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