Name: Flex Lock Nut Material: Steel, Stainless Steel, Brass Finish: Cadmium, Zinc, Passivate We are one of the leading manufacturer and supplier in China, and the flex locknut is one of the largest selections of aerospace nut products. Its one piece, all metal construction stands up under extreme temperatures, vibration, and shock.. It consistently has good tensile strength and also is ideal for elevated temperature environments.