Special washer

A special washer, unlike lock or flat varieties, is equipped with additional design features.

It may have a non-standard configuration or hole diameter. There are many types of special washers, for example:

• square-shaped with variable thickness across the entire area (bevelled) and different angles of inclination — used for fastening angle profiles and channels;
• equipped with a different number of tabs;
• with an external ridge for additional fastening;
• with a surface covered in multiple teeth for stable contact with other parts;
• quick-release — removed without taking the bolt out of the hole;
• spherical or conical in shape and other types.

Special washers are used in many areas of manufacturing and the economy. They simplify the assembly process, especially in non-standard situations. Their purpose is to ensure a strong and reliable threaded connection of parts or structures under demanding operating conditions. Most often these fasteners are needed when joining assemblies with rotating shafts and moving parts.