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 Air Force 
Greece Classification: Washers other than lock washers, iron or steel
NSN 5910-01-519-2308
NSN 5855-01-236-9645
NSN 5905-00-100-5250
NSN 5965-01-545-4544
NSN 5985-01-277-7172
NSN 6620-01-098-9866
NSN 6130-01-068-5031
NSN 5855-01-450-5609
NSN 6135-00-461-3590
NSN 5935-01-470-5125
NSN 6645-01-076-4655
NSN 6220-01-213-1127