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1、实用标准文案英制管螺纹基本尺寸及公差（牙形角 55o） BSPP螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差A级B级中径公差大径公差中径公差大径公差+0.170+0.2820000G1/8289.7289.1478.5660-0.107-0.214-0.214-0.214G1/4 2913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250+0.125+0.4450000G3/8 1916.66215.80614.95000-0.125-0.250-0.250-0.250+0.142+0.5410000G1/2 1420.955
2、19.79318.63100-0.142-0.284-0.284-0.284+0.142+0.5410000G5/8 1422.91121.74920.58700-0.142-0.284-0.284-0.284+0.142+0.5410000G3/4” 1426.44125.27924.11700-0.142-0.284-0.284-0.284+0.180+0.6400000G1 1133.24931.77030.29100-0.180-0.360-0.360-0.360+0.180+0.6400000G1.1/4” X141.91040.43138.95200-0.180-0.360-0.3
3、60-0.360+0.180+0.6400000G1.1/2X147.80346.32444.85400-0.180-0.360-0.360-0.360+0.180+0.6400000Z/G21159.61458.13556.65600-0.180-0.360-0.360-0.360+0.217+0.6400000G2.1/2” X1175.18473.70572.22600-0.217-0.434-0.434-0.434+0.217+0.6400000G3 ”X1187.88486.40584.92600-0.217-0.434-0.434-0.434+0.217+0.6400000G3.1
4、/2” X11100.33098.85197.37200-0.217-0.434-0.434-0.434英制锥管螺纹基本尺寸及公差（牙形角 55o） BSPT螺纹代号基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向位移偏差（土mm ）大径中径小径基本最大最小基本最大最小R1/8 2289.7289.1478.5664.04.93.16.57.45.61.1R1/4 X913.15712.30111.4456.07.34.79.711.08.41.7R3/8 X916.66215.80614.9506.47.75.110.111.48.81.7R1/2 X420.95519.79318.631
5、8.210.06.413.215.011.42.3R3/4 濟426.44125.27924.1179.511.37.714.516.312.72.3rTmi33.24931.77030.29110.412.78.116.819.114.52.9R1.1/441.91040.43138.95212.715.010.419.121.416.82.9R1.1/247.80346.32444.84512.715.010.419.121.416.82.9R21159.61458.13556.65615.918.213.623.425.721.12.9R2.1/2 ” X1175.18473.70572
6、.22617.521.014.026.730.223.23.5R3” X1187.88486.40584.92620.624.117.129.833.326.33.5R3.1/2 ” X11100.33098.85197.37222.225.718.731.434.927.93.5美制管螺纹基本尺寸及公差(牙形角 60o) UN(F)螺纹代号外螺纹内螺纹公差等级公差等级2A2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16 爲0UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.1131/2 20UNF
7、12.66712.46111.84111.73211.15611.32811.60811.87512.01712.79/16 18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.2883/4 X6UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.057/8 X4UNF22.18421.92321.00620.86920.02520.26920.67621.04621.22422.2251-1/16 12UN26.94426.65525.5725.42524.
8、42524.68925.14625.61325.80126.9881-5/16 X2UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.3381-5/8 X2UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.2751-7/8 X2UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.6252-1/2 X2UN63.45263.16262.07861.9260.93261.21461.67162.12662.3
9、3263.5ORFS螺纹9/16 X8UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.28811/16 X6UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.46313/16 X6UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.638精彩文档实用标准文案1X4UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.41-3/1
10、6 X2UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.1631-7/16 X2UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.5131-11/16 X2UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.863212UN50.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE螺纹5/8 X8UNF15.83915.61814.9231
11、4.80314.16114.35114.68114.95815.1115.8751-1/16 *4UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16 X6UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.2887/8 X2UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.2252-1/4 X2UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列布锥管螺纹基本尺寸及公差（牙形角60o） NPT螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8 汐10.2729.5198.76674.57
