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 Air Force 
Brazil 
Germany Classification: Washers other than lock washers, iron or steel
NSN 6650-00-279-5741
NSN 6150-01-421-4028
NSN 6220-00-629-2461
NSN 5935-01-013-9384
NSN 5935-01-104-4930
NSN 6685-01-621-1974
NSN 5996-01-485-4751
NSN 5975-01-401-5355
NSN 6685-01-660-9276
NSN 5910-00-565-7671
NSN 5925-01-650-5714
NSN 6130-00-469-0640