Patent ID: 7641430

Claim:
A fastener assembly installable in an opening of a structural workpiece via a work tool, the fastener assembly comprising: an elongated mandrel having a first end, a second end opposed to the first end, a head section formed proximate the first end, and an engagement section formed proximate the second end, at least a portion of the head section having an outer tapered perimeter formed by a first perimeter tapering down to a second perimeter, and wherein the engagement section is selectively engageable by the work tool; a nut member having a passage formed therein, the passage including a first section and a second section, the first section having a first inner perimeter, the second section having a second inner perimeter that is larger than the first inner perimeter, wherein a transition between the first inner perimeter and the second inner perimeter forms a nut member shoulder; and a retainer having a first section and a second section, the first section of the retainer cooperates with the nut member to capture the head section of the mandrel substantially between the nut member shoulder and a portion of the retainer, such that the head section extends along a longitudinally extending portion of the passage formed by the second section of the nut member until the mandrel is forcibly withdrawn from the retainer, the second section of the retainer includes a second inner perimeter sized to be slightly smaller than the second perimeter of the head section of the mandrel.