H=0.8666025P h=0.8P f=0.033P每25.4mm螺纹尺寸代号内的螺纹牙数n1\\161\\81\\43\\81\\23\\411 1\\41 1\\222 1\\233 1\\24568101227271818141411.511.511.511.5888888888基面上的基本直径大径(基准直径)d＝D7.89510.24213.61617.05521.22326.56833.22841.98548.05460.09272.69988.608101.316113.973140.952167.792218.441272.312323.032中径d2＝D27.1429.48912.48715.92619.77225.11731.46140.21846.28758.32570.15986.06898.776111.433138.412165.252215.901269.772320.492小径d1＝D16.3898.73611.35814.79718.32123.66629.69438.45144.5256.55867.61983.52896.236108.893135.872162.712213.361267.232317.952基准距离L1距离4.0644.1025.7866.0968.1288.61110.1610.66810.68811.07417.32319.45620.85321.43823.824.3332730.73434.544牙数4.324.364.14.324.484.754.64.834.835.015.466.136.576.757.57.668.59.6810.88装配余量L3管子外径距离2.8222.8224.2344.2345.4435.4436.6276.6276.6276.6276.356.356.356.356.356.356.356.356.35牙数33333333332222222227.93810.28713.71617.14521.33626.6733.40142.16448.2660.32573.02588.9101.6114.3141.3168.275219.075273.05323.85圆锥外螺纹小端面处的螺纹外径6.1358.4810.99714.41617.81323.12829.05937.78443.85455.86666.53682.31294.932107.553134.384161.191211.673265.311315.793