Self drilling screws are usually classified as self-tapping screws, which are also self-tapping thread. The tail is different from ordinary self-tapping screws. It is a drill bit rather than a pointed tail.

A self-tapping screw is a screw with a drill bit, and they are composed of three parts: the head, the shank and the end of the shank. At present, most of the self-tapping screws on the market are made of carbon steel and stainless steel. Both carbon steel and stainless steel self tapping screws need to be heat treated, so that the self tapping screw can reach the standard mechanical properties. The surface hardness of self tapping screws is high, and the internal toughness is good, so self-tapping screws can drill into relatively hard places.