Companies strictly follow the established control process, and in accordance with the product manufacturing process to form detailed quality documents, for measuring tools and standard parts can be regularly inspected. The production department is mainly responsible for the strict production of all products in accordance with the production process and bearing quality standards; the quality inspection department is mainly responsible for the strict inspection of all products in accordance with the standards. The raw materials of the company's products are made of steel from Daye and Shougang in Hubei Province. In the production process, the process flow card is used to track, the product is numbered, each part and each set of finished products are numbered, starting from the source of the product, from forgings into the factory, to finished products out of the factory, each process is tracked and tested, each bearing has a separate quality file, the product has traceability. All parts are inspected in every process, and detailed inspection records are made, including all inspection records between parts, parts inspection records, all inspection before entering assembly workshop, all inspection before packaging and other inspection processes. Perfect quality assurance system and advanced testing methods can effectively guarantee the stability and reliability of product quality, and also improve the market competitiveness of products.