As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.

Black-oxide steel washers are mildly corrosion resistant in dry environments.

316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

Zinc- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.

Hot-dipped galvanized steel washers are 10 times as corrosion resistant as zinc- and zinc yellow-chromate plated washers.

Zinc-aluminum-coated steel washers are 40 times as corrosion resistant as zinc-plated washers and comparable to Magni-coated washers.

Aluminum washers are lightweight and corrosion resistant in wet environments.

Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Washers that meet ASME B18.21.1 adhere to strict dimensional standards. Steel washers also meet standards for material properties.

For technical drawings and 3-D models, click on a part number.