Abstract: A circulating roller track or raceway is formed in a bearing block formed as a one-piece injection molding. The circulating roller track is interrupted by a bearing track or bearing raceway insert. The bearing track is raised above the plane of the circulating track and transitional ramp surfaces are provided. This bearing raceway insert has a mounting surface at the exterior of the bearing block at a calibrated distance or spacing from the bearing portion of the roller raceway. Thus only two precision components, a roller member and a bearing raceway insert, are required to obtain an accurate spacing between two mutually guided or bearing components.

Abstract: A roller body cage, such as a linear bearing cage rail structure having a series of roller bodies which are separated from each other by interposed spacer inserts, and which are prestressed in the longitudinal axial direction of the cage rail through the intermediary of one or more spring elements so as to provide a frictional force between the roller bodies and spacer inserts.