Ball bearing units (Y-bearing units)

Conventional SKF ball bearing units consist of:
  • an insert bearing (Y-bearing) which is based on a single row deep groove ball bearing with a sphered (convex) outside surface and an extended inner ring (fig. 1)
  • a housing, which has a correspondingly sphered but concave bore (fig. 2).
Ball bearing units can accommodate moderate initial misalignment, but normally do not permit axial displacement. The SKF assortment includes units to ISO standards, North American standards, and Japanese Industrial Standards.

They are ready-to-mount, ready-to-use units and available as:

The range

Ball bearing units are available as standard in following designs and variants:

Other variants are possible by ordering the parts separately. Ball bearing units are also available to North American standards and Japanese Industrial Standard (JIS).

Because of their versatility and cost effectiveness, ball bearing units are typically found in the following applications:
  • agricultural machinery
  • construction equipment
  • conveyor systems
  • textile machines and fans
  • machines for food and beverage processing and packaging


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.


SKF logo