What is the equivalent of a NJ308 bearing?

The NJ308 is a 40×90×23mm cylindrical roller bearing with verified equivalents across multiple brands: NSK NJ308W, NTN NJ308ET2, SKF NJ 308 ECP, Timken NJ308EM. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a NJ308 bearing?

The NJ308 bearing has a bore diameter of 40mm, outer diameter of 90mm, and width of 23mm. It has a dynamic load rating of 58.5 kN, static load rating of 57 kN, and weighs 650g. Maximum speed with grease lubrication is 6,000 rpm.

Can I replace a FAG NJ308 with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The NJ308 (40×90×23mm) 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.

NJ308

OpenCNCylindrical Roller BearingCylindrical Roller — Medium Series (NJ)

Medium cross-section cylindrical roller bearings (NJ-type) with one-direction axial restraint. Higher load capacity than NJ200 series. Same dimensions as NU300 but with semi-locating capability.

40 × 90 × 23mm

Open (no seal)

Cr 58.5 kN / C₀r 57 kN

6,000 rpm (grease)

FAGNJ308-E-TVP240 × 90 × 23mm

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Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	40 mm
Outer diameter (D)	90 mm
Width (B)	23 mm
Dynamic load rating (C)	58.5 kN
Static load rating (C₀)	57 kN
Weight	650 g
Max speed (grease)	6,000 rpm
Max speed (oil)	—

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Cross-References

Every way this part is identified across brands and catalogs.

Tier-1 Brand Equivalents

Brand	Part Number	Seal	Clearance	Status
FAG	NJ308-E-TVP2	Open	CN	Probable
NSK	NJ308W	Open	CN	Probable
NTN	NJ308ET2	Open	CN	Probable
SKF	NJ 308 ECP	Open	CN	Probable
Timken	NJ308EM	Open	CN	Probable

Legacy & Proprietary Numbers

SKFNJ308NTNNJ308STEYRNJ308CITR620036ENASA620414KOYONJ308NSKNJ308SNRNJ308ZKLNJ308SKFNJ308EC/B910NTNNJ308ESTEYRNJ308E/TGP1/C4SKFNJ308ECJSKFNJ308ECJ/C3SKFNJ308ECMSKFNJ308ECMA

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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