Self Tapping Screws Self-tapping is the ability of a screw to advance when turned, while creating its own thread. This ability is sometimes created by a gap in the continuity of the thread on the screw. These edges cut a thread as the screw is driven into the material. The cutting edge drills away the material, leaving a hole for the screw to go into. Self-tapping screws are used in a variety of applications ranging from DIY to motorcycle build and repair. Our range of self tapping screws are intended for small fixing applications into hard woods, soft woods, plywoods, composite boards, soft plastics, sheet metals etc. As the name suggests, self tappers create there own mating threads as they are applied, to give a vibration resistant assembly.