Self-drilling fastener

A self-drilling fastener for fastening a material to a metallic structure comprising:

• fastener body means having a one piece molded construction comprising a head portion and an integral shank axially projecting from said head portion and terminating at a distal end, said head portion comprising a radially extending retaining plate nd torque coupling means for rotatably coupling an applied torque to said head portion comprising an axially extending polygonally shaped first socket having a first maximum diameter, said shank comprising a threaded portion and defining a second socket opening through said distal end, said second socket having a maximum diameter substantially less than said first diameter;
• and
• self-drilling means for tapping into the metallic structure for threadable penetration thereof, said self-drilling means being constructed of a hardened metallic material and comprising a tapered point, an axially extending threaded body having a diameter generally commensurate with the diameter of said shank and extending from said point to a proximal end, and axially extending lug means integrally projecting from said proximal end for close reception in said second socket,
• so that said fastener body means and said self-drilling means are rotatably drivable as a unit upon application of a torque to said torque coupling means.