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Designs and variants

The most popular designs of SKF backing bearings are based on double or three-row cylindrical roller bearings (fig. 1). In addition, backing bearings based on single row needle roller bearings and double row tapered roller bearings are available.
Cylindrical roller backing bearings

SKF cylindrical roller backing bearings are available in several designs and variants. The major differences between the bearings are:

  • the number of roller rows (two or three)
  • bearing design with cage(s) or full complement of roller sets
  • the outer ring configuration
    • with/without integral flange(s)
  • the inner ring configuration
    • with/without integral flange(s)
    • with/without flange ring(s)
    • with/without guide ring(s)
    • bore with/without annular groove(s) and lubrication hole(s)
    • bore with/without lubrication hole(s)
  • open or sealed design
    • NBR, HNBR or FKM contact seal on both sides
    • Fey-ring seal on both sides
    • gap-type seal on both sides

Details about the actual designs and variants are available in the product table.

Axial guidance

Backing bearings with integral flanges or flange rings on both the inner and outer rings can take some axial load and can provide axial guidance. Other backing bearings require thrust washers between the outer ring side faces and the support saddles (fig. 2).


Seals made of FKM (fluoro rubber) exposed to an open flame or temperatures above 300 °C (570 °F) are a health and environmental hazard! They remain dangerous even after they have cooled.

Read and follow the safety precautions under this WARNING.

Other backing bearings

SKF can also supply single row needle roller and double row tapered roller backing bearings on request.

Needle roller backing bearings

  • are based on full complement (no cage) needle roller bearings (fig. 3)
  • incorporate an outer ring without a flange
  • incorporate an inner ring with two integral flanges and lubrication holes
  • are the smallest within the SKF assortment, providing a low cross-sectional height

Tapered roller backing bearings

  • are based on double row tapered roller bearings, TDO design (back-to-back arrangement, fig. 4)
  • are sealed on both sides with a stamped sheet steel washer
  • have lubrication grooves in the small side faces of the inner rings
  • accommodate axial and heavy radial loads

SKF backing bearings, if not a full complement of rollers, are fitted with one, two or three of the cages described below.

For information about the suitability of cages, refer to Cages.

Cylindrical roller backing bearings

  • are fitted with machined metal cages, double prong-type and/or prong-type, ring or roller centred (fig. 5, fig. 6)

Tapered roller backing bearings

  • are fitted with two stamped steel cages, window-type, roller centred (fig. 7)
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