Patent ID: 8529180

Claim:
A fastener comprising: an elongated shank extending along a longitudinal axis, the shank comprising a first end and a second end; a head portion formed at the first end of the shank, the head portion comprising an annular flange extending radially out from the longitudinal axis, the annular flange having a first diameter; a first section extending along at least a portion of the shank and disposed adjacent to the head portion, the first section having a second diameter, the first diameter being greater than the second diameter; a knurled section extending along at least a portion of the shank and disposed adjacent to the first cylindrical section, the knurled section comprising a plurality of longitudinally extending grooves and peaks disposed around a circumference of the shank; a helical thread portion extending axially along at least a portion of said shank and disposed adjacent to the knurled section; and a second section disposed between the first section and the knurled section, the second section having a third diameter that is less than the second diameter.