美制螺纹尺寸表(mm)
美制一般密封管螺纹的基本尺寸
6. 75 21. 431
7. 50 23. 812
7. 66 24. 320
8. 50 26. 988
9. 68 30. 734
10. 88 34. 544
12. 50 39. 688
14. 50 46. 038
16. 00 50.800
17. 00 53. 975
19. 00 60. 325
装配余量 L3
尺寸代号 牙数 n
螺距 P
1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 8 10 12 14 O. D. 16 O. D. 18 O. D. 20 O. D. 24 O. D.
27 27 18 18 14 14 11. 5 11. 5 11. 5 11. 5 8 8 8 8 8 8 8 8 8 8 8 8 8 8
可参考表中的最右边列数据选择攻丝前的麻花钻直径 螺纹收尾长度（V)=3.75P O. D. 是英文管子外径 （ outside diameter ） 的缩写。 标记：美制一般密封管螺纹的完整标记由螺纹特征代号 ，螺纹尺寸代号 和旋向代号组成 。 左旋螺纹的旋向代号为 LH：右旋螺纹的旋向代号省略不标 。 例如：1/8 NPT-LH, 1/8 表示螺纹尺寸 ，NPT 为螺纹特征代号 ，LH 表示左
圈数 3
mm. 233
3
4. 233
3
5. 443
3
5. 443
3
6. 626
3
6. 350
3
6. 350
3
6. 350
2
6. 350
2
6. 350
2
6. 350
螺纹号(美制)
最大最小最小1最大最小公差范圍最小最大最小最大公差范圍2A 0.00050.05950.0563…0.05140.04960.00180.04462B 0.04650.05140.05190.05420.00230.06003A 0.00000.06000.0568…0.05190.05060.00130.04513B 0.04650.05140.05190.05360.00170.06002A 0.00060.07240.0686…0.06230.06030.00200.05382B 0.05610.06230.06290.06550.00260.07303A 0.00000.07300.0692…0.06290.06140.00150.05443B 0.05610.06230.06290.06480.00190.07302A 0.00060.07240.0689…0.06340.06150.00190.05592B 0.05800.06350.06400.06650.00250.07303A 0.00000.07300.0695…0.06400.06260.00140.05653B 0.05800.06350.06400.06590.00190.07302A 0.00060.08540.0813…0.07380.07170.00210.06422B 0.06670.07370.07440.07720.00280.08603A 0.00000.08600.0819…0.07440.07280.00160.06483B 0.06670.07370.07440.07650.00210.08602A 0.00060.08540.0816…0.07530.07330.00200.06682B 0.06910.07530.07590.07860.00270.08603A 0.00000.08600.0822…0.07590.07440.00150.06743B 0.06910.07530.07590.07790.00200.08602A 0.00070.09830.0938…0.08480.08250.00230.07342B 0.07640.08450.08550.08850.00300.09903A 0.00000.09900.0945…0.08550.08380.00170.07413B 0.07640.08450.08550.08770.00220.09902A 0.00070.09830.0942…0.08670.08450.00220.07712B 0.07970.08650.08740.09020.00280.09903A 0.00000.09900.0949…0.08740.08580.00160.07783B 0.07970.08650.08740.08950.00210.09902A 0.00080.11120.1061…0.09500.09250.00250.08142B 0.08490.09390.09580.09910.00330.11203A 0.00000.11200.1069…0.09580.09390.00190.08223B 0.08490.09390.09580.09820.00240.11202A 0.00070.11130.1068…0.09780.09540.00240.08642B 0.08940.09680.09850.10160.00310.11203A 0.00000.11200.1075…0.09850.09670.00180.08713B 0.08940.09680.09850.10080.00230.11202A 0.00080.12420.1191…0.10800.10540.00260.09442B 0.09790.10620.10880.11210.00330.12503A 0.00000.12500.1199…0.10880.10690.00190.09523B 0.09790.10620.10880.11130.00250.12502A 0.00070.12430.1195…0.10950.10700.00250.09722B 0.10040.10790.11020.11340.00320.12503A 0.00000.12500.1202…0.11020.10830.00190.09793B 0.10040.10790.11020.11260.00240.12502A 0.00080.13720.1312…0.11690.11410.00280.10002B 0.10400.1140.11770.12140.00370.13803A 0.00000.13800.1320…0.11770.11560.00210.10083B 0.10400.11400.11770.12040.00270.13802A 0.00080.13720.1321…0.12100.11840.00260.10742B 0.1110.1190.12180.12520.00340.13803A 0.00000.13800.1329…0.12180.11980.00200.10823B 0.11100.11860.12180.12430.00250.13802A 0.00090.16310.1571…0.14280.13990.00290.12592B 0.1300.1390.14370.14750.00380.16403A 0.00000.16400.1580…0.14370.14150.00220.12683B 0.13000.13890.14370.14650.00280.16402A 0.00080.16320.1577…0.14520.14240.00280.13012B 0.1340.1420.14600.14960.00360.16403A 0.00000.16400.1585…0.14600.14390.00210.13093B0.13400.14160.14600.14870.00270.16406-40/0.138-40UNF 8-32/0.164-32UNC 8-36/0.164-36UNF0-80/0.060-80UNF 1-64/0.073-64UNC 1-72/0.073-72UNF 允許偏差倒2-56/0.086-56UNC 2-64/0.086-64UNF 等級角最小等級5-44/0.125-44UNF 3-48/0.099-48UNC 3-56/0.099-56UNF 4-48/0.112-48UNF 4-40/0.112-40UNC 6-32/0.138-32UNC 5-40/0.125-40UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00100.18900.1818…0.16190.15860.00330.13942B 0.1450.1560.16290.16720.00430.19003A 0.00000.19000.1828…0.16290.16040.00250.14043B 0.14500.15550.16290.16610.00320.19002A 0.00090.18910.1831…0.16880.16580.00300.15192B 0.1560.1640.16970.17360.00390.19003A 0.00000.19000.1840…0.16970.16740.00230.15283B 0.15600.16410.16970.17260.00290.19002A 0.00100.21500.2078…0.18790.18450.00340.16542B 0.1710.1810.18890.19330.00440.21603A 0.00000.21600.2088…0.18890.18630.00260.16643B 0.17100.18070.18890.19220.00330.21602A 0.00100.21500.2085…0.19180.18860.00320.17242B 0.1770.1860.19280.19700.00420.21603A 0.00000.21600.2095…0.19280.19040.00240.17343B 0.17700.18570.19280.19590.00310.21602A 0.00090.21510.2091…0.19480.19170.00310.17792B 0.1820.1900.19570.19980.00410.21603A 0.00000.21600.2100…0.19570.19330.00240.17883B 0.18200.18950.19570.19880.00310.21601A 0.00110.24890.2367…0.21640.21080.00560.18941B 0.1960.2070.21750.22480.00730.25002A 0.00110.24890.24080.23670.21640.21270.00370.18942B 0.1960.2070.21750.22240.00490.25003A 0.00000.25000.2419…0.21750.21470.00280.19053B 0.19600.20670.21750.22110.00360.25001A 0.00100.24900.2392…0.22580.22080.00500.20641B 0.2110.2200.22680.23330.00650.25002A 0.00100.24900.2425…0.22580.22250.00330.20642B 0.2110.2200.22680.23110.00430.25003A 0.00000.25000.2435…0.22680.22430.00250.20743B 0.21100.21900.22680.23000.00320.25002A 0.00100.24900.2430…0.22870.22550.00320.21182B 0.2160.2240.22970.23390.00420.25003A 0.00000.25000.2440…0.22970.22730.00240.21283B 0.21600.22290.22970.23280.00310.25001A 0.00120.31130.2982…0.27520.26910.00610.24521B 0.2520.2650.27640.28430.00790.31252A 0.00120.31130.30260.29820.27520.27120.00400.24522B 0.2520.2650.27640.28170.00530.31253A 0.00000.31250.3038…0.27640.27340.00300.24643B 0.25200.26300.27640.28030.00390.31252A 0.00120.31130.3032…0.27880.27480.00400.25182B 0.2580.2700.28000.28520.00570.31253A 0.00000.31250.3044…0.28000.27700.00300.25303B 0.25800.26800.28000.28390.00390.31251A 0.00110.31140.3006…0.28430.27880.00550.26181B 0.2670.2770.28540.29250.00710.31252A 0.00110.31140.3042…0.28430.28060.00370.26182B 0.2670.2770.28540.29020.00480.31253A 0.00000.31250.3053…0.28540.28270.00270.26293B 0.26700.27540.28540.28900.00360.31252A 0.00100.31150.3050…0.28830.28490.00340.26892B 0.2740.2820.28930.29370.00440.31253A 0.00000.31250.3060…0.28930.28670.00260.26993B 0.27400.28070.28930.29260.00330.31252A 0.00100.31160.3055…0.29120.28800.00320.27432B 0.2790.2860.29220.29640.00420.31253A 0.00000.31250.3065…0.29220.28980.00240.27533B0.27900.28470.29220.29530.00310.31255/16-32/0.3125-32UNEF5/16-20/0.3125-20UN 5/16-24/0.3125-24UNF 5/16-28/0.3125-28UN1/4-28/0.250-28UNF 1/4-32/0.250-32UNEF 5/16-18/0.3125-18UNC 12-28/0.216-28UNF 12-32/0.216-32UNEF 1/4-20/0.250-20UNC10-24/0.190-24UNC 10-32/0.190-32UNF 12-24/0.216-24UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級1A 0.00130.37370.3595…0.33310.32660.00650.29921B 0.3070.3210.33440.34290.00850.37502A 0.00130.37370.36430.35950.33310.32870.00440.29922B 0.3070.3210.33440.34010.00570.37503A 0.00000.37500.3656…0.33440.33110.00330.30053B 0.30700.31820.33440.33870.00430.37502A 0.00120.37380.3657…0.34130.33720.00410.31432B 0.3210.3320.34250.34790.00540.37503A 0.00000.37500.3669…0.34250.33940.00310.31553B 0.32100.32970.34250.34650.00400.37501A 0.00110.37390.3631…0.34680.34110.00570.32431B 0.3300.3400.34790.35530.00740.37502A 0.00110.37390.3667…0.34680.34300.00380.32432B 0.3300.3400.34790.35280.00490.37503A 0.00000.37500.3678…0.34790.34500.00290.32543B 0.33000.33720.34790.35160.00370.37502A 0.00110.37390.3674…0.35070.34710.00360.33132B 0.3360.3450.35180.35640.00460.37503A 0.00000.37500.3685…0.35180.34910.00270.33243B 0.33600.34260.35180.35530.00350.37502A 0.00100.37400.3680…0.35370.35030.00340.33682B 0.3410.3490.35470.35910.00440.37503A 0.00000.37500.3690…0.35470.35220.00250.33783B 0.34100.34690.35470.35800.00330.37501A 0.00140.43610.4206…0.38970.38260.00710.35111B 0.3600.3760.39110.40030.00920.43752A 0.00140.43610.42580.42060.38970.38500.00470.35112B 0.3600.3760.39110.39720.00610.43753A 0.00000.43750.4272…0.39110.38760.00350.35253B 0.36000.37170.39110.39570.00460.43752A 0.00140.43610.4267…0.39550.39090.00460.36162B 0.3700.3840.39690.40280.00590.43753A 