Rivet nut is a kind of nut applied to sheet metal or sheet metal. It is round in shape, with embossed teeth and guide groove at one end. The principle is to press the preformed hole of sheet metal through the embossing teeth. Generally, the hole diameter of the square preformed hole is slightly smaller than that of the embossing teeth of the rivet nut. The embossing teeth of the rivet nut are squeezed into the plate through the pressure, resulting in plastic deformation around the hole, and the deformed objects are squeezed into the guide groove, thus producing the locking effect.
The press riveting nuts can be divided into quick cutting steel press riveting nuts s, stainless steel press riveting nuts CLS, stainless steel press riveting nuts SP and copper and aluminum press riveting nuts CLA, which should be used in different environment. Specifications are usually from m2 to M12.
There is no unified national standard for press riveting nuts. The earliest press riveting nuts came from American manufacturers. After being introduced into China, they gradually formed the current industry standard and were accepted by chassis cabinet and sheet metal industry.
Technical guidelines for the application of rivet nuts:
1. S series riveting nuts are made of free cutting iron and treated by heat treatment. CLS series riveting nuts are made of free cutting stainless steel with no surface treatment.
2. The hardness of low carbon steel plate must be less than 70rb, and that of stainless steel plate must be less than 80RB.
3. It is applicable to plates of various thicknesses, with a minimum thickness of 0.8mm. The tail number Z corresponding to dimension a can only be determined according to the plate thickness and nut specification when using. The user selects samples and orders according to the tail number in the table according to the plate thickness;
4. According to the aperture size, it shall be accurately controlled, processed according to the tolerance size of 0 - + 0.075mm, preferably punched, and the nut shall be generally installed from the "disconnected" surface of the plate.
The installation process is generally realized by "press riveting" operation, and it must not be hammered in.