It usually includes the following 12 types of parts:
1. Bolt: A type of fastener consisting of a head and a screw that needs to cooperate with a nut to fasten two parts with through holes. This type of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
2. Stud: A type of fastener without a head that is threaded at both ends. When connected, one end must be screwed into the part with the internally threaded hole and the other end through the part with the through hole, and then the nut is screwed on even if the two parts are fastened together in one piece. This type of connection is called a stud connection and it is also a detachable connection. It is mainly used for occasions when one of the connected parts has a large thickness, requires a compact structure, or is frequently used for bolting because of frequent disassembly.
3. Screw: It is also a kind of fastener that consists of two parts: the head and the screw. It can be divided into three categories according to the purpose: machine screws, set screws and special purpose screws. The machine screw is mainly used for a part with a tight threaded hole, and a fastening connection with a part with a through hole, and does not require a nut to fit. The set screw is mainly used for fixing the relative position between two parts. Special-purpose screws such as eyebolts are used for lifting parts.
4. Nuts: with internal threaded holes, the shape is generally shown as a flat hexagonal column, there are also flat square cylindrical or flat cylindrical, with bolts, studs or machine screws, used to fasten the connection of two parts, so that It becomes a whole.
5. Self-tapping screws: Similar to machine screws, but the thread on the screw is a special thread for tapping screws. It is used to fasten and connect two thin metal components into a single piece. The small holes need to be made in advance on the components. Because the screws have a high hardness, they can be screwed directly into the holes of the components to make the components Responsive internal threads are formed. This type of connection is also a detachable connection.
6. Wood screws: similar to machine screws, but the thread on the screw is a special wood screw with a rib that can be screwed directly into the wooden member for fastening a metal part with a through hole to a wooden member together. This connection is also a detachable connection.
7. Washer: A type of fastener that is oblate in shape. Placed between the supporting surface of the bolt, screw or nut and the surface of the connecting part, play the role of increasing the contact surface area of the connected parts, reducing the pressure per unit area and protecting the surface of the connected parts from being damaged; another type of elastic gasket, Can also play a role in preventing the nut from loosening.
8. Retaining ring: It is used to install in the shaft groove or hole groove of the machine and equipment, and it acts to block the left and right movement of the part on the shaft or hole.
9. Pin: Mainly used for positioning of parts, and some can also be used for connecting parts, fixing parts, transmitting power or locking other fasteners.
10. Rivets: A type of fastener consisting of a head and a shank that is used to fasten the parts that connect the two through-holes into a single piece. This type of connection is called rivet connection, or simply riveting. Generic and non-detachable connection. Because the two parts that are connected together must be separated, the rivet on the part must be destroyed.
11. Assemblies and couplings: Assemblies refer to a type of fasteners that are supplied in combination, such as the combination of a machine screw and a flat washer; the connecting sub-finger supplies a combination of special bolts, nuts, and washers. Fasteners, such as high-strength large hex head bolts for steel structures.
12. Welded nails: Because of the different types of fasteners made up of light energy and nailheads, they are fixedly attached to one part by welding so that they can be connected to other parts