Double row tapered roller bearings can carry heavy loads and are stiff. They are suitable for the accommodation of combined (radial and axial) loads. And they can locate a shaft axially in both directions with a given axial clearance or a given preload. Double row tapered roller bearings are produced in types of TDO and TDI: – Bearings of type TDO have one double row outer ring (cup) and two inner rings with roller and cage assembly (cones). – Bearings of type TDI comprise one double row inner ring with two roller and cage assemblies and two outer rings. They are mainly used in gearboxes， hoisting equipment， rolling mills and machines used in the mining industry.