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1、H= 0.866P d2=d-）.6495P d仁 d -1.0825PD、d 内、外螺纹大 径D2、d2 内、外螺纹 中径Di、di 内、外螺纹 小径标记示例：M20 6H公称直径20粗牙右旋内螺纹，中径和大径公差 带均为6HM20 6g公称直径20粗牙右旋外螺纹，中径和大径公差带为6gM20 6H/6g（上述规格的螺纹副）M20X 2 左5g 6g S公称直径20、螺距2细牙左旋外螺纹，中径和大公称直径D、d螺距中径小径公称直径D、d螺 距中径小径公称直径D、d螺距中径小径第一第二D2、d2D1、 d1第一第二D2、d2D1、 d1第一第二D2、d2D1、 d1系列系列P系列系列P系列系列
2、P0.52.6752.4594 O1.517.02616.376o c237.70136.83530.352.7732.62118117.35016.917391.538.02637.376(0.6)3.1102.8502.518.37617.2944.539.07737.1293.50.353.2733.121on218.70117.835AO340.05138.752A0.73.5453.242201.519.02618.37642240.70139.83540.53.6753.459119.35018.9171.541.02640.376A C(0.75)4.0133.6882.520.
3、37619.2944.542.07740.1294.50.54.1753.959on220.70119.835AR343.05141.7520.84.4804.134221.521.02620.37645243.70142.83550.54.6754.459121.350.20.9171.544.02643.376a15.3504.917322.05120.752444.75242.58760.755.5135.188222.70121.835A Q346.05144.7521.257.1886.647241.523.02622.37648246.70145.835817.3506.91712
4、3.35022.9171.547.02646.3760.757.5137.188325.05123.752548.75246.587Q COQ225.70124.835co350.05148.7521.59.0268.3 7 6271.526.02625.37652250.70149.8351.259.1888.6471019 3508.917126.35025.9171.551.02650.37610.759.5139.1883.527.72726.2115.552.42850.0461.7510.86310.10630228.70127.853453.40251.6701.511.0261
5、0.3761.529.02628.37656354.05152.752121.2511.18810.647129.35028.917254.70153.835111.35010.917333.530.72729.2111.555.02654.376231.70130.835d A212.70111.8351.532.02631.376(5.5)56.42854.046141.513.02612.3 76457.40255.670113.35012.917433.40231.67060358.05156.752214.70113.83536334.05132.752258.70157.835161.515.02614.376234.70133.8351.559.02658.376115.35014.9171.535.02634.376660.10357.5052.516.37615.294436.40234.67064461.40259.67018216.70115.83539337.05135.572362.05160.752P螺距径公差带分别为5g、6g,短旋合长度注：1.螺距P栏中第一个数值为粗牙螺距，其余为细牙螺距。2 优先选用第一系列，其次第二系列，第三系列（表中未列岀）尽可能不用3 括号内尺寸尽可能不用。