0.00000.43750.4281…0.39690.39350.00340.36303B 0.37000.38000.39690.40140.00450.43751A 0.00130.43620.4240…0.40370.39750.00620.37671B 0.3830.3950.40500.41310.00810.43752A 0.00130.43620.4281…0.40370.39950.00420.37672B 0.3830.3950.40500.41040.00540.43753A 0.00000.43750.4294…0.40500.40190.00310.37803B 0.38300.39160.40500.40910.00410.43752A 0.00110.43640.4299…0.41320.40960.00360.39382B 0.3990.4070.41430.41890.00460.43753A 0.00000.43760.4310…0.41430.41160.00270.39493B 0.39900.40510.41430.41780.00350.43752A 0.00100.43650.4305…0.41620.41280.00340.39932B 0.4040.4110.41720.42160.00440.43753A 0.00000.43750.4315…0.41720.41470.00250.40033B 0.40400.40940.41720.42050.00330.43751A 0.00150.49850.4822…0.44850.44110.00740.40691B 0.4170.4340.45000.45970.00970.50002A 0.00150.49850.48760.48220.44850.44350.00500.40692B 0.4170.4340.45000.45650.00650.50003A 0.00000.50000.4891…0.45000.44630.00370.40843B 0.41700.42840.45000.45480.00480.50002A 0.00140.49860.4892…0.45800.45330.00470.42412B 0.4320.4460.45940.46550.00610.50003A 0.00000.50000.4906…0.45940.45590.00350.42553B 0.43200.44190.45940.46400.00460.50001A 0.00130.49870.4865…0.46620.45980.00640.43921B 0.4460.4570.46750.47590.00840.50002A 0.00130.49870.4906…0.46620.46190.00430.43922B 0.4460.4570.46750.47310.00560.50003A 0.00000.50000.4919…0.46750.46430.00320.44053B0.44600.45370.46750.47170.00420.50003/8-24/0.375-24UNF 3/8-28/0.375-28UN 3/8-16/0.375-16UNC 3/8-20/0.375-20UN 3/8-32/0.375-32UNEF 7/16-14/0.4375-14UNC 7/16-28/0.4375-28UNEF 7/16-32/0.4375-32UN 7/16-16/0.4375-16UN 7/16-20/0.4375-20UNF1/2-20/0.500-20UNF1/2-13/0.500-13UNC 1/2-16/0.500-16UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00110.49890.4924…0.47570.47200.00370.45632B 0.4610.4700.47680.48160.00480.50003A 0.00000.50000.4935…0.47680.47400.00280.45743B 0.46100.46760.47680.48040.00360.50002A 0.00100.49900.4930…0.47870.47520.00350.46182B 0.4660.4740.47970.48420.00450.50003A 0.00000.50000.4940…0.47970.47710.00260.46283B 0.46600.47190.47970.48310.00340.50001A 0.00160.56090.5437…0.50680.49900.00780.46171B 0.4720.4900.50840.51860.01020.56252A 0.00160.56090.54950.54370.50680.50160.00520.46172B 0.4720.4900.50840.51520.00680.56253A 0.00000.56250.5511…0.50840.50450.00390.46333B 0.47200.48430.50840.51350.00510.56252A 0.00140.56110.5517…0.52050.51580.00470.48662B 0.4950.5090.52190.52800.00610.56253A 0.00000.56250.5531…0.52190.51840.00350.48803B 0.49500.50400.52190.52650.00460.56251A 0.00140.56110.5480…0.52500.51820.00680.49501B 0.5020.5150.52640.53530.00890.56252A 0.00140.56110.5524…0.52500.52050.00450.49502B 0.5020.5150.52640.53230.00590.56253A 0.00000.56250.5538…0.52640.52300.00340.49643B 0.50200.51060.52640.53080.00440.56252A 0.00130.56120.5531…0.52870.52450.00420.50172B 0.5080.5200.53000.53550.00550.56253A 0.00000.56260.5544…0.53000.52680.00320.50303B 0.50800.51620.53000.53410.00410.56252A 0.00120.56130.5541…0.53420.53030.00390.51172B 0.5170.5270.53540.54050.00510.56253A 0.00000.56250.5553…0.53540.53250.00290.51293B 0.5170.52440.53540.53920.00380.56252A 0.00110.56140.5549…0.53820.53450.00370.51882B 0.5240.5320.53930.54410.00480.56253A 0.00000.56250.5560…0.53930.53650.00280.51993B 0.52400.53010.53930.54290.00360.56252A 0.00100.56150.5555…0.54120.53770.00350.52432B 0.5290.5360.54220.54670.00450.56253A 0.00000.56250.5565…0.54220.53960.00260.52533B 0.52900.53440.54220.54560.00340.56251A 0.00160.62340.6052…0.56440.55610.00830.51521B 0.5270.5460.56600.57670.01070.62502A 0.00160.62340.61130.60520.56440.55890.00560.51522B 0.5270.5460.56600.57320.00720.62503A 0.00000.62500.6129…0.56600.56190.00410.51683B 0.52700.53910.56600.57140.00540.62502A 0.00160.62340.6120…0.56930.56390.00540.52422B 0.5350.5530.57090.57800.00710.62503A 0.00000.62500.6136…0.57090.56680.00410.52583B 0.53500.54630.57090.57620.00530.62502A 0.00140.63260.6142…0.58300.57820.00480.54912B 0.5570.5710.58440.59060.00620.62503A 0.00000.62500.6156…0.58440.58080.00360.55053B 0.55700.56620.58440.58900.00460.62501A 0.00140.62360.6105…0.58750.58050.00700.55751B 0.5650.5780.58890.59800.00910.62502A 0.00140.62360.6149…0.58750.58280.00470.55752B 0.5650.5780.58890.59490.00600.62503A 0.00000.62500.6163…0.58890.58540.00350.55893B0.5650.57300.58890.59340.00450.62505/8-18/0.625-18UNF5/8-11/0.625-11UNC 5/8-12/0.625-12UN 5/8-16/0.625-16UN 9/16-24/0.5625-24UNEF 9/16-28/0.5625-28UN 9/16-32/0.5625-32UN 9/16-20/0.5625-20UN1/2-28/0.500-28UNEF 9/16-16/0.5625-16UN 9/16-18/0.5625-18UNF 1/2-32/0.500-32UN 9/16-12/0.5625-12UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00130.62370.6156…0.59120.58690.00430.56422B 0.5710.5820.59250.59810.00560.62503A 0.00000.62500.6169…0.59250.58930.00320.56553B 0.57100.57870.59250.59670.00420.62502A 0.00120.62380.6166…0.59670.59270.0040057422B 0.5800.5900.59790.60310.00520.62503A 0.00000.62500.6178…0.59790.59490.00300.57543B 0.58000.58690.59790.60180.00390.62502A 0.00110.62390.6174…0.60070.59690.00380.58132B 0.5860.5950.60180.60670.00490.62503A 0.00000.62500.6185…0.60180.59900.00280.58243B 0.58600.59260.60180.60550.00370.62502A 0.00110.62390.6179…0.60360.60000.00360.58672B 0.5910.5900.60470.60930.00460.62503A 0.00000.62500.6190…0.60470.60200.00270.58783B 0.59100.59690.60470.60820.00350.62502A 0.00160.68590.6745…0.63180.62640.00540.58672B 0.5970.6150.63340.64050.00710.68753A 0.00000.68750.6761…0.63340.62930.00410.58833B 0.5970.60850.63340.63870.00530.68752A 0.00140.68610.6767…0.64550.64070.00480.61162B 0.6200.6340.64690.65310.00620.68753A 0.00000.68750.6781…0.64690.64330.00360.61303B 0.62000.62840.64690.65150.00460.68752A 0.00130.68820.6781…0.65370.64940.00430.62672B 0.6330.6450.65500.66060.00560.68753A 0.00000.68750.6794…0.65500.65180.00320.62803B 0.63300.64120.65500.65920.00420.68752A 0.00120.68630.6791…0.65920.65520.00400.63672B 0.6420.6520.66040.66560.00520.68753A 0.00000.68750.6803…0.66040.65740.00300.63793B 0.64200.64940.66040.66430.00390.68752A 0.00110.68640.6799…0.66320.65940.00380.64382B 0.6490.6570.66430.66920.00490.68753A 0.00000.68750.6810…0.66430.66150.00280.64493B 0.64900.65510.66430.66800.00370.68752A 0.00110.68640.6804…0.66610.66250.00380.64922B 0.6540.6610.66720.67180.00460.68753A 0.00000.68750.6815…0.66720.66450.00270.65033B 0.65400.65940.66720.67070.00350.68751A 0.00180.74820.7288…0.68320.67440.00880.62911B 0.6420.6630.68500.69650.01150.75002A 0.00180.74820.73530.72880.68320.67730.00590.62912B 0.6420.6630.68500.69270.00770.75003A 0.00000.75000.7371…0.68500.68060.00440.63093B 0.64200.65450.68500.69070.00570.75002A 0.00170.74830.7369…0.69420.68870.00550.64912B 0.6600.6780.69590.70310.00720.75003A 0.00000.75000.7386…0.69590.69180.00410.65083B 0.66000.67070.69590.70130.00540.75001A 0.00150.74850.7343…0.70790.70040.00750.67401B 0.6820.6960.70940.71920.00980.75002A 0.00150.74850.7391…0.70790.70290.00500.67402B 0.6820.6960.70940.71590.00650.75003A 0.00000.75000.7406…0.70940.70560.00380.67553B 0.68200.69080.70940.71430.00490.75002A 0.00130.74870.7406…0.71620.71180.00440.68922B 0.6960.7070.71750.72320.00570.75003A 0.00000.75000.7419…0.71750.71420.00330.69053B0.69600.70370.71750.72180.00430.75005/8-28/0.625-28UN 5/8-20/0.625-20UN 5/8-24/0.625-24UNEF 11/16-16/0.6875-16UN 11/16-20/0.6875-20UN5/8-32/0.625-32UN 11/16-12/0.6875-12UN 11/16-32/0.6875-32UN 3/4-10/0.750-10UNC 11/16-24/0.6875-24UNEF 11/16-28/0.6875-28UN 3/4-20/0.750-20UN3/4-12/0.750-12UN 3/4-16/0.750-16UNF最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00120.74880.7423…0.72560.72180.00380.70622B 0.7110.7200.72680.73180.00500.75003A 0.00000.75000.7435…0.72680.72390.00290.70743B 0.71100.71760.72680.73050.00370.75002A 0.00110.74890.7429…0.72860.72500.00360.71172B 0.7160.7240.72970.73440.00470.75003A 0.00000.75000.7440…0.72970.72700.00270.71283B 0.71600.72190.72970.73330.00360.75002A 0.00170.81080.7994…0.75670.75120.00550.71162B 0.7220.7400.75840.76560.00720.81253A 0.00000.81250.8011…0.75840.75430.00410.71333B 0.72200.73290.75840.76380.00540.81252A 