Angular Contact Ball Bearings

Angular contact ball bearings are self-retaining bearings consisting of solid outer and inner rings and ball and cage assemblies. Their design, with raceways offset relative to the bearing axis, allows them to absorb simultaneous radial and axial loads and makes them suitable for high rotational speeds.

However, single-row angular contact bearings only absorb axial loads in one direction and must be positioned next to another bearing (normally another angular contact bearing) if the opposing forces are to be absorbed.

Double-row angular contact bearings absorb high radial and axial loads in both directions and correspond in design to paired (O arrangement) single-row angular contact bearings, but with the advantage of a narrower overall width and greater rigidity.

The contact angle (or pressure angle) determines the axial load rating of the bearing. As the contact angle increases, so too does the axial load rating of the angular contact bearing.

Angular contact bearings are available in a large number of versions as single or double-row bearings in open or sealed form, as four-point contact bearings and as spindle bearings for machine tool construction.


  • Angular contact ball bearings up to bore Ø 1500 mm.
  • Versions preferably with sheet steel cage, plastic cage or brass cage.
  • Angular contact ball bearings with ceramic balls or ceramic coating for current insulation can also be manufactured on request.

There is very little scope for adjusting the angle of angular contact ball bearings, so misalignments or shaft deflections can only be compensated to a very small extent. Misalignments lead to stresses on the balls and cage and shorten the service life of angular contact ball bearings. Any skewing of the rings can be heard by increased running noise.

Double-row angular contact ball bearings in the standard version are manufactured with a normal bearing clearance (C0 or CN – no suffix added to the bearing designation). Bearings with a reduced or increased bearing clearance can also be manufactured on request.

  • C2       Radial internal clearance < CN *
  • C3       Radial internal clearance > CN *

* These tolerance classes are added as suffixes to the bearing designation.

Single and double row angular contact ball bearings are manufactured with the normal tolerances (P0) of the radial bearings. P0 is not indicated in the bearing designation.

Bearings can also be manufactured with a greater precision to meet particular requirements.

  • P6       Restricted tolerance *
  • P5       Restricted tolerance *

* These tolerance classes are added as suffixes to the bearing designation.

In the standard version (S0) angular contact ball bearings are heat treated so that they are generally dimensionally stable up to max + 150 °C (in the case of sealed bearings the max. permitted temperature depends on the chosen grease and the material quality of the seals used).

In the case of bearings with plastic cages the permitted operating temperatures must be noted. Special heat treatments are required for higher operating temperature requirements.

  • S1       Operating temperature max. + 200 °C *
  • S2       Operating temperature max. + 250 °C *
  • S3       Operating temperature max. + 300 °C *
  • S4       Operating temperature max. + 350 °C *

* These temperature classes are added as suffixes to the bearing designation.


K         Conical α = 1/12

A         Contact angle of 25°

B         Contact angle of 40°

C         Contact angle of 15°

TN       Cage made of glass fibre reinforced polyamide

2RS     Sealing washers on both sides

ZZ       Cover discs on both sides