Drill screw

Details Drill screw Drill screw

B - Operations, Transporting

23

B

77/30

B23B 51/02 (2006.01) F16B 25/00 (2006.01) F16B 25/10 (2006.01)

Patent

CA 1040896

DRILL SCREW ABSTRACT OF THE DISCLOSURE A thread forming screw is disclosed having a pilot-drilling tip in which two longitudinal flutes are provided with generally flat and substantially coplanar radial walls defining side cutting edges. For- wardly inclined end portions of said walls terminate in end cutting edges displaced on opposite sides of said plane. The end cutting edges are backed by substantially flat receding walls. The side cutting edges are backed by convexly curved walls.

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