What is the equivalent of a NU309W bearing?

The NU309W is a 45×100×25mm cylindrical roller bearing with verified equivalents across multiple brands: NSK NU309W, NTN NU309ET2, SKF NU 309 ECP, Timken NU309EM. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a NU309W bearing?

The NU309W bearing has a bore diameter of 45mm, outer diameter of 100mm, and width of 25mm. It has a dynamic load rating of 74 kN, static load rating of 71 kN, and weighs 856g. Maximum speed with grease lubrication is 5,300 rpm.

Can I replace a FAG NU309W with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The NU309W (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.

NU309W

OpenCNCylindrical Roller BearingVerified matchCylindrical Roller — Medium Series (NU)

Medium cross-section cylindrical roller bearings (NU-type) with higher load capacity than NU200 for the same bore size. Free axial float in both directions. Used where heavier radial loads require a more robust bearing.

45 × 100 × 25mm

Open (no seal)

Cr 74 kN / C₀r 71 kN

5,300 rpm (grease)

FAGNU309-E-TVP2

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)	74 kN
Static load rating (C₀)	71 kN
Weight	856 g
Max speed (grease)	5,300 rpm
Max speed (oil)	7,000 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
FAG	NU309-E-TVP2	Open	CN	Verified
NSK	NU309W	Open	CN	Current
NTN	NU309ET2	Open	CN	Verified
SKF	NU 309 ECP	Open	CN	Verified
Timken	NU309EM	Open	CN	Verified

Legacy & Proprietary Numbers

SKFNU309NTNNU309STEYRNU309E/M6/C3KOYONU309NSKNU309SNRNU309ZKLNU309SKFNU309ECJNTNNU309ESTEYRNU309E/TGP1/C3SKFNU309ECJ/C3SKFNU309ECMSKFNU309ECMASKFNU309ECMA/C3SKFNU309ECM/C3

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
NU 309 ECP	Open (No Seal)	CN
NU 309 ECP/C3	Open (No Seal)	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.