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Help CenterONA ORBH 12025A Ultra-Thin Crossed Roller Bearing P4/P2 High Rigidity Integrated Rings
Product Spotlights
Ultra‑thin, compact design – Minimized cross‑section saves valuable installation space
High rigidity – The one‑piece construction delivers exceptional stiffness, ideal for applications requiring both compactness and high rigidity
High precision grades P5, P4, P2 – Meets demanding accuracy requirements for robotics, machine tools, and medical equipment
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1. Product Overview
The CRBH series (also designated as ORBH series by ONA) is a thin‑section crossed cylindrical roller bearing featuring an integrated (one‑piece) inner and outer ring construction. This design provides higher structural rigidity compared to split‑ring types such as the RB series (split outer ring). The CRBH series is characterized by its extremely thin outer and inner ring structure, making it an ideal solution for applications where installation space is limited but high rigidity and precision are required.
The bearing does not have mounting holes on either ring. Therefore, installation requires a presser flange or housing to secure the bearing in place.
As part of Luoyang ONA Bearing Co., Ltd.’s precision product portfolio, the CRBH/ORBH series is manufactured to the highest quality standards and serves as a direct replacement for IKO CRBH series, THK CRBH series, and other major brands.
2. Structural Design
2.1. One‑Piece Inner and Outer Rings
The defining characteristic of the CRBH series is that both the inner ring and the outer ring are single, non‑split components. This one‑piece construction provides:
Higher overall rigidity – No split lines to compromise stiffness
Simplified handling – No risk of rings separating during transport or assembly
Minimal mounting influence – Performance is minimally affected by the mounting procedure, ensuring stable rotational accuracy and torque
Reduced installation errors – Integrated structure eliminates assembly‑related inaccuracies
2.2. Ultra‑Thin Section Design
The CRBH series features an extremely thin cross‑section with both inner and outer ring thicknesses minimized:
Significant space savings – Ideal for compact machine designs
Weight reduction – Lowers inertia in dynamic applications
No mounting holes – Requires presser flange or housing for installation
2.3. Crossed Roller Arrangement
Inside the CRBH bearing, cylindrical rollers are arranged perpendicularly to each other on 90° V‑shaped raceways. The rollers are separated by spacer retainers (isolation blocks) that maintain proper spacing and orientation.
This arrangement ensures:
Rollers do not tilt or skew during operation
Rollers do not rub against each other, eliminating friction between rolling elements
Friction torque is low and uniform across the entire speed range
Smooth rotation and suitability for higher rotational speeds
2.4. Available Variations
| Variation | Description |
|---|---|
| CRBH (Open type) | Standard open bearing without seals |
| CRBH‑AUU (Sealed type) | Double end face seal type – prevents contamination and retains grease |
3. Key Performance Characteristics
3.1. High Rigidity
The one‑piece inner and outer ring construction delivers exceptional rigidity – significantly higher than split‑ring designs. This high rigidity ensures:
Minimal elastic deformation under heavy or varying loads
Excellent machining stability in precision applications
Superior moment load resistance – critical for robotic joints and rotary tables
High rigidity without being affected by surrounding structures
3.2. High Precision (P5, P4, P2)
ONA CRBH series bearings are manufactured to the highest precision standards:
| Precision Grade | Equivalent Standard | Typical Application |
|---|---|---|
| P5 | ISO Class 5 | General precision robotics and automation |
| P4 | ISO Class 4 | High‑precision machine tool rotary tables |
| P2 | ISO Class 2 | Ultra‑high‑precision measuring equipment and aerospace |
Each bearing undergoes rigorous inspection for dimensional accuracy, running accuracy (radial and axial runout), and torque consistency.
