Self-tapping screws

Details Self-tapping screws Self-tapping screws

F - Mech Eng,Light,Heat,Weapons

16

B

85/110

F16B 25/00 (2006.01)

Patent

CA 1091965

ABSTRACT OF THE DISCLOSURE A threaded fastener of the self-tapping type is described having the conventional head, shank and pilot end. The shank includes a helical thread which has been reinforced by a deposit of, usually accompanied by impregnation with, a carbide or other substance harder than the metal from which the fastener is made. A thread-cutting fastener, having its pilot end reinforced in this manner is also described. A thread-rolling machine combined with electrode-deposition equipment is disclosed. The electrode of the equipment is caused to engage the fastener during a produc- tion phase immediately following the thread-rolling operation itself. A method of manufacturing or forming the threaded fastener is described whereby a tough, ductile fastener is pro- duced having superior self-tapping characteristics.

280378

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