Roller Bearings
Crossed Roller Bearing
A crossed roller bearing is a precision rolling bearing in which cylindrical rollers are arranged alternately at 90 degrees to each other within a single set of V-shaped raceways. This cross-arrangement allows one bearing to simultaneously carry radial loads, bidirectional axial loads, and overturning moments — replacing the conventional combination of a radial bearing and a thrust bearing while achieving a smaller overall cross-section height. Line contact between rollers and raceways provides higher contact rigidity than ball bearings, resulting in less structural deflection under overturning moments and more stable positioning accuracy. Crossed roller bearings are widely used in industrial robot joints and articulated arms, precision rotary tables and indexing stages, harmonic drive and planetary reduction gearboxes, machine tool spindle axes, and high-precision measurement and semiconductor manufacturing equipment. BOM Bearing supplies standard models compatible with THK and IKO dimensional series, as well as custom configurations with integrated internal or external gear rings, custom preload levels, and special sealing.
Product Inquiry
Product Category
Speak To One of Our Experts
Name can't be empty
Email error!
Message can't be empty
Send message
*We respect your confidentiality and all information are protected.
Description
Reviews
Cross Roller Bearings
High Rigidity Compact Cross-Section
Cross roller bearings arrange cylindrical rollers in an alternating perpendicular (X-pattern) configuration between inner and outer rings. Each roller contacts four raceways — transmitting load alternately in radial and axial directions — delivering extremely high rigidity in all load directions within a very compact cross-section. A single cross roller bearing replaces a conventional multi-bearing arrangement, significantly reducing axial envelope and simplifying assembly. Available in CRBC series (inner ring split) and RB series (outer ring split) for flexible mounting.
- Load Direction: Radial, bi-directional axial, and overturning moment loads simultaneously in one unit
- Bore Range: 10 mm to 500 mm+; metric standard dimensions
- High Rigidity: Exceptionally high static stiffness — high C0r relative to Cr — ideal for precision positioning under varying loads
- Precision Grade: P5, P4, P2 (ISO); SP and UP ultra-precision grades available
- Split Ring Options: CRBC series (inner ring split) for easy shaft mounting; RB series (outer ring split) for housing mounting
- Preload: Light preload or zero preload standard; C3 internal clearance options available
Cross Roller Bearings — CRBC Series Dimensions & Load Ratings
Boundary dimensions per manufacturer standard | Load ratings: indicative reference values | Contact us for RB series and sizes not shown
| Designation |
d mm |
D mm |
B mm |
Cr kN |
C0r kN |
Speed r/min (grease) |
|---|---|---|---|---|---|---|
| CRBC5013 | 50 | 80 | 13 | 11.1 | 29.0 | 500 |
| CRBC6013 | 60 | 90 | 13 | 12.6 | 34.5 | 420 |
| CRBC7013 | 70 | 100 | 13 | 14.2 | 40.0 | 370 |
| CRBC8016 | 80 | 110 | 16 | 18.2 | 55.0 | 320 |
| CRBC10020 | 100 | 140 | 20 | 27.5 | 87.0 | 250 |
| CRBC12020 | 120 | 160 | 20 | 32.0 | 110 | 210 |
| CRBC15025 | 150 | 210 | 25 | 51.0 | 188 | 170 |
| CRBC20025 | 200 | 260 | 25 | 64.0 | 258 | 130 |
| CRBC25025 | 250 | 320 | 25 | 72.0 | 310 | 100 |
| CRBC30025 | 300 | 360 | 25 | 90.0 | 410 | 85 |
| CRBC40035 | 400 | 480 | 35 | 160 | 800 | 60 |
| CRBC50050 | 500 | 620 | 50 | 280 | 1500 | 45 |
Custom & Integrated Cross Roller Bearing Solutions
Integrated Assemblies Engineering Support
Beyond standard CRBC/RB catalog sizes, BOM Bearing engineers cross roller bearings and integrated rotary assemblies combining the bearing with output flanges, housings, or shaft components as a single manufactured unit for superior compactness and precision.
