What types of fasteners are included

1、 What is a fastener? A fastener is a general term for a type of mechanical component used to fasten two or more parts (or components) together to form a whole. Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemical, metallurgical, mold, hydraulic, and more. They can be found in various types of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments, and supplies, and are widely used as mechanical basic components. Its characteristics are a wide variety of specifications, diverse performance and applications, and a high degree of standardization, serialization, and generalization. Therefore, some people also refer to a type of fastener that already has national standards as standard fasteners, or simply as standard components

2. What are the types of fasteners?

Fasteners usually include the following 12 types of parts:

1、 Bolt: A type of fastener consisting of a head and a screw (a cylindrical body with external threads), which needs to be matched with a nut to securely connect two parts with through holes. This type of connection is called bolted connection. If the nut is unscrewed from the bolt, it can separate these two parts, so the bolt connection is a detachable connection

2、 Stud: A type of fastener that does not have a head and has external threads on both ends. When connecting, one end needs to be screwed into the part with an internal threaded hole, and the other end needs to pass through the part with a through-hole, and then screw on the nut, even if these two parts are tightly connected as a whole. This type of connection is called a bolted connection and is also a detachable connection. Mainly used in situations 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

3、 Screw: It is also a type of fastener consisting of 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 fastening connections between a part with a threaded hole and a part with a through-hole, without the need for nut fitting (this type of connection is called a screw connection, which is also a detachable connection; it can also be used in conjunction with a nut for fastening connections between two parts with through-hole). Tightening screws are mainly used to fix the relative position between two parts. Special purpose screws such as lifting ring screws are used for lifting parts

4、 Nut: with internal threaded holes, generally in the shape of a flat hexagonal column, but also in the shape of a flat square column or a flat cylindrical shape, used in conjunction with bolts, screws or machine screws to fasten and connect two parts into a whole

5、 Self tapping screw: Similar to machine screws, but with a one-to-one thread on the screw for self tapping screws. Used to fasten and connect two thin metal components into a single unit, small holes need to be pre made on the components. Due to the high hardness of these screws, they can be directly screwed into the holes of the components to form responsive internal threads

6、 Wood screws: Similar to machine screws, but with a one-to-one thread on the screw, wood screws can be directly screwed into wooden components (or parts) to securely connect a metal (or non-metal) part with a through-hole to a wooden component. This type of connection is also a detachable connection

7、 Gasket: A type of fastener with a flat circular shape. Placed between the support surface of bolts, screws or nuts and the surface of the connecting parts, it plays a role in increasing the contact surface area of the connected parts, reducing the unit area pressure, and protecting the surface of the connected parts from damage; Another type of elastic washer can also prevent the nut from loosening

8、 Retaining ring: Used to be installed in the shaft groove or shaft hole groove of machines or equipment, it plays a role in preventing the parts on the shaft or hole from moving left and right

9、 Sales: Mainly used for positioning parts left and right, some can also be used for connecting parts, fixing parts, transmitting power, or locking fasteners

10、 Rivet: A type of fastener consisting of a head and a shank, used to fasten and connect two perforated parts (or components) into a single piece. This type of connection is called rivet connection, abbreviated as riveting. Belongs to non removable links. Because if two connected parts are separated, it is necessary to break the rivets on the parts

11、 Components and connection pairs: Components are a type of fastener supplied in combination, such as a machine screw (or bolt, self supplied screw) supplied in combination with a flat washer (or spring washer, locking washer); A connecting pair refers to a type of fastener that is supplied in a one-to-one combination of bolts, nuts, and washers, such as a high-strength hexagonal head bolt connecting pair used in steel structures

12、 Welding nail: A heterogeneous fastener composed of a nail rod and a nail head (or no nail head), which is welded to fix other parts (or components) to one another for connection with other parts