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-18709 mil spec single material response lubrication material document and classification, 52.00 millimeters nominal overall outside diameter, standard internal fit-up designation, 25.00 millimeters nominal bore diameter, angular load direction