3.3. High Load Capacity
Because the rollers are arranged perpendicularly on V‑shaped raceways, a single CRBH bearing can simultaneously withstand:
Radial loads – Forces perpendicular to the shaft axis
Bidirectional axial loads – Thrust forces from both directions
Overturning moment (tilting moment) loads – Critical for applications where the load is offset from the bearing center
3.4. Stable Rotational Accuracy and Torque
The integrated ring structure ensures that performance is minimally affected by the mounting procedure:
Factory‑set precision remains unchanged after installation
Stable rotational accuracy is maintained regardless of mounting conditions
Consistent torque performance throughout the bearing’s service life
Suitable for both inner ring rotation and outer ring rotation applications
3.5. Smooth Rotation with Low Friction
Spacer retainers between rollers prevent roller‑to‑roller contact:
Low starting torque – Easy to initiate rotation
Uniform running torque – Consistent torque across the entire speed range
Smooth operation – No torque spikes or locking phenomena
Suitability for higher speeds – Enables high‑speed rotation
3.6. Premium Material – Carburized Steel
CRBH series bearings are manufactured from high‑quality carburized bearing steel (GCr15), providing:
Excellent impact resistance – withstands shock loads
Superior surface wear resistance – extends service life
High rolling contact fatigue strength – supports long‑term, high‑duty operation
Hardened raceways (60–62 HRC) – optimal wear resistance
4. Application Fields
The CRBH series is widely used across various high‑precision industries where space is limited but rigidity and accuracy are critical:
| Application Area | Specific Equipment / Use | Why CRBH Series Is Suitable |
|---|---|---|
| Industrial Robots | Joints (shoulder, elbow, wrist), swiveling units, rotating actuators | High rigidity under dynamic loads; compact size fits limited joint space; supports moment loads from robot arms |
| Machine Tools | Rotary tables (4th/5th axes), indexing heads, turret mechanisms | P4/P2 precision ensures accurate positioning; handles combined cutting forces |
| Medical Equipment | Surgical robots, CT scanner components, exoskeleton robots, diagnostic devices | High reliability; smooth rotation; compact design |
| Measuring Instruments | CMMs, optical inspection systems, precision test fixtures | Exceptional rotational accuracy (P4/P2); extremely low starting torque |
| Semiconductor / IC Manufacturing | Wafer handling robots, inspection stages, dicing equipment | Clean operation; smooth motion; minimal particle generation |
| Radar & Aerospace | Radar rotating mechanisms, antenna positioning systems, optical mounts | High reliability; high rigidity; wide temperature range capability |
| General Automation | Rotary indexers, assembly turntables, cam indexers | Long maintenance‑free life; easy installation |
| Solar Power Equipment | Solar tracking systems, positioning mechanisms | High rigidity and precision under varying loads |
5. Available Models
The CRBH series is available in a range of standard sizes. Below are representative models:
Model Code Breakdown:
CRBH – Series designation (crossed roller bearing, integrated rings, thin section)
First digits – Inner diameter in mm
Last digits – Outer diameter in mm (or width)
A – Standard type
AUU – Double end face seal type
Note: ONA also offers the ORBH series as an equivalent to the CRBH series. For detailed dimensional data, load ratings, and custom sizes (including non‑standard bore diameters and widths), please contact ONA’s engineering team.
6. Installation Requirements
The CRBH series does not have mounting holes on either ring. Therefore:
Presser flange or housing is required for installation
The bearing must be clamped between flanges or housed in a support structure
Proper alignment of mounting surfaces is essential to maintain precision
Even clamping force should be applied to prevent ring distortion
Despite the need for external clamping, the integrated ring structure ensures that performance is minimally affected by the mounting procedure.
7. Summary of Core Advantages
| Advantage | Description |
|---|---|
| One‑piece rings | Highest rigidity; no split‑line weakness |
| Ultra‑thin section | Saves valuable installation space |
| High rigidity | Exceptional stiffness – ideal for compact high‑rigidity applications |
| High precision | P5, P4 and P2 grades available |
| Stable rotation | Integrated structure minimizes mounting influence |
| Smooth operation | Spacer retainers ensure low, uniform friction torque |
| High speed capability | Suitable for higher rotational speeds |
| Versatile rotation | Suitable for both inner ring and outer ring rotation |
| High load capacity | Supports radial, axial and overturning loads simultaneously |
| Premium material | Carburized steel for impact and wear resistance |
| Wide size range | Multiple standard models plus custom sizes available |
| Direct interchangeability | Replaces IKO CRBH, THK CRBH, and other major brands |
8. Conclusion
The ONA CRBH/ORBH Series is the ideal choice for design engineers who need a compact, high‑rigidity crossed roller bearing with integrated rings and ultra‑thin cross‑section. By eliminating split lines through the one‑piece ring construction, the CRBH series delivers superior rigidity, precision, and stable performance – all in a space‑saving package.
Whether you are designing an industrial robot joint, a precision rotary table, a medical device, or a semiconductor handling system, the CRBH series provides the optimal combination of thinness, rigidity, and precision.
ONA CRBH Series – Integrated strength, ultra‑thin profile, uncompromised precision.
ONA – Precision by Design
For complete dimensional tables, load ratings, and custom engineering support, please contact ONA’s sales team.
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