管螺纹基本尺寸表

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1、管螺纹的基本尺寸表英制管螺纹内径外径对照表（换算成公制得对照表）尺寸代号 每寸牙数   大径     中径     小径     建议底孔      基准距离      牙数1/8        27    10.242    9.489    8.736      φ8.6         4.102        4.361/4        18     13.616   12.487    11.358     φ11.1        5.786        4.103/8        18     17.055   15.92

2、6    14.797     φ14.5        6.096        4.321/2        14     21.223   19.772    18.321     φ17.9        8.128        4.483/4        14     26.568   25.117    23.666     φ23.2        8.611        4.751         11.5    33.228   31.461    29.694     φ29.2       10.160      

3、 4.601-1/4      11.5    41.985   40.218    38.451     φ37.9       10.668       4.831-1/2      11.5    48.054   46.287    44.520     φ43.9       10.668       4.83管螺纹的基本尺寸表（3-29）G1/2、ZG1/2、表（3-29）螺纹基本尺寸(单位:mm)尺寸代号每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

4、径d1=D11/16280.9070.5810.1257.7237.1426.5614.06.51/8280.9070.5810.1259.7289.1478.5664.06.51/4191.3370.5860.18413.15712.30111.4456.09.73/8191.3370.5860.18416.66215.80614.9506.410.11/2141.8141.1620.24920.95519.79318.6318.213.23/4141.8141.1620.24926.44125.27924.1179.514.51112.3

5、091.4790.31733.24931.77030.29110.416.81.1/4112.3091.4790.31741.91040.43138.95212.719.11.1/2112.3091.4790.31747.80346.32444.84512.719.12112.3091.4790.31759.61458.13556.65615.923.42.1/2112.3091.4790.31775.18473.70572.22617.526.73112.3091.4790.31787.88486.40584.92620.629.83.1/

6、2112.3091.4790.317100.33098.85197.37222.231.44112.3091.4790.317113.030111.551110.07225.435.85112.3091.4790.317138.430136.951135.47228.640.16112.3091.4790.317163.830162.351160.87228.640.1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

7、中径d2=D2小径d1=D11/16277.8957.1426.3894.0641/82710.2429.4898.7364.1021/41813.61612.48711.3585.7863/81817.05515.92614.7976.0961/21421.22319.77218.3218.1283/41426.56825.11723.6668.611111.533.22831.46129.69410.1601.1/411.541.98540.21838.45110.6681.1/211.548.05446.28744.52010.6682

8、11.560.09258.32556.55811.0742.1/2872.69970.15967.61917.3233888.60886.06883.52819.4