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 
Finland 
Hungary 
Lithuania 
Poland 
Bulgaria 
Czech Republic 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
Saudi Arabia 
Malaysia 
Thailand 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
Denmark 
Norway 
Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5996-01-398-0037
NSN 5930-00-208-1947
NSN 5965-01-477-6665
NSN 5945-00-308-0334
NSN 6645-01-345-4294
NSN 5975-01-210-3187
NSN 5975-01-409-0564
NSN 5965-01-480-3096
NSN 5920-01-295-6619
NSN 6685-01-390-0412
NSN 6650-01-143-4586
NSN 6610-00-824-3376