The Difference between Flat-head Screws and Sink Screws

First: the contact surface is different, flat head screw and workpiece contact surface for the bit plane, and the sink screw is a bit cone;

Second: the force is different, flat head screw force is greater, and the sink screw is less forced;

Third: the combination of different, flat head screws can be used in this flat gasket combination, and the sink screw can only be used with a tapered gasket combination;

Forth: the use of different, flat head screws can be deep inside the hole, can also be exposed to the outside, and the head screwist is generally only inside the sink hole.