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 
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Brazil 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5960-00-935-5030
NSN 5905-00-541-1471
NSN 6320-00-110-8005
NSN 5945-01-434-7249
NSN 6320-00-139-1090
NSN 5985-01-042-7955
NSN 5910-01-328-1685
NSN 6320-01-532-7491
NSN 6685-01-631-9414
NSN 5855-01-268-6468
NSN 6110-01-549-0410
NSN 6650-00-302-3707