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1、美美制制螺螺纹纹标标准准大大全全外螺纹 External内螺纹 InternalNominalSine,Threads perInch,and SeriesDesignation级别Class公差Allowance大径Major Diameter中径Pitch Diameter小径UNRMinorDiam.aMax(Ref.)级别ClassMaxb Min MindMaxh Min0-80 UNF2A0.00050.0595 0.05630.05140.04960.04462B3A00.060.05680.05190.05060.04513B1-64 UNC2A0.00060.07240.06
2、860.06230.06030.05382B3A00.0730.06920.06290.06140.05443B1-72 UNF2A0.00060.07240.06890.06340.06150.05592B3A00.0730.06950.0640.06260.05653B2-56 UNC2A0.00060.08540.08130.07380.07170.06422B3A00.0860.08190.07440.07280.06483B2-64 UNF2A0.00060.08540.08160.07530.07330.06682B3A00.0860.08220.07590.07440.06743
3、B3-48 UNC2A0.00070.09830.09380.08480.08250.07342B3A00.0990.09450.08550.08380.07413B3-56 UNF2A0.00070.09830.09420.08670.08450.07712B3A00.0990.09490.08740.08580.07783B4-40 UNC2A0.00080.11120.10610.0950.09250.08142B3A00.1120.10690.09580.09390.08223B4-48 UNF2A0.00070.11130.10680.09780.09540.08642B3A00.1
4、120.10750.09850.09670.08713B5-40 UNC2A0.00080.12420.11910.1080.10540.09442B3A00.1250.11990.10880.10690.09523B5-44 UNF2A0.00070.12430.11950.10950.1070.09722B3A00.1250.12020.11020.10830.09793B6-32 UNC2A0.00080.13720.13120.11690.11410.12B3A00.1380.1320.11770.11560.10083B6-40 UNF2A0.00080.13720.13210.12
5、10.11840.10742B3A00.1380.13290.12180.11980.10823B8-32 UNC2A0.00090.16310.15710.14280.13990.12592B3A00.1640.1580.14370.14150.12683B8-36 UNF2A0.00080.16320.15770.14520.14240.13012B3A00.1640.15850.1460.14390.13093B10-24 UNC2A0.0010.1890.18180.16190.15860.13942B3A00.190.18280.16290.16040.14043B10-28 UNS
6、2A0.0010.1890.18250.16580.16250.14642B10-32 UNF2A0.00090.18910.18310.16880.16580.15192B3A00.190.1840.16970.16740.15283B10-36 UNS2A0.00090.18910.18360.17110.16810.1562B10-40 UNS2A0.00090.18910.1840.17290.170.15922B10-48 UNS2A0.00080.18920.18470.17570.17310.16442B10-56 UNS2A0.00070.18930.18520.17770.1
7、7520.16812B第 1 页，共 8 页2023/2/2312-24 UNC2A0.0010.2150.20780.18790.18450.16542B3A00.2160.20880.18890.18630.16643B12-28 UNF2A0.0010.2150.20850.19180.18860.17242B3A00.2160.20950.19280.19040.17343B12-32 UNEF2A0.00090.21510.20910.19480.19170.17792B3A00.2160.210.19570.19330.17883B12-36 UNS2A0.00090.21510.
8、20960.19710.19410.18212B12-40 UNS2A0.00090.21510.210.19890.1960.18352B12-48 UNS2A0.00080.21520.21070.20170.19910.19042B12-56 UNS2A0.00070.21530.21120.20370.20120.19412B1A0.00110.24890.23670.21640.21080.18941B1/4-20 UNC2A0.00110.24890.24080.2370.21640.21270.18942B3A00.250.24190.21750.21470.19053B1/4-
9、24 UNS2A0.00110.24890.24170.22180.21810.19932B1/4-27 UNS2A0.0010.2490.24230.22490.22140.20492B1A0.0010.2490.23920.22580.22080.20641B1/4-28 UNF2A0.0010.2490.24250.22580.22250.20642B3A00.250.24350.22680.22430.20743B1/4-32 UNEF2A0.0010.2490.2430.22870.22550.21182B3A00.250.2440.22970.22730.21283B1/4-36
10、UNS2A0.00090.24910.24360.23110.2280.21612B1/4-40 UNS2A0.00090.24910.2440.23290.230.21932B1/4-48 UNS2A0.00080.24920.24470.23570.2330.22432B1/4-56 UNS2A0.00080.24920.24510.23760.2350.2282B1A0.00120.31130.29820.27520.26910.24521B5/16-18 UNC2A0.00120.31130.30260.2980.27520.27120.24522B3A00.31250.30380.2
11、7640.27340.24643B5/16-20 UN2A0.00120.31130.30320.27880.27480.25182B3A00.31250.30440.280.2770.2533B1A0.00110.31140.30060.28430.27880.26181B5/16-24 UNF2A0.00110.31140.30420.28430.28060.26182B3A00.31250.30530.28540.28270.26293B5/16-27 UNS2A0.0010.31150.30480.28740.28390.26742B5/16-28 UN2A0.0010.31150.3
12、050.28830.28490.26892B3A00.31250.3060.28930.28670.26993B5/16-32 UNEF2A0.0010.31150.30550.29120.2880.27432B3A00.31250.30650.29220.28980.27533B5/16-36 UNS2A0.00090.31160.30610.29360.29050.27852B5/16-40 UNS2A0.00090.31160.30650.29540.29250.28182B5/16-48 UNS2A0.00080.31170.30720.29820.29550.28692B1A0.00
13、130.37370.35950.33310.32660.29921B外螺纹 External内螺纹 InternalNominalSine,Threads perInch,and SeriesDesignation级别Class公差Allowance大径Major Diameter中径Pitch Diameter小径UNRMinorDiam.aMax(Ref.)级别ClassMaxb Min MindMaxh Min第 2 页，共 8 页2023/2/233/8-16 UNC2A0.00130.37370.36430.360.33310.32870.29922B3A00.3750.36560.
