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, 200.0 pounds nominal bearing preload rating, angular load direction, aligning ring features provided, 5.4996 inches minimum and 5.5000 inches maximum bore diameter