The RB15025 cross roller bearing measures 150 mm in bore diameter, 210 mm in outside diameter and 25 mm in width. Its crossed cylindrical roller arrangement supports radial loads, axial loads in both directions and overturning moments within one compact bearing assembly.
With a basic dynamic radial load rating of 76.8 kN and a basic static radial load rating of 128 kN, RB15025 is suitable for robot positioners, CNC rotary tables, welding manipulators, direct-drive mechanisms and precision automation equipment.
The integrated inner ring and split outer ring support accurate inner-ring rotation and space-efficient installation. Accuracy, clearance, preload, sealing and lubrication configurations can be confirmed according to the operating conditions and approved mounting drawing.
RB15025 Cross Roller Bearing Overview
The RB15025 cross roller bearing is a precision rotary bearing with a 150 mm bore, 210 mm outside diameter and 25 mm width. It combines a large through-bore with high radial, axial and moment-load capability in a compact single-bearing arrangement.
Cylindrical rollers are arranged alternately at 90 degrees between the inner and outer raceways. This crossed arrangement enables RB15025 to support radial loads, axial loads in both directions and overturning moments.
The bearing uses an integrated inner ring and a split outer ring. This structure is commonly selected for mechanisms requiring accurate inner-ring rotation, high rigidity and controlled angular displacement.
Explore other dimensions in our RB Series Cross Roller Bearings range.
GCr15, GCr15SiMn or 100Cr6, subject to specification
*Mounting dimensions are catalogue references. Final shaft, housing, flange, bolt arrangement and chamfer dimensions must follow the approved LYDL drawing supplied with the quotation or order.
Basic load ratings are calculation references rather than direct maximum operating loads. Radial load, axial load, overturning moment, shock load and the required safety factors must be evaluated together.
Structure and Operating Principle
Adjacent rollers inside the RB15025 are positioned with their axes crossing at right angles. The cylindrical rollers make line contact with the raceways, providing high rigidity and limited elastic deformation under load.
This internal arrangement enables the bearing to carry:
Radial loads
Axial loads in both directions
Overturning moment loads
Combined radial, axial and moment loads
The 178 mm roller pitch circle distributes load around a relatively large diameter. The 25 mm bearing width and 30 mm radial cross-section provide substantially greater rigidity and load capacity than the thin RB15013 configuration.
The split outer-ring retaining screws are generally intended to prevent separation during transportation and installation. They must not be treated as structural mounting fasteners unless the approved drawing specifically states otherwise.
Key Advantages of RB15025
Balanced Capacity and Installation Size
RB15025 provides considerably more load capacity than RB15013 while remaining smaller and lighter than RB15030. This makes it a balanced option for medium-to-heavy rotary applications.
150 mm Through-Bore
The large bore provides space for hollow shafts, cables, pneumatic lines, hydraulic passages, drive components or optical systems passing through the rotary axis.
High Static Capacity
The 128 kN basic static radial rating supports applications exposed to substantial stationary loads and moment loads, provided that the complete equivalent-load and safety-factor calculations are satisfied.
Resistance to Overturning Moments
The crossed roller arrangement and 178 mm roller pitch circle help resist tilting deformation in robot positioners, rotary tables and overhung-load mechanisms.
Combined-Load Support
One bearing can support radial, bidirectional axial and moment loads, potentially reducing the need for a multiple-bearing arrangement.
Configurable Accuracy and Preload
Accuracy, internal clearance, preload, sealing and lubrication can be specified according to the required rigidity, running torque, speed and positioning performance.
Typical RB15025 Applications
RB15025 can be considered for:
Industrial robot base and waist axes
Robot positioners
Welding positioners and manipulators
CNC rotary tables
Machine-tool indexing tables
Precision rotary actuators
Direct-drive rotary mechanisms
Semiconductor manufacturing equipment
Optical inspection systems
Medical imaging equipment
Measuring and testing systems
Automated assembly machinery
The final model selection must consider load magnitude, load direction, lever-arm length, overturning moment, speed, operating cycle, required life, mounting rigidity, temperature and permissible running torque.
Choose RB15013 when low mass and minimum radial and axial space are more important than high load capacity.
Choose RB15025 when the application requires substantially higher rigidity and load capacity but does not require the larger 230 mm outside diameter of RB15030.
Choose RB15030 when higher load capacity, shock resistance or structural stiffness justifies its larger dimensions and mass.
For related products, see the RB12025 Cross Roller Bearing and RB3510 Cross Roller Bearing.
Engineering Selection Notes for RB15025
Effect of Overhung Loads
A radial or axial load applied at a distance from the bearing centre creates an overturning moment. A moderate external force can therefore produce a significant bearing load when the lever arm is long.
