Pozidriv

Pozidriv

The Pozidriv, referred to as PZ in the Ko-ken catalog.  This screw drive is an improved version of the Phillips drive system. It is jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be an abbreviation of positive drive. Its advantage over Phillips drives is its decreased likelihood to cam out, which allows greater torque to be applied.

Example:

Screen_shot_2011-05-15_at_2.39.27_PM

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