The most common style of wahers is a aluminum flat washer. More specialized washers provide additional benefits. Aluminum round flat washers are used to provide a bearing surface to minimize surface wear. They also distribute a fastener`s load to minimize surface deformation from fastener tightening or can cover large clearance holes. Customized sizes and anosided colors are available according to your requirement. Both 6061-T6 aluminum flat washers and 7075-T6 aluminum flat washers are ok for us.