Self-aligning roller bearings have inner ring with two rows of raceway,outer ring are spherical raceway,inner circle are swelled bearing and the center of the outer ring orbital plane and the bearing center are consistent.So it has self-aligning ability,even when there are set errors or axis deflection between bearings and bearing box ,it can be used when the inner and the outer ring are tilted. Self-aligning roller bearing has higher quality to take radial loads,bidirectional axial loads and composed loads.It can be used to take shake and impact loads. The design for stamping cage type CC,typeCA,typeMB,typeE1AM for the brass holder.