Hardware installation of shake handshandle of tapping screw what is history?
metal shake handshandle tapping screw developed by sheet metal screws, screw thread forming self tapping screw must be drilled in advance, when using the screw hole again, strong extrusion with female thread, and the original material will be packed in the position of female to male, between this call of thread forming self tapping screw.
only can be applied to thin and resilient materials, therefore developed; Thread cutting tapping screw in the thread end cutting out one or more of the cutting mouth, enabling the screwing in drilled, using screw tail and teeth in a similar way of tap cutting out with female thread. It can be used in thick plate, more hard and brittle materials is not easy to shape.
this is the history of the hardware and the installation of shake handshandle self-tapping screws.