管螺纹基本尺寸表.doc

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 8.6 4.102 4.36 1/4 18 13.616 12.487 11.358 11.1 5.786 4.10 3/8 18 17.055 15.926 14.797 14.5 6.096 4.32 1/2 14 21.223 19.772 18.321 17.9 8.128 4.48 3/4 14 26.568 25.117 23.666 23.2 8.611 4.75 1 11.5 33.228 31.461 29.694 29.2 10.160 4.60 1-1/4 11.5 41.985 40.218 38.451 37.9 10.668 4.83 1-1/2 11.5 48.054 46.287 44.520 43.9 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=D11/16280.9070.5810.1257.7237.1426.5614.06.51/8280.9070.5810.1259.7289.1478.5664.06.51/4191.3370.5860.18413.15712.30111.4456.09.73/8191.3370.5860.18416.66215.80614.9506.410.11/2141.8141.1620.24920.95519.79318.6318.213.23/4141.8141.1620.24926.44125.27924.1179.514.51112.3091.4790.31733.24931.77030.29110.416.81.1/4112.3091.4790.31741.91040.43138.95212.719.11.1/2112.3091.4790.31747.80346.32444.84512.719.12112.3091.4790.31759.61458.13556.65615.923.42.1/2112.3091.4790.31775.18473.70572.22617.526.73112.3091.4790.31787.88486.40584.92620.629.83.1/2112.3091.4790.317100.33098.85197.37222.231.44112.3091.4790.317113.030111.551110.07225.435.85112.3091.4790.317138.430136.951135.47228.640.16112.3091.4790.317163.830162.351160.87228.640.1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=D11/16277.8957.1426.3894.0641/82710.2429.4898.7364.1021/41813.61612.48711.3585.7863/81817.05515.92614.7976.0961/21421.22319.77218.3218.1283/41426.56825.11723.6668.611111.533.22831.46129.69410.1601.1/411.541.98540.21838.45110.6681.1/211.548.05446.28744.52010.668211.560.09258.32556.55811.0742.1/2872.69970.15967.61917.3233888.60886.06883.52819.4563.1/28101.31698.77696.23620.85348113.973111.433108.89321.438A型美制螺纹（UNF）常用规格 外螺纹 内螺纹-4 9/16-19牙 14.28 13.08 -6 11/16-16 17.46 16.1 -8 13/16-16 20.64 19.28-10 1-14 25.40 23.57 -12 1(3/16)-12 30.00 28.32 -16 1(7/16)-12 36.51 34.67-20 1(11/16)-12 42.86 41.02英制,公制螺纹对照表.尺寸代号每英寸牙数螺 距螺纹 直 径（in)np大径D、d小径D1、d11/16280.9077.7236.5611/8280.9079.7288.5661/4191.33713.15711.4453/8191.33716.66214.951/2141.81420.95518.6315/8141.81422.91120.5873/4141.81426.44124.1177/8141.81430.20127.8771112.30933.24930.2911-1/8112.30937.89734.9391-1/4112.30941.9138.9521-1/2112.30947.80344.8451-3/4112.30953.74650.7882112.30959.61456.6562-1/4112.30965.7162.7522-1/2112.30975.18472.2262-3/4112.30981.53478.5783112.30987.88484.9263-1/2112.309100.3397.3724112.309113.03110.0725112.309138.43135.4726112.309163.83160.872注：1in=25.4mm1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下：Rc圆锥内螺纹 55度Rp与圆锥外螺纹配合的圆柱