Insulating the bearings with silicon-nitride ceramic eliminates the need for additional electrical insulation at the end covers and provides a minimum 1,000Vac or Vdc breakdown voltage. For smaller bearings, silicon-nitride rolling elements can be used. The bearings are available with 80 to 400-mm outerring diameters.

NKE Austria GmbH, 20 Barney Rd., Box 5255, Clifton Park, NY 12065, (518) 371 5759, nke.at

Electrically Insulated Bearings