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 
Australia 
New Zealand 
Greece Classification: Washers other than lock washers, iron or steel
NSN 5990-01-185-9835
NSN 6150-00-776-2738
NSN 6150-01-085-5858
NSN 6620-01-518-7803
NSN 6145-01-383-0634
NSN 5915-00-318-8872
NSN 6610-00-139-1105
NSN 5930-01-089-8615
NSN 6650-00-914-6897
NSN 5905-01-603-8256
NSN 5945-01-432-2416
NSN 6645-01-324-0348