RU series bearings utilize cylindrical rollers arranged in a crossed configuration, with adjacent rollers oriented at 90° angles to each other within precision-ground raceways. This arrangement provides line contact between the rollers and raceways, enabling the bearing to simultaneously support radial loads, axial loads in both directions, and tilting moments within a single, compact unit.

The distinguishing feature of the RU series is its solid construction on both rings. Unlike split ring designs, the RU series has one-piece inner and outer rings, which provides maximum rigidity and structural integrity. Both rings are equipped with mounting holes, allowing for direct bolted attachment to the machine structure without requiring additional housings, adaptor plates, or complex fixturing. The bearings are typically supplied with spacer retainers between rollers to ensure smooth, consistent rotation and prevent roller-to-roller contact.