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 
Poland 
Republic of Korea 
Netherlands 
Norway Classification: Washers other than lock washers, iron or steel
NSN 5855-01-364-1005
NSN 6685-00-398-0341
NSN 6130-01-576-7442
NSN 5985-01-003-7399
NSN 5950-01-031-5076
NSN 5935-01-530-4831
NSN 5895-01-337-4597
NSN 5855-01-440-1768
NSN 5935-01-295-9922
NSN 6650-01-514-0240
NSN 6130-01-525-7302
NSN 6240-01-249-2284