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 Army 
Greece Classification: Washers other than lock washers, iron or steel
NSN 2925-01-525-2892
NSN 6105-01-418-1877
NSN 5960-01-065-9684
NSN 5910-01-484-2639
NSN 5960-01-649-1341
NSN 5960-01-529-8797
NSN 5960-01-526-2323
NSN 5920-01-135-9261
NSN 5905-01-218-5520
NSN 5855-00-797-8217
NSN 6240-01-352-3642
NSN 6650-00-231-7434