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 6320-01-462-3555
NSN 5945-01-196-6030
NSN 6145-01-542-9437
NSN 6650-01-457-8743
NSN 5855-01-273-6132
NSN 5998-01-360-2694
NSN 5895-01-044-5332
NSN 6620-01-296-9803
NSN 6650-00-170-5095
NSN 6220-01-176-9139
NSN 6130-01-319-2645
NSN 6135-01-125-4867