Keep the evidence with the model shortlist
The models on this page illustrate bearing roles; they are not confirmed replacements for an unspecified machine. Keep the original complete marking, machine position, load and speed duty, temperature, lubricant and mounting arrangement together. Check the candidate's recorded values below and leave unreported parameters unknown.
Check drawings and model records · Investigate a failure before replacing it · Plan installation and force paths
What matters in this application
Joint load cases
Include payload reach, acceleration, emergency-stop loads and the actual duty spectrum.
Support stiffness
Use the bearing's stiffness/preload data together with mounting and housing compliance.
Installation interfaces
Check ring support, screw pattern, locating shoulders and specified clamping.
Which bearing structures make sense?
Crossed-roller supports
Investigate for combined-load rotary supports with a compact axial section.
Check first: Use the exact clearance/preload variant and required mounting support.
Paired angular-contact supports
A possible architecture for an independently designed rotary axis.
Check first: Pairing, span and preload must meet the actual moment and stiffness requirements.
Recommended starting points
These candidates illustrate specific roles and envelopes, not a ranked list or interchangeable set. Review each condition before using a model in a design.
CRB20025C1
200×260×25 mmCrossed-roller rotary support · 25 mm width
A combined-load support architecture for an independently designed large rotary joint.
- Dynamic C
- 75.3 kN
- Static C₀
- 148 kN
- Limiting speed
- 217 rpm
Before selectionLarge rotary-axis envelope references, not universal industrial robot replacement parts. Check the complete clearance/preload specification, moment rating and ring clamping.
Open complete model dataCRB20030C1
200×280×30 mmCrossed-roller rotary support · 30 mm width
A different outside-diameter/width envelope for comparing joint packaging and stiffness requirements.
- Dynamic C
- 133 kN
- Static C₀
- 234 kN
- Limiting speed
- 208 rpm
Before selectionLarge rotary-axis envelope references, not universal industrial robot replacement parts. Do not infer interchangeability or stiffness from shared bore; inspect full load and mounting data.
Open complete model dataCompare the recorded specifications
Different sizes and bearing structures are shown for different duties. C and C₀ are catalogue load ratings, not permissible equipment loads. Limiting speed is not an approved operating speed.
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| Parameter | IKOCRB20025C1 | IKOCRB20030C1 |
|---|---|---|
| Bore d (mm) | 200 | 200 |
| Outside D (mm) | 260 | 280 |
| Recorded width (mm) | 25 | 30 |
| Dynamic C (kN) | 75.3 | 133 |
| Static C₀ (kN) | 148 | 234 |
| Catalogue limiting speed (rpm) | 217 | 208 |
— = not reported, or not directly comparable for a mounted unit. Width conventions differ for inserts, complete units and bearing assemblies; inspect the dimensional drawing. Values are read from the current BearingScope records, not estimated from model numbers.
Work through the selection
- Resolve joint forces and moments for the full reach and duty cycle.
- Choose the bearing architecture from load, stiffness and packaging requirements.
- Check the complete support stiffness, fits, ring retention and lubrication.
- Validate the assembled joint's repeatability, thermal behavior and service limits.
Symptoms worth checking
Joint lost motion
Inspect reduction gear, fasteners, support preload and sensing as a system.
Uneven rotary torque
Review mounting distortion, clamping and lubrication.
Symptoms are investigation prompts, not a diagnosis. Isolate equipment safely and follow its maintenance procedures before inspection.
Have the original designation?
Look up the complete model and suffix before comparing potential alternatives.
Application questions, answered
Does a crossed-roller bearing make a robot more accurate by itself?
No. Accuracy depends on the complete mechanical and control system. Bearing stiffness and running accuracy are only part of it.
Are the two CRB models interchangeable?
No. Their widths and load/stiffness specifications differ. Check the complete design and exact suffix.
Reference basis & recommendation limits
- NSK Automation — Robotics
Application principles are informed by the listed technical references. Model shortlists are BearingScope editorial selections from its database, not manufacturer endorsements or equipment-fit approvals. Confirm the latest exact specification and the complete equipment design before use.