Screw and screw forming tool

Details Screw and screw forming tool Screw and screw forming tool

F - Mech Eng,Light,Heat,Weapons

16

B

85/101, 10/2

F16B 23/00 (2006.01)

Patent

CA 1168908

ABSTRACT OF THE DISCLOSURE The present invention relates to a screw having a star- shaped socket hole in a top surface of the screw head. The star-shaped socket hole has the form of the figure formed by concentric superposition, 45° out of phase, of two equilateral octagons intermediate in configuration between a regular octagon and a square. The screw can sustain high tightening torque values, and reduces the risk of chipping and deformation in the screw head whilst facilitating the fitting of a screwdriver in the socket hole of the screw.

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