THK XRU1008CC0P5 (RU1008CC0P5 / RU28CC0P5) Crossed Roller Bearing
The THK XRU1008CC0P5 (also designated as RU1008CC0P5 or RU28CC0P5 in alternative naming conventions, and equivalent to IKO CRBF108ATCC0P5) is a high-precision, face-mount crossed roller bearing belonging to THK's RU series (Integrated Inner/Outer Ring Type with Mounting Holes).
The THK XRU1008CC0P5 (also designated as RU1008CC0P5 or RU28CC0P5 in alternative naming conventions, and equivalent to IKO CRBF108ATCC0P5) is a high-precision, face-mount crossed roller bearing belonging to THK's RU series (Integrated Inner/Outer Ring Type with Mounting Holes). This advanced bearing design features cylindrical rollers arranged perpendicular to each other in 90° V-grooves, separated by a precision spacer retainer, enabling it to simultaneously accommodate radial, axial, and moment loads from all directions while maintaining exceptional rotational accuracy.
Model Coding Explanation
| Code | Meaning |
|---|---|
| XRU/RU | Integrated Inner/Outer Ring Type with Mounting Holes |
| 1008/28 | Dimension code (Inner diameter 10 mm, Outer diameter 52 mm, Width 8 mm) |
| CC0 | Radial clearance group (Starting torque: 0.1-0.5 N•m, Radial clearance: 0-25 μm) |
| P5 | Precision class (ABEC-5 equivalent, meeting strict THK accuracy standards for rotational precision) |
Key Specifications
| Parameter | Value |
|---|---|
| Model Number | XRU1008CC0P5 / RU1008CC0P5 / RU28CC0P5 |
| Inner Diameter (d) | 10 mm |
| Outer Diameter (D) | 52 mm |
| Width (B) | 8 mm |
| Roller Pitch Circle Diameter (dp) | 28.5 mm |
| Mounting Holes - Inner Ring | 4 holes, PCD 16 mm, M3 threaded holes |
| Mounting Holes - Outer Ring | 6 holes, PCD 42 mm, φ3.4 through holes with φ6.5 counterbores (depth 3.3 mm) |
| Basic Dynamic Load Rating (Cr) | 2.9 kN |
| Basic Static Load Rating (Cor) | 2.4 kN |
| Mass | 0.12 kg |
| Precision Class | P5 (Rotational accuracy: Radial runout - 4 μm, Axial runout - 4 μm) |
| Radial Clearance | CC0 group (0-25 μm) |
| Material | High carbon chromium bearing steel (SUJ2, JIS G 4805) |
| Sealing Options | Open type (as specified in this model); sealed versions (UU suffix) available |
| Operating Temperature Range | -20°C to +110°C |
| Starting Torque | 0.1-0.5 N•m (CC0 group) |
Structural Features
- Integrated Inner/Outer Ring Design: Both rings are one-piece construction, eliminating the need for special flanges or housings, providing exceptional rigidity and stability compared to split-ring designs.
- Dual-Direction Rotation: Suitable for both inner-ring rotation and outer-ring rotation applications, offering versatile integration into various mechanical systems.
- Face-Mount Configuration: Pre-machined mounting holes on both rings allow direct bolting to equipment, simplifying installation and reducing assembly time.
- Crossed Roller Arrangement: Ensures uniform load distribution across all rollers, maximizing load capacity while minimizing overall bearing size.
- Spacer Retainer Technology: Prevents roller contact and cage locking, improving reliability, reducing friction, and extending service life compared to traditional steel plate retainers.
Applications
The XRU1008CC0P5 is ideally suited for applications requiring compact dimensions, high rigidity, and precise rotation control:
- Industrial robot joints and rotary components
- Precision rotary tables for machine tools and metrology equipment
- Medical devices (e.g., diagnostic scanners, surgical robots, imaging systems)
- Semiconductor and IC manufacturing equipment
- Measuring instruments and optical devices
- Small precision automation systems and manipulators
Installation & Maintenance Guidelines
- Mounting: Secure directly to equipment using appropriate M3 bolts for the inner ring and matching bolts for the outer ring without special housing or presser flanges.
- Preload: Factory-set CC0 radial clearance provides optimal performance for most applications; preload can be applied for enhanced rigidity if required by specific operating conditions.
- Lubrication: Open type requires initial grease lubrication (THK recommended: lithium soap-based grease with appropriate viscosity); sealed versions (UU suffix) are factory-lubricated for life under normal operating conditions.
- Operating Limits: Avoid shock loads and excessive speeds beyond rated capacity to ensure maximum service life and maintain precision performance.
- Accuracy Assurance: Mounting surfaces should be flat and parallel to maintain the bearing's P5 class rotational accuracy (radial runout ≤ 4 μm, axial runout ≤ 4 μm).
