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 5920-00-823-6088
NSN 6610-01-069-1156
NSN 5930-01-015-7412
NSN 6240-01-312-0847
NSN 5965-01-523-5998
NSN 6240-01-542-9964
NSN 5985-01-231-4705
NSN 5895-01-414-8362
NSN 5998-01-452-2094
NSN 5950-01-119-0389
NSN 5975-00-011-3714
NSN 6620-01-527-9798