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.
1.3778 inches minimum and 1.3780 inches maximum bore diameter, light bearing preload designation, angular load direction, tight internal fit-up designation, mil-g-18709 mil spec single material response lubrication material document and classification