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 
Finland 
Spain Classification: Other articles of iron or steel not wire nesoi
NSN 6145-01-212-3528
NSN 5855-01-330-0088
NSN 5998-00-168-2739
NSN 5975-01-464-2867
NSN 5925-00-279-6125
NSN 5905-01-320-8611
NSN 5915-01-121-3453
NSN 6110-01-039-1151
NSN 5960-01-265-8069
NSN 5998-01-257-1339
NSN 5855-01-602-9653
NSN 6645-01-018-1799