Typically, flat head screws are flat on top and tapered underneath. When used with a countersink hole, the head of the screw sets into the material you're fastening, so that none of the head ...

(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 ...