- Integrated Assemblies: Cross roller bearing integrated with output flange, hollow shaft, or rotary table plate as one machined unit — more compact structure, smaller envelope, higher moment load capacity
- Precision Advantage: One-piece machining eliminates assembly stack-up errors, delivering higher combined accuracy than separately assembled components — critical for robot joint and rotary table precision
- Dimension Customization: Non-standard bore, OD, and width dimensions outside catalog ranges; special cross-section proportions
- Precision Grade Selection: P5, P4, P2, SP, UP; precision class matched to application positioning requirements
- Material & Preload Options: Bearing steel standard; stainless steel available; light preload, zero preload, or specific C3 clearance
Applications
Industrial Robots & Articulated Arms
Compact joint bearings for 6-axis robots and SCARA robots, carrying combined radial, axial, and moment loads within the joint envelope.
Precision Rotary Tables & CNC Machining
High rigidity under cutting forces with minimal deflection; enables precision interpolated 4th and 5th axis machining.
Semiconductor Wafer Handling
Precision alignment stages and wafer inspection equipment requiring sub-micron positioning repeatability.
Medical Robotics & Imaging
Compact, high-stiffness bearings for minimally invasive surgical robots and medical imaging equipment requiring smooth rotation.
About BOM Bearing
BOM Bearing is a professional manufacturer and supplier of cross roller bearings, delivering high-rigidity rotary solutions for industrial robots, precision machinery, semiconductor equipment, and medical systems worldwide.
- Quality Assurance: ISO 9001 certified manufacturing with strict quality control at every production stage
- Wide Size Range: CRBC and RB series from 50 mm to 500 mm bore; custom non-standard sizes available
- Custom & Integrated Solutions: Application-specific assemblies with integrated flanges, shafts, and housings
- Technical Support: Professional engineering team for load analysis, precision grade selection, and integrated assembly design
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery
_1770101839_WNo_400d600.webp)
Frequently Asked Questions (FAQ)
How do cross roller bearings differ from conventional radial bearings?
Conventional radial bearings use balls or rollers arranged in a single plane and carry primarily radial or axial loads. Cross roller bearings use cylindrical rollers in an alternating perpendicular (X) arrangement, where each roller carries load in both radial and axial directions simultaneously. This produces very high rigidity in all directions, very high static load capacity (large C0r), and the ability to support combined radial, axial, and moment loads in a single compact row.
What is the difference between CRBC and RB series?
The CRBC series has a split inner ring — the inner ring is divided into two halves, making it easy to mount onto a shaft without needing to pass the entire bearing over the shaft end. The RB series has a split outer ring instead, which simplifies installation into a housing bore. The choice depends on whether the shaft or the housing is the fixed reference for assembly.
Why is C0r (static load rating) especially important for cross roller bearings?
Because cross roller bearings are frequently used in low-speed, high-stiffness applications such as rotary tables and robot joints, where the primary concern is elastic deformation under static or quasi-static loads rather than fatigue life. A high C0r relative to Cr means the bearing can resist large loads with minimal deflection, which directly translates to positional accuracy under load.
What is an integrated cross roller bearing assembly?
An integrated assembly combines the cross roller bearing with output flanges, hollow shaft, or rotary plate as a single machined component. This eliminates the clearances and stack-up errors introduced by assembling separate parts, producing a more compact unit with higher precision and higher moment load capacity.
What precision grades are available?
BOM Bearing supplies cross roller bearings in P5, P4, P2 precision grades per ISO, as well as SP (Super Precision) and UP (Ultra Precision) equivalent grades. Higher precision grades provide tighter dimensional tolerances, lower runout values, and better bore/OD roundness — essential for applications demanding sub-micron positioning accuracy.
0 Comments
Share your thoughts
Showing 6
of 0
reviews
Your rating
Your review *
Your Name *
Enter your Name
Your Email *
Enter your Email
Submit
Contact Us
Get in Touch with Us
Name can't be empty
Email error!
Message can't be empty
error
Send Your Message