DESCRIPTION - These Black Luster® Grade 8 Steel SAE Washers provide best in class decorative appearance and better corrosion resistance than black oxide and zinc plated finishes. Resistant to 1,000 hours of salt spray per ASTM B117*. Washers are primarily used to displace the load of a fastener head or a nut on a threaded joint. They can cover holes and act as spacers. These washers meet Society of Automotive Engineers specifications & generally have a smaller ID and OD than USS washers.