0.3750 inches nominal overall length, 0.4950 inches minimum and 0.5050 inches maximum body outside diameter, 0.1900 inches minimum and 0.1960 inches maximum body inside diameter, square all corners corner shape, paper overall and plastic phenolic overall or cotton overall and plastic phenolic overall material, mil-p-79,ty fbe,fbg,pbe,or pbg mil spec single material response overall material document and classification

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).