Pillow block bearing  is actually deep groove ball bearing a variant, the characteristic is its outer diameter for spherical surface, can match into the bearing corresponding concave spherical inside a self-aligning role.

Although its basic performance and deep groove ball bearing should be similar, but because of this bearing is mostly used in rough mechanical, installation location is not enough precise, shaft and seat hole to neutral axis of the poor, or axial length and deflection under the condition of large, etc, and bearing itself accuracy is not tall enough, some structure is rough, so performance of the actual performance is the same specifications of deep groove ball bearings to a considerable discount.

The pillow block bearing  priority is applicable to request equipment and parts simple situations, such as used in agricultural machinery, transportation system or on construction machinery.