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-27617 mil spec single material response lubrication material document and classification, 3.5000 inches nominal bore diameter, air route surveillance radar 3,arsr3 end item identification, standard internal fit-up designation, angular load direction