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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The fixed connecting piece consists of a bolt and a screw cap.
固定连接件由螺栓和螺帽组成。
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