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 
Canada 
Italy 
Turkey Classification: Other articles of iron or steel not wire nesoi
NSN 5998-01-332-3907
NSN 4140-00-587-7496
NSN 5935-01-038-0388
NSN 4140-00-226-5872
NSN 5996-01-131-0006
NSN 5925-01-583-2052
NSN 6240-01-335-9772
NSN 5998-01-278-0785
NSN 6620-01-068-4498
NSN 5950-01-363-8512
NSN 6650-01-204-7841
NSN 6135-01-215-1245