管螺纹的基本尺寸表(3-29)G1/2、ZG1/2、(以焊管、镀锌管为例)通称尺寸对应口径尺寸代号外径壁厚最小壁厚每25.4mm类的牙数n螺距p牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径(基准直径)d=D中径d2=D2小径d1=D11/16280.9070.5810.1257.7237.1426.56146.51分1/8280.9070.5810.1259.7289.1478.56646.52分DN81/4191.3370.5860.18413.15712.30111.44569.73分3/8191.3370.5860.18416.66215.80614.950610.14分DN151/221.32.82.45141.8141.1620.24920.95519.79318.631813.26分DN203/426.92.82.45141.8141.1620.24926.44125.27924.1171014.51寸DN25133.73.22.8112.3091.4790.31733.24931.77030.2911016.81.2寸DN321.1/442.43.53.06112.3091.4790.31741.91040.43138.9521319.11.5寸DN401.1/248.33.53.06112.3091.4790.31747.80346.32444.8451319.12寸DN50260.33.83.325112.3091.4790.31759.61458.13556.6561623.42.5寸DN652.1/276.143.5112.3091.4790.31775.18473.70572.2261826.73寸DN80388.94112.3091.4790.31787.88486.40584.9262129.83.5寸3.1/2112.3091.4790.317100.33098.85197.3722231.44寸DN1004114.34112.3091.4790.317113.030111.551110.0722535.85寸DN12551404.5112.3091.4790.317138.430136.951135.4722940.16寸DN1506168.34.5112.3091.4790.317163.830162.351160.8722940.18寸DN2008219.110寸DN2501英寸=25.4mm=8分以上壁厚尺寸以焊管、镀锌管理论重量为例(按GB/T3091-2001
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执行)锥管螺纹的基本尺寸表(3-28)1/2PT、1/2NPT、表(3-28)螺纹基本尺寸(单位:mm)尺寸代号每25.4mm类的牙数n基面上的基本直径基准距离大径(基准直径)d=D中径d2=D2小径d1=D11/16277.8957.1426.3894.0641/82710.2429.4898.7364.1021/41813.61612.48711.3585.7863/81817.05515.92614.7976.0961/21421.22319.77218.3218.1283/41426.56825.11723.6668.61111233.22831.46129.69410.1601.1/41241.98540.21838.45110.6681.1/21248.05446.28744.52010.66821260.09258.32556.55811.0742.1/2872.69970.15967.61917.3233888.60886.06883.52819.4563.1/28101.31698.77696.23620.85348113.973111.433108.89321.438