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 6220-01-178-4652
NSN 5930-01-221-4278
NSN 4140-00-086-7559
NSN 5999-01-569-3002
NSN 5996-01-414-1685
NSN 5905-01-391-4983
NSN 5990-01-108-7785
NSN 5855-01-100-3272
NSN 6645-01-572-4475
NSN 5998-01-363-1866
NSN 5920-01-445-2450
NSN 6105-01-240-0084