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.
Brazil 
Republic of Korea 
Turkey Classification: Cotters, cotter-pins, washers and similar articles, of aluminum
NSN 6685-01-413-6487
NSN 5990-00-153-0055
NSN 5965-01-296-8991
NSN 5985-01-398-0786
NSN 5910-01-131-1689
NSN 6145-00-027-9852
NSN 6220-01-494-0572
NSN 5920-00-839-5438
NSN 6645-01-544-8874
NSN 5935-01-020-7578
NSN 5960-01-649-1341
NSN 5915-00-863-6751