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
Drive and rotor
Record direct or belt drive, wheel weight, pulley position, speed range and balance condition.
Alignment and growth
Check bearing span, shaft deflection and the path available for axial thermal expansion.
Maintenance environment
Assess dust, moisture, lubricant temperature and access for relubrication without overfilling the housing.
Which bearing structures make sense?
Deep groove ball bearings
A starting point for compact, adequately aligned supports.
Check first: Consider both belt reactions and any fan thrust; a larger seal adds neither alignment capability nor balance.
Self-aligning ball bearings
Investigate for lighter-load supports where angular accommodation is needed.
Check first: Check axial-load limitations and housing/seal alignment separately.
Spherical roller bearings
Investigate for more heavily loaded industrial fan supports.
Check first: Provide a deliberate expansion strategy and check minimum load; not every spherical bearing arrangement floats internally.
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.
6205
25×52×15 mm25 mm shaft · compact fan support
A deep-groove reference for a compact fan support with controlled alignment and suitable loading.
- Dynamic C
- 17.5 kN
- Static C₀
- 7.85 kN
- Limiting speed
- 13000 rpm
Before selectionMatch the required sealing and lubrication variant; this base record does not specify the entire fan assembly.
Open complete model data6306
30×72×19 mm30 mm shaft · larger deep-groove support
A larger radial envelope to evaluate for a separately sized 30 mm fan shaft.
- Dynamic C
- 30.5 kN
- Static C₀
- 16.2 kN
- Limiting speed
- 13700 rpm
Before selectionValidate belt pull, axial demand and hot operating clearance.
Open complete model data1205
25×52×15 mm25 mm shaft · self-aligning ball support
Introduces a self-aligning-ball option where the load level and permitted angular movement suit that design.
- Dynamic C
- 15.1 kN
- Static C₀
- 3.3 kN
- Limiting speed
- 12000 rpm
Before selectionThis is not a cure for rotor imbalance; verify the permissible angle, axial load and housing.
Open complete model data22212 E
60×110×28 mm60 mm shaft · spherical-roller support
A roller-bearing reference for evaluating a heavier industrial fan shaft arrangement.
- Dynamic C
- 159 kN
- Static C₀
- 166 kN
- Limiting speed
- 7500 rpm
Before selectionConfirm minimum load, grease quantity, alignment limits and the non-locating support's ability to accommodate expansion.
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 | KOYO6205 | FAG6306 | KOYO1205 | SKF22212 E |
|---|---|---|---|---|
| Bore d (mm) | 25 | 30 | 25 | 60 |
| Outside D (mm) | 52 | 72 | 52 | 110 |
| Recorded width (mm) | 15 | 19 | 15 | 28 |
| Dynamic C (kN) | 17.5 | 30.5 | 15.1 | 159 |
| Static C₀ (kN) | 7.85 | 16.2 | 3.3 | 166 |
| Catalogue limiting speed (rpm) | 13000 | 13700 | 12000 | 7500 |
— = 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
- Measure or calculate rotor, belt and thrust forces at each support over the operating-speed range.
- Check shaft deflection, bearing-seat alignment, balance and critical-speed behavior as a system.
- Select the bearing architecture and define axial location and thermal expansion accommodation.
- Verify life, grease and sealing, then trend vibration and temperature at repeatable operating conditions.
Symptoms worth checking
Vibration dominated by running speed
Check imbalance, looseness, alignment and resonance; do not diagnose race damage from this symptom alone.
Hot bearing after regreasing
Inspect grease quantity, outlet paths and the correct lubricant specification.
Rising axial load as the fan heats
Check whether thermal growth has been trapped by two locating supports.
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 self-aligning bearing fix an unbalanced fan?
No. It can accommodate specified angular misalignment, but rotor imbalance still produces forces and vibration that must be corrected.
Can both fan supports be fixed axially?
Only if the complete design allows the resulting thermal behavior. Many arrangements need one locating support and a controlled expansion path.
Should I choose the highest speed value in the table?
No. The table shows recorded catalogue limiting values, not a ranking for a given fan. Loads, grease, seals, balance and temperature must also be acceptable.
Reference basis & recommendation limits
- SKF — Bearings for Fans
- SKF — Fan bearing arrangements and thermal expansion
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.