FASTENING SCREW AND METHOD OF FORMING SAME

摘要

A fastening screw having an elongate shank (1), and a drilling tip (2) and a hea d (3) provided at respective opposite ends of the shank (1). The drilling tip (2) has a cutting edge (5) for cutting through metal and a flute (6) extending longitudinally of t he shank (1). A thread (8) is formed on the shank (1 ) and extends over a portion of the section of the shank (1) in which the flute (6) is formed. A method of forming a fasteni ng screw from a screw preform (9), includes deforming the preform (9) to create a d rilling tip (2) which has at least one cutting edge (5) and a flute (6), and applying a thread (8) to the shank (1) in the region in which the flute (6) is formed.