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 Army 
Dept. of the Navy 
Greece Classification: Copper washers including spring washers not threaded
NSN 5905-01-089-8417
NSN 6135-00-948-7061
NSN 6135-01-294-2131
NSN 4140-01-530-0727
NSN 6645-01-389-1588
NSN 7035-01-615-1677
NSN 5920-01-605-3232
NSN 5975-00-900-6083
NSN 2925-01-434-6945
NSN 5895-01-023-3227
NSN 5855-01-551-7923
NSN 6650-01-463-2274