Patent ID: 6176664
Filing Date: 2001-01-23
Classification: B21H,F16B

Abstract:
A fastening screw for fastening metal sheet to timber comprising an elongate shank, and a drilling tip and a head provided at respective opposite ends of said shank, said shank tapering to said drilling tip, said drilling tip having a pair of cutting edges disposed on opposite sides of the longitudinal axis of said shank that define a functional cutting edge structured for cutting through metal sheet, and flutes respectively extending longitudinally of said shank from each of said cutting edges, a thread being formed on said shank and extending from adjacent said drilling tip rearwardly to beyond the section of the shank in which said flutes are formed, wherein the drilling tip terminates in a pair of sloping end surfaces intersecting each other at a tip end in the form of a linear intersection extending perpendicular to a longitudinal axis of the shank, each cutting edge of one flute terminating at a point at a lowermost extent thereof, said points establishing opposite ends of the linear intersection.