There is an article that we did on this in our Tech Talk book also
published in Austin Healey Magazine Feb 1996 of which the info came
directly from the grandson of Mr Phillips, the American Screw Comapny
and the Phillips Screw Company.
The phillips screw head was designed to slip at a specific torque.
The pozi screw head was designed not to slip.
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
.
.
On Apr 2, 2009, at 3:42 PM, Ed's Shop wrote:
> <<For Posidriv, look for extra little cross between the normal
> Phillips
> looking "X".>>
>
> And if all else fails<G>, look in the fastener 'hole' and you WILL see
> 4 little teeth.
>
> For those of you not knowing, they were invented for production line
> use as they can be torqued down far better then Phillips.
>
> Ed
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