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.
medium bearing preload designation, 0.2498 inches minimum and 0.2500 inches maximum bore diameter, 1.0 pounds nominal bearing preload rating, radial load direction, 0.0004 inches minimum radial and 0.0008 inches maximum radial internal clearance