Curved washers are a type of unthreaded fastener often used to fit around curved surfaces such as the outside diameter of a pipe or tube. Like other washers, they can provide a bearing surface for mating fasteners and are available in a range of materials. Curved washers are excellent for applications with repeated cycles through a range of motion along with a lighter thrust load. The curved washer is often superior to a helical spring for maintaining tension on a cam action or similar application where very little height is available.
The lock washer prevents nuts and bolts from turning, slipping and coming loose because of vibration and torque. Spring Lock Washers are of many types. The most common one being the helical split washer. A ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener’s head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
Star Washers or Serrated Washers with Internal Teeth. These are locking washers that form part of the serrated or toothed type of washers. They feature serrations or teeth that extend radially inward or outward to bite into the bearing surface.
External Star Lock Washers. Designed for use in providing increased locking force and torsional resistance, these washers are available in stainless steel, plain or zinc plated finishes.
A multi tooth washer increases frictional resistance and suitable for moving parts. The multi tooth lock washer works best with smaller screw heads. It is useful where a good grip is required but the teeth should not be visible as they affect the appearance of the product.
Multi-Tooth Washers External Multi-Tooth Washers Internal
Non flat washer. They Have a slight conical shape which give the washers a spring characteristic which provide an axial force when deformed.
These are among the most widely used tension generating washers. The washers enhance load or deflection values through stacking.
Conical washers, also known as contact Belleville washers, hold tight where heat or vibration might shake standard washers loose. Conical washers are known for their ability to provide the highest load bearing capacity and have a low deflection range. Basically, its a conical shell which can be loaded along its axis either statically or dynamically.