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-25537 mil spec single material response lubrication material document and classification, aligning ring features provided, radial load direction, 1.9685 inches nominal bore diameter, 3.5430 inches nominal overall outside diameter