Lock washers are fasteners used to prevent bolts or nuts from loosening under mechanical vibration or dynamic loads. There are many types of lock washers, including internal tooth lock washers, external tooth lock washers, double stack self-locking washers, etc. Lock washers are made of a variety of materials, mainly including stainless steel, galvanized steel, spring steel and rubber. Haina has a lot of stock, including ASME B18.21.1, DIN25201, DIN6797A, GB862.2...