What is the equivalent of a 7309A bearing?

The 7309A is a 45×100×25mm angular contact ball bearing with verified equivalents across multiple brands: NSK 7309A, Timken 7309, FAG 7309-B-TVP, SKF 7309 BEP. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 7309A bearing?

The 7309A bearing has a bore diameter of 45mm, outer diameter of 100mm, and width of 25mm. It has a dynamic load rating of 55 kN, static load rating of 36.8 kN, and weighs 600g. Maximum speed with grease lubrication is 6,600 rpm.

Can I replace a NTN 7309A with a NSK equivalent?

Yes. NTN and NSK bearings with the same ISO designation are dimensionally interchangeable. The 7309A (45×100×25mm) can be replaced with the equivalent NSK part number as long as the seal type (open) and clearance class (CN) match. Always verify load ratings and speed limits for your specific application.

7309A

OpenCNAngular Contact Ball BearingVerified matchAngular Contact Medium Series

Heavier load capacity than 7200. Used in gearboxes, electric motors, and industrial equipment requiring axial load support.

45 × 100 × 25mm

Open (no seal)

Cr 55 kN / C₀r 36.8 kN

6,600 rpm (grease)

NTN7309

Pricing not yet available for this part.

Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	45 mm
Outer diameter (D)	100 mm
Width (B)	25 mm
Dynamic load rating (C)	55 kN
Static load rating (C₀)	36.8 kN
Weight	600 g
Max speed (grease)	6,600 rpm
Max speed (oil)	8,900 rpm

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Why This Match Is Correct

✓Exact dimensional match (bore, OD, width)

✓Load ratings within tolerance

✓Seal type verified via manufacturer tables

✓Speed rating compatible

Cross-References

Every way this part is identified across brands and catalogs.

Tier-1 Brand Equivalents

Brand	Part Number	Seal	Clearance	Status
NTN	7309	Open	CN	Verified
NSK	7309A	Open	CN	Current
Timken	7309	Open	CN	Verified
FAG	7309-B-TVP	Open	CN	Verified
SKF	7309 BEP	Open	CN	Verified

Legacy & Proprietary Numbers

SKF7309BNSK7309BKOYO7309BMRC7309PRHP7309BETNFLT7309BND30309NTN7309BSNR7309BSKF7309BEAGMNSK7309BEAT85SUCNBKOYO7309B-5GC3FYMRC7309PDURHP7309BETNUSKF7309BECAPNSK7309BGKOYO7309BGMRC7309PJSKF7309BECBJNSK7309BWSKF7309BECBMNSK7309BWGSKF7309BECBPSKF7309BECBYSKF7309BECCMSKF7309BEGAPSKF7309BEGAYSKF7309BEGBYSKF7309BEGCYSKF7309BEP

Show all 31 cross-references

SKF7309BEY

Technical Details & Applications

Specification variations and common equipment types.

Internal Clearance

Normal Clearance (CN)

Standard radial internal clearance. Suitable for most applications under normal operating conditions.

TemperatureUp to ~70°C operating temperature

Seal Type

Open (No Seal)

No seals or shields. Allows external lubrication and cooling. Lowest friction, highest speed capability.

Avoid forDirty, dusty, or wet environments. Applications without planned lubrication maintenance.

Examples

Machine tool spindles
Gearboxes with oil bath lubrication
High-speed precision equipment

Where This Bearing Is Used

Electric motorsPumps and compressorsConveyor rollersAgricultural machineryFans and blowersGearboxesPower transmission equipmentWashing machinesPrinting pressesHVACAutomotive alternators and A/C compressors

Alternative Parts

Options if this exact part isn't what you need.

Same Geometry, Different Configuration

SKF Part Number	Seal Type	Clearance
7309 BEP	Open (No Seal)	CN
7309 BEP C3	Open (No Seal)	C3
7309 BE-2RZP	2RS	CN
7309 BE-2RZP C3	2RS	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.