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Flat-head flat-shank bolts are one type; they are designed for bolt heads. As the name suggests, the head of a flat-head bolt is definitely flat, while its shank is conical. In contrast, the shank of a flat-shank bolt is flat, and its head is round. A countersunk head means that the position where the bolt is screwed in is recessed. Screw is a general term for fasteners, used in everyday conversation. Screws are essential industrial items in daily life: very small screws are used in cameras, glasses, clocks, electronics, and so on ； Televisions, electrical appliances, musical instruments, furniture, etc. use ordinary screws ； As for engineering, construction, and bridges, large screws and nuts are used ； For transportation devices such as airplanes, trams, and cars, both large and small screws are used. Jingbo Cloud Commerce will tell you the differences between these two types of screws: 1. Their shapes are different. The contact surface between a flat-head screw and the workpiece is flat, whereas that of a countersunk screw is conical. 2. Flat-head screws can withstand greater forces than countersunk screws. 3. Flat-head screws can be fitted with flat washers or spring washers, while countersunk screws can only be fitted with tapered washers. 4. Flat-head screws can be left exposed or sunk inside the hole, while countersunk screws can only be sunk inside the hole.