螺纹钻底孔用钻头直径尺寸表

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 5/8 in D 0=25(d-1/n) D 0=25(d-1/n)+0.13/4 1 in D 0=25(d-1/n) D 0=25(d-1/n)+0.2D 0 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3/16243.73.77/8919.119.31/4205.05.11821.9225/16186.46.51 1/8724.624.73/8167.87.91 1

2、/4727.827.97/16149.19.31 1/2633.433.51/21210.410.51 5/8535.735.89/16121212.11 3/4538.9395/81113.313.51 7/84 1/241.441.53/41016.316.424 1/244.644.7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)1/8288.811130.51/41911.71 1/81135.23/81915.21 1/41139.21/21418.91 3/81141.65/81420.81 1/21145.13

3、/41424.31 3/411517/81428.121157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)1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.31417.93/41423.63/41423.211129.7111 29.21 1/41138.31 1/411 37.91 1/21144.11 11 43.921155.8211 56公制螺纹钻底孔用钻头直径尺寸表 （毫米）公称直径d螺 距t钻头直径 dz公称直径d

4、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321.532.933.934.58粗1.256.739粗435细10.7577.2细321.535.936.937.

5、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2.515.4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