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NSK’s WTF (Water-Tough) Bearings were developed using advanced technologies including ultrahigh clean-material technology and NSK’s proprietary heat-treatment technology.

Condition Description

  • Contamination
  • High Load


  • Steel and Metals

Product Features

  • Steel material technology
  • Special NSK heat-treatment technology
  • Optimum chemical component design technology
  • Available for four-row cylindrical and four-row taper roller bearings


  • Bearing life 3x's longer than conventional bearing.
  • Relatively free from non-metallic inclusions on raceway surface in hibiting generation of cracks
  • Grain boundaries have been strengthened to help prevent the spread of cracks
  • Prevent further spread of corrosion fatigue cracks due to water infiltration


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