螺纹钻底孔用钻头直径尺寸表

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1、英制螺纹钻底孔用钻头直径尺寸表计算公式：螺纹公称直径铸铁与青铜钢与黄铜3/16~5/8inD0=25(d-1/n)D0=25(d-1/n)+0.13/4~1½inD0=25(d-1/n)D0=25(d-1/n)+0.2D0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)每英寸牙数钻头直径(毫米)公称直径(英寸)每英寸牙数钻头直径(毫米)铸铁、青铜钢、黄铜铸铁、青铜钢、黄铜3/16243.73.77/8919.119.31/4205.05.11821.9225/16186.46.511/8724.624.73/8167.87.91

2、1/4727.827.97/16149.19.311/2633.433.51/21210.410.515/8535.735.89/16121212.113/4538.9395/81113.313.517/841/241.441.53/41016.316.4241/244.644.7圆柱管螺纹钻底孔用钻头直径尺寸表公称直径(英寸)每英寸牙数钻头直径(毫米)公称直径(英寸)每英寸牙数钻头直径(毫米)1/8288.811130.51/41911.711/81135.23/81915.211/41139.21/21418.913/81141.65/81420.8

3、11/21145.13/41424.313/411517/81428.121157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)每英寸牙数钻头直径(毫米)公称直径(英寸)每英寸牙数钻头直径(毫米)1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.3½1417.93/41423.63/41423.211129.7111½29.211/41138.311/411½37.911/21144.11½11½43.921155.8211½56公制螺纹钻底孔用钻头直

4、径尺寸表（毫米）公称直径d螺距t钻头直径dz公称直径d螺距t钻头直径dz1粗0.250.7522粗2.519.5细0.20.8细21.5119.920.5212粗0.41.624粗320.9细0.251.75细21.5121.922.5233粗0.52.527粗324细0.352.65细21.5124.925.5264粗0.73.330粗3.526.5细0.53.5细321.5126.927.928.5295粗0.84.233粗3.529.5细0.54.5细321.529.930.931.56粗1536粗432细0.755.2细321.532.933.9

5、34.58粗1.256.739粗435细10.7577.2细321.535.936.937.510粗1.58.542粗4.537.3细1.2510.758.799.2细4321.537.838.939.940.512粗1.7510.245粗4.540.5细1.51.25110.510.711细4321.540.841.942.943.514粗211.948粗542.7细1.51.25112.512.713细4321.543.844.945.946.516粗21452粗547细1.5114.515细4321.547.848.949.950.518粗2.51

6、5.4细21.5115.916.51720粗2.517.4细21.5117.918.519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种类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255°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