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
Compressor architecture
Identify the compressor type, rotor support locations and radial/axial loads over pressure and speed changes.
Chemical exposure
Record the actual lubricant, refrigerant or gas, temperature and cage/seal compatibility requirements.
Rotor positioning
Determine the required axial stiffness, hot clearance and thrust direction without relying on basic bearing size.
Which bearing structures make sense?
Cylindrical roller radial support
Consider where the rotor layout separates radial support from thrust location.
Check first: Validate exact internal design, cage and minimum load; a general NU record is only a starting point.
Angular-contact thrust arrangement
Consider where an engineered pair or set controls axial position.
Check first: Matching, preload and the axial-load envelope require compressor-specific validation.
Deep-groove motor support
Relevant to a separately supported external drive motor when suitable.
Check first: Do not transfer a motor-bearing recommendation to a process-exposed rotor position.
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.
NU 206 ECJ
30×62×16 mm30 mm shaft · radial architecture reference
Illustrates a separate radial-support option with internal axial freedom.
- Dynamic C
- 44 kN
- Static C₀
- 36.5 kN
- Limiting speed
- 14000 rpm
Before selectionNot a compressor approval: validate rotor loads, cage, oil compatibility, clearances and the exact required variant.
Open complete model data7206 ACCBM
30×62×16 mm30 mm shaft · axial-location candidate
An angular-contact record for investigating a designed combined-load bearing set.
- Dynamic C
- 27.5 kN
- Static C₀
- 17.3 kN
- Limiting speed
- 22000 rpm
Before selectionConfirm axial load, matched arrangement and lubricant/gas compatibility; do not treat one bearing as bidirectional thrust support.
Open complete model data7306B
30×72×19 mm30 mm shaft · larger angular-contact envelope
Offers another actual envelope for a load and stiffness study, not a replacement by bore alone.
- Dynamic C
- 36.6 kN
- Static C₀
- 19 kN
- Limiting speed
- 6900 rpm
Before selectionCheck housing dimensions, pairing and material compatibility with the compressor manufacturer.
Open complete model data6206
30×62×16 mmExternal drive motor only · radial baseline
A reference for an independently assessed external motor bearing position.
- Dynamic C
- 20.3 kN
- Static C₀
- 11.2 kN
- Limiting speed
- 15000 rpm
Before selectionThis recommendation does not cover a refrigerant-exposed or oil-flooded compressor rotor.
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 | SKFNU 206 ECJ | SKF7206 ACCBM | KOYO7306B | SKF6206 |
|---|---|---|---|---|
| Bore d (mm) | 30 | 30 | 30 | 30 |
| Outside D (mm) | 62 | 62 | 72 | 62 |
| Recorded width (mm) | 16 | 16 | 19 | 16 |
| Dynamic C (kN) | 44 | 27.5 | 36.6 | 20.3 |
| Static C₀ (kN) | 36.5 | 17.3 | 19 | 11.2 |
| Catalogue limiting speed (rpm) | 14000 | 22000 | 6900 | 15000 |
— = 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 every bearing position and separate process-exposed rotor bearings from external drive-motor bearings.
- Obtain the pressure/speed duty cycle, support reactions, thrust direction and required rotor clearance.
- Verify the exact bearing design with lubrication, material compatibility, life and operating-preload checks.
- Retain the specified matched sets and assembly process; verify rotor clearance and temperatures during controlled commissioning.
Symptoms worth checking
Axial-position change or rotor contact
Stop and investigate thrust support, preload, retention and thermal clearance using the equipment procedure.
Cage or lubricant deterioration
Review lubricant/refrigerant compatibility, contamination and operating temperature.
Noise after substituting a basic-size bearing
Compare full internal-design and cage suffixes, pairing and clearance with the original specification.
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
Can a standard angular-contact bearing replace a compressor-specific one?
Not without validation of the exact internal design, axial limits, cage, material compatibility and set arrangement. Shared dimensions are insufficient.
Are these bearings suitable for every refrigerant?
No. These are catalogue starting points; chemical compatibility and lubrication behavior must be verified for the actual fluid and operating conditions.
Why is a motor bearing included?
Many compressors have a separate drive motor. Its support is a distinct application and must not be confused with process-exposed compressor bearings.
Reference basis & recommendation limits
- SKF — Creating the right environment for compressor bearings
- NSK — Bearings for Pumps & Compressors
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.