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 6610-01-316-8902
NSN 5960-00-458-9540
NSN 6620-01-015-2470
NSN 5855-01-446-1936
NSN 6220-00-783-6178
NSN 6130-00-932-0384
NSN 5920-01-547-6517
NSN 5935-01-570-8017
NSN 6650-01-311-9011
NSN 7035-01-188-5935
NSN 5930-01-400-6126
NSN 6685-01-526-0569