THREADED SCREW FASTENER CHARACTERIZED BY HIGH PULL-OUT RESISTANCE, REDUCED INSTALLATION TORQUE, AND UNIQUE HEAD STRUCTURE AND DRIVE SOCKET IMPLEMENT OR TOOL THEREFOR

摘要

A threaded screw fastener is provided with a headportion that has integrally incorporated therein dual drivestructure whereby the single threaded screw fastener can berotatably driven by alternative rotary drive socket implementsor tools, such as, for example, hexagonally configuredor Phillips head configured drive tools or implements, or acombination drive tool. A drive socket implement or tool alsohas integrally incorporated therein both hexagonally configureddrive structure, Phillips head drive structure, and domedcontour structure for not only structurally engaging boththe hexagonally configured structure and the Phillips headstructure integrally incorporated upon the head portion ofthe threaded screw fastener, but in addition, accommodatesthe low profile domed structure of the head portion of thethreaded screw fastener. Lastly, the threaded screw fasteneralso comprises thread structure wherein each thread of thethreaded screw fastener comprises rearward and forward flanksurfaces which effectively serve to simultaneously enhancethe pull-out resistance characteristics ar properties of thethreaded screw fastener while reducing the installation orinsertion torque characteristics or properties of the threadedscrew fastener.