What kinds of parts are there for fasteners

It usually includes the following 12 types of parts:

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 internal threaded hole, and the other end must be passed 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 uses: 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.

Nut: with internal threaded hole, the shape is generally flat hexagonal column, there are also flat square column or flat cylinder, with bolts, studs or machine screws, used to fasten and connect two parts to make it 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 machine screws, 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 connecting 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.