IKO CRBH258AUUC1 Cross Roller Bearing
CRBH258AUUC1 is a high‑rigidity crossed roller bearing from IKO’s CRBH series, featuring an integral one‑piece inner/outer ring design with cylindrical rollers alternately crossed at 90° in V‑grooves, guided by precision separators. This compact bearing supports radial, axial, and moment loads simultaneously with minimal elastic deformation.
CRBH258AUUC1 is a high‑rigidity crossed roller bearing from IKO’s CRBH series, featuring an integral one‑piece inner/outer ring design with cylindrical rollers alternately crossed at 90° in V‑grooves, guided by precision separators. This compact bearing supports radial, axial, and moment loads simultaneously with minimal elastic deformation. It is factory‑equipped with double rubber contact seals (UU) and small radial internal clearance (C1), ideal for high‑precision rotary applications requiring compactness and rigidity.
Official Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Model | CRBH258AUUC1 | — |
| Inner Diameter (d) | 25 | mm |
| Outer Diameter (D) | 41 | mm |
| Width (B) | 8 | mm |
| Minimum Chamfer (rₘᵢₙ) | 0.3 | mm |
| Shaft Mounting Diameter (dₐ) | 28.5 | mm |
| Housing Mounting Diameter (Dₐ) | 36.5 | mm |
| Basic Dynamic Load Rating (C) | 3,120 | N |
| Basic Static Load Rating (C₀) | 2,810 | N |
| Mass | 0.05 | kg |
| Internal Clearance | C1 | Small radial internal clearance |
| Seal Type | UU | Double rubber contact seals (both sides) |
| Retainer | Precision separator | Roller guidance |
| Material | High‑carbon chromium bearing steel (SUJ2) | — |
| Operating Temperature | -20°C to +110°C | Standard service range |
| Accuracy Class | JIS Class 0 (P0) | ISO 492 / ABEC 1 |
| Lubrication | Factory‑filled lithium‑base grease | Non‑relubricatable |
| Max. Rotational Speed (Grease) | 60,000 | r/min |
Key Design Features
- Integral Ring Structure: One‑piece inner/outer rings ensure stable rotational accuracy and rigidity for both inner‑ring and outer‑ring rotation.
- High Rigidity: Crossed roller arrangement provides exceptional rigidity in a compact profile, outperforming conventional bearing combinations.
- Multi‑Directional Load Capacity: Single bearing supports radial, axial, and moment loads, simplifying mechanical design.
- Minimal Elastic Deformation: Line‑contact rolling surfaces result in extremely low elastic displacement under load.
- Contamination Protection: UU double seals prevent dust and coolant ingress, extending service life in industrial environments.
- Small Clearance (C1): Factory‑set small radial clearance ensures high precision and stable performance.
- Pre‑Assembled: Ready‑to‑install with rollers and separators pre‑assembled for easy mounting.
Typical Applications
- Industrial robot joints and rotary actuators
- Precision rotary tables for machine tools
- Semiconductor manufacturing equipment (wafer handlers, inspection tools)
- Medical diagnostic and imaging equipment
- Optical positioning systems and measuring instruments
- Compact automation modules and high‑precision indexing tables
Model Code Explanation (IKO Standard)
| Code | Meaning |
|---|---|
| CRBH | High‑rigidity crossed roller bearing series (integral inner/outer rings) |
| 25 | Inner diameter = 25 mm |
| 8 | Width = 8 mm |
| A | Standard type (no mounting holes) |
| UU | Double rubber contact seals (both sides) |
| C1 | Small radial internal clearance |
