The RA20013 cross roller bearing is a large-bore thin-section bearing with a 200 mm bore, 226 mm outside diameter and 13 mm width. It provides a large central passage while maintaining a compact and lightweight rotary structure.
Its crossed cylindrical rollers support radial, bidirectional axial and overturning moment loads in one bearing position. Compared with 8 mm-wide RA models, the 13 mm section provides higher load capacity and greater structural support.
The one-piece inner ring is normally selected as the rotating ring. The separable outer ring requires accurate and uniform clamping by the housing.
LYDL supplies the RA20013 cross roller bearing in open, sealed, C0 and CC0 configurations. Higher accuracy, special grease, controlled clearance and inspection reports are available after technical confirmation.
Send your quantity, loads, moment, speed and accuracy requirements for an LYDL drawing review and quotation.
RA20013 Cross Roller Bearing Overview
The RA20013 cross roller bearing provides a 200 mm through-bore within a 226 mm outside diameter.
Its width is 13 mm. This creates a 13 mm radial section on each side while preserving a large central passage.
Cylindrical rollers are arranged alternately at 90 degrees between the raceways. One bearing position can support radial, bidirectional axial and overturning moment loads.
Spacer retainers separate adjacent rollers. They reduce roller-to-roller friction and help maintain stable rotational torque.
RA20013 uses a one-piece inner ring and a separable outer ring. The inner ring is normally selected as the rotating ring when running accuracy is important.
RA20013 Cross Roller Bearing Specifications
The principal RA20013 cross roller bearing dimensions and catalogue ratings are listed below.
Parameter
RA20013 specification
Bore diameter, d
200 mm
Outside diameter, D
226 mm
Width, B
13 mm
Radial section, (D − d) ÷ 2
13 mm
Roller pitch circle, dp
212 mm
Lubrication-hole reference, a × b
2.5 × 1.6 mm
Minimum corner radius, r min
0.8 mm
Maximum shaft shoulder, ds
205 mm
Minimum housing shoulder, Dh
219 mm
Basic dynamic radial load rating, C
25.8 kN
Basic static radial load rating, C0
54.7 kN
Approximate mass
0.71 kg
Ring structure
One-piece inner ring and separable outer ring
Standard lubrication
Grease lubrication
Standard-grease temperature range
−15°C to +80°C
The listed load ratings are basic radial catalogue values. They are not direct allowable limits for combined-load operation.
Bearing life depends on radial load, axial load, overturning moment, speed, duty cycle, lubrication and required reliability.
The static rating must not be used as an allowable operating load or moment value without calculation.
Confirm the approved LYDL drawing before machining the shaft, housing or retaining cover.
What Makes RA20013 Different?
Large 200 mm Through-Bore
The RA20013 cross roller bearing provides a large central opening for cables, optical components, pneumatic lines or a hollow transmission shaft.
It is suitable for equipment that must route multiple services through the center of rotation.
13 mm Section Instead of 8 mm
Smaller RA models from RA5008 to RA15008 generally use an 8 mm width.
RA20013 uses a 13 mm width and radial section. This provides more room for the rollers and greater load-carrying capability.
Higher Load Ratings
RA20013 has a basic dynamic radial rating of 25.8 kN and a basic static radial rating of 54.7 kN.
These values are substantially higher than those of the 8 mm-wide RA models. Final selection still requires a combined-load and life calculation.
Compact Mass for a 200 mm Bore
The bearing weighs approximately 0.71 kg.
This remains relatively light for a precision bearing with a 200 mm bore, helping control the mass of large rotary modules.
Combined-Load Support
The crossed rollers support radial, bidirectional axial and moment loads in one bearing position.
This can simplify a large-aperture rotary mechanism and reduce the number of separate bearing positions.
Typical RA20013 Cross Roller Bearing Applications
The RA20013 cross roller bearing is suitable for:
Large hollow-shaft robot joints
Robot shoulder and base positioning modules
Semiconductor wafer-processing equipment
Large-aperture optical positioning stages
Medical and laboratory positioning systems
Direct-drive rotary modules
Precision inspection and metrology platforms
Antenna and sensor pointing mechanisms
The 200 mm opening provides space for large cable bundles, optical paths, pipes or hollow drive components.
RA20013 is most useful where a large passage and compact bearing section are required together.
It should not be selected from bore size alone. Loads, moment arm, accuracy, torque and surrounding structural rigidity must also be reviewed.
