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 and used to tighten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, it can separate these two parts, so bolt connection is a detachable connection.
2. Stud: A type of fastener without a head and only with external threads on both ends. When connecting, one end must be screwed into the part with an internal threaded hole, and the other end must pass through the part with a through hole, and then the nut must be screwed on, even if these two parts are tightly connected as a whole. This type of connection is called a bolt connection and also belongs to 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 composed of a head and a screw, which can be divided into three categories according to its purpose: machine screws, set screws, and special purpose screws. Machine screws are mainly used for fastening a part with a fixed threaded hole to 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; it can also be used with a nut to fit between two parts with through-holes for fastening connection.) Set 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, it is generally in the shape of a flat hexagonal column, and can also be in the shape of a flat square column or a flat cylindrical shape. It is used in conjunction with bolts, screws, or machine screws to tighten and connect two parts, making them a whole.
5. Self tapping screw: Similar to machine screws, but the thread on the screw is a specialized thread for self tapping screws. Used to tighten and connect two thin metal components into a single piece, small holes need to be made in advance on the components. Due to the high hardness of this type of screw, it can be directly screwed into the holes of the components, forming a corresponding internal thread in the components
6. Wooden screw: Similar to machine screws, but the thread on the screw is a specialized thread for wooden screws, which 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 also belongs to detachable connections.
7. Washers: 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 pressure per unit area, 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: It is installed in the shaft groove or shaft hole groove of a machine or equipment, and plays a role in preventing the left and right movement of parts on the shaft or hole.
9. Sales: mainly used for locating parts left and right, some can also be used for connecting parts, fixing parts, transmitting power, or locking fasteners during the locking period.
10. Rivet: A type of fastener consisting of a head and a nail rod, used to fasten and connect two parts (or components) with holes, making them a whole. This type of connection is called rivet connection, abbreviated as riveting. Belongs to non removable links. Because if two parts connected together are separated, the rivets on the parts must be damaged.
11. Components and connecting pairs: A combination is a type of fastener that is supplied in combination, such as combining a certain machine screw (or bolt, self supplied screw) with a flat washer (or spring washer, lock washer) for supply; Connection pair refers to a type of fastener that combines a specific type of bolt, nut, and washer for supply, such as high-strength large hexagonal head bolt connection pairs used in steel structures.
12. Welding nail: A heterogeneous fastener composed of a nail rod and a nail head (or without a nail head), which is fixed and connected to a part (or component) by welding method for further connection with other parts.