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, radial load direction, contact bearing seal type, 25.2480 inches minimum and 25.2500 inches maximum bore diameter, 0.0034 inches minimum radial internal clearance