Patent ID: 6789989
Filing Date: 2004-09-14
Classification: F16B

Abstract:
An integrally formed screw having a circular head including a peripheral rim and a stem which includes a thread formed in at least a part thereof;(a) the stem having a root end, and an opposed free end portion; (b) the head including a top surface portion facing away from the stem and including a screwdriverengaging recess; and an annular underside disposed about the root end of the stem; (c) the underside defining a shallowly concave annular portion co-axial with said stem and slightly decreasing in depth in the radial direction toward said rim; (d) the screwdriver engaging recess extending through the head and into the root end of the stem, the root end of the stem having a reinforced portion with sufficient diameter to substantially resist shear forces in the screwdriver engaging recess portion of the stem.