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 5990-01-317-9297
NSN 5965-01-502-9684
NSN 5915-01-500-4012
NSN 6220-01-384-5176
NSN 6320-00-468-8421
NSN 6220-00-902-7328
NSN 6220-01-442-7182
NSN 5895-01-516-9917
NSN 5930-01-608-8182
NSN 5945-01-572-6965
NSN 5855-01-138-4985
NSN 5990-01-013-8464