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.
as modified by bearing preload rating departure from cited designator, radial load direction, 115 type and 50 grade nondefinitive spec/std data, unable to decode material, 3.0 pounds nominal bearing preload rating