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Designs and variants

Cylindrical roller thrust bearings are very stiff and require little axial space. They are separable, that means that shaft washer, housing washer, and cylindrical roller and cage thrust assembly can be mounted separately.
Cylindrical roller thrust bearings are manufactured with one or two rows of rollers (fig. 1 and fig. 2). Bearings in the 811 and 812 series are mainly used in applications where thrust ball bearings do not have sufficient load carrying capacity.
Single direction cylindrical roller thrust bearings

As standard, cylindrical roller thrust bearings are available as single direction bearings (fig. 1 and fig. 2) and can accommodate axial loads in one direction only.

Double direction cylindrical roller thrust bearings

Double direction cylindrical roller thrust bearings can accommodate axial loads in both directions. They can be created by combining two cylindrical roller and cage thrust assemblies and two bearing washers with an intermediate washer. Depending on the design, an intermediate washer can be shaft or housing centred (fig. 3 and fig. 4).

Intermediate washers must have the same surface finish and hardness as bearing washers. SKF does not supply intermediate washers, but provides material specifications and dimensional data on request.

For additional information, refer to Design of bearing arrangements.

Components

SKF can supply the components of cylindrical roller thrust bearings (fig. 5, fig. 6 and fig. 7) separately. The components are listed in the product tables and include:

  • cylindrical roller and cage thrust assemblies (prefix K)
  • shaft washers (prefix WS)
  • housing washers (prefix GS)
Single components might be required for applications where:
  • The faces of adjacent machine components can serve as raceways and bearing arrangements with a low axial section height are required.
  • Other combinations of cylindrical roller and cage thrust assemblies and washers are required, for example with two shaft or housing washers.

Bearing washers

SKF supplies bearing washers in different designs and series. Bearing washers are required in cases where adjacent machine components cannot serve as raceways. Appropriate washers are listed in the product tables.

Shaft washers (prefix WS) and housing washers (prefix GS) are made of hardened carbon chromium bearing steel. The raceway surfaces are precision ground. Shaft washers have a ground bore while housing washers have a ground outside surface. Therefore, SKF recommends using these washers in high-speed 11 applications where accurate centring of the bearing washers is required.

LS series universal washers can be used as both shaft or housing washers for bearings in the 811 series. These washers are used for applications where accurate centring of the bearing washers is not necessary or where low speeds are involved.

For additional information about LS series washers, refer to Needle roller thrust bearings.
Cages

Depending on their series and size, SKF cylindrical roller thrust bearings are fitted with one of the cages shown in table 1.

The lubricants generally used for rolling bearings do not have a detrimental effect on cage properties. However, some synthetic oils and greases with a synthetic oil base and lubricants containing EP additives, when used at high temperatures, can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages and Cage materials.

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