Patent ID: 6851904

Claim:
A self-attaching female fastener, comprising: an annular pilot portion having a bore extending through an annular planar end face of said pilot portion; an annular flange portion surrounding said pilot portion having a generally planar annular bearing face generally parallel to a plane of said annular planar end face of amid pilot portion; an annular groove in said planar annular bearing face of said flange portion surrounding said pilot portion including an annular bottom wall, an inner aide wall and an 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 defining a restricted opening at said annular bearing face of said flange portion; a plurality of circumferentially spaced radial protrusions projecting from said bottom wall and integral with one of said inner and outer side walls of said annular groove each having a planar radial top face inclined toward said bottom wall; and a plurality of circumferentially spaced channel-shaped recesses in said outer wall of said annular groove spaced between said circumferentially spaced radial protrusions.