Shaft Diameter 20mm RU42 Crossed Roller Bearing 20X70X12mm Precision Robot Bearing

The RU42 bearing is designed for high-precision rotational motion, featuring crossed cylindrical rollers arranged at right angles to provide exceptional rigidity and load-bearing capacity. Key features include:

• Outer Diameter: 70 mm
• Bore Diameter: 20 mm
• Width:12mm
• Structure: Integrated compact design supporting radial, axial, and moment loads in any direction.
• Installation: Simplified by eliminating the need for a mounting flange.

The RU42 bearing excels in applications requiring high performance and reliability, offering superior stiffness and load capacity while simplifying installation.

What's the Performance Features of RU42 Crossed Roller Bearing?

1. High Precision: Achieves P4 and P2 precision levels, ensuring exceptional rotational accuracy and stability.

2. High Rigidity: Features preloaded design to enhance structural stiffness and performance.

3. High Load Capacity: Capable of supporting bi-directional axial loads, radial loads, and tilting moments, making it suitable for complex loading conditions.

4. Compact Design: Its small size helps save valuable space in machine tools without compromising performance.

What's the Applications of the RU42 Crossed Roller Bearing?

The RU42 cross roller bearing is widely used in precision machinery due to its high rigidity, high accuracy, and compact design. Below are its main application areas and specific use cases:

1. Industrial Robotics

• Robot Joints & Rotating Parts:

Its compact structure and high load capacity make it ideal for robot joints and rotating parts, often replacing imported products (e.g., THK models) .

• Collaborative & Humanoid Robots:

Suitable for six-legged, four-legged, and humanoid robots, meeting high-precision motion control needs .

2. CNC Machines & Processing Equipment

• Rotary Tables & Workbenches:

Used in CNC rotary tables, machining center workbenches, and precision rotary platforms, providing stable radial and axial load support .

• Machine Spindles & Tools:

Supports high-precision components like hollow rotary platforms and direct-drive motors (DD motors) .

3. Medical & Precision Instruments

• Medical Devices:

Applied in surgical robots and medical imaging equipment (e.g., CT, MRI) for smooth, low-noise rotation .

• Precision Measuring & Optical Instruments:

Used in radar antennas and optical testing devices requiring high rotational accuracy .

4. Aerospace & Defense

• Aerospace Systems:

Found in aircraft rudders, spacecraft payload support systems, and mobile radar vehicles, meeting high rigidity and extreme environment demands .

• National Key Research Projects:

Replaces imported bearings in military applications like special robots and radar communication equipment .

5. Other High-Precision Applications

• Semiconductor & Automation Equipment:

Used in IC manufacturing and semiconductor processing equipment for precise transmission systems [716].

• Photography Equipment:

Ensures smooth motion control in high-end gimbals and stabilizers [6].

• Energy & Environmental Equipment:

Adopted in wind power generation and precision machine tools by companies like Guoji Jinggong [2].

6. Import Substitution & Localization

As alternatives to imported brands like THK, widely used in machinery repairs and upgrades .

RU Series (Integrated Inner/Outer Ring Type) Crossed Roller Bearing

The RU series bearings feature provided mounting holes, eliminating the need for a presser flange or housing. Additionally, with an integrated inner/outer ring structure and equipped with washers, their performance is minimally impacted by the mounting procedure. This ensures stable rotation accuracy and torque.

This model supports both inner-ring rotation and outer-ring rotation, offering high flexibility and adaptability.

If you need more detailed information , feel free to ask!