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    Zhejiang zijinwang Technology Co., Ltd, established in 2019, is located in Sanmen County, Taizhou City, adjacent to Dawan District, Hangzhou Bay, with a registered capital of 20 million yuan. As a wholly-owned holding subsidiary of Sanmen Tongshun rivet Co., Ltd., the enterprise formerly known as Shenzhen zijinwang Technology Co., Ltd., relies on the parent company's more than 30 years of fastener R & D and production experience, and cooperates with the national iron and steel material testing center, the school of mechanical engineering of Zhejiang University, the Research Institute of railway and urban rail transit of Shanghai Tongji University, the school of material science and engineering of South China University of technology The school of mechanical engineering of Hangzhou University of Electronic Science and technology has established a long-term cooperative relationship between industry, University and research, conducted experimental analysis and Research on the self tightening principle, and is committed to the design, R & D and production of never loose fasteners, self tightening wrenches and self tightening series products.