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 
Greece Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 6130-01-198-0539
NSN 6110-01-633-9660
NSN 5935-01-033-5993
NSN 5996-01-422-5495
NSN 6650-00-804-2039
NSN 6110-01-514-1778
NSN 6685-01-559-3626
NSN 5895-01-359-1140
NSN 6685-01-461-6992
NSN 6130-01-345-2177
NSN 6620-01-210-4401
NSN 6320-01-237-9746