15问答网 > M8的螺纹孔应选用直接为多少mm的麻花钻加工底孔？

M8的螺纹孔应选用直接为多少mm的麻花钻加工底孔？

2025-04-10 10:39:09
推荐回答（1个）
回答1：

螺孔攻丝前的钻孔直径，如果螺孔的精度要求不高，一般为凭经验选取，M8的螺孔钻孔直径为6.5毫米，但是有一些对加工精度要求较高的螺孔，就不能凭经验了，这时要严格按照国标《GB/T 20330-2006 攻丝前钻孔用麻花钻直径》来执行，该标准有关页面复制如下，你说的M8螺孔也在其中：

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