What is the equivalent of a 3221-05 bearing?

The 3221-05 is a 30×72×19mm ball bearing with verified equivalents across multiple brands: NSK 7306A, Timken 7306, FAG 7306-B-TVP, SKF 7306 BEP. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 3221-05 bearing?

The 3221-05 bearing has a bore diameter of 30mm, outer diameter of 72mm, and width of 19mm. It has a dynamic load rating of 31 kN, static load rating of 19.3 kN, and weighs 331g. Maximum speed with grease lubrication is 9,600 rpm.

Can I replace a NTN 3221-05 with a NSK equivalent?

Yes. NTN and NSK bearings with the same ISO designation are dimensionally interchangeable. The 3221-05 (30×72×19mm) 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.

3221-05

OpenCNAngular Contact Ball BearingVerified match

30 × 72 × 19mm

Open (no seal)

Cr 31 kN / C₀r 19.3 kN

9,600 rpm (grease)

NTN7306

Pricing not yet available for this part.

Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	30 mm
Outer diameter (D)	72 mm
Width (B)	19 mm
Dynamic load rating (C)	31 kN
Static load rating (C₀)	19.3 kN
Weight	331 g
Max speed (grease)	9,600 rpm
Max speed (oil)	—

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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	7306	Open	CN	Probable
NSK	7306A	Open	CN	Verified
Timken	7306	Open	CN	Verified
FAG	7306-B-TVP	Open	CN	Probable
SKF	7306 BEP	Open	CN	Verified

Legacy & Proprietary Numbers

SKF7306BRHP7306BETNNSK7306BKOYO7306BPEUG3221-05STEYR7306BEG/MP1FLT7306BND30306NTN7306BSNR7306BSKF7306BECAPRHP7306BETNSULP5NSK7306BWKOYO7306BGPEUG322105STEYR7306BEGVA/MP1SKF7306BECBMRHP7306BETNUNSK7306BWGSKF7306BECBPRHP7306BMBSKF7306BECBYRHP7306BMBUSKF7306BEGAMSKF7306BEGAPSKF7306BEGAYSKF7306BEGBMSKF7306BEGBPSKF7306BEGBYSKF7306BEN1GBP

Show all 34 cross-references

SKF7306BEPSKF7306BEYSKF7306BGSKF7306BGM/B20

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

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