Information for slewing rings

Slewing rings or slewing bearings offer high loads and tilting moments. These large ball and roller bearings consist of an inner ring and an outer ring, which have bores for fastening options to provide optimal power transmission. The inner and outer rings are usually sealed by environmental seals. In order to withstand high loads, the bearing raceways and rolling elements are designed in such a way that applied forces can be absorbed in all directions.

Slewing rings are designed for slow, steady or oscillating rotary movements. Slewing rings are available as ball or cylindrical roller bearings - the loads applied are decisive for the selection of the type of bearing. They are also available as toothed designs. Slewing rings are sealed, lubricated and relubricated on both sides via grease nipples and are easy to assemble.

We manufacture standard slewing rings and slewing rings according to drawings in various designs with external diameters of 100 - 5000 mm.
Slewing rings are available in different designs. For slewing rings with four-point bearings, a distinction is made between toothless, internally and externally toothed designs. Below you will find our product categories for slewing bearings. We also manufacture on request four-point bearings as a cross roller design.
slewing drive light  slewing drive heavy 
slewing drive light   slewing drive heavy 
slewing drive light  slewing drive heavy
  • High loads and tilting moments
  • Force absorption in all directions
  • High rigidity
  • Low frictional torque
  • Long operating life
  • Surface protection and corrosion resistance
  • Tolerances, tilting play, concentricity and axial runout deviations are determined depending on the requirement
  • Suitable for low and medium rotational speeds. For high speeds are AAR-Bearings suited

The outer and inner rings are made of hardened tempered steel. The ball tracks are thoroughly hardened. Balls or rollers are hardened. The toothing is not hardened as a standard, but can be hardened if the requested requirements are particularly high. You can find precise information regarding the shape and position tolerances from the drawings supplied.
Our slewing rings can be used for a variety of applications. Here you can find some areas of general applications.
  • General mechanical engineering
  • Special machine construction
  • Excavators and mini excavators
  • Drill bits
  • Lathes
  • Conveyor systems
  • Forestry
  • Amusement parks
  • Forklift
  • Crane systems
  • Agriculture
  • Medical technology
  • Radar systems
  • Rail vehicles
  • Solar technology
  • Tunnel boring machines
  • Wind turbines

Here you will find an overview of the proven areas of application of our slewing rings: Our customers
Slewing rings have to withstand high mechanical loads. The slewing ring forms the connections between a rigid body and a movable one. Sufficient dimensioning of the slewing ring is for the design of the construction essential. Therefore it is necessary to name the applied forces in a first step. A main distinction is made between axial and radial forces and the resulting tilting moment. Furthermore, the tooth force, in case of a toothed rotary connection, and the load on the screw connections must also be taken into account in the design.

Axial force FA

Axial forces FA the applied forces are parallel to the axis of rotation.

To calculate the axial forces, an application factor and a safety factor are taken into account for the applied forces. These coefficients depend on the respective application. This results in:
Axial Kraefte

Radial forces FR

Radial forces FR the applied forces are perpendicular to the axis of rotation.
Analog to the axial forces you can calculate the radial forces:
Radial Kraefte

Tilting moment MK

The tilting moment MK results from the eccentric force applied on the slewing ring. The maximum tilting moment, however, is strongly dependent on the type of force introduction and can be taken from a load diagram for the respective slewing ring.


The associated tilting moment Mkeq can be calculated using a safety factor and application factor:

Loads on the screw connection
Our load diagrams are only valid if the strength class of the used screws is at least 10.9 and in compliance with common design rules when choosing the type of screw.