What is the equivalent of a 30306 bearing?

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

What are the dimensions of a 30306 bearing?

The 30306 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 NSK 30306 with a Timken equivalent?

Yes. NSK and Timken bearings with the same ISO designation are dimensionally interchangeable. The 30306 (30×72×20.75mm) can be replaced with the equivalent Timken 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.

30306

OpenCNTapered Roller BearingVerified matchTapered 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.

30 × 72 × 20.75mm

Open (no seal)

Cr 33.7 kN / C₀r 19 kN

6,000 rpm (grease)

NSKHR30306J30 × 72 × 20.75mm

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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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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
NSK	HR30306J	Open	CN	Verified
Timken	30306	Open	CN	Current
SKF	30306 J2/Q	Open	CN	Verified
NTN	4T-30306	Open	CN	Verified
FAG	30306-XL	Open	CN	Verified

Legacy & Proprietary Numbers

GPZ7306ADAG6319810605SKODA130-5747GPZ7306K

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
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.