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Cages

Bearings in the BTW series are fitted as standard with the following cages:

  • d ≤ 130 mm
    two glass fibre reinforced PA66 cages, snap-type, ball centred, designation suffix TN9
  • d ≥ 140 mm
    two machined brass cages, snap-type, ball centred, designation suffix M

Bearings in the BTM series are fitted as standard with the following cages:

  • d ≤ 130 mm
    two glass fibre reinforced PA66 cages, window-type, ball centred, designation suffix TN9
  • d ≥ 140 mm
    two machined brass cages, window-type, ball centred, designation suffix M

The cages enable the preloaded bearings to run reliably at high speeds and to withstand rapid starts and stops as well as alternating loads. They also provide good grease retention.

For information about the suitability of cages, refer to Cage materials

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