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 5965-01-333-8560
NSN 6130-01-592-6285
NSN 5965-00-372-2537
NSN 6320-01-103-6218
NSN 6685-01-282-8837
NSN 6620-01-152-9453
NSN 6320-01-316-6864
NSN 5920-01-186-6335
NSN 6105-01-378-2128
NSN 5930-01-407-0063
NSN 6145-00-899-5031
NSN 6650-01-353-5903