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.
Dept. of the Navy 
Brazil 
Spain 
Canada 
Turkey Classification: Articles of aluminum nesoi
NSN 5915-01-624-7632
NSN 5998-01-514-2492
NSN 6145-01-530-6672
NSN 6685-01-208-1033
NSN 5945-00-443-4687
NSN 7035-01-116-6223
NSN 4140-01-247-8701
NSN 6150-00-840-5847
NSN 5998-01-382-9321
NSN 5910-01-179-1879
NSN 5935-01-443-5674
NSN 2925-01-197-7864