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 6645-01-443-1103
NSN 5985-00-518-1748
NSN 5990-01-213-6319
NSN 6650-01-489-5394
NSN 6620-01-578-6562
NSN 6135-01-657-7116
NSN 6610-01-120-7670
NSN 6130-00-454-8342
NSN 6645-01-066-3176
NSN 6320-00-937-5625
NSN 5999-01-177-0473
NSN 6685-00-850-4149