Hexagonal non-standard screws are also called blind rivet nuts, pull caps, instant pull caps. They are used in the fastening fields of various metal sheets, pipes and other manufacturing industries. They are widely used in automobiles, aviation, railways, refrigeration, elevators, switches, and instruments. , Furniture, decoration and other electromechanical and light industrial products assembly. It was developed to solve the shortcomings of thin metal plate and thin tube welding nuts, such as easy melting, easy welding deformation of the base material, easy slipping of internal threads when tapping.
The use of non-standard screws If the nut of a product needs to be installed on the outside, and the space inside is small, the indenter of the sub riveting machine cannot be entered for pressure riveting and the method of sprouting cannot meet the strength requirements, then pressure riveting and expansion Riveting is not feasible. Blind riveting must be used. It is suitable for the fastening field of various thickness plates and pipes (0.5MM-6MM) . The use of pneumatic or manual riveting gun can be riveted at one time, which is convenient and firm ; it replaces the traditional welding nut to make up for the shortcomings of thin metal plate, thin tube welding, and welding nut is not smooth.
4 Structural rivet nuts are mainly used in non-structural bearing bolt connections, such as the connection of interior parts such as rail passenger cars, highway buses, and boats. The improved rivet nuts that can prevent spin are more excellent than the pallet nuts for aircraft. The advantages are lighter weight, no need to fix the pallet nuts with rivets in advance, and the back of the substrate can still be used without operating space.
The specifications of rivet nuts in the national standard are M3, M4, M5, M6, M8, M10, and M12 . In fact, M6 and M8 are recommended , because small threads can be directly tapped on the base material. If the threads are large, the weight of the bolt will increase greatly. The increase in connection strength is limited, that is, the matching is unreasonable.
