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 
Hungary 
Poland 
Slovakia 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Saudi Arabia 
Malaysia 
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 5960-01-252-8821
NSN 6610-00-762-0848
NSN 5905-00-636-9999
NSN 5975-01-028-6522
NSN 5990-00-050-7693
NSN 6320-00-242-3300
NSN 5895-01-151-9914
NSN 6685-00-217-9010
NSN 6320-01-532-7491
NSN 5915-00-542-2179
NSN 5945-01-500-1371
NSN 7035-01-057-6325