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.
U.s. Marine Corps 
Dept. of the Navy 
Spain 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 6685-01-470-6827
NSN 6685-00-916-5583
NSN 5920-01-182-1545
NSN 5910-01-025-2115
NSN 5945-01-015-4641
NSN 5925-01-423-0079
NSN 6320-00-405-2348
NSN 5998-01-484-9764
NSN 6105-01-462-1294
NSN 6650-01-517-9452
NSN 6220-01-632-3030
NSN 6650-01-329-3055