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 
Italy 
Turkey Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 6685-01-029-3773
NSN 5950-01-279-2818
NSN 5960-00-204-7506
NSN 6240-01-412-0715
NSN 5975-00-022-4457
NSN 5910-01-272-5057
NSN 5915-01-255-8696
NSN 6145-01-644-8675
NSN 5925-00-736-0425
NSN 5895-01-033-1419
NSN 6145-01-657-7588
NSN 6240-01-145-4916