14、33440.33110.30053B3/8-18 UNS2A0.00130.37370.3650.33760.33330.30762B3/8-20 UN2A0.00120.37380.36570.34130.33720.31432B3A00.3750.36690.34250.33940.31553B1A0.00110.37390.36310.34680.34110.32431B3/8-24 UNF2A0.00110.37390.36670.34680.3430.32432B3A00.3750.36780.34790.3450.32543B3/8-27 UNS2A0.00110.37390.36
15、720.34980.34620.32982B3/8-28 UN2A0.00110.37390.36740.35070.34710.33132B3A00.3750.36850.35180.34910.33243B3/8-32 UNEF2A0.0010.3740.3680.35370.35030.33682B3A00.3750.3690.35470.35220.33783B3/8-36 UNS2A0.0010.3740.36850.3560.35280.34092B3/8-40UNS2A0.00090.37410.3690.35790.35480.34432B0.390-27 UNS2A0.001
16、10.38890.38220.36480.36120.34482B1A0.00140.43610.42060.38970.38260.35111B7/16-14 UNC2A0.00140.43610.42580.4210.38970.3850.35112B3A00.43750.42720.39110.38760.35253B7/16-16 UN2A0.00140.43610.42670.39550.39090.36162B3A00.43750.42810.39690.39350.3633B7/16-18 UNS2A0.00130.43620.42750.40010.39580.37012B1A
17、0.00130.43620.4240.40370.39750.37671B7/16-20 UNF2A0.00130.43620.42810.40370.39950.37672B3A00.43750.42940.4050.40190.3783B7/16-24 UNS2A0.00110.43640.42920.40930.40550.38682B7/16-27 UNS2A0.00110.43640.42970.41230.40870.39232B7/16-28 UNEF2A0.00110.43640.42990.41320.40960.39382B3A00.43750.4310.41430.411
18、60.39493B7/16-32 UN2A0.0010.43650.43050.41620.41280.39932B3A00.43750.43150.41720.41470.40033B1/2-12 UNS2A0.00160.49840.4870.44430.43890.39922B3A00.50.48860.44590.44190.40083B1A0.00150.49850.48220.44850.44110.40691B1/2 UNC2A0.00150.49850.48760.4820.44850.44350.40692B3A00.50.48910.450.44630.40843B1/2-
19、14 UNS2A0.00150.49850.48820.45210.44710.41352B外螺纹 External内螺纹 InternalNominalSine,Threads perInch,and SeriesDesignation级别Class公差Allowance大径Major Diameter中径Pitch Diameter小径UNRMinorDiam.aMax(Ref.)级别ClassMaxb Min MindMaxh Min第 3 页，共 8 页2023/2/23小径MinorDiameter大径小径Min Max0.04650.05141.511.305560.04650.0
20、5141.521.305560.05610.06231.841.582420.05610.06231.851.582420.0580.06351.841.61290.0580.06351.851.61290.06670.07372.171.871980.06670.07372.181.871980.06910.07532.171.912620.06910.07532.181.912620.07640.08452.502.14630.07640.08452.512.14630.07970.08652.502.19710.07970.08652.512.19710.08490.09392.822.
21、385060.08490.09392.842.385060.08940.09682.832.458720.08940.09682.842.458720.09790.10623.152.697480.09790.10623.182.697480.10040.10793.162.740660.10040.10793.182.740660.1040.1143.482.89560.1040.1143.512.89560.1110.1193.483.02260.1110.11863.513.012440.130.1394.143.53060.130.13894.173.528060.1340.1424.
