A self-aligning ball bearing has two rows of balls with common spherical raceways in the outer ring. This function endows them with the properties of self-alignment and helps them to perform perfectly, even with a minor shaft misalignment relative to the housing. They are especially useful for applications where errors in mounting or shaft deflection can result in misalignment. Such bearings are manufactured with or without a seal. The tapered bore and adapter sleeve are also available.

Self-aligning ball bearings create less friction than other bearing types, allowing them to operate at higher speeds without building up too much heat. As a result, for low- to medium-sized loads, self-aligning ball bearings are more fitting.

Self Aligning Ball Bearings are available in various designs including: open, sealed, tapered bore c/w adapter sleeve and also an extended inner ring version with special bore tolerances for applications employing commercial ground shafting.