(6) Wood screw: Similar to a screw, but the thread on the screw is a specialized wood screw thread that can be directly screwed into a wooden component (or part) 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.

As shown in the following figure:

(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.

As shown in the following figure:

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

As shown in the following figure:

(9) Sales: Mainly used for component positioning, some can also be used for component connection, fixing components, transmitting power, or locking other fasteners.

As shown in the following figure:

(10) Rivet: A type of fastener consisting of a head and a shank, used to fasten and connect two parts (or components) with through holes, making them a whole. This type of connection is called rivet connection, abbreviated as riveting. Belongs to non removable connections. Because in order to separate the two connected parts, it is necessary to break the rivets on the parts.

As shown in the following figure:

(11) Combination components and connecting pairs: Combination components refer to 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 combines a specific type of bolt, nut, and washer, such as a high-strength large hexagonal head bolt connecting pair used in steel structures.

As shown in the following figure:

(12) Welding nail: A heterogeneous fastener composed of a bare rod and a nail head (or no nail head), which is fixed and connected to a part (or component) by welding method for further connection with other parts.

As shown in the following figure: