RAS Bearings
Spherical Roller Bearings
What is a Spherical Roller Bearing?
A RAS spherical bearing is a bearing that permits angular rotation about a central point in two orthogonal directions (usually within a specified angular limit based on the bearing geometry). Typically these bearings support a rotating shaft in the [bore] of the inner ring that must move not only rotationally, but also at an angle.
Often referred as SRBs, these bearings are recognized for their ability to handle very high radial loads along with moderate axial loads while accommodating shaft misalignment. Their construction features a barrel-shaped outer ring raceway, two rows of barrel-shaped rollers, and an inner ring with dual raceways. This unique geometry ensures excellent load distribution, minimizes stress, and provides outstanding durability even in demanding conditions.
Understanding Spherical Bearings and Their Uses
Spherical bearings are used in a wide range of applications where rotational motion must adapt to changes in the alignment of its axis. A simple example is the drive axle of a vehicle suspension, where the axle must move up and down while also allowing the wheels to steer. Although spherical bearings are not directly used in this position, similar principles apply and they are often found in sub-components such as constant-velocity joints.
These bearings can be of hydrostatic or mechanical construction. A spherical bearing consists of an outer ring, an inner ring and a locking feature that keeps the inner ring captive within the outer ring in the axial direction. The mating surfaces are spherical (or toroidal), forming the raceway. They slide against each other with either lubrication, a maintenance-free PTFE liner, or incorporate rolling elements such as ball bearings to reduce friction.
Because of their versatility, spherical bearings are widely used in car suspensions, engines, driveshafts, heavy machinery, sewing machines and many other applications.
How the self-alignment works:
Each spherical bearing has two rows of barrel-shaped rollers, a common sphered outer ring raceway and two inner ring raceways set at an angle to the bearing axis. The centre of the sphere in the outer ring lies on the bearing axis, allowing the bearing to self-align and compensate for shaft deflection or mounting misalignment.
This unique design makes spherical bearings indispensable in steel plants, cement mills, mining machinery, paper industries, wind energy and heavy industrial drives across India.
Spherical Bearing Product Specifications Table
| Range: (d)10 mm to 400 mm {In Straight and Taper Bore (K)} | |||
|---|---|---|---|
| 21304 | to | 21320 | CCW33 |
| 22205 | to | 22260 | CCW33/MBW33 |
| 22205 | to | 22230 | EW33 |
| 22307 | to | 22340 | CCW33/MBW33 |
| 22308 | to | 22320 | EW33 |
| 23020 | to | 23060 | CCW33/MBW33 |
| 23120 | to | 23160 | CCW33/MBW33 |
| 23215 | to | 23256 | CCW33/MBW33 |
| 24024 | to | 24056 | MBW33 |
| 24120 | to | 24156 | MBW33 |
| 23936 | to | 23980 | MBW33 |
bearings
Technology
Types of Spherical Roller Bearings
Spherical Roller Thrust Bearings
Thrust spherical bearings are designed for extremely heavy axial loads with some radial capacity. With symmetrical barrel rollers, they compensate for misalignment and deliver high stability in vertical shafts, turbines, and gearboxes.
Key Features and Benefits of Spherical Bearings
High Load Capacity
Barrel-shaped rollers distribute load evenly, ideal for heavy machinery.
Handles Misalignment
The spherical raceway design compensates for shaft deflection and misalignment.
Durable in Harsh Environments
Performs reliably under dust, vibration, shock and impact.
Low Friction & Smooth Running
Optimised roller profiles form effective lubrication films.
Extended Service Life
Special roller geometry reduces stress and heat, extending bearing life.
Easy Mounting & Interchangeability
Standard IATF dimensions allow easy replacement.
Applications of Spherical Bearings
Steel & Rolling Mills
Mill stands, continuous casters, presses
Cement Plants
Crushers, rotary kilns, clinker coolers
Mining & Quarrying
Vibrating screens, conveyors, crushers
Power Generation
Hydro turbines, alternators, vertical shafts
Paper & Pulp Mills
Dryers, calendars, refiners
Railways & Locomotives
Traction motors, bogies
Construction & Heavy Machinery
Cranes, excavators, loaders
Wind Energy
Main shafts, yaw systems
Marine & Offshore
Winches, propeller shafts, deck machinery
Bulk Handling & Ports
Stacker reclaimers, ship loaders
Automotive & Light Machinery
Found in car suspensions, driveshafts, engines and sewing machine subcomponents for reliable angular and rotational motion.
Design & Selection Basics
- Loads: Confirm radial + axial loads before choosing series.
- Speed & Temperature: Verify limiting speed and lubrication requirements.
- Bore Type: Straight for standard fits, tapered for adapter/withdrawal sleeves.
- Mounting: Heat mounting recommended; check clearance with feeler gauge.
- Designation System: Example – 22212 E/C3 = Series + Bore + Design + Clearance.
Why Choose RAS Bearings?
Trusted Supplier Across India
We proudly serve industries such as steel, cement, mining, power and railways, delivering reliable bearings for both OEMs and maintenance teams. Our India supply network ensures fast and consistent availability.
Proven Expertise
With years of experience and a deep understanding of Indian industrial conditions, our experts recommend solutions that maximise performance, service life and cost-efficiency, even in demanding applications.
Technical Support & Training
From bearing selection and sizing to installation guidance, maintenance tips and failure analysis, our technical team supports you every step of the way. We also provide on-site and remote training to improve reliability.
Reliable Sourcing
We supply only 100% genuine products, including Schaeffler bearings and other global brands. Each bearing comes with GST invoicing, batch traceability and certification, giving you complete confidence in quality.
Quality Systems & Traceability
All RAS products are sourced and supplied under IATF-aligned quality processes. Our strict quality checks and traceability ensure consistent performance and compliance with global standards.
Custom Solutions
Every industry has unique needs. That’s why we provide special clearances, sealed spherical designs, split spherical bearings and tailored solutions engineered for your specific operating conditions.
Looking for the right spherical roller bearing for your application?
Contact RAS Bearings & Industrial Components – Our experts will guide you with the best solution for your industry.
FAQs on Spherical Roller Bearings
Why is it called a spherical roller bearing?
These bearings get their name from the spherical-shaped outer ring raceway. This special geometry allows the rollers to self-align, so the bearing can tolerate misalignment and shaft deflection without losing performance.
How is a spherical roller bearing different from a spherical ball bearing?
Spherical ball bearing: Uses balls, handles lighter loads, mainly radial.
Spherical roller bearing: Uses barrel-shaped rollers, supports much heavier radial and axial loads and compensates for misalignment.
Can a spherical roller bearing take axial load?
Yes. Unlike many other roller bearings, spherical roller bearings handle both radial and axial loads. This makes them suitable for demanding applications where combined loads are present.
How much misalignment can a spherical bearing handle?
Depending on the series and size, spherical roller bearings can tolerate angular misalignment of a few degrees caused by shaft bending or mounting errors, while still maintaining performance.
How do I check clearance in a spherical roller bearing?
Use a feeler gauge or dial indicator between inner and outer rings while rotating by hand. Compare readings with manufacturer clearance standards to ensure proper fit.