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Ball bearing units (Y-bearing units)

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).

fig. 1

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:

SKF ConCentra ball bearing units

Ball bearing plummer block units

SKF Food line Ball bearing units (flanged housing)

Ball bearing flanged units

Ball bearing take-up unit with a grey cast iron housing

Ball bearing take-up units

The range


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

Ball bearing plummer block units (fig. 3)

with cast iron housings – table 1

with composite housings – table 2

with pressed steel housings (housings to be ordered separately from the bearings) – table 3

with composite housings for the SKF Food Line – table 4

with stainless steel housings – table 5

Ball bearing flanged units (fig. 4)

with cast iron housings – table 6, table 7 and table 8

with composite housings – table 9 and table 10

with pressed steel housings (housings to be ordered separately from the bearings) – table 11 and table 12

with composite housings for the SKF Food Line – table 13, table 14 and table 15

with stainless steel housings – table 16 and table 17

Ball bearing take-up units (fig. 5 , fig. 6)

with cast iron housings – table 18

with composite housings for the SKF Food Line – table 19

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

fig. 3

fig. 4

fig. 5

fig. 6

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 Food Line ball bearing units

SKF ball bearing units with composite housings

SKF ball bearings for agricultural applications

SKF ConCentra ball bearings