For additional technical guidance, visit the LYDL Cross Roller Bearing Guide and Cross Roller Bearing Product Range.supports compact rotary motion in robot joints, optical stages, semiconductor equipment and inspection systems.
Need an RA20013 technical review? Send LYDL your quantity, radial load, axial load, moment load, speed and duty cycle.
Please include the rotating ring, accuracy, clearance or preload, sealing, lubricant and operating temperature.
We will review the RA20013 cross roller bearing configuration and provide a quotation with the controlled drawing.
RA20013 Variants and Suffixes
Suffix conventions can vary between manufacturers. Confirm the complete designation and technical requirements before ordering.
Improves grease retention and contamination protection
RA20013C
Single-split outer-ring type
Structure and mounting drawing must be confirmed
RA20013CUU
Single-split type with two seals
Confirm seal drag and operating torque
C0
Standard or positive radial clearance
Generally favors lower rotational resistance
CC0
Controlled negative clearance or preload
Improves rigidity but increases mounting sensitivity
P6T / P5T
Specified rotational-accuracy options
Confirm the rotating ring and inspection method
P4 / P2 custom
LYDL high-precision option
Requires approved accuracy and inspection criteria
UU seals improve grease retention and provide additional contamination protection.
Seal contact can increase starting torque. Open bearings may be preferable in clean equipment requiring minimum rotational resistance.
CC0 preload can improve rigidity and positioning stability. Excessive preload can increase torque, temperature and housing sensitivity.
An LYDL RA20013 cross roller bearing should be configured according to the application rather than by suffix alone.
Short Brand Naming Guide
Different manufacturers may use different designations for a similar 200 × 226 × 13 mm bearing envelope.
Brand or supplier group
Common designation
Important note
THK
RA20013 / RA20013UU
Standard RA-series naming
IKO
CRBS20013, CRBS20013 A UU or CRBS20013 V
Cage, separator and full-complement versions differ
LYDL
RA20013, RA20013UU, RA20013UUCC0
Accuracy and clearance follow the approved order
Some aftermarket suppliers
XRA20013 or SRA20013
Supplier-specific prefix; drawing comparison is required
The IKO “V” designation generally identifies a different internal roller configuration. Its load ratings should not be applied to standard CRBS20013 or RA20013.
Similar names and dimensions do not guarantee identical load ratings, preload, accuracy, seals or torque.
Choose the RA12008 Cross Roller Bearing when a 120 mm passage and an 8 mm width are sufficient.
Select the RA14008 Cross Roller Bearing when a 140 mm opening is required but the mechanism must retain an 8 mm width.
RA20013 provides a much larger bore and higher ratings. It also requires 13 mm of axial installation space.
Installation and Housing Requirements
The thin rings of the RA20013 cross roller bearing depend on the surrounding structure for correct support.
Control housing roundness, shaft coaxiality, shoulder perpendicularity and retaining-cover flatness.
Use 205 mm as the catalogue maximum shaft-shoulder diameter. Use 219 mm as the catalogue minimum housing-shoulder diameter.
Confirm both dimensions against the final LYDL drawing.
The complete housing must be larger than the 226 mm bearing outside diameter.
Allow sufficient material for the housing wall, retaining cover and fasteners.
Because of the larger diameter, retaining-cover rigidity and screw spacing are important.
A flexible cover can apply uneven pressure and produce local changes in preload, torque and runout.
Clean all mating surfaces and remove burrs before installation. Do not force the bearing into a distorted housing.
Tighten the retaining screws gradually in a diagonal sequence. Uniform tightening helps prevent deformation of the separable outer ring.
After installation, rotate the inner ring slowly. Check starting torque, smoothness, noise and runout before connecting the drive.
Abnormal installed torque may result from:
Retaining-cover deflection
Uneven screw tightening
Housing roundness error
Shaft and housing misalignment
Excessive interference or preload
Seal friction
Excessive or unsuitable grease
These factors should be checked before identifying the bearing as defective.
Effective Bore and Service Routing
The nominal bearing bore is 200 mm. The usable opening in the finished machine may be smaller.
Shaft shoulders, retaining components, fasteners and cable supports can reduce the final passage.
Check the complete assembly section before defining cable, pipe or optical-aperture dimensions.
Cables and hoses should be supported so that they do not rub against the rotating ring or damage the bearing seals.
Accuracy and Rotational Torque
RA20013 is normally used with inner-ring rotation.
Accuracy requirements should identify the rotating ring, measured surface and inspection method.
