Electrically insulated ball bearing
NKE AUSTRIA GmbH

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 ∞.

Range

* 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

Advantages

* 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