SKF 32306 30x72x28.75 - Single-Row Tapered Roller Bearing

SKF 32306 30x72x28.75 - Single-Row Tapered Roller Bearing

SKF 32306 is a single-row tapered roller bearing with dimensions 30x72x28.75 mm, designed to accommodate combined radial and axial loads. Its tapered raceway and roller geometry provides high load-carrying capability and accurate shaft guidance in demanding mechanical systems. Bearings of the 323 series are commonly used in gearboxes, transmission systems, hubs, industrial machinery and other applications requiring reliable support under combined loading.

Technical Specifications - SKF 32306

Manufacturer: SKF
Designation: 32306
Bearing type: Tapered roller bearing
Design: Single row
Rolling elements: Tapered rollers
Bore diameter d: 30 mm
Outside diameter D: 72 mm
Overall width T: 28.75 mm
Inner ring width B: 27 mm
Outer ring width C: 23 mm
Bore type: Cylindrical
Design: Separable
Radial loads: Yes
Axial loads: Yes, in one direction

Dimensions 30x72x28.75 mm

The principal dimensions of SKF 32306 are:

d: 30 mm
D: 72 mm
T: 28.75 mm
B: 27 mm
C: 23 mm

The 28.75 mm dimension is the total bearing width T. It should not be confused with the 27 mm inner ring width or the 23 mm outer ring width.

These dimensions are essential when identifying a replacement bearing for an existing shaft and housing arrangement.

Tapered Roller Bearing Design

SKF 32306 consists of an inner ring assembly with tapered rollers and cage, commonly referred to as the cone, and a separate outer ring, known as the cup.

The raceways and rollers have a tapered geometry. This design allows the bearing to accommodate substantial radial loads while simultaneously supporting axial load.

The separable construction also simplifies installation because the inner ring assembly and outer ring can be mounted separately.

Combined Radial and Axial Loads

A major advantage of a tapered roller bearing is its ability to accommodate combined loads.

A single SKF 32306 can support:

Radial load
Axial load in one direction

When axial forces occur in both directions, two single-row tapered roller bearings can be arranged as an opposed pair.

This configuration is frequently used in gearboxes, transmissions, hubs and other shaft-support systems.

Bearing Clearance and Preload

When tapered roller bearings are installed in pairs, the arrangement can be adjusted to achieve the required operating clearance or preload.

Correct adjustment is important because it influences:

• bearing rigidity
• shaft guidance
• operating temperature
• running accuracy
• bearing service life

Excessive preload can increase friction and temperature, while excessive clearance can reduce the rigidity and accuracy of the bearing arrangement.

Why Use a 32306 Tapered Roller Bearing?

The geometry of the 32306 makes it suitable for applications where a conventional deep groove ball bearing may not provide sufficient combined-load capacity.

The relatively wide tapered roller arrangement provides a large contact area between rollers and raceways. This makes the bearing particularly useful in applications involving significant radial forces combined with axial loading.

Typical Applications

SKF 32306 can be used in appropriately designed:

• industrial gearboxes
• reduction gears
• wheel hubs
• transmission systems
• machine shafts
• agricultural machinery
• material handling equipment
• industrial drive systems

Suitability for a specific machine should always be verified using load, speed, lubrication, temperature and mounting requirements.

SKF 32306 Replacement Identification

When selecting or replacing this bearing, verify:

Brand: SKF
Designation: 32306
Bearing type: Single-row tapered roller bearing
Dimensions: 30x72x28.75 mm
Bore d: 30 mm
Outside diameter D: 72 mm
Overall width T: 28.75 mm
Inner ring width B: 27 mm
Outer ring width C: 23 mm

A bearing should not be selected only by matching the 30 mm bore and 72 mm outside diameter. The complete designation, width and tapered roller bearing geometry must also correspond to the original application.

FAQ - SKF 32306

What are the dimensions of SKF 32306?
The principal dimensions are 30x72x28.75 mm: 30 mm bore, 72 mm outside diameter and 28.75 mm overall width.

What type of bearing is SKF 32306?
It is a single-row tapered roller bearing.

What does 28.75 mm mean in the SKF 32306 dimensions?
It is the overall bearing width T. The inner ring width B is 27 mm and the outer ring width C is 23 mm.

Can SKF 32306 carry axial loads?
Yes. A single-row tapered roller bearing can accommodate axial load in one direction together with radial load.

Can SKF 32306 carry radial loads?
Yes. The tapered roller design is particularly suitable for significant radial loads and combined radial-axial loading.

Is SKF 32306 a separable bearing?
Yes. The inner ring with rollers and cage can be separated from the outer ring.

Why are 32306 bearings often installed in pairs?
An opposed pair can accommodate axial forces acting in both directions and allows the bearing arrangement to be adjusted for the required clearance or preload.

Can any 30x72 mm bearing replace SKF 32306?
No. The bearing type, overall width, internal geometry, load capacity and mounting arrangement must also be compatible.