Fasteners generally include the following 13 categories of parts:
Bolt: A type of fastener consisting of a head and a screw (a cylinder with an external thread), which needs to be matched with a nut to fasten and connect two parts through holes. This form of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
Stud: A type of fastener that has no head and only has external threads on both ends. When connecting, one end of it must be screwed into the part with the internally threaded hole, the other end must pass through the part with the through hole, and then the nut must be screwed on, even if the two parts are tightly connected as a whole. This form of connection is called a stud connection, which is also a detachable connection. It is mainly used for occasions where one of the connected parts is thick, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly.
Screw: It is also a type of fastener consisting of a head and a screw. It can be divided into three categories according to its purpose: machine screws, set screws, and special-purpose screws. Machine screws are mainly used for a fastened connection between a part with a fixed threaded hole and a part with a through the hole, without the need for nut matching (this connection form is called screw connection, which is also a detachable connection; it can also be Cooperate with the nut, it is used for the fast 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 hoisting parts.
Nut: with internally threaded holes, generally in the shape of a flat hexagonal cylindrical shape, but also in a flat square cylindrical shape or flat cylindrical shape, with bolts, studs, or machine screws, used to fasten and connect two parts, making it a whole.
Self-tapping screw: Similar to a machine screw, the thread on the screw is a special thread for the self-tapping screw. It is used to fasten and connect two thin metal components to make them a whole. Small holes need to be made in advance on the components. Due to the high hardness of this kind of screw, it can be directly screwed into the hole of the component, so that the Forming a responsive internal thread
Wood screws: It is also similar to machine screws, but the thread on the screw is a special thread for wood screws, which can be directly screwed into wooden components (or parts), and used to connect a metal (or non-metal) with a through the hole. The parts are fastened together with a wooden element. This connection is also a detachable connection.
Washers: A type of fastener with an oblate ring shape. It is placed between the supporting surface of the bolt, screw, or nut and the surface of the connecting part, 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.
Retaining ring: for installation in the shaft groove or hole groove of the machine and equipment, it plays the role of preventing the parts on the shaft or the hole from moving left and right.
Pins: mainly used for parts positioning, and some can also be used to connect parts, fix parts, transmit power or lock other fasteners.
Rivet: A type of fastener consisting of a head and a nail rod, used to fasten and connect two parts (or components) through holes to make them a whole. This form of connection is called rivet connection, or riveting for short. It belongs to the non-detachable connection. Because to separate the two parts that are joined together, the rivets on the parts must be broken.
Assemblies and connection pairs: Assemblies refer to a type of fasteners supplied in combination, such as a combination supply of certain machine screws (or bolts, self-supplied screws) and flat washers (or spring washers, lock washers); connection Secondary refers to a class of fasteners supplied with a combination of special bolts, nuts, and washers
Welding nails: Due to the heterogeneous fasteners composed of light energy and nail heads (or no nail heads), they are fixed and connected to a part (or component) by welding so as to be connected with other parts.
Wire threaded insert: Wire threaded insert is a new type of threaded connection element, which is refined from high-strength, high-precision corrosion-resistant diamond wire. Shaped like a spring, it is installed in a specific screw hole in the base body, and its inner surface forms a standard thread. When matched with a screw (bolt), it can significantly improve the strength and wear resistance of the threaded connection; especially in low-strength aluminum, magnesium, cast iron, plastic, etc. on the material. The locking type is to add one or several locking rings on the basis of the ordinary type. Xinxiang Yongda Industrial Co., Ltd. is a manufacturer specializing in the production of wire screw inserts. It is recommended that the wire screw inserts be embedded in the threads of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, glass fiber reinforced plastic, and plastic to form standard M and MJ threads. Continuous strength, impact resistance and wear resistance, and can disperse the stress to protect the base thread, greatly extending the service life of the base. At the same time, the force of the thread is improved, an elastic connection is formed, the pitch and tooth half angle error between the inner and outer threads are eliminated, the load on the thread is evenly distributed, and the base thread is protected from damage, and the service life is prolonged.
