.30420.2670.30530.2670.30480.2720.3050.2740.3060.2740.30550.2790.30650.2790.30610.2820.30650.2850.30720.290.35950.3070.36430.3070.36560.3070.3650.3150.3657Min b-0.2982---------------0.3595---MaxaPitch0.27520.28430.27520.28170.27640.28030.27880.28520.280.28390.28430.29250.28430.29020.28540.2890.28740.29290.28830.29370.28930.29260.29120.29640.29220.29530.29360.29850.29540.30010.29820.30260.33310.34290.33310.34010.33440.33870.33760.34450.3413MinPitch0.26910.27640.27120.27640.27340.27640.27480.280.2770.280.27880.28540.28060.28540.28270.28540.28390.28840.28490.28930.28670.28930.2880.29220.28980.29220.29050.29450.29250.29630.29550.2990.32660.33440.32870.33440.33110.33440.33330.33890.3372Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.3/8-20 UN3/8-24 UNF/8-24 UNF/8-24 UNF333/8-27 UNS/8-28 UN/8-28 UN333/8-32 UNEF/8-32 UNEF/8-36 UNS/8-40 UNS3330.390?7 UNS7/16-14 UNC/16-14 UNC/16-14 UNC/16-16 UN/16-16 UN77777/16-18 UNS/16-20 UNF/16-20 UNF/16-20 UNF7777/16-24 UNS/16-27 UNS72B3A3B1A1B2A2B3A3B2A2B2A2B3A3B2A2B3A3B2A2B2A2B2A2B1A1B2A2B3A3B2A2B3A3B2A2B1A1B2A2B3A3B2A2B2A0.33200.00110.001100.00110.001100.00100.0010.00090.00110.00140.001400.001400.00130.00130.001300.00110.00110.3750.32970.37390.340.37390.340.3750.33720.37390.3440.37390.3450.3750.34260.3740.3490.3750.34690.3740.3520.37410.3540.38890.3590.43610.3760.43610.3760.43750.37170.43610.3840.43750.380.43620.390.43620.3950.43620.3950.43750.39160.43640.4020.43640.3210.36690.3210.36310.330.36670.330.36780.330.36720.3350.36740.3360.36850.3360.3680.3410.3690.3410.36850.3450.3690.3480.38220.350.42060.360.42580.361.42720.360.42670.370.42810.370.42750.3770.4240.3830.42810.3830.42940.3830.42920.3920.4297-------------0.4206---------0.34790.34250.34650.34680.35530.34680.35280.34790.35160.34980.35560.35070.35640.35180.35530.35370.35910.35470.3580.3560.36120.35790.36280.36480.37060.38970.40030.38970.39720.39110.39570.39550.40280.39690.40140.40010.4070.40370.41310.40370.41040.4050.40910.40930.41530.41230.34250.33940.34250.34110.34790.3430.34790.3450.34790.34620.35090.34710.35180.34910.35180.35030.35470.35220.35470.35280.3570.35480.35880.36120.36590.38260.39110.3850.39110.38760.39110.39090.39690.39350.39690.39580.40140.39750.4050.39950.4050.40190.4050.40550.41040.4087Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.7/16-28 UNEF/16-28 UNEF77/16-32 UN/16-32 UN71/2-12 UNS/2-12 UNS/2-13 UNC/2-13 UNC/2-13 UNC/2-14 UNS/2-16 UN/2-16 UN11111111/2-18 UNS/2-20 UNF/2-20 UNF/2-20 UNF1111/2-24 UNS/2-27 UNS11/2-28 UNEF/2-28 UNEF11/2-32 UN/2-32 UN19/16-12 UNC2B2A2B3A3B2A2B3A3B2A2B3A3B1A1B2A2B3A3B2A2B2A2B3A3B2A2B1A1B2A2B3A3B2A2B2A2B2A2B3A3B2A2B3A3B1A0.4060.001100.00100.001600.00150.001500.0015000.00130.00130.001300.00120.00110.001100.00100.00160.43640.4070.43750.40510.43650.4110.43750.40940.49840.4280.50.42230.49850.4340.49850.4340.50.42840.49850.4380.49860.4460.50.44190.49870.4530.49870.4570.49870.4570.50.45370.49880.4650.49890.4690.49890.470.50.46760.4990.4740.50.47190.56090.3970.42990.3990.4310.3990.43050.4040.43150.4040.4870.410.48860.410.48220.4170.48760.4170.48910.4170.48820.4230.48920.4320.49060.4320.490.440.48650.4460.49060.4460.49190.4460.49160.4550.49220.460.49240.4610.49350.4610.4930.4660.4940.4660.5437-------0.4822---------------0.41810.41320.41890.41430.41780.41620.42160.41720.42050.44430.45290.44590.45110.44850.45970.44850.45650.450.45480.45210.46010.4580.46550.45940.4640.46260.46970.46620.47590.46620.47310.46750.47170.47170.4780.47480.48070.47570.48160.47680.48040.47870.48420.47970.48310.50680.41340.40960.41430.41160.41430.41280.41720.41470.41720.43890.44590.44190.44590.44110.450.44350.450.44630.450.44710.45360.45330.45940.45590.45940.45820.46390.43920.46750.46190.46750.46430.46750.46780.47290.47110.47590.4720.47680.4740.47680.47520.47970.47710.47970.499Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.Ext.Int.99/16-12 UNC/16-12 UNC/16-14 UNS/16-16 UN/16-16 UN99999/16-18 UNF/16-18 UNF/16-18 UNF/16-20 UN/16-20 UN9999/16-24 UNEF/16-24 UNEF/16-27 UNS/16-28 UN/16-28 UN/16-32 UN/16-32 UN9999991B2A2B3A3B2A2B2A2B3A3B1A1B2A2B3A3B2A2B3A3B2A2B3A3B2A2B2A2B3A3B2A2B3A3B0.490.001600.00150.001400.00140.001400.001300.001200.00110.001100.00100.56090.490.56250.48430.5610.5010.56110.5090.56250.5040.56110.5150.56110.5150.56250.51060.56120.520.56250.51620.56130.5270.56250.52440.56140.5310.56140.5320.56250.53010.56150.5360.56250.53440.4720.54950.4720.55110.4720.55070.4850.55170.4950.55310.4950.5480.5020.55240.5020.55380.5020.55310.5080.55440.5080.55410.5170.55530.5170.55470.5220.55490.5240.5560.5240.55550.5290.55650.5290.5437----------------0.51860.50680.51520.50840.51350.51460.52260.52050.5280.52190.52650.5250.53530.5250.53230.52640.53080.52870.53550.530.53410.53420.54050.53540.53920.53730.54320.53820.54410.53930.54290.54120.54670.54220.54560.50840.50160.50840.50450.50840.50960.51610.51580.52190.51840.52190.51820.52640.52050.52640.5230.52640.52450.530.52680.530.53030.53540.53250.53540.53360.53840.53450.53930.53650.53930.53770.54220.53960.5422UNRcMinorDiaMajorDia(Min0.04460.060.04510.060.05380.0730.05440.0730.05590.0730.05650.0730.06420.0860.06480.0860.06680.0860.06740.0860.07340.0990.07410.0990.07710.0990.07780.0990.08140.1120.08220.1120.08640.1120.08710.1120.09440.1250.09520.1250.0972

