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 5930-01-158-5694
NSN 6685-01-380-4155
NSN 7035-01-364-8454
NSN 6650-00-187-5388
NSN 4140-01-181-2423
NSN 6130-01-010-3254
NSN 6150-01-354-1411
NSN 5895-01-433-2447
NSN 2925-01-157-9204
NSN 5996-01-170-0262
NSN 5930-01-451-2250
NSN 5998-01-649-1215