The RU Series Cross Roller Bearing belongs to the category of cross roller bearings. These bearings are perfect for applications that require high precision assembly, smooth rotation, and stable torque, such as precision index tables, optical devices, machine tools, and robotics.
The RU model features an integrated inner and outer ring structure, with mounting holes on both rings, eliminating the need for separate housings or flanges. Thanks to its compact bearing design, the RU Series Cross Roller Bearing offers multi-directional load handling capabilities and superior rotational accuracy for industrial automation bearings.
Precision Engineering: The Core Advantage
The precision bearings in the RU series provide exceptional rotational accuracy due to their integrated bearing system. Bearings can be directly installed onto equipment without affecting internal alignment, since both outer and inner rings come with pre-drilled mounting holes.
This design reduces assembly errors and prevents performance changes caused by mounting stress, making it an ideal choice for robotic arm bearings and high-load industrial applications.
Load Capacity and Application Versatility
The crossed roller design of the RU Series Cross Roller Bearing allows it to support axial, radial, and moment loads simultaneously. Cylindrical rollers are arranged at 90° angles, providing maximum load dispersion and contact area.
Examples of load capacity:
-
RU66 (35 mm ID, 95 mm OD): up to 22.3 kN static load and 17.5 kN radial load
-
RU445 and larger models: up to 473 kN static load and 222 kN dynamic load
Thanks to this efficient load-bearing capability, a single RU Series Cross Roller Bearing can replace multiple bearings, reducing system size, complexity, and weight. It is especially useful for rotary tables and precision machinery in industrial automation.
Lifespan and Durability
The RU Series Cross Roller Bearing is made from SUJ2 hardened bearing-grade steel or stainless-steel alternatives for corrosion resistance.
-
Heat-treated and precision-ground raceways and rollers ensure wear resistance and low friction
-
Bearings provide smooth operation over extended cycles when lubricated and protected with seals
These features increase bearing lifespan and make the RU series ideal for precision index tables, robotic arms, and automated equipment.
Materials and Manufacturing Excellence
The materials in RU Series Cross Roller Bearings are chosen for rigidity, dimensional stability, and durability.
-
Standard steel bearings: suitable for typical industrial environments
-
Stainless steel bearings: ideal for corrosive environments, cleanrooms, or vacuum systems
The compact, integrated design ensures reliable performance in both high-load and high-precision applications.
Selection Principles: How to Choose the Right RU Bearing
When selecting a RU Series Cross Roller Bearing, consider the following:
-
Rotational Accuracy: For applications requiring high precision bearings, choose the RU series
-
Load Type & Direction: Ideal for multi-directional forces in robotic arm bearings or rotary tables
-
Mounting Constraints: Built-in mounting holes simplify installation, reducing time and cost
-
Space Efficiency: Compact bearing design is ideal where space is limited
-
Application Environment: Choose material suited for corrosive, clean, or high-temperature conditions
Conclusion
The RU Series Cross Roller Bearing provides high precision, superior load capacity, and long-lasting durability in a compact design. It is a top choice for engineers in modern automation, robotics, and precision machinery.
These bearings are perfect for applications where stable torque, multi-directional load handling, and smooth rotation are critical. The integrated design and high-quality materials ensure consistent performance and long service life, making them ideal for industrial automation and robotic arm applications.
