Screw has one or more sharp edges at lower end of shank between third and fourth thread and in vertical or slightly angled position to make angled or planar incision when screw is screwed in

摘要

The shank (1) of the screw has a thread with quadratically designed edges (12). The lower end of the screw shank between the third and fourth thread has one or more sharp edges (13) in elongated form and in a vertical or slightly angled position, and provided along the shank, so as to make an angled or planar incision by which the friction is significantly reduced when turning in of the screw.