A rigid item usually circular in shape, designed to accommodate a bearing. It positions the bearing but does not encase it or restrain its motion.
4920-01-039-4139 stand,test,turbine end item identification, 4.7400 inches minimum and 4.7600 inches maximum overall width, steel comp 4340 overall material, 7.0000 inches nominal outside diameter, 3.3464 inches minimum and 3.3468 inches maximum bore diameter