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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.

Washers, Grade 8

USS flat washer

USS flat washers

USS pattern is the most common type of flat washer.

SAE flat washer

SAE flat washers

SAE pattern is a tighter fit on the bolt and a smaller outside diameter.

Lock washer

Lock washers

Split lock washers place tension against a nut after tightening, to help prevent loosening.