Tapping screw

Details Tapping screw Tapping screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/10 (2006.01) F16B 25/00 (2006.01)

Patent

CA 2582546

A tapping screw is disclosed for use in composite wood material. The tapping screw includes wings extending radially outward from the screw shank. As the winged screw is driven down into a composite wood material, the wings shear off the composite material and granulate the composite material with which the wings come into contact. As the granulated material moves upward along the shank, when the screw head enters the composite material, the granulated material at the top of the screw bore is forced out of the screw bore and is removed. The counterbore created by the wings prevents the formation of an annular ring at the surface and allows the screw head to be countersunk into the composite material.

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