A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes disk, valve, graphite impregnated and lubricated items.
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National Aeronautics and Space Administration
National Aeronautics and Space Administration 
Austria 
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Brazil 
Spain 
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France 
Germany 
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Italy 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6105-01-052-0492
NSN 5925-01-196-5123
NSN 5998-00-329-4475
NSN 5990-00-263-1289
NSN 5930-00-359-7785
NSN 5945-01-047-0187
NSN 5855-01-020-7982
NSN 2925-01-387-0870
NSN 6105-01-500-8265
NSN 5999-00-611-0574
NSN 5930-00-051-6383
NSN 6610-01-230-9971