Washers are used to spread the load of a bolt or screw over a larger area or to help prevent loosening under vibration.
General use flat washer
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
A tempered medium carbon steel. Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Washers with oversized outside diameters.
Split lock washers place tension against a nut after tightening, to help prevent loosening.