Barrel Roller Bearings
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Barrel Roller Bearings
What is a barrel roller bearing?
A barrel roller bearing is a single-row, self-aligning roller bearing with barrel-shaped rollers. Its outer ring has a concave raceway shaped like part of a sphere, so the inner ring, rollers, and cage can tilt within the outer ring. This lets the bearing adjust automatically to misalignment, shaft deflection, and housing distortion, while carrying heavy radial loads.
A standard bearing has four main parts:
- A solid inner ring with two ribs, which fits onto the shaft
- A solid outer ring with a concave raceway, which sits in the housing
- A single row of barrel-shaped rollers
- A cage that keeps the rollers evenly spaced, guided on the inner ring.
The barrel-shaped rollers are what make the bearing self-aligning.
- Their curved profile matches the concave outer raceway, so the rollers keep full contact even when the bearing is tilted.
- The ribs on the inner ring guide the rollers and hold them in place.
The bearing is non-separable, meaning the rings, rollers, and cage stay together as one unit. Rings and rollers are usually made from hardened chrome steel (grade 52100). Cages are most commonly glass fibre reinforced polyamide in smaller sizes and machined brass in larger sizes.
Why are barrel roller bearings essential?
They combine the high radial load capacity of a roller bearing with the self-aligning ability of a spherical bearing, in a narrower and simpler single-row design. Line contact between the rollers and raceways lets them carry very high radial loads, including shock loads, which is why they are widely used in heavy equipment and construction machinery.
They can adjust to misalignment of up to about 4° under normal conditions, so they cope well with shaft deflection, mounting errors, and housings that flex under load. Their main limitation is that they carry only low axial loads. Their boundary dimensions are standardised internationally. So a bearing of a given reference has the same bore, outer diameter, and width, regardless of which reputable manufacturer makes it.
Typical applications include:
- Cable sheaves on mobile cranes
- Lifting frames on wheel loaders
- Pivot joints in construction machinery
- Eccentric shafts in vibrating rollers
- Wheel bearings on mining trucks
- Hose reels and winches
- Conveyors and idlers
- Agricultural machinery
- Gearboxes and slow-running shafts
The main types of barrel roller bearings
- Barrel roller bearings with a cylindrical bore - These are the standard design and the most common. They are pressed directly onto the shaft.
- Barrel roller bearings with a tapered bore (K) - These have a 1:12 tapered bore and are mounted on a tapered shaft seat or on a plain shaft using an adapter sleeve. This makes them easy to fit and remove, and lets them be located anywhere along the shaft.
- 202 series - The lighter series, with a smaller cross section.
- 203 series - The heavier series, with larger rollers and a higher load capacity for the same bore.
- Barrel roller bearings with increased clearance - Available with C3 or C4 clearance, for applications with heavy fits, high temperatures, or tapered bore mounting.
Cage variants include:
- Polyamide cages - Light, quiet, and the standard choice in smaller sizes, but typically limited to around 120°C in continuous use.
- Machined brass cages - Very robust, suited to high temperatures, shock loads, and vibration, and the standard choice in larger sizes.
How to choose the right barrel roller bearing?
- Size and dimensions - The bore must suit the shaft; the outer diameter and width must fit the housing. For the same bore, the 203 series has a larger outer diameter, larger rollers, and higher load capacity than the 202 series, but takes up more space.
- Load - Work out the radial and axial loads and whether they are steady or involve shocks. Compare them with the bearing’s basic dynamic load rating and basic static load rating, which are published in manufacturers’ catalogues. Barrel roller bearings handle heavy radial and shock loads well, but if there is significant axial load, a double-row spherical roller bearing is usually a better choice.
- Misalignment - Barrel roller bearings can adjust by about 4° with a rotating inner ring. The amount is smaller if the outer ring rotates or the inner ring wobbles, so check the manufacturer’s catalogue for these cases.
- Bore type - Choose a cylindrical bore for direct fitting onto a machined shaft, or a tapered bore with an adapter sleeve for plain shafts and easier removal.
- Internal clearance - C3 is greater than normal and is standard for tapered bore bearings and wherever interference fits or temperature differences reduce clearance in operation. C4 is larger still, for higher temperatures or heavier fits.
- Cage - Polyamide cages suit most general applications in smaller sizes. Brass cages are better for high temperatures, heavy shocks, and vibration.
Essential references and specialised ranges
How the numbering works:
The first three digits, 202 or 203. Identifies a barrel roller bearing and its series: 202 is the light series and 203 is the heavier series.
The last two digits indicate the bore:
From 04 upwards, multiply by five (for example, 20204 = 20mm and 20208 = 40mm)
For example, 20211-TVP-C3 is a 202 series barrel roller bearing with a 55mm bore, a polyamide cage, and C3 clearance.
Suffixes:
TVP = glass fibre reinforced polyamide window cage
MB = machined brass cage
K = tapered bore (taper 1:12)
C3 = radial internal clearance greater than normal
C4 = radial internal clearance greater than C3
Suffix codes vary between manufacturers, so check the supplier’s catalogue for the exact meaning.
FAQ - All you need to know about barrel roller bearings
What is the difference between a barrel roller bearing and a spherical roller bearing?
A barrel roller bearing has a single row of barrel-shaped rollers, while a standard spherical roller bearing has two rows. The single row gives a narrower, simpler bearing that carries heavy radial loads and shocks, but only low axial loads. A double-row spherical roller bearing carries higher axial loads in both directions.
How much misalignment can they tolerate?
Under normal operating conditions with a rotating inner ring, a barrel roller bearing can tilt by about 4° from its central position. This is less if the outer ring rotates or the inner ring wobbles.
Can barrel roller bearings take axial loads?
Only light axial loads. They are designed mainly for radial loads. If there is a significant axial load, use a double-row spherical roller bearing or add a separate bearing to take the axial load.
Do barrel roller bearings need lubrication?
Yes, lubrication separates the rollers from the raceways, reduces friction, and protects against corrosion. They are usually grease lubricated, with oil used at higher speeds or temperatures. Most barrel roller bearings are open, so sealing must be provided by the housing.
Click here to learn how to maintain a bearing.
Can I replace a barrel roller bearing myself?
In many cases, yes. Cylindrical bore bearings can be pressed on, or heated with an induction heater so they expand onto the shaft. Tapered bore bearings are fitted on an adapter sleeve and tightened with a locknut, checking that the clearance is reduced by the correct amount. Apply force only to the ring being fitted, and never strike the bearing directly with a hammer.
How do I identify a bearing I need to replace?
The reference is usually marked on the side face of the rings. If the markings are worn away, measure the bore, outer diameter, and width with callipers and match them against a size chart. Also check whether the bore is cylindrical or tapered, and whether the cage is polyamide or brass.
Click here to learn how to measure a bearing.
How can I tell if a bearing is worn or failing?
Warning signs include:
- Grinding, rumbling, or clicking noises
- Increased vibration
- Rough or uneven rotation
- Play in the shaft
- Overheating
- Discoloured or contaminated lubricant
