Flat washer is a sheet material made of stainless steel. It has the characteristics of corrosion resistance, high strength, wear resistance and oxidation resistance. It is widely used in various mechanical equipment, especially in corrosive environments. It is usually used in electronic instruments, mold manufacturing, precision machinery, hardware parts, mechanical parts, stamping parts, small hardware manufacturing, and motor adjustment. This product can be used to solve machine maintenance problems when mold maintenance, mold gap measurement, and shaking, swinging and instability due to mechanical aging.