螺纹基本尺寸对照表

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1、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G1/8″×289.7289.1478.566+0.170+0.28200-0.1070-0.2140-0.2140-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″×1916.66215.80614.950+0.1250+0.44500-0.1250-0.2500-0.2500-0.250G1/2″×1420.95519.

2、79318.631+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G5/8″×1422.91121.74920.587+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G3/4″×1426.44125.27924.117+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G1″×1133.24931.77030.291+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/4″×1141.91040.43138.952+0.

3、1800+0.64000-0.1800-0.3600-0.3600-0.360G1.1/2″×1147.80346.32444.854+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2″×1159.61458.13556.656+0.1800+0.64000-0.1800-0.3600-0.3600-0.360G2.1/2”X1175.18473.70572.226+0.2170+0.64000-0.2170-0.4340-0.4340-0.434G3”X1187.88486.40584.926+0.2170+0.64000

4、-0.2170-0.4340-0.4340-0.434G3.1/2”X11100.33098.85197.372+0.2170+0.64000-0.2170-0.4340-0.4340-0.434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（±mm）大径中径小径基本最大最小基本最大最小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″×1916.66

5、215.80614.9506.47.75.110.111.48.81.7R1/2″×1420.95519.79318.6318.210.06.413.215.011.42.3R3/4″×1426.44125.27924.1179.511.37.714.516.312.72.3R1″×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″×1147.80346.32444.84512.715.010.41

6、9.121.416.82.9R2″×1159.61458.13556.65615.918.213.623.425.721.12.9R2.1/2”X1175.18473.70572.22617.521.014.026.730.223.23.5R3”X1187.88486.40584.92620.624.117.129.833.326.33.5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G1/8″×289.7289.1478.566+0.170+0.28200-0.1

7、070-0.2140-0.2140-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″×1916.66215.80614.950+0.1250+0.44500-0.1250-0.2500-0.2500-0.250G1/2″×1420.95519.79318.631+0.1420+0.54100-0.1420-0.2840-0.2840-0.284G5/8″×1422.91121.74920.587+0.1420+0.54100-0.1420-0.2840-0.2840

8、-0.284G3/4″×