Designs and variants

SKF supplies needle roller thrust bearings in two designs:
  • needle roller and cage thrust assemblies, AXK series (fig. 1)
  • needle roller thrust bearings with a centring flange, AXW series (fig. 2)
In applications where adjacent components cannot serve as raceways, the assemblies can be combined with bearing washers in different series (→ Bearing washers).
Needle roller and cage thrust assemblies

AXK series assemblies (fig. 1

  • are available for 4 ≤ d ≤ 160 mm
  • can accommodate axial loads in one direction only
  • can be combined with washers in the LS, AS, GS 811 or WS 811 series (→ Bearing washers) in applications where adjacent components cannot serve as raceways
Double direction bearings
  • can accommodate axial loads in both directions
  • can be created by combining two needle 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 hardness and surface finish as bearing washers. SKF does not supply intermediate washers, but provides material specifications and dimensional data on request.

For additional information, refer to Design considerations.

Needle roller thrust bearings with a centring flange

AXW series bearings (fig. 2 and fig. 5

  • are available for 10 ≤ d ≤ 50 mm
  • accommodate axial loads in one direction only
  • consist of a needle roller and cage thrust assembly and a thrust washer with a centring flange

    The flange facilitates mounting and accurately centres the housing washer radially (fig. 6 and fig. 7).

Combined needle roller bearing arrangements

To accommodate combined radial and axial loads, needle roller thrust bearings in the AXW series can be combined with the following radial needle roller bearings:

  • drawn cup needle roller bearings with a closed end or with open ends (fig. 6)
  • needle roller bearings with machined rings (fig. 7)

These arrangements provide a cost-effective and compact solution for combined loads.

Bearing washers

Bearing washers are required in applications where adjacent machine components cannot serve as raceways.

Appropriate washers are listed in the product tables and must be ordered separately, due to the number of possible combinations.

The following series can be combined with needle roller thrust bearings:

LS series universal washers (fig. 8)

  • are made of hardened carbon chromium bearing steel
  • can be used as shaft or housing washers for needle roller thrust bearings in the AXK series
  • can be used as shaft washers for bearings in the AXW series
  • are available for 6 ≤ d ≤ 160 mm
  • raceway surface is ground, while all other surfaces are turned
  • are used for applications where accurate centring of the washers is not necessary or where low speeds are involved
  • washer face opposite the side with the chamfers is the raceway surface and should face the rollers

AS series thin universal washers (fig. 9)

  • are 1 mm thick
  • are made of spring steel and hardened
  • can be used as shaft or housing washers for needle roller thrust bearings in the AXK series
  • can be used as shaft washers for bearings in the AXW series
  • are available for 4 ≤ d ≤ 160 mm
  • can be used to provide a cost-effective bearing solution, if adjacent machine components are not hardened, but have adequate stiffness and the requirements to geometrical tolerances are moderate
    Both faces of the washers are polished and can be used as raceways.

811 series shaft (prefix WS) and housing washers (prefix GS)

  • are used primarily with cylindrical roller and cage thrust assemblies
  • can also be combined with needle roller and cage thrust assemblies
  • can be used in high-speed applications where accurate centring of the bearing washers is required

For additional information about 811 series washers, refer to Cylindrical roller thrust bearings.

Cages

SKF needle roller thrust bearings are fitted with one of the cages shown in table 1. Bearings in the AXW series are fitted exclusively with steel cages.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages and Cage materials.

SKF logo