Self-Aligning Ball Bearings


Self-Aligning Ball Bearings

Self-aligning ball bearings are recommended for applications where aligning the shaft and housing is difficult or where the shaft may bend, such as transmission shafts. The outer ring has a spherical raceway and its center of curvature coincides with that of the bearing, allowing the axis of the inner ring, balls, and cage to rotate freely around the bearing center. Pressed steel cages are typically used for this type.

Since they have a small contact angle, self-aligning ball bearings have low axial load capacity. Permissible dynamic misalignment is approximately 0.07 to 0.12 radian (4 to 7 degrees) under normal loads; however, such angles may not be allowable depending on the surrounding structure.


  • Correct for misalignment
    The inner ring, balls, and cage rotate freely around the bearing center, allowing permissible dynamic misalignment of about 0.07 to 0.12 radian (4 to 7 degrees) under normal loads.
  • Ideal for difficult mountings
    Self-aligning ball bearings suit applications where shaft bending occurs and where it is difficult to align the shaft and housing (transmission shafts, etc.)


  • Gearboxes/speed reducers



answersSelf-aligning ball bearings suit light loads with high-speed rotation, while spherical roller bearings suit heavy loads with low-speed rotation.


answersThe recommended grease for self-aligning ball bearings depends on usage conditions.
You can use the selection criteria for finding suitable grease for deep groove ball bearings with self-aligning ball bearings as well.


answersBecause they have small contact angles, self-aligning ball bearings have extremely limited capacity for thrust loads.
Please consider using thrust bearings with aligning seats if thrust loads are expected.


Industry Applications