Bolt: A type of fastener consisting of a head and a screw (cylinder with external thread), which needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection can be detachably connected.
Screw: It is a type of fastener composed of two parts: head and screw. According to the purpose, it can be divided into three categories-machine screws, set screws and special purpose screws.
A bolt is used to connect two objects, usually through a light hole, and needs to be used in conjunction with a nut. A single bolt cannot connect. A wrench is generally used as a tool. The heads are mostly hexagonal heads, etc., generally larger.
Screws usually don’t need nuts, they are directly matched with two objects (generally, the connecting piece needs to be drilled and tapped). The tool is usually a screwdriver (screwdriver). Generally small.
Bolts and screws are used in different places. Bolts do not require high precision. Unless there is a matching requirement, bolts are generally easy to disassemble, have low machining accuracy, and are not limited by connecting materials. They are widely used. Bolts that require matching can withstand transverse directions. Load. The screws are compact in structure, but cannot be disassembled frequently and cannot withstand large forces.