Importance

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Abstract

Fasteners and fastening devices made of metals, metal alloys, hard high strength ceramic material and the combination of same, are provided wherein all, a select portion or portions of the fasteners are coated with a thin layer or film of synthetic diamond material which is operable to enhance their strength and surface characteristics, insulating ability and resistance to heat and chemical corrosion attack. In one form, a machine screw is totally coated with a thin layer or film of synthetic diamond material. In another form, a select portion of the fastener is so coated. A thin coating of chromium or other suitable solid material is deposited on the outer surface of the diamond coating to protect same against physical attrition during its application and use. In another form, just the threads of machine screws and the like are diamond coated to protect same against corrosion. In a third form, a machine nut is entirely coated with synthetic diamond material which may contain a coating of chromium or the like deposited on the outer surface of the diamond material. In a fourth form, just the threads of such a machine nut are so coated. Other forms of the invention include improved fasteners in the form of pins and non-threaded bolts or the like which are totally or partially coated with synthetic diamond material and, in such instances, overcoated with a thin plating of chromium.

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First Claim