What is the equivalent of a 4T-30308-C3 bearing?

The 4T-30308-C3 is a 40×90×25.25mm ball bearing with verified equivalents across multiple brands: NSK HR30308J C3, NTN 4T-30308 C3, SKF 30308 J2/Q C3, Timken 30308 C3. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 4T-30308-C3 bearing?

The 4T-30308-C3 bearing has a bore diameter of 40mm, outer diameter of 90mm, and width of 25.25mm. It has a dynamic load rating of 49.2 kN, static load rating of 29.1 kN, and weighs 484g. Maximum speed with grease lubrication is 4,800 rpm.

Can I replace a FAG 4T-30308-C3 with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The 4T-30308-C3 (40×90×25.25mm) 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.

4T-30308-C3

OpenC3Tapered Roller BearingVerified match

40 × 90 × 25.25mm

Open (no seal)

Cr 49.2 kN / C₀r 29.1 kN

4,800 rpm (grease)

FAG30308-XL C3

Pricing not yet available for this part.

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)	25.25 mm
Dynamic load rating (C)	49.2 kN
Static load rating (C₀)	29.1 kN
Weight	484 g
Max speed (grease)	4,800 rpm
Max speed (oil)	6,000 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	30308-XL C3	Open	C3	Verified
NSK	HR30308J C3	Open	C3	Verified
NTN	4T-30308 C3	Open	C3	Verified
SKF	30308 J2/Q C3	Open	C3	Verified
Timken	30308 C3	Open	C3	Verified

Legacy & Proprietary Numbers

FLT30308GPZ7308KOYO30308MGM30308NSK30308NTN30308STEYR30308TIMKEN30308ZKL30308

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

Alternative Parts

Options if this exact part isn't what you need.

Same Geometry, Different Configuration

SKF Part Number	Seal Type	Clearance
30308 J2/Q	Open (No Seal)	CN
30308 J2/Q C3	Open (No Seal)	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.