Self-Aligning Ball Bearings

Self-aligning bearings accommodate misalignment better than any other bearing and
runs smoothly, even where oscillation occurs. High-speed performance and an unparalleled
speed range are produced as a result of having the lowest start up and
operational friction of any rotary bearing. Due to the low friction and reduced
maintenance requirements, republication intervals are lengthened, which 
keeps the bearing running efficiently.

Double row self-aligning bearings have a sphere raceway in the outer ring 
and a double raceway in the inner ring. This feature gives the bearings their 
self-aligning property, permitting angular misalignment of the shaft relative 
to the housing. They are therefore particularly suitable for applications where misalignment can arise from errors in mounting or from shaft deflection. 
Double row self-aligning bearings are mainly used to carry radial loads and 
light axial loads, but can't carry pure axial loads.