螺纹攻丝前钻孔直径表.doc

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1、螺纹孔攻丝前的钻孔直径（一）公称直径（MM）普通粗牙螺纹普通细牙螺纹孔径mm螺距mm螺距（MM）0.200.250.350.50.7511.251.523410.750.250.821.60.41.752.520.452.1532.50.52.6543.30.753.554.20.84.56515.286.71.257.57.27108.51.59.298.71210.21.751110.710.5141221312.712.51613.9215.21514.51815.42.517.21716.515.92017.42.519

2、.21918.517.92219.42.521.22120.52420.9323.22322.52723.932625.524.93026.43.52928.527.926.93329.43.531.530.929.93631.8434.533.932.93934.8437.536.935.94237.34.540.539.938.937.84540.34.543.542.941.940.8