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.
f-22 raptor aircraft end item identification, round, unthreaded mounting hole type, pillow block, optional split style designator, pillow block, ground support part name assigned by controlling agency, 0.218 inches minimum and 0.229 inches maximum mounting hole diameter