What are the differences between flat head screw and countersunk head screw?

The screw is a tool to tighten the machine parts step by step by using the physical and mathematical principles of the oblique circular rotation and friction of the object. Screw is a general term for fasteners, which is spoken daily. Screws are indispensable industrial necessities in daily life: such as minimal screws used in cameras, glasses, clocks and watches, electronics and so on; general screws used in TV, electrical products, musical instruments and furniture; large screws and nuts used in engineering, construction and bridges; and large screws used in transportation equipment, aircraft, trams and automobiles. Use both small screws.

1. Different shapes! Flat head screw and workpiece contact plane, and countersunk head screw position conical surface!

2. The force of flat head screw can be larger than that of countersunk head screw.

3. Flat head screw can flatten gasket cushion while countersunk head screw can only add gasket with taper.

4. Flat head screw can be exposed outside or in sinking hole, and sinking head screw is usually only in sinking hole!