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 5920-01-363-5638
NSN 5915-00-161-9336
NSN 6650-01-348-8792
NSN 5930-01-442-0760
NSN 5998-01-267-9723
NSN 4140-01-383-4738
NSN 6620-01-192-0543
NSN 5996-01-198-4583
NSN 6685-01-476-8560
NSN 5985-00-644-9752
NSN 6685-01-004-6182
NSN 5960-01-632-6576