A spring washer, also known as a disc spring or Belleville washer, is a type of washer that is used to provide a spring-like action between two surfaces. It is typically made of a flat, circular piece of metal that has a slight conical shape, with the edges turned slightly upward to form a cup-like shape. The spring washer works by creating tension between the two surfaces it is placed between. When a load is applied, the spring washer compresses slightly, and the force exerted by the compressed spring washer helps to maintain the tension between the two surfaces.
Spring washers are commonly used in applications where vibration or shock may cause the fastener to loosen over time. The spring washer helps to prevent this by providing a constant tension on the fastener, which keeps it securely in place. Spring washers are available in a variety of sizes and materials, including steel, stainless steel, and brass. The choice of material will depend on the specific application and the environment in which the washer will be used. It is important to note that spring washers should not be used as a substitute for proper tightening of fasteners. They are designed to provide additional security and should be used in conjunction with proper tightening techniques to ensure that fasteners remain securely in place.