Patent ID: 6616391
Filing Date: 2003-09-09
Classification: F16B

Abstract:
A fastener for fastening plastic lumber to a structural member comprising:a head having a periphery, an underside defining a circumferential v-shaped undercut surrounding said shank, a circumferential lip defined by the junction of a radially outward portion of said underside with said periphery and a socket for receiving a torque applied thereto, said circumferential lip comprising a series of notches defining cutting teeth configured to cut in a direction of screw rotation during installation; and a shank comprising an unthreaded portion axially extending from said head, a threaded portion axially extending from a tip toward said head, said threaded portion including at least one helical thread, and a boring portion disposed between said threaded and unthreaded portions, said boring portion including at least one radially projecting helical flute, wherein said helical flute has an opposite helical orientation to a helical orientation of said at least one helical thread.