Gewindeformendes Schraubenbefestigungselement.

摘要

A blank and fastener formed from the blank for a thread-forming fastener which provides axially aligned driving. A tip portion (24) of the blank is formed in a conical shape at an oblique angle (30) to the shank portion (22) of the blank. The blank formed as such is then formed with threads (50), however, the tip portion (24) is formed with threads (58) only about a portion of its outer surface (42). The resulting threaded fastener forms threads on an inside surface of a pilot hole in a workpiece in which it is inserted. The threaded fastener so formed minimizes driving effort and maintains proper alignment when the fastener is initially inserted and driven into an unthreaded pilot hole in a workpiece and also prevents cross-threading when the fastener is removed and reinserted into the workpiece.