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-2985,fscm 30003 mfr ref single material response lubrication material document and classification, pressed retainer fabrication method, radial load direction, unable to decode material, 0.2498 inches minimum and 0.2500 inches maximum bore diameter