Underwater life support iaw navsea instruction 10560.2b
A tubular shaped item with a round or hexagon peripheral shape having two flat bearing surfaces perpendicular to the axis of the centrally located hole. It is designed to maintain a predetermined distance between assembled parts. The item may be with or without flange(s) of any peripheral shape. The overall length must exceed 25 percent of the outside diameter or distance across peripheral flats of the body. (when the length, outside diameter, and/or distance across peripheral flats are designed as a tolerance, the maximum dimension will be used to determine compliance). For items having other than a round or hexagon peripheral shape, see spacer, plate. Excludes items with lubricating features, see bearing, sleeve and bushing, sleeve. See also bushing, tapered; spacer, ring; washer, flat; and washer, (as modified).
Classification: Other articles of iron or steel not wire nesoi
NSN 5925-01-153-0144
NSN 6220-00-859-4909
NSN 6650-00-234-3275
NSN 6610-01-425-6960
NSN 6150-01-528-6748
NSN 5915-01-187-5755
NSN 6685-01-414-6800
NSN 2925-01-574-7119
NSN 5990-00-681-1675
NSN 6110-00-451-1462
NSN 6645-00-400-3115
NSN 5915-00-714-3829