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
Subsystem identification
Identify the exact shaft and bearing arrangement; do not transfer a generator-size example to the main shaft.
Load spectrum
Use the equipment's validated load cases, transient peaks, deflection and temperature ranges rather than rated power alone.
Reliability and service
Include lubrication delivery, contamination, monitoring, mounting logistics and the approved equipment specification.
Which bearing structures make sense?
Main-shaft bearing systems
Purpose-designed spherical or tapered-roller systems depend on the turbine architecture.
Check first: Require the turbine-specific load spectrum and design approval; a large bore is not evidence of compatibility.
Gearbox roller supports
Investigate cylindrical/tapered/spherical arrangements for the identified gear stage.
Check first: Minimum load, transient conditions and axial-force paths differ by stage.
Generator bearing supports
Evaluate radial support, axial location and electrical-current protection together.
Check first: An ordinary steel bearing record does not establish an insulated generator solution.
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.
240/560 BC
560×820×258 mmMain-shaft catalogue reference · 560 mm bore
The database explicitly describes this record as a spherical roller bearing for wind-turbine main shafts.
- Dynamic C
- 7530 kN
- Static C₀
- 14000 kN
- Limiting speed
- 50 rpm
Before selectionThis identifies an application family, not an approved turbine fit. Confirm the exact arrangement, load spectrum and OEM specification.
Open complete model dataNU 2220 ECJ
100×180×46 mmGearbox architecture reference · 100 mm bore
A cylindrical-roller record for understanding a possible radial/floating gear-stage support.
- Dynamic C
- 380 kN
- Static C₀
- 450 kN
- Limiting speed
- 4500 rpm
Before selectionNo specific wind turbine or gear stage is approved here. Verify the actual stage design and axial-location system.
Open complete model data6320
100×215×47 mmGenerator-size reference · 100 mm bore
A deep-groove record useful for comparing the envelope and ratings of a separately specified generator support.
- Dynamic C
- 174 kN
- Static C₀
- 140 kN
- Limiting speed
- 4300 rpm
Before selectionThis base record is not an electrical-insulation specification; verify the complete generator bearing variant.
Open complete model data6320
100×215×47 mmCross-brand reference · same nominal envelope
Provides a second 6320 catalogue record for comparing published data without treating brands as automatic substitutes.
- Dynamic C
- 177 kN
- Static C₀
- 137 kN
- Limiting speed
- 4250 rpm
Before selectionConfirm clearance, seals, insulation, accuracy and equipment approval in addition to nominal dimensions.
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.
Swipe to see all models →
| Parameter | SKF240/560 BC | SKFNU 2220 ECJ | SKF6320 | FAG6320 |
|---|---|---|---|---|
| Bore d (mm) | 560 | 100 | 100 | 100 |
| Outside D (mm) | 820 | 180 | 215 | 215 |
| Recorded width (mm) | 258 | 46 | 47 | 47 |
| Dynamic C (kN) | 7530 | 380 | 174 | 177 |
| Static C₀ (kN) | 14000 | 450 | 140 | 137 |
| Catalogue limiting speed (rpm) | 50 | 4500 | 4300 | 4250 |
— = 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
- Identify the turbine subsystem, original full bearing specification and locating arrangement.
- Use validated duty-cycle and extreme-load cases to evaluate the complete shaft/housing/bearing system.
- Check fatigue, static safety, minimum load, lubrication and thermal/electrical conditions for that position.
- Obtain equipment-specific engineering approval, then follow the approved installation, monitoring and service process.
Symptoms worth checking
Main-shaft vibration or debris trend
Escalate through the turbine's monitoring and inspection procedure; do not infer root cause or remaining life from a generic frequency alone.
Generator fluting
Investigate shaft current, grounding and the specified insulated bearing arrangement.
Gear-stage damage under variable duty
Review transient loads, lubrication, alignment and contact conditions within a system-level failure investigation.
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
Are these approved replacement bearings for a particular turbine?
No. Only the main-shaft record explicitly names that application family; none of these entries establishes a fit for a specific turbine model or power rating.
Where are pitch and yaw bearings?
Pitch and yaw use specialized large bearing systems with oscillating duty and additional interfaces. This shortlist does not invent standard catalogue substitutes for those positions.
Can SKF 6320 and FAG 6320 be exchanged automatically?
Matching nominal dimensions are only an initial screen. Full suffixes, operating clearance, lubrication, electrical protection and the generator's approved specification still need confirmation.
Reference basis & recommendation limits
- NSK — Wind Turbines
- Timken — UltraWind Tapered Roller Bearings
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.