SELF-LOCKING THREADED FASTENERS

摘要

A self-locking threaded fastener such as a screw in which locking action is obtained from at least one locking zone, parts of two adjacent turns leaning toward each other and including between them a groove of reduced thread angle. The threads on the product are advantageously formed by rolling with novel dies including a lock forming area in which normal internal support for the flanks of developing thread ridges are removed during the latter part of the thread-rolling operation thereby causing the pressure applied to external flanks to result in leaning of the locking turn portions toward each other.