0.700 inches nominal overall length, 0.562 inches nominal first left counterbore depth, 0.020 inches nominal second left counterbore depth, 0.100 inches nominal first right step width, aluminum alloy 2011 material, qq-a-225/3,alloy 2011,t3 fed spec single material response 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 length must exceed 25 percent of the outside diameter or distance across peripheral flats. (when the length, outside diameter, and/or distance across peripheral flats are designated as a tolerance, the maximum dimension will be used to determine compliance.) it must have one or more internal steps (counterbores) and/or external steps on either or both bearing surfaces. Excludes:spacer, optical element. See also washer, recessed and washer, shouldered and recessed.