... 双重绝缘 double insulation 螺纹切削自切螺钉 thread-cutting tapping screw 螺纹成型自攻螺钉 thread-forming taping screw ...
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thread cutting tapping screw 螺纹切削式自攻螺钉
thread-cutting tapping screw
螺纹自攻螺钉
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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