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 
Spain 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 5975-00-451-7208
NSN 6240-01-201-9218
NSN 5945-00-454-5336
NSN 5925-01-415-9358
NSN 6135-01-505-1293
NSN 5835-01-398-3859
NSN 6620-01-643-6817
NSN 6105-01-287-9756
NSN 2925-01-454-2046
NSN 6650-01-344-6402
NSN 5915-01-408-6647
NSN 6105-01-338-7761