Introduction to 12 classifications of stamping fasteners

Fasteners are also called standard parts in the market. They are a general term for a class of mechanical parts used when two or more parts (or components) are fastened and connected into a whole. Fasteners include 12 categories:

　　1. Rivet: It is composed of two parts, a rivet shell and a rod, which is used to fasten and connect two plates with through holes to achieve the effect of being a whole. This type of connection is called rivet connection, or riveting for short. Riveting is a non-detachable connection, because to separate the two parts connected together, the rivets on the parts must be broken.

　　2. Bolt: A type of fastener consisting of two parts, 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 is a detachable connection.

　　3. Stud: There is no head, only a type of fastener with threads on both ends. When connecting, one end of it must be screwed into the part with internal threaded hole, the other end must pass through the part with through hole, and then the nut is screwed on, even if the two parts are tightly connected as a whole. This type of connection is called a stud connection, which is also a detachable connection. It is mainly used where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly. (Guide: Design principle and design process of control system of nut tightening machine)

　　4. Nut: with internal threaded hole, the shape is generally flat hexagonal cylinder, there are also flat square cylinder or flat cylinder, with bolts, studs or machine screws, used to fasten the connection of two Parts to make it a whole.

　　5. Screw: It is also 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. Machine screws are mainly used for a tightening connection between a part with a threaded hole and a part with a through hole, without the need for a nut to fit (this type of connection is called a screw connection, which is also a detachable connection; Cooperate with nut, used for fastening connection between two parts with through holes.) Set screw is mainly used to fix the relative position between two parts. Special purpose screws such as eyebolts are used for lifting parts.

　　 6. Self-tapping screws: similar to machine screws, but the thread on the screw is a special self-tapping screw thread. It is used to fasten and connect two thin metal components into one piece. Small holes need to be made in the component in advance. Because this kind of screw has high hardness, it can be directly screwed into the hole of the component. Form a responsive internal thread. This type of connection is also a detachable connection.

　　7. Welding nails: Because of the heterogeneous fasteners composed of light energy and nail heads (or no nail heads), they are fixedly connected to a part (or component) by welding so as to be connected with other parts. .

　　8. Wood screws: similar to machine screws, but the thread on the screw is a special rib for wood screws, which can be screwed directly into the wooden components (or parts), used to connect a metal with a through hole (or Non-metallic) parts are firmly connected to a wooden component. This connection is also a detachable connection.

　　9. Washer: A type of fastener with an oblate ring shape. It is placed between the supporting surface of bolts, screws or nuts and the surface of the connecting parts, which increases the contact surface area of u200bu200bthe connected parts, reduces the pressure per unit area and protects the surface of the connected parts from damage; another type of elastic washer, It can also play a role in preventing the nut from loosening.

　　10. Retaining ring: It is installed in the shaft groove or hole groove of the machine and equipment, and plays the role of preventing the parts on the shaft or hole from moving left and right.

　　11. Pin: Mainly used for parts positioning, and some can also be used for connecting parts, fixing parts, transmitting power or locking other fasteners.

　　12. Assemblies and connection pairs: Assemblies refer to a type of fastener supplied in combination, such as combining a certain machine screw (or bolt, self-supplied screw) with a flat washer (or spring washer, lock washer) Supply; connection pair refers to a type of fastener supplied by a combination of a certain special bolt, nut and washer, such as a high-strength large hexagon head bolt connection pair for steel structures.

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