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 5925-00-350-4589
NSN 6220-00-775-0214
NSN 5960-01-201-5804
NSN 6650-01-178-8731
NSN 5990-01-485-0260
NSN 5915-00-181-9223
NSN 5990-00-961-6186
NSN 6645-00-991-8704
NSN 5895-01-456-1702
NSN 5985-01-004-6453
NSN 5910-01-420-3459
NSN 7035-00-442-1869