M2 stainless steel 304 thin head cross drive machine screw manufacturer

Industry knowledge：

Stainless steel self tapping screw has high hardness, wide thread spacing, deep thread and unsmooth surface, while wood screw has the opposite. The other difference is more obvious. The back section of wood screw has no thread. The thread of wood screw is thin, blunt and soft. The thread of self tapping screw is thick, sharp and hard.
Stainless steel self tapping screws began to be commercialized in 1914. The first design was mainly made of wood screws. At that time, it was mainly used to connect the iron sheet on the air-conditioning duct, so it was also called iron sheet screw.