Product: spherical washers & conical seat Material: carbon steel, stainless steel Standard: DIN, EN, ISO, ANSI, JIS Size: all sizes Surface processing or other specifications can be designed according to your requirements. Others: We have developed several series of fasteners according to DIN, GB, ISO, ANSI (IFI), JIS standards, such as lock nuts, screws and keys. The rich experience accumulated during the last 20 years has put us firmly at the forefront of fastener innovation and development. We can not only produce high quality standard parts but also special ones according to customers' drawings or samples