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 
Spain 
Republic of Korea 
Turkey Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 5965-00-246-5612
NSN 5960-00-011-9315
NSN 2925-01-381-5307
NSN 5985-01-625-8630
NSN 4140-01-432-0855
NSN 5835-01-238-3381
NSN 6220-01-364-8666
NSN 5835-01-608-8868
NSN 6610-01-009-7760
NSN 6105-00-897-7380
NSN 6130-01-180-7069
NSN 5910-01-048-5654