通称尺寸1分2分3分4分6分1寸1.2寸1.5寸2寸2.5寸3寸3.5寸4寸5寸6寸8寸10寸对应口尺寸代号径1/161/81/43/81/23/411.1/41.1/222.1/233.1/2456外径壁厚最小壁厚每25.4mm类的牙数n28281919141411111111111111111111螺距p0.9070.9071.3371.3371.8141.8142.3092.3092.3092.3092.3092.3092.3092.3092.3092.309牙型高度h0.5810.5810.5860.5861.1621.1621.4791.4791.4791.4791.4791.4791.4791.4791.4791.479圆弧半径r≈0.1250.1250.1840.1840.2490.2490.3170.3170.3170.3170.3170.3170.3170.3170.3170.317基面上的基本直径大径（基小径准直径）中径d2=D2d1=D1d=D7.7237.1426.5619.7289.1478.56613.15712.30111.44516.66215.80614.95020.95519.79318.63126.44125.27924.11733.24931.77030.29141.91040.43138.95247.80346.32444.84559.61458.13556.65675.18473.70572.22687.88486.40584.926100.33098.85197.372113.030111.551110.072138.430136.951135.472163.830162.351160.872基准距离446681010131316182122252929有效螺纹长度6.56.59.710.113.214.516.819.119.123.426.729.831.435.840.140.1DN8DN15DN20DN25DN32DN40DN50DN65DN80DN100DN125DN150DN200DN25021.326.933.742.448.360.376.188.9114.3140168.32.82.83.23.53.53.84444.54.52.452.452.83.063.063.3253.58219.11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标准执行）
锥管螺纹的基本尺寸表（3-28）1/2PT 、
1/2NPT 、基面上的基本直径每25.4mm类的牙数n
尺寸代号1/161/81/43/81/23/411.1/41.1/222.1/233.1/24每25.4mm大径（基类的牙数n准直径）d=D277.8952710.2421813.6161817.0551421.2231426.5681233.2281241.9851248.0541260.092872.699888.6088101.3168113.973中径d2=D27.1429.48912.48715.92619.77225.11731.46140.21846.28758.32570.15986.06898.776111.433小径d1=D16.3898.73611.35814.79718.32123.66629.69438.45144.52056.55867.61983.52896.236108.893基准距离4.0644.1025.7866.0968.1288.61110.16010.66810.66811.07417.32319.45620.85321.438
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