Fasteners, as parts of daily fastening and connection, there are twelve common types, namely: bolts, studs, nuts, screws, self-tapping screws, wood screws, washers, retaining rings, pins, rivets, Welding nails, assemblies and connection pairs.
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The bolt is 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.
The stud has 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.
The nut has an internal threaded hole, and the shape is generally a flat hexagonal column, but also a flat square column or a flat cylinder. With bolts, studs or machine screws, they are used to fasten and connect two parts to make them one. Pieces as a whole.
Screws are also a type of fasteners composed of two parts, a head and a screw. According to their uses, they can be divided into three categories: machine screws, set screws and special purpose screws. The machine screw is mainly used for a tightening threaded hole part, and a fastening connection between a part with a through hole, and no nut is required (this connection form is called a screw connection, which is also a detachable connection; it can also be It is matched with a nut 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.
5. Self-tapping screws
Self-tapping screws are similar to machine screws, but the thread on the screw is a special thread for self-tapping screws. It is used to fasten and connect two thin metal components to make them into a whole component. Small holes need to be made in advance. Because this kind of screw has high hardness, it can be directly screwed into the hole of the component to form a component. Corresponding internal thread. This type of connection is also a detachable connection.
6. Wood screws
Wood screws are also similar to machine screws, but the thread on the screw. 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.
A type of fastener whose gasket shape is an oblate ring. 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 washers, It can also prevent the nut from loosening.
The retaining ring 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.
Pins are mainly used for parts positioning, and some are also used for connecting parts, fixing parts, transmitting power or locking other fasteners.
A rivet is a type of fastener consisting of a head and a nail shaft, which is used to fasten and connect two parts (or components) with through holes to make them into a whole. This connection form is called rivet connection, or riveting for short. Belong to and non-detachable connection. Because to separate the two parts connected together, the rivets on the parts must be broken.
11. Welding nails
Welding nails are 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.
12. Assembly and connection
Assemblies and connection pairs: Assemblies refer to 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); the connection pair refers to A type of fastener supplied with a combination of special bolts, nuts and washers, such as high-strength large hexagon head bolts for steel structures.
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