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TF Series Bearings were designed for outstanding toughness under harsh conditions.  They combine longer service life and superior resistance against wear, seizure & heat (also in contaminated lubrication).

Condition Description

  • Contamination
  • High Load
  • High Temperature
  • Lubrication


  • Material Handling
  • Power Generation
  • Power Transmission
  • Quarrying, Mining and Construction
  • Steel and Metals
  • Wind Energy

Product Features

  • Special material
  • Innovative heat treatment technology
  • Outperforming standard bearing steel
  • TF, NTF, HTF STF, WTF – material to meet the most challenging environments.
  • TF series materials can be applied to a wide range of bearings:

    - Cylindrical & taper roller bearings

    - Spherical roller bearings

    - Deep-groove ball bearings

    - Angular contact ball bearings


  • Up to 10x's service life with contaminated lubrication
  • Up to twice the service life under clean lubrication
  • Up to 4x's the service life at 160°C
  • Less than one-third the rate of wear
  • 40% improvement in seizure resistance
STF 509 kV 6551gS3
Show Description
509Bearing Bore
kVBearing Type
6551gS3Basic Number