0.00150.81100.8016…0.77040.76550.00490.73652B 0.7450.7590.77190.77820.00630.81253A 0.00000.81250.8031…0.77190.76830.00360.73803B 0.74500.75330.77190.77660.00470.81252A 0.00130.81120.8031…0.77870.77430.00440.75172B 0.7580.7700.78000.78570.00570.81253A 0.00000.81250.8044…0.78000.77670.00330.75303B 0.75800.76620.78000.78430.00430.81252A 0.00120.81130.8048…0.78810.78430.00380.76872B 0.7740.7820.78930.79430.00500.81253A 0.00000.81250.8060…0.78930.78640.00290.76993B 0.77400.78010.78930.79300.00370.81252A 0.00110.81140.8054…0.79110.78750.00360.77422B 0.7790.7860.79220.79690.00470.81253A 0.00000.81250.8065…0.79220.78950.00270.77533B 0.77900.78440.79220.79580.00360.81251A 0.00190.87310.8523…0.80090.79140.00950.74081B 0.7550.7780.80280.81510.01230.87502A 0.00190.87310.85920.85230.80090.79460.00630.74082B 0.7550.7780.80280.81100.00820.87503A 0.00000.87500.8611…0.80280.79810.00470.74273B 0.75500.76810.80280.80890.00610.87502A 0.00170.87330.8619…0.81920.81370.00550.77412B 0.7850.8030.82090.82810.00720.87503A 0.00000.87500.8636…0.82090.81680.00410.77583B 0.78500.79480.82090.82630.00540.87501A 0.00160.87340.8579…0.82700.81890.00810.78841B 0.7980.8140.82860.83920.01060.87502A 0.00160.87340.8631…0.82700.82160.00540.78842B 0.7980.8140.82860.83560.00700.87503A 0.00000.87500.8647…0.82860.82450.00410.79003B 0.79800.80680.82860.83390.00530.87502A 0.00150.87350.8641…0.83290.82800.00490.79002B 0.8070.8210.83440.84070.00630.87503A 0.00000.87500.8656…0.83440.83080.00360.80053B 0.80700.81580.83440.83910.00470.87502A 0.00130.87370.8656…0.84120.83680.00440.81422B 0.8210.8320.84250.84820.00570.87503A 0.00000.87500.8669…0.84250.83920.00330.81553B 0.82100.82870.84250.84680.00430.87502A 0.00120.87380.8673…0.85060.84680.00380.83122B 0.8360.8450.85180.85680.00500.87503A 0.00000.87500.8685…0.85180.84890.00290.83243B 0.83600.84260.85180.85550.00370.87502A 0.00110.87390.8679…0.85360.85000.00360.83672B 0.8410.8490.85470.85940.00470.87503A 0.00000.87500.8690…0.85470.85200.00270.83783B0.84100.84690.85470.85830.00360.87507/8-20/0.875-20UNEF 7/8-28/0.875-28UN 7/8-32/0.875-32UN7/8-12/0.875-12UN 7/8-14/0.875-14UNF 7/8-16/0.875-16UN 3/4-28/0.750-28UN 13/16-16/0.8125-16UN13/16-20/0.8125-20UNEF 3/4-32/0.750-32UN 13/16-12/0.8125-12UN 7/8-9/0.875-9UNC 13/16-28/0.8125-28UN 13/16-32/0.8125-32UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.00170.93580.9244…0.88170.87600.00570.83662B 0.8470.8650.88340.89080.00740.93753A 0.00000.93750.9261…0.88340.87930.00410.83833B 0.84700.85750.88340.88890.00550.93752A 0.00150.93600.9266…0.89540.89040.00500.86152B 0.8700.8840.89690.90340.00650.93753A 0.00000.93750.9281…0.89690.89320.00370.86303B 0.87000.87830.89690.90180.00490.93752A 0.00140.93610.9280…0.90360.89910.00450.87662B 0.8830.8950.90500.91090.00590.93753A 0.00000.93750.9294…0.90500.90160.00340.87803B 0.88300.89120.90500.90940.00440.93752A 0.00120.93630.9298…0.91310.90910.00400.89372B 0.8990.9070.91430.91950.00520.93753A 0.00000.93750.9310…0.91430.91130.00300.89493B 0.89900.90510.91430.91820.00390.93752A 0.00110.93640.9304…0.91610.91230.00380.89922B 0.9040.9110.91720.92210.00490.93753A 0.00000.93750.9315…0.91720.91440.00280.90033B 0.90400.90940.91720.92090.00370.93751A 0.00200.99800.9755…0.91680.90670.01010.84921B 0.8650.8900.91880.93200.0132 1.00002A 0.00200.99800.98300.97550.91680.91000.00680.84922B 0.8650.8900.91880.92760.0088 1.00003A 0.0000 1.00000.9850…0.91880.91370.00510.85123B 0.86500.87970.91680.92540.0066 1.00001A 0.00180.99820.9810…0.94410.93530.00880.89901B 0.9100.9280.94590.95730.0114 1.00002A 0.00180.99820.9868…0.94410.93820.00590.89902B 0.9100.9280.94590.95350.0076 1.00003A 0.0000 1.00000.9886…0.94590.94150.00440.90083B 0.91000.91980.94590.95160.0057 1.00001A 0.00170.99830.9828…0.95190.94350.00840.91321B 0.9230.9380.95360.96450.0109 1.00002A 0.00170.99830.9880…0.95190.94630.00560.91322B 0.9230.9380.95360.96090.0073 1.00003A 0.0000 1.00000.9897…0.95360.94940.00420.91493B 0.92300.93160.95360.95900.0054 1.00002A 0.00150.99850.9891…0.95790.95290.00500.92402B 0.9320.9460.95940.96590.0065 1.00003A 0.0000 1.00000.9906…0.95940.95570.00370.92553B 0.93200.94080.95940.96430.0049 1.00002A 0.00140.99860.9905…0.96610.96160.00450.93912B 0.9460.9570.96750.97340.0059 1.00003A 0.0000 1.00000.9919…0.96750.96410.00340.94053B 0.94600.95370.96750.97190.0044 1.00002A 0.00120.99880.9923…0.97560.97160.00400.95622B 0.9610.9700.97680.98200.0052 1.00003A 0.0000 1.00000.9935…0.97680.97380.00300.95743B 0.96100.96760.97680.98070.0039 1.00002A 0.00110.99890.9929…0.97860.97480.00380.96172B 0.9660.9740.97970.98460.0049 1.00003A 0.0000 1.00000.9940…0.97970.97690.00280.96283B 0.96600.97190.97970.98340.0037 1.00002A 0.0020 1.06051.0455…0.97930.97250.00680.91172B 0.9270.9520.98130.99020.0089 1.06253A 0.0000 1.06251.0475…0.98130.97620.00510.91373B0.92700.94220.98130.98800.0067 1.06251-1/16-8/1.0625-8UN1-20/1.000-20UNEF1-28/1.000-28UN1-32/1.000-32UN1-12/1.000-12UNF 1-14/1.000-14UNS(5)1-16/1.000-16UN15/16-28/0.9375-28UN15/16-32/0.9375-32UN1-8/1.000-8UNC 15/16-12/0.9375-12UN15/16-16/0.9375-16UN15/16-20/0.9375-20UNEF最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0017 1.06081.0494… 1.00671.00100.00570.96162B 0.9720.990 1.00841.01580.0074 1.06253A 0.0000 1.06251.0511… 1.00841.00420.00420.96333B 0.97200.98231.00841.01390.0055 1.06252A 0.0015 1.06101.0516… 1.02041.01540.00500.98652B 0.995 1.009 1.02191.02840.0065 1.06253A 0.0000 1.06251.0531… 1.02191.01820.00370.98803B 0.99501.00331.02191.02680.0049 1.06252A 0.0014 1.06111.0524… 1.02501.02030.00470.99502B 1.002 1.015 1.02641.03260.0062 1.06253A 0.0000 1.06251.0538… 1.02641.02280.00360.99643B 1.00201.01051.02641.03100.0046 1.06252A 0.0014 1.06111.0530… 1.02861.02410.0045 1.00162B 1.008 1.020 1.03001.03590.0059 1.06253A 0.0000 1.06251.0544… 1.03001.02660.0034 1.00303B 1.00801.01621.03001.03440.0044 1.06252A 0.0012 1.06131.0548… 1.03811.03410.0040 1.01872B 1.024 1.032 1.03931.04450.0052 1.06253A 0.0000 1.06251.0560… 1.03931.03630.0030 1.01993B 1.02401.03011.03931.04320.0039 1.06251A 0.0022 1.12281.0982… 1.03001.0191 1.01090.95271B 0.9700.998 1.03221.04630.0141 1.12502A 0.0022 1.12281.10641.09821.03001.02280.00720.95272B 0.9700.998 1.03221.04160.0094 1.12503A 0.0000 1.12501.1086… 1.03221.02680.00540.95493B 0.97000.98751.03221.03930.0071 1.12502A 0.0021 1.12291.10791.10041.04171.03480.00690.97412B 0.990 1.015 1.04381.05280.0080 1.12503A 0.0000 1.12501.1100… 1.04381.03860.00520.97623B 0.99001.00471.04381.05050.0067 1.12501A 0.0018 1.12321.1060… 1.06911.06010.0090 1.02401B 1.035 1.053 1.07091.08260.0117 1.12502A 0.0018 1.12321.1118… 1.06911.06310.0060 1.02402B 1.035 1.053 1.07091.07870.0078 1.12503A 0.0000 1.12501.1136… 1.07091.06640.0045 1.02583B 1.03501.04481.07091.07680.0059 1.12502A 0.0015 1.12351.1141… 1.08291.07790.0050 1.04902B 1.057 1.071 1.08441.09090.0065 1.12503A 0.0000 1.12501.1156… 1.08441.08070.00370.05053B 1.05701.06581.08441.08930.0049 1.12502A 0.0014 1.12361.1149… 1.08751.08280.0047 1.05752B 1.065 1.078 1.08891.09510.0062 1.12503A 0.0000 1.12501.1163… 1.08891.08530.0036 1.05893B 1.06501.07301.08891.09350.0046 1.12502A 0.0014 1.12361.1155… 1.09111.08660.0045 1.06412B 1.071 1.082 1.09251.09840.0059 1.12503A 0.0000 1.12501.1169… 1.09251.08910.0034 1.06553B 1.07101.07871.09251.09690.0044 1.12502A 0.0012 1.12381.1173… 1.10061.09660.0040 1.08122B 1.086 1.095 1.10181.10700.0052 1.12503A 0.0000 1.12501.1185… 1.10181.09880.0030 1.08243B 1.08601.09261.10181.10570.0039 1.12502A 0.0021 1.18541.1704… 1.10421.09720.0070 1.03662B 1.052 1.077 1.10631.11540.0091 1.18753A 0.0000 1.18751.1725… 1.10631.10110.0052 1.03873B 1.05201.06721.10631.11310.0068 1.18752A 0.0017 1.18581.1744… 1.13171.12590.0058 1.08662B 1.097 1.115 1.13341.14090.0075 1.18753A 0.0000 1.18751.1761… 1.13341.12910.00431.08833B1.09701.10731.13341.13900.0056 1.18751-1/8-28/1.125-28UN 