NSK’s TF Series Bearings have been designed for outstanding toughness under harsh conditions.  They combine longer service life & 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 and Mining
  • Steel and Metals
  • Wind Energy

Product Features

  • Special material.
  • Innovative heat treatment technology.
  • Outperforming standard bearing steel.
  • TF, NTF, HTF STF, WTF – material to cater to all your 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 10 times service life with contaminated lubrication.
  • Up to twice the service life under clean lubrication.
  • Up to 4 times 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

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