1. Different fastening tools
Screws generally use screwdriver tools, and bolts generally use wrench tools.
2. Different fastening methods
Bolts are generally used in conjunction with nuts or screwed into the machined bolt holes. In addition to these two methods, there are self-tapping screws, which are directly screwed into the workpiece with relatively soft material without processing the bolt hole.
3. Different appearance
The head of the screw is generally flush with the surface of the workpiece. Those bolts that are not self-tapping should also be processed with a bevel on the surface of the workpiece to make the screw head flush with the surface of the workpiece. The head of the bolt is generally adapted to the shape of the tool, such as hexagonal bolts and hexagon socket bolts. The heads are exposed outside the workpiece. To make the surface of the workpiece flat, it is necessary to drive the hollow and use the hexagon socket bolt.
4. Different structure
Screws: A type of fasteners composed of two parts, the head and the screw, can be divided into three categories according to the purpose-machine screws, set screws, special purpose screws.
Bolts: a type of fastener composed of two parts: head and screw (the screw here only refers to the threaded part, and the drive screw is not a concept at all). It needs to be matched with a nut to fasten and connect two Through-hole parts.