Patent ID: 7066700

Claim:
A self-attaching fastener, comprising: a central pilot portion; an annular flange portion surrounding said pilot portion having a planar end face; and an annular groove in said end face of said flange portion surrounding said pilot portion including a bottom wall, an inner side wall surrounding said pilot portion and an opposed outer side wall, one of said inner and outer side walls of said annular groove inclined toward the other of said inner and outer side walls to define a restricted opening of said annular groove adjacent said end face of said flange portion; said bottom wall of said annular groove including a first plurality of circumferentially spaced radial ant-rotation elements each having a planar radially extending top face spaced above a plane of said bottom wall of said annular groove and a second plurality of circumferentially spaced radial anti-rotation elements each having a planar radially extending top face spaced below said plane of said bottom wall of said annular groove, each of said anti-rotation elements extending from one of said inner side wall and said outer side wall to a location spaced from the other of said inner side wall and said outer side wall.