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.
2.1250 inches nominal center to center distance between mounting holes along side of a square, acft,osprey v-22a; usmc end item identification, 0.5000 inches nominal flange thickness, 2.7500 inches nominal housing width, 1.0000 inches nominal bore diameter