In railway, wind power, chemical industry, heavy machinery and other industries, fastener loosening has always been an urgent problem to be solved. The replacement cost of imported anti loosening fasteners is high, the self-developed products can not achieve the expected anti loosening effect, and fastener loosening safety accidents occur frequently. These problems always affect the progress and development of the industry.

      The new generation of plane self tightening nuts developed by Zhejiang zijinwang Machinery Co., Ltd. through the application of mechanical principle and self tightening principle are widely used in railway, wind power, chemical industry, heavy machinery and other industries. After test and effect verification, they can completely solve the potential safety hazards caused by loose fasteners in the industry and improve the service life of products, It avoids a large number of labor costs caused by secondary preloading and process maintenance.