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 Navy 
Spain 
Greece 
Turkey Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 6645-01-486-1139
NSN 5965-01-618-1435
NSN 5930-01-408-6310
NSN 6240-01-442-3501
NSN 5905-01-541-5010
NSN 6220-00-854-2532
NSN 5950-01-030-7038
NSN 5985-01-441-3590
NSN 5990-00-870-0656
NSN 6685-00-079-1415
NSN 6685-00-379-4652
NSN 6220-00-941-4007