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1、公制螺纹底孔钻头直径（毫米）螺纹直径d螺距t钻头直径D铸铁、青铜、黄铜钢、可锻铸铁、紫铜、层压板20.41.61.60.251.751.752.50.452.052.050.352.152.1530.52.52.50.352.652.6540.73.33.30.53.53.550.84.14.20.54.54.5614.950.755.25.281.256.66.716.970.757.17.2101.58.48.51.258.68.718.990.759.19.2121.7510.110.21.510.410.51.2510.610.7110.91114211.8121.512.412.51
2、12.91316213.8141.514.414.5114.915182.515.315.5215.8161.516.416.5116.917202.517.317.5217.8181.518.418.5118.919222.519.319.5219.820221.520.420.5120.92124320.721221.8221.522.422.5122.923英制螺纹底孔钻头直径螺纹直径（英寸）每英寸牙数钻头直径（毫米）铸铁、青铜、黄铜钢、可锻铸铁3/16243.83.91/4205.15.25/16186.66.73/81688.11/21210.610.75/81113.613.83/
3、41016.616.87/8919.519.71822.322.511/872525.211/4728.228.411/263434.213/4539.539.7241/245.345.6圆柱管螺纹底孔钻头直径螺纹直径（英寸）每英寸牙数钻头直径（毫米）1/8288.81/41911.73/81915.21/21418.63/41424.411130.611/41139.213/81141.611/21145.155圆锥管螺纹底孔钻头直径螺纹直径（英寸）每英寸牙数钻头直径（毫米）1/8288.41/41911.23/81914.71/21418.33/41423.611129.711/41138.311/21144.121155.860圆锥管螺纹底孔钻头直径螺纹直径（英寸）每英寸牙数钻头直径（毫米）1/8278.61/41811.13/81814.51/21417.93/41423.21111/229.211/4111/237.911/2111/243.92111/256经验公式：钢及韧性材料： Dd-t铸铁及脆性材料： Dd-(1.05t1.1t)