Bearing Elements

Rectangular profile/profiled raceway


Bearing Type

  • 4 race rings with profiled raceways
  • Plastic ball cage with retained balls


  • Maximum possible integration capacity
  • Series application to meet cost constraints
  • Greatest possible flexibility of preload, runability and diameter ranges 


Diameter range

  • infinitely variable from 70 to 2000 mm

In detail

Bearing type

Franke bearing elements in type LER are designed for medium rotational speeds and accuracies. They run smoothly, possess high dynamism and require just compact mounting space. The straight contact surface ensures simple integration in the mating structure and also a high rigidity. The attractive price makes this bearing element type LER an economic solution.


Bearing elements of the LER type consist of two inner and two outer raceways, along with a plastic cage with retained balls. The race rings are divided at one point to compensate for the temperature expansion factor. They possess compensatory properties for demanding forms of stress. LER are generally mounted free from clearance. The preload can be defined individually to meet the specific requirement. See 'Technical information' for the adjustment methods.

Mating structure

The bearing element mounted determines the overall con- struction's load bearing capacity. Hence the mating con- struction can be made of alternative materials such as steel, aluminium or plastic. Axial and radial accuracy (see diagram below) are defined to a substantial extent by the mating components. These properties can be enhanced by boosting the accuracy of manufacture.

Constructive example

Technical details


Material Race rings: 54SiCr6, rolling elements: 100Cr6, cage: PA12/TPU
Temperature in use –30 °C to +80 °C, briefly up to +100 °C
Circumferential speed max. 5 m/s, without seals max. 10 m/s
Lubricant grease Klüber Isoflex Topas NCA52
Lubricant schedule see "Technical Information" 
Tolerance details see "Technical Information"