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 5965-01-464-7983
NSN 6240-01-130-7854
NSN 6110-00-062-5908
NSN 6130-01-423-0612
NSN 5998-01-212-2423
NSN 5925-01-372-5353
NSN 5985-01-304-6659
NSN 4140-01-246-5358
NSN 5920-00-905-4769
NSN 5925-01-540-1616
NSN 6685-01-647-5983
NSN 5935-01-354-6755