Semblex Corporation

John Grimsby

Brandt J Ruszkiewicz

Eric C Breidenbaugh

Stephen J Crockett

Chris Norton

A fastener including an elongated shaft extending between first and second shaft ends, with a tip provided at the first shaft end, and a thread region provided between the tip and the second shaft end; and a head with a drive region arranged at the second shaft end. The fastener also incudes a first annular undercut area in an underside surface of the head, where the first annular undercut area is configured and arranged to receive material that has flowed from a substrate during installation of the fastener into the substrate, and a second annular undercut area in the underside surface of the head, where the second annular undercut area is located radially outwardly of the first annular undercut area. Additionally, an annular sealing member is provided within the second annular undercut area, where the annular sealing member makes sealing contact with an upper surface of the substrate.

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Carol Stream, IL, United States of America

John Grimsby