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Basic design bearings

Depending on their series and size, standard SKF spherical roller bearings are manufactured to one of following basic designs:
  • CC design bearings have two stamped window-type steel cages, an inner ring without flanges and a floating guide ring centred on the inner ring. The CC design is indicated by the designation suffix C or CC. Large CC design bearings with the designation suffix EC or ECC have an optimized internal design for increased load carrying capacity (fig. 1)
  • CA design bearings have a machined double prong-type brass cage, an inner ring with a retaining flange on both sides and a floating guide ring centred on the inner ring. The flanges on the inner ring are designed to keep the rollers in place when swivelling the bearing during mounting or maintenance. The flanges are not designed to guide the rollers or accommodate any axial load. The CA design is indicated by the designation suffix CA. Large CA design bearings with the designation suffix ECA have an optimized internal design for increased load carrying capacity (fig. 2).
  • E design bearings have two stamped window-type steel cages, an inner ring without flanges and a floating guide ring centred on the inner ring (d ≤ 65 mm) or on the cages (d > 65 mm). They have an annular groove and three lubrication holes in the outer ring. E design bearings are indicated by the designation suffix E. All E design bearings have an optimized internal design for increased load carrying capacity (fig. 3).

Annular groove and lubrication holes

SKF spherical roller basic design bearings are available with an annular groove and three lubrication holes in the outer ring (designation suffix W33) or three lubrication holes in the outer ring (designation suffix W20) (fig. 4). 

  • SKF E design bearings (fig. 3) have an annular groove and three lubrication holes as standard. This feature is not identified in the bearing designation (no designation suffix).
  • Sealed spherical roller bearings are equipped with an annular groove and three lubrication holes in the outer ring, except those with the designation suffix W.

Cages

Cages in SKF spherical roller bearings are an integral part of the bearing internal design. Depending on their internal design, series and size, SKF spherical roller bearings are fitted with one of the cages shown in (fig. 1, fig. 2 and fig. 3). For additional information about the suitability of cages, refer to Cages and Cage materials.
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