英制、美制及公制螺纹基本尺寸及公差.pdf

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1、英制、美制及公制螺纹基本尺寸及公差一、英制圆柱管螺纹BSPBSPPBSPPPP的的的的基本尺寸及公差（牙形角55º）基本直径内螺纹外螺纹A级B级螺纹代号大径中径小径中径公差小径公差中径公差大径公差中径公差大径公差+0.170+0.2820000G1/8″×289.7289.1478.5660-0.107-0.214-0.214-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250+0.125+0.4450000G3/8″×191

2、6.66215.80614.95000-0.125-0.250-0.250-0.250+0.142+0.5410000G1/2″×1420.95519.79318.63100-0.142-0.284-0.284-0.284+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+0.64

3、00000G1″×1133.24931.77030.29100-0.180-0.360-0.360-0.360+0.180+0.6400000G1.1/4″×1141.91040.43138.95200-0.180-0.360-0.360-0.360+0.180+0.6400000G1.1/2″×1147.80346.32444.85400-0.180-0.360-0.360-0.360+0.180+0.6400000G2″×1159.61458.13556.65600-0.180-0.360-0.360-0.

4、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+0.6400000G3.1/2”X11100.33098.85197.37200-0.217-0.434-0.434-0.434二、英制圆锥管螺纹（BSPTBSPTBSPT）的基本尺寸及公差BSPT（牙形角55º）基面上的直

5、径基准长度有效螺纹长度圆锥内螺纹基面轴向螺纹代号大径中径小径基本最大最小基本最大最小位移偏差（±mm）R1/8″×289.7289.1478.5664.04.93.16.57.45.61.1R1/4″×1913.15712.30111.4456.07.34.79.711.08.41.7R3/8″×1916.66215.80614.9506.47.75.110.111.48.81.7R1/2″×1420.95519.79318.6318.210.06.413.215.011.42.3R3/4″×1426.4412

6、5.27924.1179.511.37.714.516.312.72.3R1″×1133.24931.77030.29110.412.78.116.819.114.52.9R1.1/4″×1141.91040.43138.95212.715.010.419.121.416.82.9R1.1/2″×1147.80346.32444.84512.715.010.419.121.416.82.9R2″×1159.61458.13556.65615.918.213.623.425.721.12.9R2.1/2”X117

7、5.18473.70572.22617.521.014.026.730.223.23.5R3”X1187.88486.40584.92620.624.117.129.833.326.33.5R3.1/2”X11100.33098.85197.37222.225.718.731.434.927.93.5三、美制管螺纹（UN(F)UN(F)UN(F)）基本尺寸及公差UN(F)（牙形角60º）外螺纹内螺纹公差等级公差等级螺纹代号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″×20

8、UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.1131/2″×20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.79/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.521