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.
b-1b acft end item identification, 1.2650 inches minimum and 1.2750 inches maximum overall width, 3.1493 inches minimum and 3.1496 inches maximum overall outside diameter, 2.1652 inches minimum and 2.1654 inches maximum bore diameter, angular load direction