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