Fastener having recess useable with multiple drivers and method of manufacture
A fastener is described having a head formed with a recess which accommodates a square head driver, symmetrical drivers, such as PHILLIPS™ style drivers, asymmetrical style cross head drivers, such as POZIDRIV® style drivers, and combination square and cross drivers without compromising performance of the drivers.
1. A tool for forming a recess, said tool having a working portion extending from a shank to a tip a first distance, said working portion of said tool comprising:
a cross winged portion extending said first distance from said shank to said tip having an overall cross wing outer profile, said wings being formed by adjacent walls, wherein said adjacent walls converge, from said shank to said tip, at a symmetrically formed included angle having an overall size that is substantially equivalent to an included angle of an asymmetrical cross recessed fastener manufactured in conformity with a standard for type Ia fasteners; and
a square portion, having an overall square outer profile, extending a second distance, that is less than said first distance, wherein said overall square outer profile is within said overall cross wing outer profile.
2. A tool for forming a recess, according to claim 1 , wherein said included angle is 2.5 degrees.
3. A tool for forming a recess, according to claim 1 , wherein said adjacent walls are each inclined at an angle of 1.25 degrees to the vertical to cause said convergence.
4. A tool for forming a recess, according to claim 1 , wherein the tool is used to form a recess in the head of a fastener.
5. A tool for forming a recess, according to claim 1 , wherein the tool is used to form a cavity in a die.