A flat metal or plastic item of various peripheral shapes having a solid (not laminated) cross-section. It is designed to maintain a predetermined distance between two surfaces. For round items without a hole having a solid rectangular cross-section use disk, solid, plain. For round or hexagonal items with only one hole centrally located and with the length (thickness) exceeding 25 percent of the outside diameter or distance across peripheral flats, see spacer, sleeve. The thickness between the two parallel bearing surfaces must be 0.006 inch, (0.152 mm) or more for items less than 1/4 inch (6.35 mm) across the peripheral diameter, or smallest overall outside dimension, or must be 0.016 inch (0.406 mm) or more for items 1/4 inch (6.35 mm) or greater across the peripheral diameter or smallest overall outside dimension. For items with a thickness less than those indicated above, see shim. For items with one hole centrally located conforming to the above dimensional criteria use washer, flat or spacer, ring as applicable. When thickness and/or outside diameter or smallest overall outside dimension is designated as a tolerance/dimension the maximum dimension will be used to determine compliance. Excludes gasket; insulator (as modified) and mounting pad, electrical-electronic component.
Thailand 
Republic of Korea 
Turkey Classification: Articles of aluminum nesoi
NSN 6620-01-500-9847
NSN 5925-01-146-9641
NSN 5935-01-423-8228
NSN 6150-01-567-9218
NSN 6135-01-528-6896
NSN 6240-01-017-8281
NSN 6240-01-245-8996
NSN 5895-01-204-6444
NSN 5930-00-246-4696
NSN 6105-01-532-1920
NSN 7035-00-286-6221
NSN 6150-01-132-5803