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 Air Force 
Dept. of the Navy 
Israel Classification: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5985-01-005-2746
NSN 5965-00-484-3966
NSN 5905-01-089-8723
NSN 6685-01-629-7779
NSN 5965-01-258-5662
NSN 6130-00-292-5058
NSN 6110-01-400-4207
NSN 6645-01-522-7447
NSN 5855-01-513-8367
NSN 6130-01-088-7779
NSN 5855-01-587-7608
NSN 5990-01-465-9235