A high-accuracy bearing cannot compensate for a flexible housing or uneven outer-ring clamping.
Installed torque should be checked after the retaining cover reaches its final tightening condition.
For direct-drive equipment, provide the motor’s available starting torque before choosing seals or CC0 preload.
Lubrication and Operating Conditions
Standard RA20013 configurations normally use grease lubrication.
Grease viscosity and fill quantity should match the load, speed, temperature and required rotational resistance.
The published −15°C to +80°C range relates to a standard grease configuration.
Vacuum, cleanroom, low-temperature and high-temperature applications require separate grease, seal and material confirmation.
Open bearings require a clean enclosure. Sealed versions improve protection but are not maintenance-free under every duty cycle.
LYDL Manufacturing and Quality Control
LYDL controls ring material, heat treatment, raceway grinding, roller sorting, assembly clearance and final inspection.
Inspection for an RA20013 cross roller bearing can include:
Bore, outside diameter and width
Raceway geometry and surface condition
Radial clearance or preload
Inner-ring rotational runout
Starting and running torque
Noise and rotational smoothness
Seal condition and grease quantity
Marking and packaging inspection
Roundness, flatness and torque control are important for a 226 mm bearing that is only 13 mm wide.
Material certificates, dimensional reports and accuracy records can be supplied when agreed before production.
LYDL uses anti-rust protection and shock-resistant export packaging. Concentrated pressure on the thin outer ring is avoided.dimensions, clearance, runout and rotational torque before protective export packaging.
Interchange and Cross-Reference Guidance
RA20013 and IKO CRBS20013 share nominal boundary dimensions of 200 × 226 × 13 mm.
Their published standard load ratings and mass are not identical. CRBS20013 V uses another internal configuration and has different ratings again.
A matching bore, outside diameter and width do not prove complete interchangeability.
Before replacement, provide:
Existing manufacturer and complete model
All suffixes
Cage, separator or full-complement structure
Shaft and housing drawing
Required clearance or preload
Rotating ring
Loads, moment and speed
Lubrication and operating environment
LYDL will compare the existing product with the RA20013 cross roller bearing and issue a controlled drawing for approval.
RA20013 Cross Roller Bearing FAQ
1. Why is RA20013 13 mm wide instead of 8 mm?
The larger 13 mm section provides more room for the internal rollers and raceways.
This produces a substantial increase in load capacity compared with the smaller 8 mm-wide RA models.
2. Does a 200 mm bore mean RA20013 is suitable for heavy machinery?
Not automatically.
RA20013 has higher ratings than smaller RA models, but actual suitability depends on combined loads, moment arm, shock, housing rigidity and required life.
3. Can the complete 200 mm bore be used for cables or pipes?
The bearing bore is 200 mm, but the usable machine opening may be reduced by shafts, shoulders, fasteners and cable guides.
Check the complete assembly drawing before defining the service-routing diameter.
4. Can the 54.7 kN static rating be used as the maximum moment load?
No. The static rating is a basic radial reference value.
Moment capacity must be evaluated from bearing geometry, moment arm, preload and surrounding structural stiffness.
5. Why is retaining-cover stiffness important at 226 mm OD?
A wide but flexible cover can deflect between screws and apply uneven force to the separable outer ring.
This can change clearance, torque and rotational accuracy.
6. Can the outer ring rotate?
RA20013 is normally used with inner-ring rotation because its outer ring is separable and housing-clamped.
For outer-ring rotation, evaluate an integrated-ring RAU design or another suitable structure.
7. Can RA20013 directly replace IKO CRBS20013?
The nominal dimensions match, but the standard ratings, mass and available internal configurations differ.
Compare the complete suffix, roller structure, clearance, accuracy, seals and drawings before replacement.
8. Why does CRBS20013 V have different load ratings?
The V suffix identifies a different roller arrangement from the standard caged CRBS20013.
Load ratings from the V version should not be used for RA20013 or another internal structure.
Request an RA20013 Quotation
Send your application data or existing drawing to receive an RA20013 cross roller bearing quotation.
LYDL can review open, sealed, clearance-controlled and customized precision configurations.
Provide quantity, loads, moment, speed, rotating ring, accuracy, clearance, sealing, lubricant and temperature for an efficient technical review.
ISO 492:2023 — geometrical product specifications and radial-bearing tolerances.
Engineering note: Catalogue values support preliminary selection only. Final life, fit, accuracy, clearance and interchangeability require complete application data and an approved LYDL drawing.
