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.
Dept. of the Navy 
France 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 5910-01-485-3636
NSN 5950-00-288-0066
NSN 6320-01-267-7990
NSN 6110-00-163-6223
NSN 5910-01-385-8805
NSN 6320-01-574-1915
NSN 4140-01-089-7213
NSN 5990-01-411-1917
NSN 5998-01-647-0937
NSN 5990-01-044-4767
NSN 2925-01-376-9236
NSN 5965-00-884-2344