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Help CenterONA RE 60040 Thin-Walled Crossed Roller Bearing P4/P2 High Rigidity for Outer Ring Rotation
Product Spotlights
Inner ring split design – Easy installation and adjustable clearance/preload, same convenience as RB series.
High rigidity & high load capacity – 90° crossed roller arrangement supports radial, axial and overturning loads simultaneously.
P5/P4/P2 precision grades – Meets demanding accuracy requirements for machine tools and robotics.
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ONA RE Series – Crossed Roller Bearings (Inner Ring Division / Outer Ring Rotation)
1. Product Overview
The ONA RE Series is a fundamental type of crossed roller bearing specifically engineered for applications where high rotational accuracy of the outer ring is required. As an important complement to the RB series, the RE series shares the same external dimensions while featuring an opposite structural configuration – the inner ring is split into two parts, and the outer ring remains one integral piece [13†L12-L13][9†L11-L16]. This design ensures that the outer ring can rotate with exceptional precision while maintaining the inherent advantages of crossed roller bearings, including high rigidity, high load capacity, and compact dimensions [0†L6-L10].
As a product of Luoyang ONA Bearing Co., Ltd. – a precision bearing manufacturer founded in 2014 and based in Luoyang, China's bearing industrial base – the RE series is manufactured to the highest quality standards and is widely used as a reliable alternative to imported bearings from brands such as THK, IKO, and others.
2. Structural Design
The fundamental design of the RE series is derived from the RB series, with main dimensions identical to RB series bearings [5†L6-L6][15†L4-L4]. However, the structural configuration is specifically optimized for outer ring rotation applications.
2.1. Distinctive Construction
The RE series features a separable inner ring and integrated outer ring configuration [8†L4-L6][13†L12-L13]:
Inner Ring: Split into two separate parts (two-piece design)
Outer Ring: Manufactured as a single, integrated whole
Roller Arrangement: Cylindrical rollers are arranged perpendicularly to each other on the rolling surfaces of 90° V-shaped grooves, separated by spacer retainers [0†L29-L30][14†L10-L11]
Sealing Options: Available in open type (RE) or double-lip sealed type (RE-UU) [8†L7-L11][1†L6-L8]
2.2. Working Principle
Within the RE series crossed roller bearing, cylindrical rollers are positioned at right angles (90°) to one another on V-shaped raceways. Spacer retainers placed between adjacent rollers maintain the proper orientation of each roller, preventing direct contact, tilting, skewing, or locking [0†L29-L30][11†L3-L8]. This design ensures uniform load distribution and stable rotation.
Thanks to this 90° crossed arrangement, a single RE series bearing can simultaneously support loads in all directions, including radial loads, axial loads (from both directions), and overturning moment loads. This eliminates the need for multiple conventional bearings, reducing system complexity and saving space [0†L29-L30][5†L7-L7][11†L3-L8].
3. Key Performance Characteristics
3.1. High Rotational Accuracy (P5 / P4 / P2 Grades)
The RE series achieves the highest precision standards in the industry:
P5, P4, and P2 precision grades are available [0†L7-L8][5†L9-L10][6†L11-L12]
The spacer retainer design prevents roller skewing and eliminates friction between rollers, ensuring smooth rotation without torque fluctuations [11†L12-L16][12†L12-L16]
Because the inner and outer rings are separable, bearing clearance can be adjusted – even under preload, high-precision rotational motion is achieved [11†L17-L19][12†L17-L19]
3.2. High Rigidity (3–4 Times Conventional Bearings)
The crossed roller arrangement provides exceptional rigidity:
The RE series delivers rigidity 3 to 4 times higher than conventional bearing designs [8†L12-L13]
All bearings in this series are delivered with an internal preload, eliminating the need for on‑site gap adjustment [0†L8-L8]
Despite the split inner ring design, the bearing maintains uniform rigidity across the entire structure
3.3. High Load Capacity – Radial, Axial and Overturning Moments Simultaneously
A single RE series bearing handles complex loading scenarios:
Radial Loads – Supports forces perpendicular to the shaft axis [0†L9-L10][6†L12-L13]
Bidirectional Axial Loads – Handles thrust forces from both directions [0†L9-L10]
Overturning Moment (Tilting Moment) Loads – Provides exceptional resistance to moment loads, which is critical for rotary table applications [0†L9-L10][6†L12-L13]
3.4. Thin-Walled / Space-Saving Design
The RE series offers a compact construction that minimizes installation space:
The inner and outer ring dimensions are minimized to the practical limit [8†L11-L12][0†L13-L14]
External dimensions are identical to the RB series, providing interchangeability with common industry standards [5†L6-L6][0†L7-L8]
This thin‑section design is ideal for applications where axial space is at a premium
