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A plain washer (or 'flat washer') is a flat annulus or ring, often of metal, used to spread the load of a screwed fastening. Additionally, a plain washer may be used when the hole is a larger diameter than the fixing nut.
Split lock washers place tension against a nut after tightening, to help prevent loosening. 1  Stainless steel 18-8 The most common stainless steel for general hardware use. 2  Stainless steel 316 A highly corrosion resistant grade of stainless steel. 3  Zinc plated steel A low carbon steel for general use.