Two single row annular ball bearings selected dimensionally to be a matched pair or set. The ring faces have been specially ground to specified offsets that will produce predetermined preload when mounted. May include a single row angular contact bearing with faces specially ground for duplex mounting.
0.5000 inches nominal bore diameter, unable to decode material, 1.1250 inches nominal overall outside diameter, iflols;catapult/arresting gear end item identification, 1 shield quantity