Spherical Roller Bearings

Technical Information

Spherical Roller Bearings

Spherical roller bearings are inherently self-aligning and very robust. The two rows of rollers make the bearings able to carry heavy loads. Invented by SKF and refined over the years, the present SKF range of spherical roller bearings includes a wide range of sizes of several ISO Dimension Series and also includes special designs, for example, for vibrating screens and similar applications. More recently a range of sealed spherical roller bearings has been added to the assortment. Split spherical roller bearings are usually based on the standard bearings but can be customized as required.

Spherical roller bearings have two rows of rollers with a common sphered raceway in the outer ring and two inner ring raceways inclined at an angle to the bearing axis.

This gives them an attractive combination of design features making them irreplaceable in many demanding applications. They are self-aligning and consequently insensitive to misalignment of the shaft relative to the housing and to shaft deflection or bending.

SKF spherical roller bearings are leading in design and can, in addition to high radial loads, accommodate high axial loads acting in both directions.

The standard range of SKF spherical roller bearings comprises of

open bearings
sealed bearings
bearings for vibratory applications

Supplementary Designations

C2	Radial internal clearance smaller than Normal
C3	Radial internal clearance greater than Normal
C4	Radial internal clearance greater than C3
C5	Radial internal clearance greater than C4
C08	Heightened running accuracy to ISO tolerance class 5
C083	C08 + C3
C084	C08 + C4
2CS	Sheet steel reinforced contact seal of acrylonitrile-butadiene rubber (NBR) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring covered with a polymer band. Lubricated with an extreme pressure bearing grease according to the table
2CS2	Sheet steel reinforced contact seal of fluoro rubber (FKM) on both sides of the bearing. Annular groove and three lubrication holes in the outer ring; covered with a polymer band. Lubricated with a polyurea high-temperature grease
2CS5	Sheet steel reinforced contact seal of hydrogenated acrylonitrile-butadiene rubber (HNBR) on both sides of the bearing. Otherwise as 2CS2
HA3	Case-hardened inner ring
K	Tapered bore, taper 1:12
K30	Tapered bore, taper 1:30
P5	Dimensional and running accuracy to ISO tolerance class 5
P6	Dimensional and running accuracy to ISO tolerance class 6
P62	P6 + C2
VA405	Bearings for vibratory applications with surface hardened cages
VA406	VA405 and PTFE-coated bore
VE552(E)	Outer ring with three equally spaced threaded holes in one side face to accommodate hoisting tackle; the E indicates that appropriate eye bolts are supplied with the bearings
VE553(E)	As VE552 but with threaded holes in both side faces
VG114	Surface hardened pressed steel cage
VQ424	Running accuracy better than C08
W	Without annular groove and lubrication holes in outer ring
W20	Three lubrication holes in outer ring
W26	Six lubrication holes in inner ring
W33	Annular groove and three lubrication holes in outer ring
W64	Solid Oil filling
W77	Plugged W33 lubrication holes
W513	W26 + W33
235220	Case-hardened inner ring with helical groove in bore

The design of the inner ring and/or cages:

C(J), CC
Two window-type steel cages, flangeless inner ring and guide ring centred on the inner ring

EC(J), ECC(J)
Two window-type steel cages, flangeless inner ring, guide ring centred on the inner ring and reinforced roller complement

CA
One-piece machined brass cage, double-pronged, retaining flanges on the inner ring and guide ring centred on the inner ring

CAF
As CA, but with a steel cage.

ECA, ECAC
Reinforced roller complement, one-piece machined brass cage, double-pronged, retaining flanges on the inner ring, guide ring centred on the inner ring

ECAF
As ECA, but with a steel cage

E
For bearings with a bore diameter d ≤ 65 mm:
Two pressed window-type steel cages, flangeless inner ring and guide ring centred on the inner ring

For bearings with a bore diameter d > 65 mm:
Two pressed window-type steel cages, flangeless inner ring and guide ring centred on the cages

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Last Modified: 22nd Apr 2016