1-3/16-8/1.1875-8UN 1-3/16-12/1.1875-12UN1-1/8-16/1.125-16UN 1-1/8-18/1.125-18UNEF 1-1/8-20/1.125-20UN 1-1/8-7/1.125-7UNC 1-1/8-8/1.125-8UN 1-1/8-12/1.125-12UNF 1-1/16-18/1.0625-18UNEF 1-1/16-20/1.0625-20UN 1-1/16-28/1.0625-28UN 1-1/16-12/1.0625-12UN 1-1/16-16/1.0625-16UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0015 1.18601.1766… 1.14541.14030.0051 1.11152B 1.120 1.134 1.14691.15350.0066 1.18753A 0.0000 1.18751.1781… 1.14691.14310.0038 1.11303B 1.12001.12831.14691.15190.0050 1.18752A 0.0015 1.18601.1773… 1.14991.14500.0049 1.11992B 1.127 1.140 1.15141.15770.0063 1.18753A 0.0000 1.18751.1788… 1.15141.14780.0036 1.12143B 1.12701.13551.15141.15610.0047 1.18752A 0.0014 1.18611.1780… 1.15361.14890.0047 1.12662B 1.133 1.145 1.15501.16110.0061 1.18753A 0.0000 1.18751.1794… 1.15501.15150.0035 1.12803B 1.13301.14121.15501.15950.0045 1.18752A 0.0012 1.18631.1798… 1.16311.15900.0041 1.14372B 1.149 1.157 1.16431.16960.0053 1.18753A 0.0000 1.18751.1810… 1.16431.16120.0031 1.14493B 1.14901.15511.16431.16830.0040 1.18751A 0.0022 1.24781.2232… 1.15501.14390.0111 1.07771B 1.095 1.123 1.15721.17160.0144 1.25002A 0.0022 1.24781.23141.22321.15501.14760.0074 1.07772B 1.095 1.123 1.15721.16680.0096 1.25003A 0.0000 1.25001.2336… 1.15721.15170.0055 1.07993B 1.09501.11251.15721.16440.0072 1.25002A 0.0021 1.24791.23291.22541.16671.15970.0070 1.09912B 1.115 1.140 1.16881.17800.0092 1.25003A 0.0000 1.25001.2350… 1.16881.16350.0053 1.10123B 1.11501.12971.16881.17570.0069 1.25001A 0.0018 1.24821.2310… 1.19411.18490.0092 1.14901B 1.160 1.178 1.19591.20790.0120 1.25002A 0.0018 1.24821.2368… 1.19411.18790.0062 1.14902B 1.160 1.178 1.19591.20390.0080 1.25003A 0.0000 1.25001.2386… 1.19591.19130.0046 1.15083B 1.16001.16981.19591.20190.0060 1.25002A 0.0015 1.24851.2391… 1.20791.20280.0051 1.17402B 1.182 1.196 1.20941.21600.0066 1.25003A 0.0000 1.25001.2406… 1.20941.20560.0038 1.17553B 1.18201.19081.20941.21440.0050 1.25002A 0.0015 1.24851.2398… 1.21241.20750.0049 1.18242B 1.190 1.203 1.21391.22020.0063 1.25003A 0.0000 1.25001.2413… 1.21391.21030.0036 1.18393B 1.19001.19801.21391.21860.0047 1.25002A 0.0014 1.24861.2405… 1.21611.21140.0047 1.18912B 1.196 1.207 1.21751.22360.0061 1.25003A 0.0000 1.25001.2419… 1.21751.21400.0035 1.19053B 1.19601.20371.21751.22200.0045 1.25002A 0.0012 1.24881.2423… 1.22561.22150.0041 1.20622B 1.211 1.220 1.22681.23210.0053 1.25003A 0.0000 1.25001.2435… 1.22681.22370.0031 1.20743B 1.21101.21761.22681.23080.0040 1.25002A 0.0021 1.31041.2954… 1.22921.22210.0071 1.16162B 1.177 1.202 1.23131.24050.0092 1.31253A 0.0000 1.31251.2975… 1.23131.22600.0053 1.16373B 1.17701.19221.23131.23820.0069 1.31252A 0.0017 1.31081.2994… 1.25671.25090.0058 1.21162B 1.222 1.240 1.25841.26590.0075 1.31253A 0.0000 1.31251.3011… 1.25841.25410.0043 1.21333B 1.22201.23231.25841.26400.0056 1.31252A 0.0015 1.31101.3016… 1.27041.26530.0051 1.23652B 1.245 1.259 1.27191.27850.0066 1.31253A 0.0000 1.31251.3031… 1.27191.26810.00381.23803B1.24501.25331.27191.27690.0050 1.31251-1/4-20/1.250-20UN 1-1/4-28/1.250-28UN 1-5/16-16/1.3125-16UN1-5/16-8/1.3125-8UN 1-5/16-12/1.3125-12UN 1-1/4-12/1.250-12UNF 1-1/4-16/1.250-16UN 1-1/4-18/1.250-18UNEF 1-3/16-28/1.1875-28UN 1-1/4-7/1.250-7UNC 1-1/4-8/1.250-8UN 1-3/16-16/1.1875-16UN1-3/16-18/1.1875-18UNEF 1-3/16-20/1.1875-20UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差倒等級角最小等級2A 0.0015 1.31101.3023… 1.27491.27000.0049 1.24492B 1.252 1.265 1.27641.28270.0063 1.31253A 0.0000 1.31251.3038… 1.27641.27280.0036 1.24643B 1.25201.26051.27641.28110.0047 1.31252A 0.0014 1.31111.3030… 1.27861.27390.0047 1.25162B 1.258 1.270 1.28001.28610.0061 1.31253A 0.0000 1.31251.3044… 1.28001.27650.0035 1.25303B 1.25801.26621.28001.28450.0045 1.31252A 0.0012 1.31131.3048… 1.28811.28400.0041 1.26872B 1.274 1.282 1.28931.29460.0053 1.31253A 0.0000 1.31251.3060… 1.28931.28620.0031 1.26993B 1.27401.28011.28931.29330.0040 1.31251A 0.0024 1.37261.3453… 1.26431.25230.0120 1.17421B 1.195 1.225 1.26671.28220.0155 1.37502A 0.0024 1.37261.35441.34531.26431.25630.0080 1.17422B 1.195 1.225 1.26671.27710.0104 1.37503A 0.0000 1.37501.3568… 1.26671.26070.0060 1.17663B 1.19501.21461.26671.27450.0078 1.37502A 0.0022 1.37281.35781.35031.29161.28440.0072 1.22402B 1.240 1.265 1.29381.30310.0093 1.37503A 0.0000 1.37501.3600… 1.29381.28840.0054 1.22623B 1.24001.25471.29381.30080.0070 1.37501A 0.0019 1.37311.3559… 1.31901.30960.0094 1.27391B 1.285 1.303 1.32091.33320.0123 1.37502A 0.0019 1.37311.3617… 1.31901.31270.0063 1.27392B 1.285 1.303 1.32091.32910.0082 1.37503A 0.0000 1.37501.3636… 1.32091.31620.0047 1.27583B 1.28501.29481.32091.32700.0061 1.37502A 0.0015 1.37351.3641… 1.33291.32780.0051 1.29902B 1.307 1.321 1.33441.34100.0066 1.37503A 0.0000 1.37501.3656… 1.33441.33060.0038 1.30053B 1.30701.31581.33441.33940.0050 1.37502A 0.0015 1.37351.3648… 1.33741.33250.0049 1.30742B 1.315 1.328 1.33891.34520.0063 1.37503A 0.0000 1.37501.3663… 1.33891.33530.0036 1.30893B 1.31501.32301.33891.34360.0047 1.37502A 0.0014 1.37361.3655… 1.34111.33640.0047 1.31412B 1.321 1.332 1.34251.34860.0061 1.37503A 0.0000 1.37501.3669… 1.34251.33900.0035 1.31553B 1.32101.32871.34251.34700.0045 1.37502A 0.0012 1.37381.3673… 1.35061.34650.0041 1.33122B 1.336 1.345 1.35181.35710.0053 1.37503A 0.0000 1.37501.3685… 1.35181.34870.0031 1.33243B 1.33601.34261.35181.35580.0040 1.37502A 0.0024 1.43511.4169… 1.32681.31880.0080 1.23672B 1.257 1.288 1.32921.33960.0104 1.43753A 0.0000 1.43751.4193… 1.32921.32320.0060 1.23913B 1.25701.27711.32921.33700.0078 1.43752A 0.0022 1.43531.4203… 1.35411.34690.0072 1.28652B 1.302 1.327 1.35631.36570.0094 1.43753A 0.0000 1.43751.4225… 1.35631.35090.0054 1.28873B 1.30201.31721.35631.36340.0071 1.43752A 0.0018 1.43571.4243… 1.38161.37570.0059 1.33652B 1.347 1.365 1.38341.39100.0076 1.43753A 0.0000 1.43751.4261… 1.38341.37900.0044 1.33833B 1.34701.35731.38341.38910.0057 1.43752A 0.0016 1.43591.4265… 1.39531.39010.0052 1.36142B 1.370 1.384 1.39691.40370.0068 1.43753A 0.0000 1.43751.4281… 1.39691.39300.00391.36303B1.37001.37831.39691.40200.0051 1.43751-7/16-12/1.4375-12UN 1-7/16-16/1.4375-16UN1-7/16-8/1.4375-8UN 1-3/8-18/1.375-18UNEF 1-3/8-20/1.375-20UN 1-7/16-6/1.4375-6UN 1-3/8-28/1.375-28UN 1-3/8-12/1.375-12UNF 1-3/8-16/1.375-16UN 1-3/8-6/1.375-6UNC 1-3/8-8/1.375-8UN 1-5/16-28/1.3125-28UN 1-5/16-18/1.3125-18UNEF 1-5/16-20/1.3125-20UN。
美制螺纹滚丝规格表
大径极限 中径极限 螺胚直径公称尺寸和每英寸牙数螺纹系列代号最小最大最小最大小径max 最小 最大8-320.1571 0.1631 0.1399 0.1428 0.1248 (0.164-32)3.99034.1427 3.5535 3.6271 3.1699 3.58 3.61 10-240.1818 0.1890 0.1586 0.1619 0.1379 (0.190-24)4.6177 4.8006 4.0284 4.1123 3.5027 4.07 4.10 12-240.2078 0.2150 0.1845 0.1879 0.1639 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.1631 4.72 4.75 1/4-200.2408 0.2489 0.2127 0.2164 0.1876 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.7650 5.45 5.48 5/16-180.3026 0.3113 0.2712 0.2752 0.2431 (0.3175-18)7.6860 7.9070 6.8885 6.9901 6.1747 6.94 6.98 3/8-160.3643 0.3737 0.3287 0.3331 0.2970 (0.375-16)9.2532 9.4920 8.3490 8.4607 7.5438 8.40 8.44 7/16-140.4258 0.4361 0.3850 0.3897 0.3485 (0.4375-14)10.8153 11.0769 9.77909.8984 8.8519 9.83 9.87 1/2-130.4876 0.4985 0.4435 0.4485 0.4041 (0.50-13)12.3850 12.6619 11.2649 11.3919 10.2641 11.34 11.38 9/16-120.5495 0.5609 0.5016 0.5068 0.4587 (0.5625-12)13.9573 14.2469 12.7406 12.8727 11.6510 12.80 12.84 5/8-110.6113 0.6234 0.5589 0.5644 0.5119 (0.625-11)15.5270 15.8344 14.1961 14.3358 13.0023 14.27 14.32 3/4-100.7353 0.7482 0.6773 0.6832 0.6255 (0.750-10)18.6766 19.0043 17.2034 17.3533 15.8877 17.28 17.33 7/8-90.8592 0.8731 0.7946 0.8009 0.7368 (0.875-9)21.8237 22.1767 20.1828 20.3429 18.7147 20.27 20.32 1"-80.9830 0.99800.9100 0.9168 0.8446 (1.000-8)UNC24.9682 25.3492 23.1140 23.2867 21.452823.22 23.271.