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.
0.0008 inches minimum radial and 0.0010 inches maximum radial internal clearance, c calibration designator, extra loose internal fit-up designation, 2.0 pounds nominal bearing preload rating, 0.1873 inches minimum and 0.1875 inches maximum bore diameter