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Fasteners are a type of mechanical parts that are used for fastening connections and are extremely widely used. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, etc., in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments All kinds of fasteners can be seen on, chemicals, instruments and supplies, etc., which are the most widely used mechanical basic parts. It is characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people call a type of fasteners that have national standards as standard fasteners, or simply standard parts.

Fastener available from Ding Fastener

Fasteners types

Bolt: A type of fastener consisting of a head and a screw (cylinder with external thread). It 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.

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 internally 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.

Screws: It is also a type of fasteners composed of two parts, a head and a screw, which can be divided into three categories according to their use: 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 apart 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; it can also be Cooperate with the nut, used for the fastening connection between two parts with through holes.) The set screw is mainly used to fix the relative position between the two parts. Special purpose screws such as eyebolts are used for lifting parts.

Nut: with an internally threaded hole, the shape is generally a flat hexagonal column, there are also flat square columns or flat cylinders, bolts, studs, or machine screws, used to fasten the connection of two parts, making it into One piece whole.

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

Wood screw: It is also similar to a machine screw, but the thread on the screw is a special wood screw thread, which can be directly screwed into the wooden component (or part) to connect a metal (or non-metal) part with a through-hole with A wooden component is firmly connected together. This connection is also a detachable connection.

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 connected parts, which increases the contact surface area of ​​the 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.

Retaining ring: It is installed in the shaft groove or shaft 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.

Pins: Mainly used for positioning the left and right parts, and some can also be used for connecting parts, fixing parts, transmitting power, or fasteners during lock-in period.

Rivet: A type of fastener composed of two parts, a head and a nail shaft, used to fasten and connect two parts (or components) with holes to make them into a whole. This type of connection is called rivet connection, or riveting for short. It is a non-detachable link. Because if the two parts connected together are separated, the rivets on the parts must be broken.

Components and connection pairs: Assemblies are a type of fasteners supplied in combination, such as a combination of machine screws (or bolts, self-supplied screws) and flat washers (or spring washers, lock washers); A type of fasteners supplied by a combination of special bolts, nuts and washers, such as high-strength large hexagon head bolt connections for steel structures.

Welding nails: heterogeneous fasteners composed of nail rods and nail heads (or no nail heads), which are fixedly connected to a part (or component) by welding so as to be connected with other parts.