A single or multiple piece item without ball, plain or roller bearing(s). It is designed to meet various or specific conditions of mounting. For items with bearings, see bearing unit, ball; bearing unit, plain; and bearing unit, roller.
an/brr6 unit end item identification, 1.250 inches nominal flange thickness, hub,upper,drum part name assigned by controlling agency, 7.530 inches nominal housing length, 14.750 inches nominal bolt circle diameter