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Why do ANSI inch self tapping screw heads have an 80 degree head angle?

Question asked by Mark Tillotson on May 3, 2013

Why do the toolbox ANSI inch self tapping screw heads have an 80 degree head angle? Not only are all the screws I have seen available 82 degrees but this means they won't mate on the conical surface with the ANSI inch counter-sunk screw holes. Also, how would I go about changing this?

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