These bearings have balls enclosed in a cage between the shaft raceway washer that corresponds to the inner ring and the housing raceway washer that fits the outer ring. They can bear only single-direction axial loads.
These can support axial loads in both directions, with high rigidity in the axial direction due to a large contact angle. Their structure is not suited to grease-lubricated vertical shafts.
These are used in back-to-back duplex (DF) arrangements and can support only bi-directional axial loads. They are superior to double-direction thrust angular ball bearings with low axial rigidity in high-speed properties.
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