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.
annual ball bearing for quiet operation application to submarine usage reference number differentiating characteristics, motor ac 440 v 200hp 1200rpm end item identification, zzzw criticality code justification, annual ball bearing for quiet operation application to submarine usage departure from cited document