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 
Austria 
Finland 
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Slovakia 
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Czech Republic 
Brazil 
Spain 
Columbia 
Singapore 
Kuwait 
Saudi Arabia 
Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
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NATO Maintenance and Supply Agency Classification: Cotters, cotter-pins, washers and similar articles, of aluminum
NSN 6240-01-357-7182
NSN 6650-00-294-0881
NSN 5855-00-058-1293
NSN 5930-01-446-5891
NSN 5910-01-476-7256
NSN 5935-01-632-2715
NSN 6645-00-199-3569
NSN 6105-01-356-2245
NSN 6135-01-426-8282
NSN 5920-01-160-6050
NSN 5998-00-706-8544
NSN 5910-01-464-0508