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 Navy 
Spain 
Republic of Korea 
Italy 
Greece 
Turkey Classification: Copper washers including spring washers not threaded
NSN 6610-01-647-7412
NSN 5895-01-262-6591
NSN 6320-01-454-1965
NSN 5930-01-587-4427
NSN 5895-00-278-5194
NSN 5905-00-823-4757
NSN 5925-01-451-0518
NSN 6110-01-610-8604
NSN 5855-01-443-2509
NSN 5990-00-734-3837
NSN 5920-01-170-7782
NSN 6610-01-192-6478