30306D

OpenCNTapered 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.

NSKHR30306J30 × 72 × 20.75mm
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$29.19
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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
Weight256 g
Max speed (grease)6,000 rpm
Max speed (oil)7,800 rpm

Equivalents Across Brands

BrandPart NumberSealClearanceStatus
NSKHR30306JOpenCNProbable
Timken30306OpenCNProbable
SKF30306 J2/QOpenCNProbable
NTN4T-30306OpenCNProbable
FAG30306-XLOpenCNProbable

Internal Clearance

Normal Clearance (CN)

Standard radial internal clearance. Suitable for most applications under normal operating conditions.

Best forGeneral-purpose use. Normal temperatures, standard fits, moderate speeds.
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.

Best forClean environments with external lubrication systems. High-speed applications where heat dissipation matters.
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

Heavy-duty wheel hubs (trucks, trailers)Industrial gearboxesCrane and hoist equipmentMining conveyorsPaper mill equipmentLarge pumps and compressorsRolling mill equipmentGeneral-purpose electric motors (1-10 HP)Pumps and compressorsAutomotive alternators and A/C compressorsConveyor rollersAgricultural machineryWashing machinesIndustrial fansPrinting presses
TruckingMiningPaper & pulpHeavy industry

Other Variants Available

Same bearing geometry — different seal and clearance configurations.

SKF Part NumberSeal TypeClearance
30306 J2/QOpen (No Seal)CN
30306 J2/Q C3Open (No Seal)C3