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SS 304 316 Pan Head Screw Stainless Steel Self Tapping ScrewsProduct：

Self tapping screw hardness is high, thread spacing is wide, thread depth, the surface is not smooth, wood screw is on the contrary, another difference is more obvious, wood screw after the segment without thread. Wood screw thread thin, blunt and soft point. Tapping screw threads are thick, sharp and hard.

Self-drilling tapping screw (self-drilling screw)

People have made statistics: among the ten expenses which constitute the total assembly cost, the highest one includes the machining of holes. In practical application, self tapping screws need to process prefabricated holes. And in order to make the prefabricated holes play a good effect in practical application, it is necessary to control the size of these holes in a very strict range. In the early 1960s, self-drilling and tapping screws appeared. As there is no need to process prefabricated holes, it is a big step forward in reducing assembly costs. Generally speaking, the self-drilling and tapping screws achieve drilling, tapping and fastening in one operation.

Production Process