A spring washer, also known as a lock washer or split washer, is a type of mechanical fastener used to prevent the loosening or self-unwinding of nuts and bolts. It consists of a flat, typically circular metal component with a gap cut out of it, allowing the washer to exert a spring-like tension when inserted into threads. Spring washers are available in various materials, including steel, stainless steel, brass, and plastic, to suit different applications and environmental conditions. They may also be coated or plated with materials like zinc or nickel to improve corrosion resistance and aesthetics. Haina has spring washer of various specifications and materials, Our best-selling products are DIN127, DIN7980, ANSI/ASME B18.21.1, GB93……