Rolling mills impose heavy, shock-loaded, hot and dusty duty, making bearing capacity and reliability critical. This article reviews selection essentials: generous load margins (typically limiting equivalent dynamic load to about 15% of the basic dynamic load rating), C3/C4 clearance groups to accommodate thermal growth, and the self-aligning spherical raceway that compensates roll deflection and housing deformation to avoid edge stress. Lubrication with oil-air or grease systems, condition monitoring by vibration spectra and temperature trends, and planned replacement windows complete a reliability strategy for mill bearings.