Generally refers to standard parts made of metal, which usually include the following 12 types of parts:
1.Bolts:
A type of fastener consisting of two parts, the head and the screw (cylindrical with an external thread), which is required to cooperate with the nut and is used 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. Studs:
Without the head, only a type of fastener with threads on 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 screw on the nut 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. Screws:
3.It is also a type of fastener composed of two parts of 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 be fitted (this type of connection is called a screw connection and is also a detachable connection; it can also be Fits with a nut for fastening connections between two parts with through holes.) Set screws are used to fix the relative position between two parts. Special-purpose screws such as eyebolts are used for lifting parts.
4. Nuts:
With internally threaded holes, the shape is generally flat hexagonal, cylindrical or flat cylindrical, with bolts, studs or machine screws, used to fasten and connect two parts, making it a piece overall.
5. Self-tapping screws:
Similar to the machine screw, but the thread on the screw is a dedicated 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 Form the corresponding internal thread. This type of connection is also a detachable connection.
6. Wood screws:
It is also similar to a machine screw, but the thread on the screw is a special wood screw thread that can be screwed directly into a wooden member (or part) for use with a metal (or non-metal) part with a through hole and a wooden member Fasten together. This connection is also a detachable connection.
7. Washer;
A type of fastener in the shape of an oblate ring. 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 installed in the axis groove or hole groove of the machine or equipment and plays a role in blocking the left and right movement of the parts on the shaft or hole.
9. Sales:
Mainly for the positioning of parts, and some can also be used to connect parts, fix parts, transmit power or lock other fasteners.
10. Rivets:
A type of fastener consisting of two parts, the head and the shank, is used to fasten the parts (or components) that connect the two through-holes into one 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. Assembly and connection pair:
The assembly refers to a type of fastener that is combined and supplied, such as a certain kind of machine screw (or bolt, self-supply screw) and a flat washer (or spring washer, lock washer) combined supply; A type of fastener supplied by a combination of a nut and a washer, such as a high-strength large hex head bolt connection for a steel structure.
12. Welded nails:
An exotic fastener consisting of a shank and a stud (or no stud) is fixedly attached to a part (or component) by welding so that it can be connected to other parts.