NKE electrically insulated rolling bearings - Optimum protection against bearing damage caused by the passage of currents

Written by: NKE Austria GmbH | Published:

NKE electrically insulated rolling bearings reliably prevent current discharge.

NKE provides bearings with oxide ceramic insulating layers on the bearing ring. Applied with plasma technology, the insulation has a guaranteed breakdown resistance of at least 1000V AC or DC.

Two variants are available:

SQ77: Insulation on the outer ring
SQ77E: Insulation on the inner ring

Product range

SQ77 (insulated outer ring)
Cylindrical roller bearings - Design variants: NJ, NU, NUP; Dimension series: 210-230, 310-330; Cages: brass and polyamide; Radial clearance groups: C0, C3, C4
Deep groove ball bearings - Dimension series: 6212-6226; 6312-6326; Cages: brass; Radial clearance groups: C3, C4
Other types and SQ77E (insulated inner ring) upon request


Higher operational reliability through optimum protection against electrical corrosion
More economic than, for example, insulation on housings or shafts
Interchangeable: Same key dimensions and technical properties as conventional bearings
Coating resistant to damage if correctly handled

Typical applications

Traction motors of railway vehicles
Electric motors (AC/DC)
Generators (e.g. in wind turbine generators)

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