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NKE electrically insulated rolling bearings.

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

NKE electrically insulated rolling bearings reliably prevent current discharge. Three versions are available:

Bearings with oxide ceramic insulating layers on outer ring (SQ77) or inner ring (SQ77E) – Applied with plasma technology, the insulation has a guaranteed dielectric strength of at least 1000 V AC or DC.
SQ77B (hybrid bearing): Rolling bearing with oxide ceramic rolling elements. Resistance of insulation theoretically


SQ77 (insulated outer ring) Cylinderical 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) as well as SQ77B (hybrid) 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

Electric motors, generators, etc.

Download production information, PDF, 1MB

Should you require further information pertaining to any of these products contact us on tel. 021 4524661

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TEL: +353 (0)21 4524661. Fax: +353 (0)21 4524662. Email:


31 A, Euro Business Park, Little Island Co. Cork. Ireland.