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制英制公制螺纹孔尺寸表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406-12 26.944 26.655 0.290 24.689 25.146 0.457 6 11/16-12 33.294 33.005 0.290 31.039 31.496 0.457 7 15/168 15/-12 41.229 40.940 0.290 38.989 39.446 0.4578-12 47.579 47.290 0.290 45.339 45.796 0.457 9 17/8-12 63.452 63.162 0.290 61.214 61.671 0.457 10 21/2公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.3000.375 12 M27*2 26.962 26.682 0.280 24.83525.21013 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.640-11 41.910 41.550 0.360 38.952 39.592 0.6407 G11/4-11 47.803 47.443 0.360 44.845 45.485 0.6408 G11/2公制/美制/英制螺纹对照表给大家分享一下 A型美制螺纹（UNF）常用规格牙型角60外螺纹内螺纹 -4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1 -8 13/16''-16 20.64 19.28 -10 1''-14 2 5.40 23.57 -12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)' '-12 42.86 41.02 C型JIC37度美制UNF螺纹常用规格牙型角60-4 7/16”-20 11.11 10.03 -5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 -83/4”-16 19.00 17.68 -10 7/8”-14 22.22 20.68 -12 1(1/16)"-12 26.98 25.15 -16 1 (5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8 -32 2(1/2)"-12 63.5 61.67 英制圆柱管螺纹（BSPP）常用规格牙型角55-4 1/4”-19 13.157 11.55 -6 3/8”-19 16.662 14.95 -8 1/2”-14 20.955 18.63 -12 3/4”-14 26.441 24.11 -16 1”-11 33.249 30.29 -20 1(1/4)''-11 41.91 38.95 英制圆锥管螺纹（BSPT）常用规格牙型角55基面大径基准距离1/4”-19 13.157 6 3/8”-19 16.662 6.4 1/2”-14 20.955 8.2 3/4”-14 26.441 9.5 1”-11 33.249 10.4 1(1/4)''-11 41.91 12.7 美制圆锥管螺纹（NPT）牙型角601/8”-27 10.24 4 1/4”-18 13.60 4 3/8”-18 17.04 4.32 1/2”-14 21.22 4.48 3/4”-14 26.57 4.75 1”-11(1/2)” 33.22 4.6 1(1/4)”-11.5 41.96 4.83螺纹的一般知识第一章国标螺纹的一般知识一. 螺纹的分类1. 螺纹分内螺纹和外螺纹两种；2. 按牙形分可分为：1）三角形螺纹2）梯形螺纹3）矩形螺纹4）锯齿形螺纹；3. 按线数分单头螺纹和多头螺纹；4. 按旋入方向分左旋螺纹和右旋螺纹两种, 右旋不标注，左旋加LH，如M24×1.5LH；5. 按用途不同分有：米制普通螺纹、用螺纹密封的管螺纹、非螺纹密封的管螺纹、60°圆锥管螺纹、米制锥螺纹等二. 米制普通螺纹1. 米制普通螺纹用大写M表示，牙型角2α=60°（α表示牙型半角）；2. 米制普通螺纹按螺距分粗牙普通螺纹和细牙普通螺纹两种；2.1. 粗牙普通螺纹标记一般不标明螺距，如M20表示粗牙螺纹；细牙螺纹标记必须标明螺距，如M30×1.5表示细牙螺纹、其中螺距为1.5。
美制螺纹标准对照表
6.7310
7.0206
7.1552
7.9375
3/8-16
0.3070
0.3210
0.3344
0.3401
0.3750
7.85
8.00
(0.375-16)
7.7978
8.1534
8.4938
8.6385
9.5250
7/16-14
0.3600
0.3760
0.3911
0.3972
0.4375
13.2207
13.3350
12.5197
5/8-18
0.6149
0.6236
0.5828
0.5875
0.5554
14.85
14.89
(0.625-18)
15.6185
15.8394
14.8031
14.9225
14.1072
3/4-16
0.7391
0.7485
0.7029
0.7079
0.6718
17.91
4.9098
5.4864
1/4-20
0.1960
0.2070
0.2175
0.2224
0.2500
5.05
5.20
(0.250-20)
4.9784
5.2578
5.5245
5.6490
6.3500
5/16-18
0.2520
0.2650
0.2764
0.2817
0.31256.45源自6.60(0.3175-18)
8.75
8.78
(0.375-24)
9.3142
9.4971
美制外螺纹常用规格尺寸表
美制内螺纹（2B）常用规格极限尺寸表（细牙）
公称尺寸和每英寸牙数
螺纹系列代号
小径极限
中径极限
大径min
底孔直径
最小
最大
最小
最大
最小
最大
8-36
UNF
0.1340
0.1420
美制外螺纹（2A）常用规格极限尺寸表（粗牙）
公称尺寸和每英寸牙数
螺纹系列代号
大径极限
中径极限
小径max
螺胚直径
最小
最大
最小
UNC
0.1571
0.1631
0.1399
0.1428
0.1248
3.58
3.61
(0.164-32)
3.9903
4.1427
3.5535
3.6271
3.1699
0.1460
0.1496
0.1640
3.45
3.67
(0.164-36)
3.4036
3.6068
3.7084
3.7998
4.1656
10-32
0.1560
0.1640
0.1697
0.1736
0.1900
4.00
4.27
(0.190-32)
3.9624
4.1656
4.3104
4.4094
4.8260
12-28
5/8-18
0.5650
0.5780
0.5889
0.5949
0.6250
14.45
美制螺纹标准
大径极限 中径极限 螺胚直径 公称尺寸和每英寸牙数 螺纹系列代号最小最大最小最大小径max最小最大8-320.15710.16310.13990.14280.1248(0.164-32)3.99034.14273.55353.62713.16993.58 3.61 10-240.18180.18900.15860.16190.1379(0.190-24)4.61774.80064.02844.11233.50274.07 4.10 12-240.20780.21500.18450.18790.1639(0.216-24)5.27815.46104.68634.77274.16314.72 4.75 1/4-200.24080.24890.21270.21640.1876(0.250-20)6.11636.32215.40265.49664.76505.45 5.48 5/16-180.30260.31130.27120.27520.2431(0.3175-18)7.68607.90706.88856.99016.17476.94 6.98 3/8-160.36430.37370.32870.33310.2970(0.375-16)9.25329.49208.34908.46077.54388.40 8.44 7/16-140.4258 0.4361 0.38500.38970.3485(0.4375-14)10.8153 11.07699.77909.89848.85199.83 9.87 1/2-130.4876 0.4985 0.4435 0.4485 0.4041 (0.50-13)12.3850 12.6619 11.2649 11.3919 10.2641 11.34 11.38 9/16-120.5495 0.5609 0.5016 0.5068 0.4587 (0.5625-12)13.9573 14.2469 12.7406 12.8727 11.6510 12.80 12.84 5/8-110.6113 0.6234 0.5589 0.5644 0.5119 (0.625-11)15.5270 15.8344 14.1961 14.3358 13.0023 14.27 14.32 3/4-100.7353 0.7482 0.6773 0.6832 0.6255 (0.750-10)18.6766 19.0043 17.2034 17.3533 15.8877 17.28 17.33 7/8-90.8592 0.8731 0.7946 0.8009 0.7368 (0.875-9)21.8237 22.1767 20.1828 20.3429 18.7147 20.27 20.32 1"-80.98300.99800.91000.91680.8446(1.000-8)UNC24.9682 25.3492 23.1140 23.2867 21.452823.22 23.271.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
美制外螺纹常用规格尺寸表
美制外螺纹（2A）常用规格极限尺寸表（粗牙）
1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-24UNC-2A(或、3/8-16UNC-2A(或
（注：表中上行斜体数值单位为英寸，下行乘为毫米）
美制外螺纹（2A）常用规格极限尺寸表（细牙）
1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-32UNF-2A(或、3/8-24UNF-2A(或
美制内螺纹（2B）常用规格极限尺寸表（粗牙）
1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-24UNC-2B(或、3/8-16UNC-2B(或
美制内螺纹（2B）常用规格极限尺寸表（细牙）
1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-32UNF-2B(或、3/8-24UNF-2B(或。
美制螺纹对照表.xls
螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 1-64UNC640.2360.3972A 1.83896 1.74244 1.58242 1.53162 1.366522B 1.42494 1.58242 1.59766 1.6637 1.8542 1.3973A1.8542 1.75768 1.59766 1.55956 1.381763B 1.42494 1.58242 1.59766 1.64592 1.8542 1.3971-72UNF720.210.3532A 1.83896 1.75006 1.61036 1.5621 1.419862B 1.4732 1.6129 1.6256 1.6891 1.8542 1.51133A1.8542 1.7653 1.6256 1.59004 1.43513B 1.4732 1.6129 1.6256 1.67386 1.8542 1.51132-56UNC560.2710.4542A 2.16916 2.06502 1.87452 1.82118 1.630682B 1.69418 1.87198 1.88976 1.96088 2.1844 1.70183A2.1844 2.08026 1.88976 1.84912 1.645923B 1.69418 1.87198 1.88976 1.9431 2.1844 1.70182-64UNF640.2360.3972A 2.16916 2.07264 1.91262 1.86182 1.696722B 1.75514 1.91262 1.92786 1.99644 2.1844 1.7783A2.1844 2.08788 1.92786 1.88976 1.711963B 1.75514 1.91262 1.92786 1.97866 2.1844 1.7783-48UNC480.3150.5292A 2.49682 2.38252 2.15392 2.0955 1.864362B 1.94056 2.1463 2.1717 2.2479 2.5146 1.99393A2.5146 2.4003 2.1717 2.12852 1.882143B 1.94056 2.1463 2.1717 2.22758 2.5146 1.99393-56UNF560.2710.4542A 2.49682 2.39268 2.20218 2.1463 1.958342B 2.02438 2.1971 2.21996 2.29108 2.5146 2.05743A2.5146 2.41046 2.21996 2.17932 1.976123B 2.02438 2.1971 2.21996 2.2733 2.5146 2.05744-40UNC400.3780.6352A 2.82448 2.69494 2.413 2.3495 2.067562B 2.15646 2.38506 2.43332 2.51714 2.8448 2.18443A2.8448 2.71526 2.43332 2.38506 2.087883B 2.15646 2.38506 2.43332 2.49428 2.8448 2.18444-48UNF480.3150.5292A 2.82702 2.71272 2.48412 2.42316 2.194562B 2.27076 2.45872 2.5019 2.58064 2.8448 2.26063A2.8448 2.7305 2.5019 2.45618 2.212343B 2.27076 2.45872 2.5019 2.56032 2.8448 2.26065-40UNC400.3780.6352A 3.15468 3.02514 2.7432 2.67716 2.397762B 2.48666 2.69748 2.76352 2.84734 3.175 2.52733A3.175 3.04546 2.76352 2.71526 2.418083B 2.48666 2.69748 2.76352 2.82702 3.175 2.52735-44UNF440.3440.5772A 3.15722 3.0353 2.7813 2.7178 2.468882B 2.55016 2.74066 2.79908 2.88036 3.175 2.57813A3.175 3.05308 2.79908 2.75082 2.486663B 2.55016 2.74066 2.54508 2.86004 3.175 2.57816-32UNC320.4720.7942A 3.48488 3.33248 2.96926 2.89814 2.542B 2.6416 2.8956 2.98958 3.08356 3.5052 2.70513A3.5052 3.3528 2.98958 2.93624 2.560323B 2.6416 2.8956 2.98958 3.05816 3.5052 2.70516-40UNF400.3780.6352A 3.48488 3.35534 3.0734 3.00736 2.727962B 2.8194 3.0226 3.09372 3.18008 3.5052 2.87023A3.50523.375663.093723.042922.748283B2.81943.012443.093723.157223.50522.8702公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径0.073（#1）1.8540.086(#2)2.1840.099(3#)2.515螺纹中经公差代号螺纹小径螺纹中径0.112(#4)2.8450.125(#5)3.1750.138(#6）3.505螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径8-32UNC320.4720.7842A 4.14274 3.99034 3.62712 3.55346 3.197862B 3.302 3.5306 3.64998 3.7465 4.1656 3.45443A4.1656 4.0132 3.64998 3.5941 3.220723B 3.302 3.52806 3.64998 3.7211 4.1656 3.45448-36UNF360.4210.7062A 4.14528 4.00558 3.68808 3.61696 3.304542B 3.4036 3.6068 3.7084 3.79984 4.1656 3.45443A4.1656 4.0259 3.7084 3.65506 3.324863B 3.4036 3.59664 3.7084 3.77698 4.1656 3.454410-24UNC240.631.0582A 4.8006 4.61772 4.11226 4.02844 3.540762B 3.683 3.9624 4.13766 4.24688 4.826 3.73383A4.826 4.64312 