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(Or head sizes of 5mm vs 6.4mm if you prefer.)<BR><BR>A typical flathead screw has a head diameter of 0.25", and while that 0.05" difference might not sound like much, it makes all the difference ...
Why the Phillips Head Is Superior Phillips was so enthusiastic about his design because the screw could be self-centered. As anyone who has driven in a flathead screw can testify, slotted screws ...