The moment should be calculated before bearing selection: M = F × L Where:
M is the overturning moment
F is the applied force
L is the distance from the load to the bearing centre
Moment Contribution to Equivalent Load
Crossed roller bearing calculation methods commonly convert the moment into an equivalent force term using: 2M / Dpw For RB15025, Dpw is 178 mm. The units of M and Dpw must be consistent.
The result must then be combined with radial and axial loads using the applicable manufacturer’s calculation factors. This simplified explanation does not replace the complete engineering calculation.
Housing and Flange Rigidity
RB15025 cannot provide its intended system rigidity if the surrounding housing or clamping flange deforms significantly.
The installation design should consider:
Housing wall thickness
Flange thickness
Bolt-circle diameter
Bolt spacing
Mounting-surface flatness
Shaft and housing fits
Load-transfer path
Overhung-load direction
For P4 or P2 applications, mounting accuracy and structural rigidity can be as important as the bearing accuracy grade.
RB15025 Common Configurations and Suffix Guide
Suffix systems are manufacturer-specific. Seal, clearance, preload and accuracy codes must be interpreted according to the applicable catalogue and purchase specification.
The following RB15025 codes are enquiry examples. Final LYDL designations and numerical requirements must be confirmed in the quotation.
Both-side seals with controlled negative clearance or preload
Preload and running torque
RB15025UUC1
Both-side seals with specified C1 clearance
Manufacturer-specific limits
RB15025UUP5
Both-side seals with P5 accuracy
Controlled surfaces and inspection limits
RB15025UUP4
Both-side seals with P4 accuracy
Runout and dimensional requirements
RB15025UUCC0P4
Both-side seals, controlled preload and P4 accuracy
Complete approved specification
RB15025UUCC0P2
Both-side seals, controlled preload and P2 accuracy
Engineering review and availability
Seal Suffixes
No suffix: Generally indicates an open configuration, but the supplied condition must be confirmed.
U: Commonly indicates a seal fitted on one side. The required side should be specified.
UU: Commonly indicates seals fitted on both sides.
DD: Used by NSK for seals fitted on both sides.
E: Used by NSK for an open bearing.
Clearance and Preload Suffixes
CC0: Used in the THK system for controlled negative clearance or preload.
C0: A specified clearance category. In the THK system, C0 indicates positive clearance rather than zero clearance.
C1: A manufacturer-specific positive-clearance category.
C8: Used in the NSK NRXT system for negative clearance.
T1, C1 and C2: Clearance classifications used in the IKO crossed roller bearing system.
Preload should be selected according to rigidity, running torque, speed, temperature and installation accuracy. Excessive preload may increase heat generation and reduce service life.
Accuracy Suffixes
P6: Accuracy class 6
P5: Accuracy class 5
P4: Accuracy class 4
P2: Accuracy class 2
PE5, PE4 or PE2: THK-style designations combining rotational and dimensional accuracy requirements
A higher accuracy grade will not correct an inaccurate shaft, flexible housing or distorted clamping flange.
Identical boundary dimensions do not guarantee identical performance or direct interchangeability.
Before replacing another brand, compare:
Complete model number and suffixes
Ring construction
Roller complement or separator design
Shoulder and chamfer dimensions
Load ratings
Clearance or preload
Accuracy class
Sealing and lubrication
Starting and running torque
Mounting and clamping method
Cross-brand model numbers are provided only for preliminary identification and engineering comparison.
Material, Sealing and Lubrication
Depending on the confirmed specification, bearing-steel options can include GCr15, GCr15SiMn or 100Cr6.
Open bearings require appropriate external sealing and lubrication. Sealed configurations provide additional protection against dust ingress and grease leakage but may produce higher starting and running torque.
Lubricant selection should consider:
Rotational speed
Applied load
Operating cycle
Temperature range
Required running torque
Environmental contamination
Relubrication interval
Compatibility with surrounding materials
Do not mix greases with unknown base-oil or thickener compatibility.
Inspection and Quality Control
Inspection requirements should be agreed before production. Depending on the order specification, the inspection scope may include:
Bore and outside-diameter measurement
Bearing width inspection
Dimensional and rotational runout
Radial clearance or preload verification
Starting and running torque
Rotation smoothness
Raceway and surface-condition inspection
Hardness verification
Cleanliness inspection
Laser marking verification
Appearance and packaging inspection
Material certificates, inspection records or additional documentation should be requested before order confirmation.
Installation Recommendations
To preserve the rigidity and accuracy of RB15025:
Clean the bearing and all mounting components before installation.
Remove burrs, raised edges and contamination from mating surfaces.
