Patent ID: 6890139
Filing Date: 2005-05-10
Classification: B25B,F16B

Abstract:
1. A fastener having a recess constructed in a head thereof for receiving a driver in torque transmitting engagement, said recess comprising: a cross slotted portion, extending downward a first distance from a top to a bottom of said recess, said slots being formed by opposing walls, wherein said opposing walls converge symmetrically, from said top to said bottom, at a symmetrically formed included angle having an overall size that is substantially equivalent to an included angle of 2.5 degrees said recess being manufactured in conformity with a standard for type Ia fasteners; and a square portion, defined by substantially vertical surfaces constructed to extend between said opposing walls of said slots, said square portion extending from said top of said recess downward a second distance that is less than said first distance.