SKF 32308 40x90x35.25 Tapered Roller Bearing

What Is the SKF 32308 Bearing?

SKF 32308 is a single-row tapered roller bearing with principal dimensions 40x90x35.25 mm. Its tapered raceways and rollers are designed to accommodate combined radial and axial loads. A single-row tapered roller bearing supports axial load predominantly in one direction and is commonly used with a second bearing where axial location in both directions is required.

SKF catalogue data confirms the 32308 dimensions and load ratings.

Technical Specifications

Manufacturer: SKF
Designation: 32308
Bearing type: Tapered roller bearing
Design: Single row
Bore diameter d: 40 mm
Outside diameter D: 90 mm
Total width T: 35.25 mm
Dimensions: 40x90x35.25 mm
Bore type: Cylindrical
Rolling elements: Tapered rollers
Bearing material: Bearing steel
Integral sealing: None
Design: Separable

SKF 32308 Catalogue Performance Data

Basic dynamic load rating C: 143 kN
Basic static load rating C0: 140 kN
Fatigue load limit Pu: 16.0 kN
Reference speed: 6,000 r/min
Limiting speed: 8,000 r/min

These values are listed by SKF for the 32308 size.

Tapered Roller Bearing Design

The SKF 32308 uses tapered rollers operating between tapered inner- and outer-ring raceways.

This geometry enables the bearing to accommodate:

• high radial loads,
• axial loads in one direction,
• combined radial and axial loads,
• demanding industrial operating conditions.

The axial load carrying capability distinguishes tapered roller bearings from cylindrical roller bearings designed primarily for radial loading.

Dimensions 40x90x35.25 mm

The principal dimensions of SKF 32308 are:

d: 40 mm
D: 90 mm
T: 35.25 mm

SKF catalogue tables confirm the 40 mm bore, 90 mm outside diameter and 35.25 mm total width.

High Load Carrying Capacity

The 32308 belongs to a tapered roller bearing series designed for substantial combined loads.

Its catalogue ratings are:

Dynamic C: 143,000 N
Static C0: 140,000 N

The high static and dynamic ratings make the bearing relevant for heavily loaded shafts, transmissions and mechanical drive systems.

Separable Construction

A single-row tapered roller bearing has a separable design.

The inner ring with roller and cage assembly, commonly called the cone, can be mounted separately from the outer ring, commonly called the cup.

This construction facilitates mounting and allows the bearing arrangement to be adjusted according to the required operating conditions.

Radial and Axial Loads

SKF 32308 is designed for combined loading.

Radial loading generates an internal axial force due to the tapered geometry. Bearing arrangement, axial clearance or preload therefore needs to be considered when designing the complete bearing system.

Where axial loads occur in both directions, tapered roller bearings are commonly installed as an appropriately arranged pair.

Typical Applications

SKF 32308 tapered roller bearings can be used in appropriately designed:

• industrial gearboxes,
• transmissions,
• agricultural machinery,
• construction machinery,
• heavy-duty drives,
• wheel and hub arrangements,
• mechanical transmission systems,
• industrial equipment,
• shafts exposed to combined loads.

Actual suitability depends on load, speed, lubrication, temperature, shaft and housing fits and required service life.

How to Select an SKF 32308 Replacement

When selecting a replacement, verify:

Designation: 32308
Dimensions: 40x90x35.25 mm
Bearing type: Single-row tapered roller bearing
Bore: 40 mm
Outside diameter: 90 mm
Total width: 35.25 mm
Load direction: Combined radial and axial
Manufacturer: SKF

For critical applications, the complete designation marked on the original bearing should be checked for any additional SKF suffixes.

FAQ - Technical Questions

What are the dimensions of SKF 32308?
The principal dimensions are 40x90x35.25 mm.

What type of bearing is SKF 32308?
It is a single-row tapered roller bearing.

What is the dynamic load rating of SKF 32308?
The basic dynamic load rating is 143 kN.

What is the static load rating?
The basic static load rating is 140 kN.

What is the reference speed?
SKF lists a reference speed of 6,000 r/min.

What is the limiting speed?
The catalogue limiting speed is 8,000 r/min.

Frequently Asked Questions from Engineers and Maintenance Technicians

Can SKF 32308 carry axial loads?
Yes. Its tapered roller geometry is specifically designed to accommodate radial and axial loads simultaneously.

Can one SKF 32308 carry axial load in both directions?
A single-row tapered roller bearing carries axial load primarily in one direction. Where axial location in both directions is required, an appropriate paired bearing arrangement is normally used.

Is SKF 32308 an open bearing?
Yes. The basic 32308 execution does not incorporate integral seals.

Is SKF 32308 separable?
Yes. The cone assembly and outer ring can be mounted separately.

Can I replace 32308 using dimensions alone?
Not necessarily. In addition to 40x90x35.25 mm, the bearing design, manufacturer suffixes, load requirements, clearance or preload and operating conditions should be verified.