How to Choose Spherical Roller Bearings for Conveyors and Heavy-Duty Equipment

Choose a spherical roller bearing when an application requires a bearing that can carry heavy radial loads while accommodating a specified amount of shaft misalignment or deflection. Before ordering, confirm the axial load, operating speed, shaft and housing dimensions, internal clearance, mounting method, lubrication, and contamination exposure.

Spherical roller bearings are used in demanding industrial equipment, including conveyors, crushers, screens, and other heavy machinery. Their self-aligning design can help where the shaft and housing do not remain perfectly aligned during operation. However, self-alignment does not make a bearing immune to poor installation, inadequate lubrication, or excessive misalignment.

This guide explains what buyers should check when selecting spherical roller bearings for replacement, OEM, or bulk purchasing. You can review product options in the Nexans Bearing product catalog before submitting an inquiry.

What Is a Spherical Roller Bearing?

A spherical roller bearing typically has two rows of rollers running on a common spherical outer-ring raceway. This design allows the bearing to accommodate angular misalignment within limits specified for the particular bearing and operating conditions.

Spherical roller bearings primarily carry radial loads and can also carry axial loads in both directions within their design limits. The allowable loads, speed, and misalignment vary by bearing model and arrangement.

Buyer takeaway: A spherical roller bearing is not simply a replacement for any bearing exposed to heavy loads. It must match the shaft arrangement, available space, load direction, and operating environment.

Quick Selection Checklist

If the equipment manufacturer specifies a bearing designation or mounting procedure, use it as the primary reference.

1. Start With the Actual Load and Duty Cycle

Heavy-duty equipment does not experience one uniform type of load. A conveyor pulley bearing, a crusher bearing, and a vibrating screen bearing may face very different operating conditions.

Before comparing bearing models, identify:

• the expected radial load;

• any axial load and its direction;

• shock or impact loads;

• continuous or intermittent operation;

• starts and stops; and

• changes in load during normal use.

These details help determine whether a proposed bearing has suitable capacity. They also influence the choice of housing, fits, lubrication, and maintenance schedule.

Do not select a bearing solely because it has a higher catalog load rating than the old one. The mounting arrangement and operating conditions must also be suitable.

2. Assess Misalignment—But Do Not Use It to Hide a Machine Problem

One reason to consider a spherical roller bearing is its ability to accommodate angular misalignment. Misalignment can result from shaft deflection under load or small differences between the shaft and housing alignment.

That capability has limits. The amount permitted depends on the specific bearing, load, speed, and surrounding components, including seals.

Investigate the equipment if you observe:

• severe or changing shaft deflection;

• damaged housing seats;

• loose mounting components;

• repeated seal damage; or

• unusually rapid bearing wear.

A self-aligning bearing can accommodate suitable operating misalignment, but it cannot repair a damaged shaft, an incorrectly machined housing, or a mounting arrangement that exceeds its limits.

3. Confirm the Complete Designation and Bore Type

The full bearing designation may contain information needed for correct purchasing. Record all letters and numbers from the equipment specification or existing bearing rather than quoting only the basic series and size.

In particular, confirm whether the bearing has a:

• cylindrical bore, mounted directly on a suitable shaft seat; or

• tapered bore, mounted using the arrangement specified for the equipment, such as an adapter sleeve, withdrawal sleeve, or tapered shaft seat.

These designs are not interchangeable without reviewing the shaft and housing arrangement. Suffix conventions can also vary by manufacturer, so verify what each designation means for the proposed product.

If the old marking is damaged, send a drawing, clear photos, and equipment details to support identification.

4. Select Internal Clearance for the Mounted Bearing

Internal clearance is an important specification for spherical roller bearings. The clearance available after mounting can differ from the clearance measured before installation.

For example, mounting a tapered-bore bearing can reduce radial internal clearance as the bearing is driven onto its seating surface. Fits, temperature differences, and operating conditions can change the effective working clearance further.

Buyers should not automatically specify increased clearance for every conveyor or heavy-duty application. An unsuitable clearance selection may contribute to heat, vibration, or reduced service life.

When requesting a recommendation, provide:

• the full bearing designation;

• bore and mounting arrangement;

• shaft and housing details;

• operating temperature;

• speed; and

• the equipment manufacturer’s clearance requirement, if available.

For tapered-bore installation, follow the approved mounting procedure and measurement method. The correct drive-up or clearance reduction is specific to the bearing and arrangement.

5. Review Shaft, Housing, and Bearing Arrangement

A bearing’s performance depends on how it is supported in the machine. Confirm whether the bearing position is intended to locate the shaft axially or allow movement to accommodate thermal expansion.

Other mounting questions include:

• Is the shaft seat in good condition?

• Are the housing dimensions correct?

• Does the housing provide the required support?

• Are locating rings, sleeves, or other mounting components specified?

• Can the bearing be installed and removed without damaging it?

In conveyors and long-shaft equipment, thermal expansion and shaft location should be reviewed as part of the complete bearing arrangement. Do not assume that choosing a self-aligning bearing automatically solves axial expansion or fit problems.

If a replacement bearing repeatedly fails at the same position, inspect the shaft, housing, mounting components, and alignment before placing another order.

6. Match Lubrication to Speed, Load, and Maintenance Access

Spherical roller bearings may use grease or oil lubrication depending on the machine design. The correct method must provide lubricant to the rolling contacts under the actual load, speed, and temperature conditions.

