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.
Austria 
Republic of Korea 
Greece Classification: Washers other than lock washers, iron or steel
NSN 6320-01-355-3998
NSN 6650-01-624-6959
NSN 6105-01-462-1657
NSN 6135-01-441-0402
NSN 6145-00-476-5720
NSN 7035-01-235-6023
NSN 2925-01-243-0328
NSN 5965-00-100-1291
NSN 2925-01-244-3016
NSN 6130-01-008-6461
NSN 5920-00-372-5864
NSN 6650-01-520-8701