4.13766 4.07416 3.566163B 3.683 3.9497 4.13766 4.21894 4.826 3.733810-28UNS 280.540.9072A 4.8006 4.6355 4.21132 4.1275 3.718562B 3.8354 4.064 4.23672 4.34594 4.826 3.860810-32UNF320.4720.7842A 4.80314 4.65074 4.28752 4.21132 3.858262B 3.9624 4.1656 4.31038 4.40944 4.826 3.98783A 4.826 4.6736 4.31038 4.25196 3.881123B 3.9624 4.16814 4.31038 4.38404 4.826 3.987810-36UNS 360.4210.7062A 4.80314 4.66344 4.34594 4.26974 3.96242B 4.064 4.2164 4.3688 4.46786 4.826 4.038610-40UNS 400.3780.6352A 4.80314 4.6736 4.39166 4.318 4.043682B 4.1402 4.2926 4.41452 4.5085 4.826 4.089410-48UNS 480.3150.5292A 4.80568 4.69138 4.46278 4.39674 4.175762B 4.2418 4.3688 4.4831 4.56946 4.826 4.216410-56UNS 560.2710.4542A 4.80822 4.70408 4.51358 4.45008 4.269742B 4.3434 4.445 4.53136 4.61264 4.826 4.305312-24UNC240.631.0582A 5.461 5.27812 4.77266 4.6863 4.201162B 4.3434 4.5974 4.79806 4.90982 5.4864 4.49583A5.4864 5.30352 4.79806 4.73202 4.226563B 4.3434 4.58978 4.79806 4.88188 5.4864 4.495812-28UNF280.540.9072A 5.461 5.2959 4.87172 4.79044 4.378962B 4.4958 4.7244 4.89712 5.0038 5.4864 4.5723A5.4864 5.3213 4.89712 4.83616 4.404363B 4.4958 4.71678 4.89712 4.97586 5.4864 4.57212-32UNEF320.4720.7842A 5.46354 5.31114 4.94792 4.86918 4.518662B 4.6228 4.826 4.97078 5.07492 5.4864 4.5723A5.4864 5.334 4.97078 4.90982 4.541523B 4.6228 4.8133 4.97078 5.04952 5.4864 4.57212-36UNS 360.4210.7062A 5.46354 5.32384 5.00634 4.93014 4.879342B 4.7244 4.8768 5.0292 5.12826 5.4864 4.800612-40UNS 400.3780.6352A 5.46354 5.334 5.05206 4.9784 4.66092B 4.8006 4.953 5.07492 5.1689 5.4864 4.851412-48UNS 480.3150.5292A 5.46608 5.35178 5.12318 5.05714 4.836162B 4.9022 5.0292 5.1435 5.22986 5.4864 4.978412-56UNS560.2710.4542A5.468625.364485.173985.110484.930142B5.00385.10545.191765.273045.48644.97840.164（#8）4.1660.19（#10）4.8260.216（#12）0.486螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/4-20UNC200.7561.271A 6.32206 6.01218 5.49656 5.35432 4.810761B 4.9784 5.2578 5.5245 5.70992 6.35 5.10542A 6.32206 6.11632 5.49656 5.40258 4.810762B 4.9784 5.2578 5.5245 5.64896 6.35 5.10543A6.35 6.14426 5.5245 5.45338 4.83873B 4.9784 5.25018 5.5245 5.61594 6.35 5.10541/4-24UNS 240.63 1.0582A 6.32206 6.13918 5.63372 5.53974 5.062222B 5.207 5.461 5.66166 5.78358 6.35 5.30861/4-27UNS 270.560.9412A 6.3246 6.15442 5.71246 5.62356 5.204462B 5.334 5.5626 5.73786 5.85216 6.35 5.41021/4-28UNF280.540.9071A 6.3246 6.07568 5.73532 5.60832 5.242561B 5.3594 5.588 5.76072 5.92582 6.35 5.41022A 6.3246 6.1595 5.73532 5.6515 5.242562B 5.3594 5.588 6.82752 5.86994 6.35 5.41023A 6.35 6.1849 5.76072 5.69722 5.267963B 5.3594 5.5626 6.82752 5.842 6.35 5.41021/4-32UNEF320.4720.7842A 6.3246 6.1722 5.80898 5.7277 5.379722B 5.4864 5.6896 5.83438 5.94106 6.35 5.554983A6.35 5.6896 5.83438 5.77342 5.405123B 5.4864 5.66166 5.83438 5.91312 6.35 5.554981/4-36UNS 360.4210.7062A 6.32714 6.18744 5.86994 5.7912 5.488942B 5.588 5.7404 5.8928 5.9944 6.35 5.61341/4-40UNS 400.3780.6352A 6.32714 6.1976 5.91566 5.842 5.570222B 5.6642 5.8166 5.93852 6.03504 6.35 5.79121/4-48UNS 480.3150.5292A 6.32968 6.21538 5.98678 5.9182 5.697222B 5.7658 5.8928 6.0071 6.09854 6.35 5.79121/4-56UNS 560.2710.5452A 6.32968 6.22554 6.03504 5.969 5.79122B 5.8674 5.969 6.05536 6.13918 6.35 5.94365/16-18UNC180.8411.4111A 7.907027.57428 6.99008 6.83514 6.228081B 6.4008 6.7317.020567.221227.9375 6.52782A 7.907027.68604 6.99008 6.88848 6.228082B 6.4008 6.7317.020567.155187.9375 6.52783A7.93757.716527.02056 6.94436 6.258563B 6.4008 6.68027.020567.119627.9375 6.52785/16-20UN200.7561.272A 7.907027.701287.08152 6.97992 6.395722B 6.5532 6.8587.1127.244087.9375 6.746243A7.93757.731767.1127.0358 6.42623B 6.5532 6.80727.1127.211067.9375 6.746245/16-24240.631.0581A 79095.67.635247.221227.08152 6.649721B 6.78187.03587.249167.42957.9375 6.90882A7.909567.726687.221227.12724 6.649722B 6.78187.03587.249167.371087.9375 6.90883A7.93757.754627.249167.18058 6.677663B 6.7818 6.995167.249167.34067.9375 6.90885/8-27UNS 270.560.9412A 7.91217.741927.299967.21106 6.791962B 6.90887.13747.249167.439667.93757.03585/8-28UN280.540.9072A7.91217.7477.322827.236466.830062B6.95967.16287.348227.459987.93757.03580.25"6.350.3125"7.9375螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A7.93757.77247.348227.28218 6.855463B 6.95967.129787.348227.432047.93757.03585/8-32UNEF320.4720.7842A 7.91217.75977.31527.3152 6.967222B 7.08667.26447.421887.528567.93757.142483A7.93757.78517.360927.36092 6.992623B 7.08667.231387.421887.500627.93757.142485/8-36UNS 360.4210.7062A 7.914647.774947.45744 5.32137.07392B 7.16287.34067.48037.58197.93757.142485/8-40UNS 400.3780.6352A 7.914647.78517.503167.42957.157722B 7.2397.39147.526027.622547.93757.3665/8-48UNS 40.3120.3150.5292A 7.917187.802887.574287.50577.287262B 7.3667.4937.59467.686047.93757.3663/8-16UNC180.8411.4111A 9.491989.13138.460748.295647.599681B 7.79788.15348.493768.709669.5257.93752A 9.491989.253228.460748.348987.599682B 7.79788.15348.493768.638549.5257.93753A9.5259.286248.493768.409947.63273B 7.79788.082288.493768.602989.5257.93753/8-18UNS 180.841 1.4112A 9.491989.2718.575048.465827.813042B 8.0018.33128.608068.75039.5258.02643/8-20UN200.7561.272A 9.494529.288788.669028.564887.983222B 8.15348.43288.69958.836669.5258.333743A9.5259.319268.69958.620768.01373B 8.15348.374388.69958.69959.5258.333743/8-24UNF240.631.0581A 9.497069.222748.808728.663948.237221B 8.3828.6368.836668.836669.5258.43282A 9.497069.314188.808728.71228.237222B 8.3828.6368.836668.961129.5258.43283A 9.5259.342128.836668.7638.265163B 8.3829.44888.836668.5130649.5258.43283/8-27UNS 270.560.9412A 9.497069.326888.884928.793488.376922B 8.5098.73768.912869.032249.5258.61063/8-28UN280.540.9072A 9.497069.331968.907788.816348.415022B 8.53448.7638.935729.052569.5258.61063A9.5259.35998.935728.867148.442963B 8.53448.702048.935729.024629.5258.61063/8-32UNEF320.4720.7842A 8.569969.34728.983988.897628.554722B 8.66148.86469.009389.121149.5258.83923A9.5259.37269.009388.945888.580123B 8.66148.811269.009389.09329.5258.83923/8-36UNS 360.4210.7062A 9.49969.35999.04248.961128.658862B 8.7638.94089.06789.174489.5258.83923/8-40UNC400.3780.6352A 9.502149.37269.090669.011928.745222B 8.83928.99169.113529.215129.5258.83920.39" 9.9060.390-27UNS270.560.9412A9.878069.707889.265929.174488.757922B8.899.11869.293869.413249.9068.83920.325"8.255螺纹小径螺纹外径MaxMinMax Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径7/16-14UNC141.0811.8141A 11.0769410.683249.898389.718048.917941B 9.1449.55049.9339410.1676211.11259.34722A 11.0769410.815329.898389.7798.917942B 9.1449.55049.9339410.0888811.11259.34723A11.112510.850889.933949.845048.95353B 9.1449.441189.9339410.0507811.11259.34727/16-16UNS160.861.5882A 11.0769410.8381810.04579.928869.184642B 9.3989.753610.0812610.2311211.11259.57583A11.0667810.8737410.081269.99499.22023B 9.3989.65210.0812610.1955611.11259.57587/16-18UNS 180.841 1.4112A 11.0794810.858510.1625410.053329.400542B 9.57589.90610.1955610.337811.11259.80447/16-20UNF200.7561.271A 11.0794810.769610.9397810.09659.568181B 9.728210.03310.28710.4927411.066789.921242A 11.0794810.8737410.9397810.14739.568182B 9.728210.03310.28710.4241611.066789.921243A11.112510.9067610.312410.208269.60123B 9.72829.9466410.28710.3911411.066789.921247/16-24UNS 240.63 1.0582A 11.0845610.9016810.3962210.29979.824722B 9.956810.210810.4241610.5486211.0667810.08387/16-27UNS 270.560.9412A 11.0845610.9143810.4724210.380989.964422B 10.083810.312410.5003610.6197411.112510.26167/16-28UNEF280.540.9072A 11.0845610.9194610.4952810.4038410.002522B 10.134610.337810.5232210.6400611.112510.26163A11.112510.94748.67232210.4546410.030463B 10.134611.4579410.5232210.6121211.112510.26167/16-32UN320.4720.7842A 11.087110.934710.5714810.4851210.142222B 10.261610.439410.5968810.7086411.112510.26163A11.112510.960110.5968810.5333810.167623B 10.261610.3987610.5968810.680711.112510.26161/2-13UNC131.1631.9541A 