Ask:

1. Does the equipment use grease or oil?

2. Is relubrication possible while the machine is in service?

3. What operating temperature is expected?

4. Is the bearing location easy to inspect?

5. Has the machine experienced lubricant loss or contamination?

Under-lubrication, unsuitable lubricant, and poor relubrication practices can all shorten bearing life. Excess lubricant can also create problems in some arrangements. Follow the equipment manufacturer’s guidance and verify lubricant compatibility when changing products.

7. Consider Dust, Water, and the Complete Sealing System

Conveyors, mining equipment, and other heavy-duty machines often operate around abrasive dust, water, or process material. Bearing selection therefore needs to include the housing and sealing arrangement, not just the bearing itself.

Confirm:

• the type and condition of external seals;

• whether the housing is suitable for the environment;

• how contamination is prevented during relubrication;

• whether washdown or water ingress occurs; and

• the inspection and maintenance interval.

A new bearing installed behind a damaged seal may fail quickly, even if its load rating and dimensions are correct. If contamination is a recurring issue, review the complete assembly rather than repeatedly changing only the bearing.

Application Notes: Conveyors, Crushers, and Vibrating Equipment

Conveyor equipment

Confirm the bearing’s position, pulley or shaft load, operating hours, housing arrangement, and exposure to dust or moisture. Long conveyors may also require careful consideration of shaft location and thermal expansion.

Crushers and other impact-loaded machinery

Describe shock loads, vibration, contamination, and maintenance access. A high nominal load rating alone does not establish suitability for repeated impact or an incorrectly supported housing.

Vibrating equipment

Vibrating screens and related machinery can impose application-specific demands on bearings, fits, clearance, and lubrication. Follow the equipment manufacturer’s bearing specification and verify whether a proposed product is approved for that duty. Do not substitute a general-purpose bearing based on dimensions alone.

Common Sourcing Mistakes to Avoid

Buyers can reduce replacement and bulk-order risk by avoiding these mistakes:

• Ordering by basic dimensions while ignoring the full designation.

• Confusing cylindrical-bore and tapered-bore versions.

• Selecting clearance without considering how the bearing is mounted.

• Assuming self-alignment compensates for any amount of misalignment.

• Overlooking a damaged housing seat or shaft.

• Replacing the bearing without repairing a failed external seal.

• Ignoring the locating and non-locating positions in a shaft arrangement.

• Substituting a bearing in vibrating equipment without checking the machine specification.

A complete application description is often more useful than a part number alone.

What Should Buyers Send for a Product Review or Quote?

To request a spherical roller bearing for an industrial project, send:

• the complete bearing designation or OEM reference;

• equipment type and bearing position;

• a drawing or clear photos, if available;

• shaft and housing dimensions;

• bore type and any sleeve or mounting components;

• load, speed, temperature, and duty cycle;

• dust, water, or vibration exposure;

• lubrication and sealing details;

• required quantity; and

• packaging and delivery requirements.

If some operating information is unavailable, identify what is unknown. This helps separate a straightforward replacement quote from a selection request that needs further technical verification.

Review the bearing products at Nexans Bearing to prepare your inquiry.

FAQ: Spherical Roller Bearing Selection

What is the main advantage of a spherical roller bearing?

Its design combines radial load-carrying capability with the ability to accommodate angular misalignment within specified limits. The appropriate model still depends on the application’s load, speed, mounting, and lubrication requirements.

Can spherical roller bearings carry axial load?

Yes, they can carry axial loads in both directions within the limits of the selected design and operating conditions. Confirm the requirements against the specific bearing model.

Should I always choose increased internal clearance?

No. Clearance should be selected for the bearing’s mounting method and working conditions. A tapered-bore bearing, for example, loses some radial internal clearance during mounting.

Are cylindrical-bore and tapered-bore bearings interchangeable?

Not without reviewing the shaft and mounting arrangement. They require different seating and installation considerations, even when other basic dimensions appear similar.

Can a spherical roller bearing fix shaft misalignment?

It can accommodate a specified amount of angular misalignment. It cannot correct damaged bearing seats, excessive shaft deflection, or an incorrectly designed assembly.

Why does a replacement bearing keep failing in a conveyor?

Possible causes include contamination, inadequate lubrication, unsuitable fits, damaged housing seats, excessive load, or incorrect mounting. The complete assembly should be inspected before assuming the bearing specification is the only problem.

What information should I provide for a bulk quotation?

Send the full designation, quantity, application, destination, and any drawing or OEM reference. Include mounting, lubrication, environmental, and packaging requirements when they affect the requested product.

Where can I review available bearing products?

Visit the Nexans Bearing product catalog. For a selection inquiry, include your equipment details so the proposed product can be checked against the application.

Final Thoughts

A spherical roller bearing can be a strong candidate for heavy-duty equipment where radial load, axial load, and operating misalignment must be considered together. Successful selection also depends on internal clearance, mounting, shaft location, lubrication, and protection from contamination.

Begin with the equipment specification, confirm the complete bearing designation, and inspect the surrounding assembly before approving a replacement. Browse the Nexans Bearing product catalog, then send your bearing reference, drawing, application details, and quantity through the Nexans Bearing website for product and quotation review.