Drill tip and fastener employing same

Details Drill tip and fastener employing same Drill tip and fastener employing same

F - Mech Eng,Light,Heat,Weapons

16

B

85/108

F16B 25/00 (2006.01)

Patent

CA 1251348

Abstract of the Disclosure A drill screw having primary and secondary cut- ting edges on opposite sides of its longitudinal axis, with the primary cutting edge offset so that it contacts the work-piece first, at a position displaced laterally from the screw axis, and produces initial very rapid drill- ing of an opening through the work-piece, followed by a period of drilling by both cutting edges. A conical portion is also preferably provided on the screw which extends divergingly from the cutting edges toward the head end of the screw until its diameter matches the root diameter of the screw.

476754

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