Patent ID: 6997927

Claim:
A closure for setting engagement with a structural member and comprising: (a) a substantially cylindrical body having an outer cylindrical surface relative to a central closure axis; (b) a substantially continuous guide and advancement flange extending helically about said outer cylindrical surface in a forward advancement direction relative to said closure axis, said flange having a leading surface and a trailing surface relative to said forward advancement direction; (c) at least one of said leading surface or said trailing surface being compound in contour and including an inward anti-splay surface component facing generally toward said closure axis; (d) an installation head for rotating and torquing said body to a preselected torque; and (e) said body having a pair of spaced apertures that intersect with a rear surface of said closure body and that are parallel to and spaced from said closure axis and a radially outer surface of said closure body; said apertures being sized and shaped to be adapted to receive a removal tool for removing said body subsequent to installation.