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B&V Rolling Bearings
B&V Rolling Bearings

Electrically insulated rolling bearings reliably prevent current discharge. 

We 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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