a process for manufacturing a bearing , which may be used in a tool within a bore hole . the process includes providing a tubular sleeve , applying a hard facing material on an outer surface of the tubular sleeve so that the hard facing material is fixed to the outer surface , and thereafter applying a material layer over the hard facing material so that the material layer is fixed to the hard facing material . the process further includes machining the material layer so that a portion of the material layer is removed , and then machining the inner surface so that only the hard facing material is left as an inner surface . the process further includes machining the inner and outer surfaces to form the bearing . the process further includes placing the bearing into a housing and inserting a mandrel into the bearing , where a hard coating of the mandrel abuts the bearing .