3.5. Stable Rotation and Low Friction Torque
Operating stability is ensured throughout the bearing's service life:
Spacer retainers maintain consistent roller spacing, preventing torque spikes and ensuring smooth, uniform rotation [11†L12-L16][12†L12-L16]
Unlike conventional types using steel sheet retainers, the RE series does not cause displacement or locking of rollers [11†L15-L17][12†L15-L17]
The result is a stable rotation torque across the entire speed range
3.6. Easy Installation and Handling
The separable inner ring design simplifies assembly:
The split inner ring halves are fixed after the rollers and spacer retainers are installed, preventing the rings from separating [11†L19-L23][12†L19-L23]
Installation bolts and fixing flanges can be finely adjusted during assembly to achieve the ideal load condition [14†L13-L14]
Since the main dimensions are identical to the RB series, no redesign of mating components is necessary
3.7. Adjustable Clearance and Preload
Flexibility in setting preload is a significant advantage:
Because the inner ring is separable, bearing clearance can be precisely adjusted to suit application requirements [11†L17-L19][12†L17-L19]
Even when a preload is applied, high‑precision rotational motion can be achieved
This adjustability allows the bearing to be fine‑tuned for specific stiffness vs. speed requirements
3.8. Premium Material – Carburized Steel
All RE series bearings are manufactured from high‑quality carburized steel:
Excellent impact resistance ensures durability under shock loads [6†L12-L13]
Superior surface wear resistance extends service life in demanding environments
3.9. Wide Size Range
ONA RE series bearings are available in a comprehensive range:
Bore diameter: from 20mm to 600mm [10†L2-L3]
Outer diameter: from 36mm to 700mm [10†L2-L3]
Width (height): from 8mm to 50mm [10†L2-L3]
Please refer to the detailed dimensional tables below for specific model specifications.
4. Applications
The ONA RE series is widely used across various high‑precision industries and is suitable for any application where the outer ring is required to rotate with high accuracy.
4.1. Primary Application Areas
| Application Area | Specific Uses | Why RE Series is Suitable |
|---|---|---|
| Industrial Robots | Joints, swiveling units, rotating sections of manipulators | High rigidity and stable rotation under varying loads; compact design fits limited space [11†L27-L29][15†L5-L7] |
| Machine Tools | Rotary tables (4th/5th axes) of machining centers, horizontal milling machines, vertical grinding machines, rotary surface grinders | High rotational accuracy (P4/P2) for precise positioning; handles axial workpiece weight and radial cutting forces simultaneously [11†L27-L29][14†L15-L17] |
| Precision Rotary Tables | Indexing tables, dividing heads, precision positioning stages | Excellent overturning moment rigidity; adjustable preload for specific stiffness requirements [11†L27-L29] |
| Medical Equipment | CT scanners, surgical robots, precision diagnostic devices | Low friction and smooth rotation; high reliability [11†L27-L29] |
| Measuring Instruments | CMMs, optical inspection systems, coordinate measuring machines | Exceptional rotational accuracy ensures measurement repeatability; extremely low starting torque [11†L27-L29] |
| IC Manufacturing | Wafer handling systems, steppers, inspection equipment, semiconductor manufacturing | Clean room compatibility; stable rotation torque [11†L27-L29] |
| Aerospace & Defense | Radar turrets, aiming systems, optical telescopes | High reliability under demanding conditions [14†L16-L17] |
| Large Equipment | Large radio telescopes, optical telescopes, heavy‑duty rotary indexing tables, continuous casting machines | Wide size range up to 600mm bore diameter; high load capacity [14†L16-L17] |
4.2. Comparison with Other ONA Crossed Roller Bearing Series
ONA offers a complete portfolio of crossed roller bearings. The selection guide below helps you choose the right series for your application:
| Series | Structure | Primary Application | Key Features |
|---|---|---|---|
| RE (Inner Ring Division) | Inner ring split; outer ring integrated | Outer ring rotation | Same dimensions as RB; ideal for high outer ring rotation accuracy [13†L12-L13] |
| RB (Outer Ring Division) | Outer ring split; inner ring integrated | Inner ring rotation | Basic type; maximum rigidity [13†L15-L16] |
| RA (Ultra-Compact) | Outer ring split; thinner than RB | Space‑limited inner ring rotation | Thinner cross‑section than RB; ideal for robots [13†L18-L19] |
| RU (Integrated Rings) | Both rings integrated | Universal rotation (inner or outer) | Easiest installation; mounting holes on both rings [13†L9-L11] |
5. Technical Specifications & Dimensional Data
The tables below provide detailed specifications for standard ONA RE series models, including bore diameter (d), outer diameter (D), roller pitch circle diameter (dp), width (B), chamfer (r), shoulder dimensions (ds and Dh), basic dynamic load rating (Cr) and static load rating (Cor), and weight.
