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Spherical Roller Bearings

Technical Information

Last Modified: 22nd Apr 2016

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