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Bearing types and designs

SKF’s comprehensive assortment of super-precision bearings is designed for machine tool spindles and other applications that require a high level of running accuracy at high to extremely high speeds. Each bearing type incorporates unique features to make it suitable for specific operating conditions. For details about the different bearing types, refer to the relevant product section.
Angular contact ball bearings
  • high-capacity (D design) (fig. 1)
  • high-speed (E design) (fig. 2)
  • high-speed (B design) (fig. 3)
  • all designs in different variants:
    • for single mounting or matched bearing sets
    • for universal matching or universally matchable sets
    • bearings with steel balls or hybrid bearings
    • open or with seals (fig. 3)
  • high-speed (W design) hybrid bearings with seals, for universal matching or matched bearing sets

For additional information, refer to Angular contact ball bearings.

Cylindrical roller bearings
  • single row (N design)
    • basic design (fig. 4)
    • high-speed designs (fig. 5)
    • hybrid bearings
  • double row (NN design) (fig. 6)
    • bearings with steel rollers
    • hybrid bearings
  • double row (NNU design) (fig. 7)

For additional information, refer to Cylindrical roller bearings.

Double direction angular contact thrust ball bearings
  • basic design (BTW series) (fig. 8)
    • bearings with steel balls
    • hybrid bearings
  • high-speed design (BTM series) (fig. 9)
    • bearings with steel balls
    • hybrid bearings

For additional information, refer to Double direction angular contact thrust ball bearings.

Axial-radial cylindrical roller bearings
  • basic design (NRT series) (fig. 10)

For additional information, refer to Axial-radial cylindrical roller bearings.

Angular contact thrust ball bearings for screw drives
  • single direction (BSA and BSD series) (fig. 11), universally matchable bearings for mounting as sets (fig. 12)
  • double direction with seals (BEAS series) (fig. 14)
    • for bolt mounting (BEAM series) (fig. 15)
  • cartridge units with a flanged housing (FBSA series) (fig. 16)

For additional information, refer to Angular contact thrust ball bearings for screw drives.

Cages
The super-precision bearings shown in this catalogue all contain a cage. For some special applications, however, bearings without a cage (full complement) may be offered. The primary purposes of a cage are to:
  • Separate the rolling elements to reduce the frictional moment and frictional heat in the bearing.
  • Keep the rolling elements evenly spaced to optimize load distribution and enable quiet and uniform operation.
  • Guide the rolling elements in the unloaded zone, to improve the rolling conditions and to help avoid damaging sliding movements.
  • Retain the rolling elements of separable bearings when one bearing ring is removed during mounting or dismounting.
Cages are mechanically stressed by frictional, strain and inertial forces. They can also be degraded by high temperatures and chemicals like certain lubricants, lubricant additives or by-products of their ageing, organic solvents or coolants. Therefore, both the design and material of a cage have a significant influence on the suitability of a rolling bearing for a particular application. As a result, SKF has developed a variety of cages, made of different materials, for different bearing types and operating conditions.

In each product section, information about standard cages and possible alternatives is provided. Standard cages are those considered most suitable for the majority of applications. If a bearing with a non-standard cage is required, check availability prior to ordering.

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