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.
mil-g-81322 mil spec single material response lubrication material document and classification, 3.1494 inches minimum and 3.1496 inches maximum overall outside diameter, nsn2350-01-305-0028 end item identification, 1.6535 inches nominal overall width, 1.3778 inches minimum and 1.3780 inches maximum bore diameter