12.661912.2478811.391911.2039410.259061B 10.591811.023611.4311.6763812.710.716262A 12.661912.3850411.391911.264910.335262B 10.591811.023611.4311.595112.710.716263A12.712.4231411.4311.3360210.373363B 10.591810.8813611.4311.5519212.710.716261/2-12UNS121.262.1172A 12.6593612.369811.2852211.1480610.139682B 10.41410.871211.3258611.5036612.710.716263A12.712.4104411.3258611.2242610.180323B 10.41410.7264211.3258611.4579412.710.716261/2-14UNS 14 1.081 1.8142A 12.661912.4002811.4833411.3563410.50292B 10.744211.125211.5214411.6865412.710.716261/2-16UNS160.861.5882A 12.6644412.4256811.633211.5138210.772142B 10.972811.328411.6687611.823712.711.11253A13.20812.4612411.6687611.5798610.80773B 10.972811.2242611.6687611.785612.711.11251/2-18UNS180.8411.4112A12.6669812.44611.7500411.6382810.988042B11.17611.506211.7830611.9303812.711.11250.4375"11.110.5"螺纹小径螺纹外径MaxMin MaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/2-20UNF200.7561.271A 12.6669812.357111.8414811.6789212.527281B 11.328411.607811.874512.0878612.711.508742A 12.6669812.4612411.8414811.7322612.527282B 11.328411.607811.874512.0167412.711.508743A12.712.4942611.874511.7932211.191243B 11.328411.5239811.874511.9811812.711.508741/2-24UNS 240.63 1.0582A 12.6695212.4866411.9811811.8821211.409682B 11.55711.81112.0116612.141212.711.508741/2-27UNS 270.560.9412A 12.6720612.5018812.0599211.9659411.551922B 11.68411.912612.0878612.2097812.711.904981/2-28UNEF280.540.9072A 12.6720612.5069612.0827811.988811.590022B 11.709411.93811.93812.2326412.711.904983A12.712.534912.1107212.039611.617963B 11.709411.8770412.1107212.2021612.711.904981/2-32UN320.4720.7842A 12.674612.522212.1589812.0700811.729722B 11.836412.039612.1843812.2986812.711.904983A12.712.547612.1843812.1183411.755123B 11.836411.9862612.1843812.2707412.711.904989/16-12UNC121.262.1171A 14.2468613.8099812.8727212.674611.727181B 11.988812.44612.9133613.1724414.287512.303762A 14.2468613.957312.8727212.7406411.727182B 11.988812.44612.9133614.00860814.287512.303763A14.287513.9979412.9133612.814311.767823B 11.988812.3012212.9133613.0454414.287512.303769/16-14UNS 14 1.081 1.8142A 14.249413.9877813.0708412.9438412.09042B 12.31912.725413.1089413.2740414.287512.303769/16-16UN160.861.5882A 14.2519414.0131813.220713.1013212.359642B 12.57312.928613.2562613.411214.287512.73A14.287514.0487413.2562613.1673612.39523B 12.57312.801613.2562613.373114.287512.79/16-18UNF180.8411.4111A 14.2519413.919213.33513.1622812.5731B 12.750813.08113.3705613.5966214.287513.096242A14.25981414.0309613.33513.220712.5732B 12.750813.08113.3705613.5204214.287513.096243A14.287514.0665213.3705613.284212.608563B 12.750812.9692413.3705613.4823214.287513.096249/16-20UN200.7561.272A 14.2544814.0487413.4289813.322312.743182B 12.903213.20813.46213.601714.287513.096243A14.287514.0817613.46213.3807212.77623B 12.903213.1114813.46213.5661414.287513.096249/16-24UNEF240.631.0582A 14.2570214.0741413.5686813.4696212.997182B 13.131813.385813.5991613.728714.287513.096243A14.287514.1046213.5991613.525513.027663B 13.131813.3197613.5991613.6956814.287513.096249/16-27UNS 270.560.9412A 14.2595614.0893813.6474213.5534413.139422B 13.258813.487413.6753613.7972814.287513.492489/16-28UN280.540.9072A14.2595614.0944613.6702813.576313.177522B13.309613.512813.6982213.8201414.287513.4924812.70.5625"14.288螺纹小径螺纹外径MaxMin Max Min Max Min MaxMinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A14.287514.122413.6982213.627113.205463B 13.309613.4645413.6982213.7896614.287513.492489/16-32UN320.4720.7842A 14.262114.109713.7464813.6575813.317222B 13.436613.614413.7718813.8861814.287513.492483A14.287514.135113.7718813.7058413.342623B 13.436613.5737613.7718813.8582414.287513.492485/8-11UNC111.3752.3091A 15.8343615.3720814.3357614.1249413.086081B 13.385813.868414.376414.6481815.87513.492482A 15.8343615.5270214.3357614.1960613.086082B 13.385813.868414.376414.5592815.87513.492483A15.87515.5676614.376414.2722613.126723B 13.385813.6931414.376414.5135615.87513.492485/8-12UN121.262.1172A 15.8343615.544814.4602214.3230613.314682B 13.58914.046214.5008614.681215.87513.891263A15.87515.5854414.5008614.3967213.355323B 13.58913.8760214.5008614.6354815.87513.891265/8-14UNS 14 1.081 1.8142A 15.836915.5752814.6583414.528813.67792B 13.919214.325614.6964414.86458815.87513.891265/8-16UN160.861.5882A 15.8394415.6006814.808214.6862813.947142B 14.147814.503414.8437615.0012415.87514.28753A15.87515.6362414.8437614.7523213.98273B 14.147814.3814814.8437614.960615.87514.28755/8-18UNF180.8411.4111A 15.8394415.506714.922514.744714.16051B 14.35114.681214.9580615.189215.87514.683742A 15.8394415.6184614.922514.8031214.16052B 14.35114.681214.9580615.1104615.87514.683743A 15.87515.6032214.9580614.8691614.196063B 14.35114.554214.9580615.0723615.87514.683745/8-16UN200.7561.272A 15.8419815.6362415.0164814.9072614.330682B 14.503414.782815.049515.1917415.87514.683743A15.87515.6692615.049514.9682214.36373B 14.503414.6989815.049515.1561815.87514.683745/8-24UNEF240.631.0582A 15.8445215.6616415.1561815.0545814.584682B 14.73214.98615.1866615.3187415.87514.683743A15.87515.6921215.1866615.1104614.615163B 14.73214.9072615.1866615.2857215.87514.683745/8-27UNS 270.560.9412A 15.8470615.6768815.2349215.138414.726922B 14.85915.087615.2628615.3898615.87515.079985/8-28UN280.540.9072A 15.8470615.6819615.2577815.1612614.765022B 14.884415.11315.2857215.4101815.87515.079983A15.87515.709915.2857215.214614.792963B 14.884415.0520415.2857215.379715.87515.079985/8-32UN320.4720.7842A 15.8470615.6946615.3314415.2414.902182B 15.011415.214615.3593815.4762215.87515.079983A15.87515.722615.3593815.290814.930123B 15.011415.1612615.3593815.4482815.87515.0799811/16-12UN121.262.1172A17.4218617.132316.0477215.9105614.902182B15.163815.62116.0883616.268717.462515.476220.625"15.875螺纹小径螺纹外径MaxMinMaxMinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A17.462517.1729416.0883615.9842214.942823B 15.163815.455916.0883616.2229817.462515.4762211/16-16UN160.861.5882A 17.4269417.1881816.395716.2737815.534642B 15.74816.103616.4312616.5887417.462515.8753A17.462517.2237416.4312616.3398215.57023B 15.74815.9613616.4312616.548117.4625 1.587511/16-20UN200.7561.272A 17.4294817.2237416.6039816.4947615.918182B 16.078216.38316.63716.7792417.462516.271243A17.462517.2567616.63716.5557215.95123B 16.078216.2864816.63716.7436817.462516.2712411/16-24UNEF240.631.0582A 17.4320217.2491416.7436816.6420816.172182B 16.306816.560816.4947616.9062417.462516.271243A9.842517.2796216.7741616.6979616.30683B 16.306816.4947616.7741616.8732217.462516.2712411/16-28UN280.540.9072A 17.4345617.2694616.8452816.7487616.48462B 16.484616.687816.8732216.9976817.462516.667483A17.462517.297416.8732216.802116.48463B 16.484616.6395416.8732216.967217.462516.6674811/16-32UN320.4720.7942A 17.4345617.2821616.9189416.827516.489682B 16.611616.789416.9468817.0637217.462516.667483A17.462517.310116.9468816.878316.517623B 16.611616.7487616.9468817.0357817.462516.667483/4-10UNC101.5132.541A 19.0042818.5115217.3532817.1297615.979141B 16.306816.840217.39917.691119.0516.667482A 19.0042818.6766217.3532817.2034215.979142B 16.306816.840217.39917.5945819.0516.667483A19.0518.7223417.39917.2872416.024863B 16.306816.624317.39917.5437819.0516.667483/4-12UN121.262.1172A 19.0068218.7172617.6326817.4929816.487142B 16.76417.221217.6758617.8587419.0517.066263A19.0518.7604417.6758617.5717216.530323B 16.76417.0357817.6758617.8130219.0517.066263/4-14UNS 14 1.081 1.8142A 19.011918.7502817.8333417.703816.59892B 17.094217.475217.8714418.0416219.0517.066263/4-16UNF160.861.5881A 19.011918.6512217.9806617.7901617.11961B 17.322817.678418.0187618.2676819.0517.46252A19.011918.7731417.9806617.8536617.11962B 17.322817.678418.0187618.1838619.0517.46253A19.0518.8112418.0187617.9222417.15773B 17.322817.5463218.0187618.1432219.0517.46253/4-18UNS 180.841 1.4112A 