Pressure rivet nut, also called rivet nut, self-fastening nut, is a nut used on thin plates or sheet metal. It is round in shape and has embossed teeth and guide grooves on one end. The principle is to press into the preset hole position of the sheet metal through embossed teeth. Generally speaking, the aperture of the preset hole is slightly smaller than the embossed teeth of the rivet nut. The teeth of the rivet nut are squeezed into the plate through pressure to make the preset hole position. Plastic deformation occurs around the hole, and the deformed object is squeezed into the guide groove, thereby producing a locking effect.

There is also a wide range of different nut types in fasteners, including wing, acorn, hex, flange, castle, and jam. Wing nuts are designed to be easily turned and installed by hand. Cage nuts have slots in the top for low-torque applications such as retaining wheel bearings. Hexagonal nuts are usually connected to hexagonal head bolts and tightened with a wrench.

The combination bolt refers to a three-assembly assembly consisting of an external hexagonal bolt, a spring washer and a flat washer, which are fastened together with threaded threads. Combination bolts are also called external hexagonal combination screws, also called hexagonal combination bolts.

Wood screws are similar to machine screws, but the threads on the screw rod are special wood screw threads, which can be screwed directly into wooden components (or parts) and are used to connect a metal (or non-metal) part with a through hole to a wooden The components are tightly connected together. This connection is also a detachable connection.

The hexagonal flange nut mainly includes a nut body, a flange surface is fixed at one end of the nut body, and a cap is fixed at the other end of the nut body. Has good sealing and anti-corrosion properties.

It is generally a flat structure, used to protect the surface of the connected parts from being scratched by the nut, and to disperse the pressure of the nut from the connecting parts.

1. Spring washer anti-loosening: The material of the spring washer is spring steel. After assembly, the washer is flattened. Its rebound force can maintain the compression force and friction between the threads, thereby achieving anti-loosening. 2. Anti-loosening of the jacking nut: The jacking effect of the nut is used to cause the bolt to receive additional tension and additional friction. 3. Self-locking nut to prevent loosening: One end of the nut is made into a non-circular closing or a radial closing after opening. When the nut is tightened, the closing opening expands, and the elastic force of the closing opening is used to compress the screwed threads. This kind of anti-loosening structure is simple, reliable and can be disassembled and assembled multiple times without reducing the anti-loosening performance.