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-23827 mil spec single material response lubrication material document and classification, angular load direction, 0.7498 inches minimum and 0.7500 inches maximum bore diameter, 3.0 pounds nominal bearing preload rating, aligning ring features provided