US Patent 7112025 Self-attaching nut

A self-attaching nut including a central pilot portion, a flange portion surrounding the pilot portion having an end face including an annular groove in the end face having inclined inner and outer side walls and a plurality of circumferentially spaced radial ribs integral with the outer side wall extending beyond a midportion of the bottom wall, but spaced from the inner side wall. In one embodiment, the top faces of the radial ribs is inclined to adjacent the inner side wall of the annular groove and in another embodiment, the radial inner ends of the ribs are spaced above the plane of the bottom wall and include an inwardly inclined face.