22、153.60680.1340.14164.173.596640.1450.1564.803.96240.1450.15554.833.94970.1510.164.804.0640.1560.1644.804.16560.1560.16414.834.168140.160.1664.804.21640.1630.1694.804.29260.1670.1724.814.36880.1710.1754.814.445内螺纹 Internal第 4 页，共 8 页2023/2/230.1710.1815.464.59740.1710.18075.494.589780.1770.1865.464.7
23、2440.1770.18575.494.716780.1820.195.464.8260.1820.18955.494.81330.1860.1925.464.87680.1890.1955.464.9530.1930.1985.475.02920.1970.2015.475.10540.1960.2076.325.25780.1960.2076.325.25780.1960.20676.355.250180.2050.2156.325.4610.210.2196.325.56260.2110.226.325.5880.2110.226.325.5880.2110.2196.355.56260
24、.2160.2246.325.68960.2160.22296.355.661660.220.2266.335.74040.2230.2296.335.81660.2270.2326.335.89280.2310.2356.335.9690.2520.2657.916.7310.2520.2657.916.7310.2520.2637.946.68020.2580.277.916.8580.2580.2687.946.80720.2670.2777.917.03580.2670.2777.917.03580.2670.27547.946.995160.2720.2817.917.13740.2
25、740.2827.917.16280.2740.28077.947.129780.2790.2867.917.26440.2790.28477.947.231380.2820.2897.917.34060.2850.2917.917.39140.290.2957.927.4930.3070.3219.498.1534小径MinorDiameter大径小径Min Max内螺纹 Internal第 5 页，共 8 页2023/2/230.3070.3219.498.15340.3070.31829.538.082280.3150.3289.498.33120.3210.3329.498.43280
26、.3210.32979.538.374380.330.349.508.6360.330.349.508.6360.330.33729.538.564880.3350.3449.508.73760.3360.3459.508.7630.3360.34269.538.702040.3410.3499.508.86460.3410.34699.538.811260.3450.3529.508.94080.3480.3549.508.99160.350.3599.889.11860.360.37611.089.55040.360.37611.089.55040.360.371711.119.44118
27、0.370.38411.089.75360.370.3811.119.6520.3770.3911.089.9060.3830.39511.0810.0330.3830.39511.0810.0330.3830.391611.119.946640.3920.40211.0810.21080.3970.40611.0810.31240.3990.40711.0810.33780.3990.405111.1110.289540.4040.41111.0910.43940.4040.409411.1110.398760.410.42812.6610.87120.410.422312.7010.726
28、420.4170.43412.6611.02360.4170.43412.6611.02360.4170.428412.7010.881360.4230.43812.6611.1252小径MinorDiameter大径小径Min Max内螺纹 Internal第 6 页，共 8 页2023/2/23公公称称直直径径粗粗牙牙螺螺距距细细牙牙螺螺距距超超细细牙牙螺螺距距钻钻孔孔直直径径钻钻孔孔直直径径（英英寸寸毫毫米米）（UNCUNC）（UNFUNF）（UNEFUNEF）（粗粗牙牙）（细细牙牙）#0#00.0600.0601.5241.524801.2#1#10.0730.0731.8541.85
29、464721.51.5#2#20.0860.0862.1842.18456641.81.8#3#30.0990.0992.5152.515485622.1#4#40.1120.1122.8452.84540482.32.4#5#50.1250.1253.1753.17540442.52.6#6#60.1380.1383.5053.50532402.72.9#8#80.1640.1644.1664.16632363.43.5#10#100.1900.1904.8264.82624323.74#12#120.2160.2165.4865.4862428324.54.61/41/46.356.352
30、028325.15.45/165/167.9387.9381824326.56.93/83/89.5259.52516243288.47/167/1611.11311.1131420289.3101/21/212.712.713202810.711.59/169/1614.28814.28812182412.313.15/85/815.87515.87511182413.514.73/43/419.0519.0510162016.717.57/87/822.22522.2259142019.420.61 125.425.48122022.223.4公称直径每英寸牙数螺距螺纹直径外径d中径d2内
31、径d13/16241.0584.634.0853.4081/4201.2706.25.5374.7245/16181.4117.787.0346.1213/8161.5889.368.5097.4927/16141.81410.939.9518.7891/2122.11712.511.3459.9899/16122.11714.0812.93211.5775/8112.30915.6514.39712.9183/4102.54018.8117.42415.7987/892.82221.9620.41818.611183.17525.1123.36721.33411/873.62928.2526
32、.25223.92911/473.62931.4229.42728.10413/864.23334.5632.21529.50411/264.23337.7335.3932.67915/855.08040.8538.02234.7713/455.08044.0241.19837.94517/84.55.64447.1544.01140.39724.55.64450.3247.18643.57221/446.35056.6253.08449.01921/246.35062.9759.43455.36923/43.57.25769.2665.20460.55733.57.25775.6171.55466.90731/43.257.81581.9177.54672.54231/23.257.81588.2683.89678.89233/438.46794.5589.82984.409438.467100.996.17690.759