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. Postal Service - Procurement and Supplies Dept. 
Greece 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 5985-01-318-2933
NSN 5925-00-999-1710
NSN 4140-01-654-1341
NSN 5835-01-068-3417
NSN 4140-00-528-2921
NSN 2925-01-236-3547
NSN 5945-01-415-0603
NSN 5990-01-027-1869
NSN 5935-01-230-4270
NSN 5855-01-656-6808
NSN 5945-01-044-7385
NSN 6645-01-324-1956