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 7035-01-487-6481
NSN 5999-01-148-1103
NSN 2925-00-081-6835
NSN 5998-01-361-9838
NSN 6610-01-140-3348
NSN 6320-01-033-6624
NSN 5855-01-191-3404
NSN 6685-00-729-6498
NSN 5985-01-146-4877
NSN 5910-01-067-1550
NSN 6650-01-049-1881
NSN 6220-01-453-9038