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Category of rivet studs. It is formed by pressing rivet nut parts and bolt parts. The stud is connected to the sheet metal hole by pulling and riveting at one time to provide external thread support. At the same time, it can also meet the requirements of anti loosening, anti rotation, waterproof sealing, etc. According to the head type and rod type of rivet nut, it can be divided into flat head, countersunk head, hexagonal, external pattern and other series.