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 6105-00-951-9844
NSN 6135-01-415-1163
NSN 5935-01-398-0688
NSN 6320-01-211-6578
NSN 5925-01-258-0488
NSN 6610-00-232-1533
NSN 5950-01-641-7722
NSN 5985-01-188-0359
NSN 5975-01-114-6082
NSN 5990-01-408-4188
NSN 5950-01-020-7717
NSN 5960-01-369-8666