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 
Canada Classification: Washers other than lock washers, iron or steel
NSN 6150-01-119-2144
NSN 6650-01-633-9147
NSN 6110-01-269-0524
NSN 5999-01-524-0554
NSN 5998-00-038-8334
NSN 6110-01-024-9428
NSN 5950-01-548-6480
NSN 6645-01-594-1439
NSN 6150-01-418-2545
NSN 6620-01-160-0439
NSN 5998-00-589-3719
NSN 6130-01-336-6069