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 6150-01-634-0575
NSN 5990-01-299-2014
NSN 7035-01-003-9142
NSN 6145-01-308-3858
NSN 5935-00-553-9185
NSN 5925-01-046-0375
NSN 5999-00-402-4517
NSN 5950-01-484-4556
NSN 6135-01-648-4875
NSN 5999-01-531-1649
NSN 6135-01-529-8523
NSN 6105-01-150-6751