Insulation Bearing

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

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

Typical applications

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