Threaded fastener
AssigneeIllinois Tool Works Inc.
InventorsMark Offenburger, Eric Parker, Frank Ptak
Life of this patent
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Abstract
A compositely plated, threaded fastener has zinc plating applied to a threaded fastener core and an aluminum plating is applied to the zinc underplating. Optionally, a polymeric top coat can be applied to the aluminum plating for pigmented appearance. The combination of the composite aluminum and zinc platings not only provide the fasteners with improved corrosion resistance but also provide particularly reduced torque load in driving such fasteners, for example, in drilling applications.
Claims9
A threaded fastener having improved driving performance for corrosion-resistant securement of one or more metallic work pieces, said fastener comprising:
- a drive head;
- and a composite threaded shank comprising a threaded inner core;
- a zinc plating applied to said core;
- and an aluminum plating applied on said zinc plating, to promote lubricity in driving said shank into said work pieces.
Dependencies are inferred from the claim text.