Cap for Screw Hole 螺丝孔小帽
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。
At the same time, the high-neck flange and the cap straddle the screw hole can be completed a one-time processing, manufacturing is simple and convenient.
同时，端部法兰和顶盖骑缝中的螺纹孔可以一次性加工完成，加工制造简单方便。
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