Doesn't cam out!
Date posted: 29/08/2015 13:46
Product: Square Lok Countersunk Screw Bright Zinc Plated 10 x 1 Inch
Phillips/Posi always manage to cam out. Why do you think some merchants have goldfish bowls full of Posi bits on the counter? The original Phillips was DESIGNED to cam-out (to avoid being driven too hard into thin metal). The Posi only partly remedies that. Even slotted heads are less likely to cam out.
Square-Lok, or Robinson (after its Canadian inventor) head as it's is more correctly known has a very shallow taper and NEVER cams out. Most builders think Robertson head are only for plumbers - not correct. The main drawback is lack of variety. Torx is as good but is a little more fragile, and also suffers from lack of variety.
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