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.
pressed retainer fabrication method, mil-g-23827 mil spec single material response lubrication material document and classification, unable to decode material, radial load direction, 15.0 pounds nominal bearing preload rating