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 
Poland 
Czech Republic 
Brazil 
Spain 
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France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6110-01-340-2479
NSN 5925-00-108-4948
NSN 6685-00-584-7375
NSN 6610-00-164-1510
NSN 6150-01-521-8131
NSN 5895-01-039-1515
NSN 6110-01-354-7515
NSN 5996-01-146-5765
NSN 7035-01-187-6002
NSN 6135-01-538-7272
NSN 5855-00-821-7512
NSN 5985-00-369-0649