• 1. thread cutting tapping screw: 螺纹切削式自攻螺钉
• 2. thread-cutting tapping screw: 螺纹切削自切螺钉

• 1.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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