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1、英制螺纹钻底孔用钻头直径尺寸表计算公式：螺纹公称直径钢与黄铜D o=25 (d-1/n ) +0.1D o=25 (d-1/n ) +0.2铸铁与青铜3/16?5/8inDo=25(d-1/n)3/4?1?inDo=25(d-1/n)D0攻螺纹前钻头直径(mm)d螺纹公称直径(in)n每英寸牙数公称直径（英寸）每英寸牙数钻头宜径（毫米）公称直径（英寸）每英寸牙数钻头宜径（毫米）铸铁、青铜钢、黄铜铸铁、青铜钢、黄铜3/16243.73.77/8919.119.31/4205.05.11821.9225/16186.46.511/8724.624.73/8167.87.911/4727.827.9
2、7/16149.19.311/2633.433.51/21210.410.515/8535.735.89/16121212.113/4538.9395/81113.313.517/841/241.441.53/41016.316.4241/244.644.7圆柱管螺纹钻底孔用钻头直径尺寸表公称直径（英寸）每英寸牙数钻头宜径（毫米）公称直径（英寸）每英寸牙数钻头宜径（毫米）1/8288.811130.51/41911.711/81135.23/81915.211/41139.21/21418.913/81141.65/81420.811/21145.13/41424.313/411517/814
3、28.121157圆锥管螺纹钻底孔用钻头直径尺寸表55圆锥管螺纹60圆锥管螺纹公称直径（英寸）每英寸讦豺钻头宜径（毫米）公称直径（英寸）每英寸讦豺钻头宜径（毫米）1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.3?1417.93/41423.63/41423.211129.7111?29.211/41138.311/411?37.911/21144.11?11?43.921155.8211?56公称直径螺距钻头宜径公称直径螺距钻头宜径dtdzdtdz粗0.250.75粗2.519.5122219.9细0.20.8细1.52
4、0.5121粗0.41.6粗320.9224221.9细0.251.75细1.522.5123粗0.52.5粗324224.93细0.352.6527细1.525.5126粗0.73.3粗3.526.5326.9430心227.9细0.53.5细1.528.5129粗0.84.2粗3.529.5533329.9细0.54.5细230.91.531.5粗15粗432636332.9细0.755.2细233.91.534.5粗1.256.7粗4358,1739335.9757.2细21536.93751.0Of.o粗1.58.5粗4.537.3437.8101.25细10.758.799.242细
5、3C21538.939.9勺1.Utu.u粗1.7510.2粗4.540.5440.8121.510.545m341.9细1.2510.7细C242.9111dr:/Incr1.543.5粗211.9粗542.7443.8141.5细1.25112.512.71348细3*24r44.945.9anr1.546.5粗214粗547447.81611.514.552细348.9E，15细249.915505粗2.515.4.18215.9细1.516.511711f粗2.517.420217.918.519名田1.51（二）普通螺纹宜径与螺距系列D-内螺纹大径d-外螺纹大径i） 2-内螺纹中径 心-外螺纹中径D-内螺纹小径右-外螺纹小径P-螺蹿原始生角形高度八4-1-I普通螺纹基木牙型及尺J计算=W=0.8660254m/，5-_七二().541265X77；昌q/=()324759526M二0.216506351P;、十=).108253175PII旧机械制图标准的管螺纹代号与现行管螺纹代号的对应关系序号不性现行特征代号含义旧机械制图标准155密封管螺纹Rc圆锥内螺纹ZGRp圆柱内螺纹R1与圆柱内螺纹（Rp）配合的圆锥外螺纹R2与圆锥内螺纹（Rc）配合的圆锥外螺纹2550非密封管螺纹GG360密封管螺纹NPT圆锥管螺纹ZNPSC圆柱内螺纹4米制锥螺纹ZM
