What is the equivalent of a NJ-304-ECP bearing?

The NJ-304-ECP is a 20×52×15mm ball bearing with verified equivalents across multiple brands: NSK NJ304W, NTN NJ304ET2, SKF NJ 304 ECP, Timken NJ304EM. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a NJ-304-ECP bearing?

The NJ-304-ECP bearing has a bore diameter of 20mm, outer diameter of 52mm, and width of 15mm. It has a dynamic load rating of 31.5 kN, static load rating of 26.9 kN, and weighs 176g. Maximum speed with grease lubrication is 11,000 rpm.

Can I replace a FAG NJ-304-ECP with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The NJ-304-ECP (20×52×15mm) 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.

NJ-304-ECP

OpenCNCylindrical Roller BearingVerified match

20 × 52 × 15mm

Open (no seal)

Cr 31.5 kN / C₀r 26.9 kN

11,000 rpm (grease)

FAGNJ304-E-TVP220 × 52 × 15mm

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Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	20 mm
Outer diameter (D)	52 mm
Width (B)	15 mm
Dynamic load rating (C)	31.5 kN
Static load rating (C₀)	26.9 kN
Weight	176 g
Max speed (grease)	11,000 rpm
Max speed (oil)	15,000 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	NJ304-E-TVP2	Open	CN	Verified
NSK	NJ304W	Open	CN	Verified
NTN	NJ304ET2	Open	CN	Verified
SKF	NJ 304 ECP	Open	CN	Verified
Timken	NJ304EM	Open	CN	Verified

Legacy & Proprietary Numbers

SKFNJ304STEYRNJ304KOYONJ304NSKNJ304ETNTNNJ304RHPNJ304JSNRNJ304ZKLNJ304SKFNJ304ECJ/C3STEYRNJ304E/TGP1SKFNJ304ECPSTEYRNJ304E/TGP1/C3SKFNJ304ECP/C3SKFNJ304ECP/C4

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
NJ 304 ECP	Open (No Seal)	CN
NJ 304 ECP/C3	Open (No Seal)	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.