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.
f-16 aircraft end item identification, contact bearing seal type, 0.4998 inches minimum and 0.5000 inches maximum bore diameter, 18.00 degrees nominal contact angle, angular load direction