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 
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Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
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United Kingdom 
Netherlands 
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NATO Maintenance and Supply Agency Classification: Cotters, cotter-pins, washers and similar articles, of aluminum
NSN 5895-01-410-6960
NSN 6240-01-184-4359
NSN 5950-01-075-1307
NSN 6105-01-241-9936
NSN 5990-01-023-3307
NSN 5930-00-546-9605
NSN 2925-01-645-2948
NSN 6135-00-461-3590
NSN 5910-00-104-7260
NSN 5895-01-031-4807
NSN 6685-01-605-8425
NSN 5996-01-290-4844