5.1. RE Series – Main Dimensions and Performance Data (Small & Medium Sizes)
5.2. RE Series – Main Dimensions and Performance Data (Large Sizes)
5.3. Naming Convention and Variations
| Suffix | Meaning | Description |
|---|---|---|
| RE | Standard open type | Basic open bearing without seals |
| RE-UU | Double-lip sealed type | Two sides sealed with rubber lip seals – prevents contamination and retains grease [8†L10-L11][1†L6-L8] |
| REV | Full roller type | No spacers; maximum roller complement – maximum load capacity at lower speeds |
| CC0 / C0 | Internal clearance | Specifies radial internal clearance class [1†L6-L8] |
| P5 / P4 / P2 | Precision grade | Higher numbers indicate higher precision [15†L7-L7][1†L8-L8] |
6. Summary of Core Advantages
The following table summarizes the key advantages of the ONA RE series at a glance:
| Core Advantage | Description |
|---|---|
| Precision | Achieves P5, P4, and P2 precision grades [6†L11-L12][5†L9-L10] |
| High Rigidity | Delivers 3–4 times the rigidity of conventional bearings; delivers high rigidity with preload [8†L12-L13] |
| High Load Capacity | Simultaneously withstands radial loads, bidirectional axial loads, and overturning moment loads [0†L8-L10] |
| Space Saving | Thin‑wall design with minimal cross‑section dimensions – saves space in machinery [0†L13-L14] |
| Outer Ring Precision | One‑piece outer ring ensures highest rotational accuracy for outer ring rotation applications [9†L11-L16] |
| Stable Rotation | Spacer retainers prevent roller skewing and friction – provides stable rotation torque [11†L12-L16] |
| Easy Installation | Split inner ring design simplifies handling and assembly [11†L19-L23] |
| Adjustable Clearance | Separable ring design allows clearance and preload adjustment [11†L17-L19] |
| Premium Material | Carburized steel provides excellent impact resistance and wear resistance [6†L12-L13] |
| Wide Size Range | Bore diameters from 20mm to 600mm; custom sizes available upon request [10†L2-L3] |
| THK / IKO Equivalent | ONA RE series is a direct form, fit, and function replacement for THK RE series, IKO RE series (Cross-Roller Ring), and other major brands [11†L9-L11][1†L16-L17] |
7. Interchangeability with International Brands
ONA RE series bearings are manufactured to the same dimensional and performance standards as major global brands, including:
THK RE series – Cross-Roller Ring (RE-type) [11†L9-L11][2†L16-L17]
IKO RE series – CRB/CRBC series equivalents
INA – XSU series equivalents
RIV – RE series equivalents
Due to identical external dimensions, ONA RE series bearings can serve as direct replacements in existing designs without modification to mating components [9†L11-L16].
8. Quality Assurance and Manufacturing Standards
As a product of Luoyang ONA Bearing Co., Ltd., the RE series is manufactured under strict quality control processes:
2014 – Company establishment [3†L1-L3]
P5/P4/P2 – Full precision grade capability [3†L11-L13][15†L7-L7]
20mm – 1500mm – Core production range [3†L12-L13]
ISO 9001 – Quality management system certified
Carburized steel (GCR15 / SUJ2) – Premium bearing steel material standard [1†L8-L8][8†L5-L6]
100% inspection – Every bearing undergoes rigorous inspection for dimensional accuracy, running accuracy, and noise level
9. Customization Options
For specific application requirements not covered by standard RE series models, ONA offers complete customization services:
Non‑standard dimensions – Special bore sizes, outer diameters, or widths
Alternative materials – Stainless steel, special coatings, or other materials upon request
Special precision grades – P2 or higher for ultra‑precision applications [3†L11-L13][15†L7-L7]
Special lubrication – Custom grease types, oil lubrication options, lubrication holes configuration
Special seals – Contact seals, non‑contact seals, or customized sealing solutions
Mounting holes – Custom hole patterns on inner or outer rings [3†L33-L34]
For specific dimensions, parameters, or custom requirements, please contact ONA's sales engineering team for detailed information.
ONA RE Series – Precision When Outer Ring Rotates
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