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Washers are used to spread the load of a bolt or screw over a larger area or to help prevent loosening under vibration.
USS pattern is the most common type of flat washer.
Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. A tempered medium carbon steel. Zinc plated for moderate corrosion resistance.
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
Split lock washers place tension against a nut after tightening, to help prevent loosening.