Designs and variants

SKF high-capacity cylindrical roller bearings (fig. 1) are available in three different main designs and some variants.
Bearings with an inner ring centred cage
  • are identified by the series designation NCF .. ECJB (fig. 2)
  • are used to locate the shaft axially in one direction and eventually to accommodate axial displacement of the shaft relative to the housing in the opposite direction
  • can be supplied without an outer ring (RN .. ECJB series, fig. 3), where the outer raceway is integrated into the application (→ Raceways on shafts and in housings)
Bearings with an outer ring centred cage
  • are identified by the series designation NJF .. ECJA (fig. 4)
  • for some sizes, contain more rollers than same-sized bearings with inner ring centred cage
  • are used to locate the shaft axially in one direction and eventually to accommodate axial displacement of the shaft relative to the housing in the opposite direction
  • can be supplied without an inner ring (RNU .. ECJA series, fig. 5), where the inner raceway is integrated into the application (→ Raceways on shafts and in housings)
Separable bearings with an inner ring raceway centred cage
  • are identified by the series designation NUH .. ECMH (fig. 6)
  • can accommodate axial displacement of the shaft relative to the housing in both directions
  • can be separated (outer ring with the roller and cage assembly from the inner ring) → simplified mounting and dismounting, particularly where load conditions require both rings to have an interference fit
Double row bearings
Matched bearings
  • are combined so that any difference in cross-section height of the bearings used in a matched set lies within a very small tolerance range
    This tighter tolerance is a precondition for equal load sharing between the bearings.
  • can be supplied as:
    • sets of two bearings (designation suffix DR)
    • sets of three bearings (designation suffix TR)
    • sets of four bearings (designation suffix QR)
Cages

SKF high-capacity cylindrical roller bearings are fitted with one of the cages shown in table 1.

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

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