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.
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Singapore 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5996-01-029-2904
NSN 5975-01-204-4085
NSN 6105-01-419-1217
NSN 6110-01-553-3279
NSN 6240-01-103-3081
NSN 2925-01-553-0181
NSN 5930-00-928-5106
NSN 5985-00-845-4818
NSN 5996-01-186-5671
NSN 6685-01-148-7688
NSN 5835-01-566-5462
NSN 5935-01-209-1338