We can provides different types of bearing units that are ready-to-mount bearing units, which are greased and sealed, and are able to compensate for misalignment of the shaft with respect of the housing.
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Conventional SKF ball bearing units are referred to as Y-bearing units. These units consist of: 
a Y-bearing (insert bearing) which is based on a single row deep groove ball bearing with a sphered (convex) outside surface and an extended inner ring
a housing, which has a correspondingly sphered but concave bore. 
Y-bearing units can accommodate moderate initial misalignment, but normally do not permit axial displacement.