The spring washer, also known as a spring ring, is a type of anti-loosening gasket with the ability to undergo elastic deformation. It is usually used in combination with bolts, nuts, and flat washers. Its main function is to counteract the loosening of the thread caused by factors such as vibration and temperature changes through its own elasticity. It is widely used in connection scenarios in machinery, automobiles, agricultural machinery, home appliances, etc. where there is vibration or dynamic load.