What is the equivalent of a 30306-J2-Q-C3 bearing?

The 30306-J2-Q-C3 is a 30×72×20.75mm tapered roller bearing with verified equivalents across multiple brands: NSK HR30306J C3, NTN 4T-30306 C3, SKF 30306 J2/Q C3, Timken 30306 C3. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 30306-J2-Q-C3 bearing?

The 30306-J2-Q-C3 bearing has a bore diameter of 30mm, outer diameter of 72mm, and width of 20.75mm. It has a dynamic load rating of 33.7 kN, static load rating of 19 kN, and weighs 256g. Maximum speed with grease lubrication is 6,000 rpm.

Can I replace a FAG 30306-J2-Q-C3 with a NSK equivalent?

Yes. FAG and NSK bearings with the same ISO designation are dimensionally interchangeable. The 30306-J2-Q-C3 (30×72×20.75mm) 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.

30306-J2-Q-C3

OpenC3Tapered Roller BearingTapered Roller — Medium, Narrow

Medium series tapered roller bearings with higher load capacity than 302xx for the same bore size. Used where heavier loads demand a more robust bearing cross-section.

FAG30306-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)	30 mm
Outer diameter (D)	72 mm
Width (B)	20.75 mm
Dynamic load rating (C)	33.7 kN
Static load rating (C₀)	19 kN
Weight	256 g
Max speed (grease)	6,000 rpm
Max speed (oil)	7,800 rpm

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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	30306-XL C3	Open	C3	Probable
NSK	HR30306J C3	Open	C3	Probable
NTN	4T-30306 C3	Open	C3	Probable
SKF	30306 J2/Q C3	Open	C3	Probable
Timken	30306 C3	Open	C3	Probable

Legacy & Proprietary Numbers

GPZ7306ADAG6319810605FLT30306KOYO30306MGM30306NSK30306NTN30306SKODA130-5747STEYR30306TIMKEN30306ZKL30306GPZ7306K

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
30306 J2/Q	Open (No Seal)	CN
30306 J2/Q C3	Open (No Seal)	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.