19.0144418.7934618.326117.9806617.33552B 17.52617.856218.1330618.2854619.0517.46253/4-20UNEF200.7561.272A 19.0169818.8112418.1914818.0797217.505682B 17.678417.957818.224518.3692819.0517.858743A19.0518.8442618.224518.1406817.53873B 17.678417.8739818.224518.3337219.0517.858743/4-24UNEF240.631.0582A19.0195218.8366418.3311818.2270417.759682B17.90718.16118.3616618.4962819.0517.858740.6875"17.4630.75"19.05螺纹小径螺纹外径MaxMinMaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A19.0195218.8493418.4073818.3083217.899383B 18.03418.262618.4378618.567419.0517.858743/4-28UN280.540.9072A 19.0195218.8544218.4302418.3337217.937482B 18.059418.28818.4607218.5877219.0518.254983A19.0518.884918.4607218.3870617.967963B 18.059418.2270418.4607218.554719.0518.254983/4-32UN320.4720.7842A 19.0220618.8696618.5064418.41518.077182B 18.186418.389618.5343818.6537619.0518.254983A19.0518.897618.5343818.465818.105123B 18.186418.3362618.5343818.6258219.0518.2549813/16-10UNC101.5132.542A 20.5917820.2641218.986518.8366417.612362B 17.894318.427718.986519.278620.637518.254983A20.637520.3098419.0322218.9204617.520923B 17.894318.427718.986519.1820820.637518.2549813/16-12UN121.262.1172A 20.5943220.3047619.2201819.0804818.201642B 18.338818.79619.2633619.4462420.637518.653763A20.637520.3479419.2633619.1592218.117823B 18.338818.6156619.2633619.4005220.637518.6537613/16-16UN160.861.5882A 20.599420.3606419.5681619.443718.70712B 18.92319.278619.6062619.7662820.637519.053A20.637520.3987419.6062619.5148218.74523B 18.92319.1338219.6062619.7256420.637519.0513/16-20UNEF200.7561.272A 20.6044820.3987419.7789819.6672219.093182B 19.253219.55819.81219.9567820.637519.446243A20.637520.4317619.81219.7281819.12623B 19.253219.4614819.81219.9212220.637519.4462413/16-28UN280.540.9072A 20.6070220.4419220.0177419.9212219.524982B 19.659619.862820.0482220.1752220.637519.842483A20.637520.421620.0482219.9745619.555463B 19.659619.8145420.0482220.142220.637519.8424813/16-32UN320.4720.7842A 20.6095620.4571620.0939420.002519.664682B 19.786619.964420.1218820.2412620.637519.842483A20.637520.485120.1218820.053319.692623B 19.786619.9237620.1218820.2133220.637519.842487/8-9UNC91.682.8221A 22.1767421.6484220.3428620.1015618.816321B 19.17719.761220.8483220.7035422.22519.446242A 22.1767421.8236820.3428620.1828418.816322B 19.17719.761220.8483220.599422.22519.446243A22.22521.8719420.3911220.2717418.864583B 19.17719.5097420.8483220.5460622.22519.446247/8-10UNS 10 1.513 2.542A 22.1792821.8516220.5282820.3758819.156682B 19.481820.015220.57420.7721222.22519.842487/8-12UN121.262.1172A 22.1818221.8922620.8076820.6679819.662142B 19.93920.396220.8508621.0337422.22520.241263A22.22521.9354420.8508620.7467219.705323B 19.93920.1879220.8508620.9880222.22520.241267/8-14UNF141.0811.8141A22.1843621.7906621.005820.8000620.025361B20.269220.675621.0464421.3156822.22520.63750.8125"20.638螺纹小径螺纹外径MaxMinMax MinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径2A 22.1843621.9227421.005820.8686420.025362B 20.269220.675621.0464421.2242422.22520.63753A22.22521.9633821.0464420.942320.0663B 20.269220.4927221.0464421.1810622.22520.63757/8-16UN160.861.5882A 22.186921.9481421.1556621.031220.0662B 20.497820.853421.1937621.3537822.22520.63753A22.22521.9862421.1937621.1023220.33273B 20.497820.7213221.1937621.3131422.22520.63757/8-18UNS 180.841 1.4112A 22.1894421.9684621.272521.1556620.51052B 20.70121.031221.3080621.4604622.22521.033747/8-20UNEF200.7561.272A 22.1919821.9862421.3664821.2547220.680682B 20.853421.132821.399521.5442822.22521.033743A22.22522.0192621.399521.3156820.71373B 20.853421.0489821.399521.5087222.22521.033747/8-24UNS 240.63 1.0582A 22.1945222.0116421.5061821.4020420.934682B 21.08221.33621.5366621.6712822.22521.033747/8-27UNS 270.560.9412A 22.1945222.0243421.5823821.4833221.074382B 21.20921.437621.6128621.742422.22521.429987/8-28UN280.540.9072A 22.1945222.0294221.6052421.5087221.112482B 21.234421.46321.6357221.7627222.22521.429983A22.22522.059921.6357221.5620621.142963B 21.234421.4020421.6357221.729722.22521.429987/8-32UN320.4720.7842A 22.1970622.0446621.6814421.5921.252182B 21.361421.564621.7093821.8287622.22521.429983A22.22522.072621.7093821.640821.280123B 21.361421.5112621.7093821.8008222.22521.4299815/16-9UNC91.682.8222A 23.7693223.4162621.9354421.7754220.40892B 22.136121.348721.9786222.186923.812521.033743A23.812523.4594421.9786221.8592420.452083B 22.136121.0972421.9786222.1335623.812521.0337415/16-12UN121.262.1172A 23.7693223.4797622.3951822.250421.249642B 21.513821.97122.4383622.6263223.812521.828763A23.812523.5229422.4383622.3342221.292823B 21.513821.780522.4383622.5780623.812521.8287615/16-16UN160.861.5882A 23.774423.5356422.7431622.6161621.88212B 22.09822.453622.7812622.9463623.812524.7653A23.812523.5737422.7812622.6872821.92023B 22.09822.3088222.7812622.9057223.812522.22515/16-20UNEF200.7561.272A 23.7769423.571222.9514422.8371422.265642B 22.428222.73322.98723.1368623.812522.2253A23.812523.6067622.98722.9006422.30123B 22.428222.6364822.98723.0987623.812522.22515/16-28UN280.540.9072A 23.7820223.6169223.1927423.0911422.699982B 22.834623.037823.2232223.355323.812523.017483A23.812523.647423.2232223.1470222.730463B 22.834622.9895423.2232223.3222823.812523.0174815/16-32UN320.4720.7842A23.7845623.6321623.2689423.1724222.839682B22.961623.139423.2968823.4213423.812523.017480.875"22.2250.9375"23.813。
美制螺纹尺寸对照表
美制螺纹尺寸对照表最小最大最小最大8-320.15710.16310.13990.14280.1248(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.1699 10-240.18180.1890.15860.16190.1379(0.190-24) 4.6177 4.8006 4.0284 4.1123 3.5027 12-240.20780.2150.18450.18790.1639(0.216-24) 5.2781 5.461 4.6863 4.7727 4.1631 1/4-200.24080.24890.21270.21640.1876(0.250-20) 6.1163 6.3221 5.4026 5.4966 4.765 5/16-180.30260.31130.27120.27520.2431(0.3175-18)7.6867.9076.8885 6.9901 6.1747 3/8-160.36430.37370.32870.33310.297(0.375-16)9.25329.4928.3498.46077.5438 7/16-140.42580.43610.3850.38970.3485(0.4375-14)10.815311.07699.7799.89848.8519 1/2-130.48760.49850.44350.44850.4041(0.50-13)12.38512.661911.264911.391910.26419/16-120.54950.56090.50160.50680.4587(0.5625-12)13.957314.246912.740612.872711.651 5/8-110.61130.62340.55890.56440.5119(0.625-11)15.52715.834414.196114.335813.0023 3/4-100.73530.74820.67730.68320.6255(0.750-10)18.676619.004317.203417.353315.8877 7/8-90.85920.87310.79460.80090.7368(0.875-9)21.823722.176720.182820.342918.71471"-80.9830.9980.910.91680.8446(1.000-8)24.968225.349223.11423.286721.4528最小最大最小最大8-360.15770.16320.14240.14520.1291(0.164-36) 4.0056 4.1453 3.617 3.6881 3.2791 10-320.18310.18910.16580.16880.1508(0.190-32) 4.6507 4.8031 4.2113 4.2875 3.8303 12-280.20850.2150.18860.19180.1712美制外螺纹（2A）常用规格极限尺寸表（粗牙）公称尺寸和每英寸牙数螺纹系列代号大径极限中径极限小径max 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
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美制螺纹尺寸表(mm)
美制螺纹尺寸表（mm）
1. 引言
螺纹是机械连接中常见的连接形式，具有良好的承力性能和可重复使用性。
在制造过程中，精确的螺纹尺寸是非常重要的，以确保螺纹零件的互换性和相互配合性。
本文将介绍美制螺纹尺寸表（mm）中常见的螺纹类型及其规格。
2. UNC螺纹尺寸表(mm)
UNC（Unified Coarse Thread）螺纹是一种粗牙螺纹，常用于一般机械制造和装配。
以下是UNC螺纹常见尺寸表(mm)的部分内容：- 1/4-20：意味着螺纹直径为1/4英寸，每英寸有20条螺纹
- 5/16-18：意味着螺纹直径为5/16英寸，每英寸有18条螺纹
- 3/8-16：意味着螺纹直径为3/8英寸，每英寸有16条螺纹
UNC螺纹尺寸表中还包括更多的螺纹规格，根据具体的需求可以进行选择。
3. UNF螺纹尺寸表(mm)
UNF（Unified Fine Thread）螺纹是一种细牙螺纹，常用于对连接强度和紧固力有较高要求的场合。
以下是UNF螺纹常见尺寸表(mm)的部分内容：
- 1/4-28：意味着螺纹直径为1/4英寸，每英寸有28条螺纹
- 5/16-24：意味着螺纹直径为5/16英寸，每英寸有24条螺纹
- 3/8-24：意味着螺纹直径为3/8英寸，每英寸有24条螺纹
UNF螺纹尺寸表中也有其他规格的螺纹，可根据具体需求选用。
4. UNEF螺纹尺寸表(mm)
UNEF（Unified Extra Fine Thread）螺纹是一种超细牙螺纹，常用于
对紧固性能要求极高的场合。
以下是UNEF螺纹常见尺寸表(mm)的部
分内容：
- 1/4-32：意味着螺纹直径为1/4英寸，每英寸有32条螺纹
- 5/16-36：意味着螺纹直径为5/16英寸，每英寸有36条螺纹
- 3/8-40：意味着螺纹直径为3/8英寸，每英寸有40条螺纹
UNE F螺纹尺寸表可供选择的规格较少，但在某些特殊应用场合中
仍然发挥着重要作用。
5. 总结
美制螺纹尺寸表（mm）是机械制造中常用的螺纹连接标准。
UNC
螺纹常用于一般机械制造和装配，提供较好的互换性；UNF螺纹适用
于对连接强度和紧固力要求较高的场合；而UNEF螺纹则在需求超细
牙螺纹的情况下使用。
根据具体需求，我们可以选择合适的螺纹规格，以确保螺纹零件的连接性能和质量。
以上是美制螺纹尺寸表(mm)的简要介绍，希望对读者有所帮助。
对于具体的螺纹尺寸需求，还需参考相关标准和规范，以确保螺纹连接的精确度和稳定性。