The speed at which an insert bearing or a ball bearing unit can operate depends mainly on:
  • the method used to lock it onto the shaft (→ Locking methods)
  • the sealing solution
For insert bearing that are locked onto the shaft with grub screws or an eccentric locking collar, the permissible speed of the bearing is determined by its fit on the shaft. The looser the fit, the lower the speed (table 1).
If an insert bearing is mounted with SKF ConCentra locking, on an adapter sleeve, or with an interference fit (bearings in the 17262..-2RS1 and 17263..-2RS1 series), the permissible speed is much higher than if another locking method is used. Their concentric fit also provides a low vibration level and quiet running (→ Permissible speed).
Because of the relubrication requirements in applications with relatively high speeds, SKF recommends using ball bearing units that can be relubricated (→ Lubrication).


If ball bearing units are to be used in an application where health, safety, or the environment is at risk, the SKF application engineering service has to be contacted during the design phase.

This is also true for applications with relatively high speeds and where machine downtime can cause significant problems.

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