A cylindrical item in which the inner or outer ring turns upon row(s) of hardened roller, bearing which roll on a raceway, thus minimizing friction. These items are characterized by their noncorrosive qualities, lightness of weight, inch dimensions rather than metric, inner rings generally projecting beyond the faces of the outer ring, or a very narrow width inner ring having an outside diameter slightly larger than the bore diameter. Designed primarily for use in aircraft assemblies, such as control systems and surfaces of aircraft. Excludes:bearing,roller,cylindrical.
0.4995 inches minimum and 0.5000 inches maximum bore diameter, 0.8070 inches minimum and 0.8120 inches maximum outer ring width, 1.6870 inches minimum and 1.6875 inches maximum overall outside diameter, c18a acft end item identification, 0.9950 inches minimum and 1.0000 inches maximum inner ring width