Yu Yao No.2 standard fastener factory was established in 1973,as the most professional manufacture of fasteners for High Pressure and High-Temperature Service, we have obtained trust from the customers in every region of China. We have a long history of being a manufacture for over 30 years, so the power of technology is abundant, and the quality of product is steady, the craft is advancing, all kinds of device of detecting are applied. We have passed ISO 9001 authentication in 2001. Our product ranged from the accessories of cars and compressor and valves.