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 6685-01-481-3864
NSN 6240-01-043-3595
NSN 5910-01-490-1479
NSN 6320-01-089-9086
NSN 5990-00-226-1152
NSN 6105-01-088-8133
NSN 5965-01-093-0642
NSN 5975-01-474-5631
NSN 5999-01-548-3929
NSN 2925-01-532-8445
NSN 6320-01-111-0221
NSN 6110-01-469-6490