These bearings are combination of radial ball bearing, seal and housing of high-grade cast iron which conies in various shapes. The OD of the bearing and the internal surface of housing are spherical, because of this the unit is self-aligning. The radial load carrying capacity of this bearing is higher than that of the corresponding self-aligning ball bearing used for standard plummer blocks. Any misalignment of axis that arises from poor workmanship on the shaft or error in fitting will be properly adjusted.