Angular contact ball bearings have a greater number of balls and higher capacities than deep groove ball bearings with the same boundary dimensions and are suitable for higher loads and speeds with proper lubrication. However, because of the absence of a flange on one side of the outer race, angular contact ball bearings are capable of supporting thrust loading in only one direction. This is why most applications employ two of the same bearings facing opposite directions, often as a duplex pair ball bearings. To obtain American angular contact ball bearings capable of duplex mounting, they must be ordered “flush ground”, designated by the “G” suffix. “G” basically means “No axial clearance, no preload.” In cases where the tandem mounting is required, another bearing with thrust capability is usually employed on the shaft to take thrust or locate the shaft in the opposite direction as the pair.
Preloading is often employed with duplex pairs of BAC bearings for various reasons, and their suffix designations are as follows:
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