What is the equivalent of a NJ-307-ECP-C3 bearing?

The NJ-307-ECP-C3 is a 35×80×21mm ball bearing with verified equivalents across multiple brands: NSK NJ307W C3, NTN NJ307ET2 C3, SKF NJ 307 ECP/C3, Timken NJ307EM/C3. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a NJ-307-ECP-C3 bearing?

The NJ-307-ECP-C3 bearing has a bore diameter of 35mm, outer diameter of 80mm, and width of 21mm. It has a dynamic load rating of 49.5 kN, static load rating of 47 kN, and weighs 460g. Maximum speed with grease lubrication is 6,700 rpm.

Can I replace a FAG NJ-307-ECP-C3 with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The NJ-307-ECP-C3 (35×80×21mm) can be replaced with the equivalent NSK part number as long as the seal type (open) and clearance class (C3) match. Always verify load ratings and speed limits for your specific application.

NJ-307-ECP-C3

OpenC3Cylindrical Roller BearingVerified match

35 × 80 × 21mm

Open (no seal)

Cr 49.5 kN / C₀r 47 kN

6,700 rpm (grease)

FAGNJ307-E-TVP2-C3

Pricing not yet available for this part.

Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	35 mm
Outer diameter (D)	80 mm
Width (B)	21 mm
Dynamic load rating (C)	49.5 kN
Static load rating (C₀)	47 kN
Weight	460 g
Max speed (grease)	6,700 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
FAG	NJ307-E-TVP2-C3	Open	C3	Probable
NSK	NJ307W C3	Open	C3	Probable
NTN	NJ307ET2 C3	Open	C3	Probable
SKF	NJ 307 ECP/C3	Open	C3	Probable
Timken	NJ307EM/C3	Open	C3	Probable

Legacy & Proprietary Numbers

SKFNJ307NSKNJ307NTNNJ307KOYONJ307RHPNJ307EJSNRNJ307STEYRNJ307ZIL120-1701066ZKLNJ307SKFNJ307ECJNSKNJ307EMNTNNJ307ESKFNJ307ECMNSKNJ307ETSKFNJ307ECPSKFNJ307ECP/C3

Technical Details & Applications

Specification variations and common equipment types.

Internal Clearance

Greater Than Normal (C3)

Increased radial internal clearance. Required when bearings operate at elevated temperatures or with tight shaft fits.

Temperature70-150°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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