各种材料攻丝时钻孔直径.doc

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1、【攻丝时钻孔直径】一、攻公制普通螺纹的底孔直径可由下列经验公式确定：｛塑性材料D0=D－P｝｛脆性材料D0=D－（1.05～1.1）P｝D0～钻头直径D～螺纹大径P～螺距螺纹直径螺距P钻头直径D0螺纹直径螺距P钻头直径D0（脆性）铸铁、青铜、黄铜(塑性)钢、紫铜可锻铸铁、（脆性）铸铁、青铜、黄铜(塑性)钢、紫铜可锻铸铁、20.40.251.61.751.61.75121.751.51.25110.110.410.610.910.210.510.7112.50.450.352.052.152.052.151421.5111.812.412.91212.51330.50.352.52.652

2、.52.651621.5113.814.414.91414.51540.70.53.33.53.33.5182.521.5115.315.816.416.915.51616.51750.80.54.14.54.24.5202.521.5117.317.818.418.917.51818.519610.754.95.255.2222.521.5119.319.820.420.919.52020.52181.2510.756.66.97.16.777.224321.5120.721.822.422.9212222.523101.51.2510.758.48.68.99.18.58.799.2

3、二、英制螺纹、圆柱管螺纹《G》攻丝前钻底孔的钻头直径英制螺纹圆柱管螺纹《G》螺纹直径″每英寸牙数钻头直径螺纹直径″每英寸牙数钻头直径铸铁、青铜黄铜钢、可锻铸铁3/16243.83.91/8288.81/4205.15.21/41911.75/16186.66.73/81915.23/81688.11/21418.91/21210.610.73/41424.45/81113.613.811130.63/41016.616.811/41139.27/8919.519.713/81141.61822.322.511/21145.111/872525.211/4728.228.411/26343

4、4.213/4539.539.7241/245.345.6三、圆锥管螺纹攻丝前钻底孔的钻头直径55°圆锥管螺纹《ZG》60°圆锥管螺纹《Z》公称直径″每英寸牙数钻头直径㎜公称直径″每英寸牙数钻头直径㎜1/8288.41/8278.61/41911.21/41811.13/81914.73/81814.51/21418.31/21417.93/41423.63/41423.211129.71111/229.211/41138.311/4111/237.911/21144.111/2111/243.921155.82111/256