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 
Republic of Korea 
Italy 
Greece 
Turkey Classification: Copper washers including spring washers not threaded
NSN 5996-01-415-4629
NSN 6645-01-265-2746
NSN 6240-01-454-1603
NSN 5835-01-574-8879
NSN 5996-01-618-8986
NSN 5910-01-443-3625
NSN 5950-01-600-1432
NSN 5945-01-170-4432
NSN 5965-01-304-7179
NSN 7035-01-068-5077
NSN 6145-00-570-0516
NSN 5905-01-202-8489