Cylindrical Roller Thrust Bearings series 811 and 812 are single direction acting separable axial bearings.
Cylindrical roller thrust bearings are insensitive to shock loading and feature much higher load carrying capacity compared to thrust ball bearings. They accommodate very high axial loads but no radial forces. They provide a very rigid bearing assembly for high thrust loading with less space requirement.

Cylindrical roller thrust bearings are of simple design, they consist of a shaft washer (WS), a housing washer (GS), and a cylindrical roller and cage thrust assembly (K), see A below.

With all cylindrical roller thrust bearings, increased sliding friction can occur on the end of the cylindrical rollers.

In order to minimise this negative effect, NKE cylindrical roller thrust bearings with wider sectional widths are produced using several short rollers in each cage pocket instead of using individual longer rollers.

Due to their specific kinematic behaviour, cylindrical roller thrust bearings are only suitable for low speed applications only.

Furthermore, they require minimum axial loads for their optimum function.

With all cylindrical roller thrust bearings, increased sliding friction can occur on the end of the cylindrical rollers.

In order to minimise this negative effect, NKE cylindrical roller thrust bearings with wider sectional widths are produced using several short rollers in each cage pocket instead of using individual longer rollers.

Due to their specific kinematic behaviour, cylindrical roller thrust bearings are only suitable for low speed applications only.

Furthermore, they require minimum axial loads for their optimum function.

NKE cylindrical roller thrust bearings are produced in single direction design only as standard (see b.below).

Double direction acting cylindrical roller thrust bearings are built using a combination of components from single direction acting cylindrical roller thrust bearings together with intermediate washers ZS.
Such intermediate washers are part of NKE supplementary product range and are available on request.
For application designs with space restrictions the cylindrical roller and cage thrust assemblies may be used without washers providing the contact faces of adjacent machine parts are machined as bearing raceways, (e.g. hardened and ground, etc).

The components of cylindrical roller thrust bearings are frequently used either separately or in conjunction with other components in several applications (e.g. to build needle roller thrust assemblies) therefore, they are available as loose parts.

All cylindrical roller thrust bearing types do not allow any misalignment.
The contacting surfaces of both shaft and housing seats must be parallel.
Small NKE cylindrical roller thrust bearings are fitted with shaft - centred polyamide cages as standard.
Polyamide cages are suitable for operating temperatures up to +120 deg C.

Large cylindrical roller thrust bearings are produced with either solid brass cages (suffix PAP), or with solid steel cages,(suffix FP).
NKE cylindrical roller thrust bearings are produced to normal class tolerance (PN) as standard.
For applications of higher accuracy these bearings are produced to precision tolerance class (e.g. P6) on order request.
Detailed values of the tolerance classes available on request.
All cylindrical roller thrust bearings require a certain minimum axial load to ensure a satisfactory operating function.
To prevent excessive sliding friction, the minimum axial load applied should be greater than 5 % of the axial bearing dynamic load rating Ca.
Where such a minimum axial load is not possible the load must be increased by effective measures, (i.e. preloading the bearing) using pressure washers or springs.

Standard plans DIN 616
Cylindrical roller thrust bearings DIN 722

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