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 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 5999-01-145-4096
NSN 6145-00-081-2520
NSN 6105-00-874-9364
NSN 5950-01-262-9747
NSN 5910-01-482-6171
NSN 2925-01-554-5246
NSN 5950-00-989-0079
NSN 5950-01-656-6171
NSN 5910-01-056-3285
NSN 5975-00-862-4506
NSN 6650-01-502-9909
NSN 5895-01-264-3169