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.
2.9526 inches minimum and 2.9528 inches maximum bore diameter, zzzw criticality code justification, angular load direction, tight internal fit-up designation, annual ball bearing for quiet operation application to submarine usage departure from cited document