Verify shaft and housing dimensions against the approved drawing.
Confirm that the housing and clamping flange have adequate rigidity.
Apply installation force only to the ring being fitted.
Never transmit mounting force through the rollers.
Support the split outer ring during handling.
Tighten flange bolts gradually in a diagonal sequence.
Apply uniform clamping force around the circumference.
Check starting torque, running torque and rotation smoothness.
Protect open bearings against contamination and lubricant loss.
Measure final runout after completing the rotary assembly.
For a bearing of this size, uneven flange pressure or mounting-surface deformation may produce measurable changes in running torque and runout.
Information Required for Selection
Please provide:
Radial and axial loads
Overturning moment
Lever-arm dimensions
Shock or vibration loads
Maximum and continuous speed
Operating cycle
Required service life
Required rotational accuracy
Permissible running torque
Clearance or preload requirement
Shaft, housing and flange drawings
Operating temperature
Sealing and lubrication requirements
Quantity and destination
This information allows the bearing and surrounding structure to be evaluated as one system.
Why Source RB15025 From LYDL?
LYDL supplies precision bearings for robotics, machine tools, automation equipment, measuring systems and industrial rotary mechanisms. Luoyang Deeplink Technology Co., Ltd. integrates machining, grinding, assembly, inspection, packaging and international order support.
Available project support includes:
Standard RB-series production
Accuracy-grade selection
Clearance and preload control
Seal and grease configuration
Dimensional inspection
Rotational-accuracy inspection
Running-torque verification
Laser marking
Application-based selection support
Export packaging
OEM and customized bearing solutions
Engineering FAQ for RB15025 Applications
When is RB15025 a better choice than the thinner RB15013?
RB15025 is preferable when the mechanism requires substantially higher load capacity, moment rigidity and resistance to tilting deformation. RB15013 is more appropriate when minimum mass and installation space are the main design priorities.
When should RB15030 be considered instead of RB15025?
RB15030 should be evaluated when the application has higher calculated equivalent loads, stronger shock loads or greater structural-rigidity requirements. It requires a 230 mm housing diameter, 30 mm axial width and greater rotating mass.
Why can a moderate external force create a high load on RB15025?
If the external force acts far from the bearing centre, the long lever arm creates a substantial overturning moment. Bearing selection must therefore consider both the force and its distance from the bearing centre.
How is the 178 mm roller pitch circle used in a moment-load calculation?
Manufacturer calculation methods commonly convert the overturning moment into an equivalent force term using 2M/Dpw. For RB15025, Dpw is 178 mm. The result is then combined with radial and axial loads using the applicable load factors.
Can the 128 kN static rating be used as the permissible machine load?
No. It is a basic static radial load rating. The actual radial, axial and moment loads must first be converted into an equivalent static load. A suitable static safety factor must then be applied according to shock, vibration and accuracy requirements.
Why might a P2 bearing fail to deliver P2-level installed accuracy?
Shaft runout, housing deformation, flange flatness, bolt tightening and assembly contamination can reduce installed accuracy. A high bearing grade cannot compensate for an inaccurate or flexible mounting structure.
Is RB15025 suitable for a direct-drive rotary axis?
It may be suitable if its calculated life, moment rigidity, running torque, speed and temperature remain within the confirmed specification. Motor heat, continuous operating speed and encoder accuracy should be considered together with the bearing.
Are CRB15025 and NRXT15025 drop-in replacements for RB15025?
Not automatically. Although they share nominal boundary dimensions, their published load ratings, weights, internal designs, suffixes and mounting recommendations differ. The complete model numbers and drawings must be compared before replacement.
Which inspection documents are most useful for an OEM approval process?
Useful documentation may include dimensional inspection results, rotational-runout data, clearance or preload verification, running-torque records, material certification and final marking records. Required documents should be specified before production.
Request an RB15025 Quotation
Send the complete bearing designation, shaft and housing drawing, operating loads and accuracy requirements for technical confirmation. Email:sales@luoyangdeeplink.comPhone / WhatsApp / WeChat: +86 180 3700 3779 Website:www.lydl-bearing.com
THK, IKO, NSK and their respective product designations are trademarks or identifiers of their respective owners. They are mentioned only for technical identification and preliminary engineering comparison.
LYDL and Luoyang Deeplink Technology Co., Ltd. are independent and are not affiliated with, authorized by or endorsed by these manufacturers.
Final specifications, interchangeability, load calculations and mounting dimensions must be confirmed using the approved LYDL drawing and the customer’s actual operating conditions.
The final model selection must consider load magnitude, load direction, lever-arm length, overturning moment, speed, operating cycle, required life, mounting rigidity, temperature and permissible running torque.
