Patent ID: 7033122

Claim:
A fastener for securing a work piece to a metal substrate with a power tool comprising: an elongated body having first and second surfaces and including a point for penetrating said work piece and said substrate and having a width and a thickness dimension defined by said first and second surfaces and an outer edge; a securing member carried by said body; said first and second surfaces being devoid of protrusions extending outwardly therefrom, at least along that portion thereof between said point and said securing member which penetrates said substrate; a head at one end of said body disposed at a substantially right angle to said body for use in driving said fastener through said work piece and said substrate; said thickness dimension of said body being greater proximate said head than proximate said point; a first stamped stiffening groove disposed at a transition between said body and said head and extending from said transition along said body and said head; and said body being coined adjacent to but displaced from said outer edges of said body and said stamped stiffening groove extends along said body for a distance to overlap said coining.