Patent ID: 8021091

Claim:
A captive clinch nut for rotatable attachment to an apertured sheet, comprising: a nut body having an axial threaded bore; a first friction-bearing surface on a base of said nut body; an annular displacer collar unitary with said nut body located directly below said friction-bearing surface, the displacer collar downwardly and inwardly tapered along at least a portion of its outside surface and having an outside diameter substantially less than an outside diameter of said first friction-bearing surface, and a second friction-bearing surface on a bottom side of said displacer collar parallel to and below said first friction-bearing surface; a neck of a shank immediately adjacent said displacer,-said neck having an outside diameter less than the outside diameter of said displacer; the shank being rigid, tubular and substantially non-deformable in its unattached free state prior to assembly, unitary with said nut body, and coaxially extending from said neck, said shank being outwardly flared toward a distal end along its entire length; and an undercut between said shank and said displacer, said undercut adapted to receive only a partial cold flow of metal of said sheet.