Tapping is the process of cutting a thread inside a hole so that a cap screw or bolt may be threaded into it.

攻丝是在一个孔中车出螺纹，以便装上有帽螺钉或螺栓。

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Tapping is the process of cutting a thread inside a hole so that a cap screw or bolt may be threaded into it.

攻丝是在一个孔中车出螺纹，以便装上有帽螺钉或螺栓。

youdao