Self-aligning roller bearing has two rows of spherical rollers, the outer race is provided with a common concave spherical raceway, while the inner race is provided with two concave spherical raceways that form an angle with the bearing axis. The curvature center of the outer raceway is consistent with the bearing center.

Size Range 
The fundamental dimensions of self-aligning roller bearings are listed in the dimension datasheet, 
Inner diameter range: 30mm~1800mm 
Outer diameter range: 68mm~2180mm 
Width range: 20mm~530 mm .