Power-transmission drives—gearboxes, motors, pumps, and compressors—load bearings with high torque, combined radial/axial forces from helical gears, start–stop shocks, misalignment, and elevated oil temperatures. The typical bearing toolkit includes cylindrical roller bearings for high radial capacity, tapered roller or angular-contact pairs where thrust control is critical, and spherical roller bearings at non-locating positions to absorb misalignment and shaft growth.