0.1250.09790.1250.10.1380.10080.1380.10740.1380.10820.1380.12590.1640.12680.1640.13010.1640.13090.1640.13940.190.14040.190.14640.190.15190.190.15280.190.1560.190.15920.190.16440.190.16810.190.16540.2160.16640.2160.17240.2160.17340.2160.17790.216

0.17880.2160.18210.2160.18350.2160.19040.2160.19410.2160.18940.250.18940.250.19050.250.19930.250.20490.250.20640.250.20640.250.20740.250.21180.250.21280.250.21610.250.21930.250.22430.25

0.2280.25

ce, to the basic size.

threads

1A and 2AA

UNRcMinorDiaMajorDia(Min0.24520.31250.24520.31250.24640.31250.25180.31250.2530.31250.26180.31250.26180.31250.26290.31250.26740.31250.26890.31250.26990.31250.27430.31250.27530.31250.27850.31250.28180.31250.28690.31250.29920.3750.29920.3750.30050.3750.30760.3750.3143

0.3750.31550.3750.32430.3750.32430.3750.32540.3750.32980.3750.33130.3750.33240.3750.33680.3750.33780.3750.34090.3750.34430.3750.34480.390.35110.43750.35110.43750.35250.43750.36160.43750.3630.43750.37010.43750.37670.43750.37670.43750.3780.43750.38680.43750.3923

0.43750.38380.43750.39490.43750.39930.43750.40030.43750.39920.50.40080.50.40690.50.40690.50.40840.50.41350.50.42410.50.42550.50.43260.50.43920.50.43920.50.44050.50.44920.50.45480.50.45630.50.45740.50.46180.50.46280.50.4617

0.56250.46170.56250.46330.56250.4760.56250.48660.56250.4880.56250.4950.56250.4950.56250.49640.56250.50170.56250.5030.56250.51170.56250.51290.56250.51730.56250.51880.56250.51990.56250.52430.56250.52530.5625