Tapered roller bearings are capable of carrying both radial and axial loads and permit fine adjustment for end play. Taper roller bearings have tapered inner and outer ring raceways between which tapered rollers are arranged. A logarithmic contact profile provides for optimum stress distribution over the roller and raceway contacts. At moderate speeds the design of the guide flange and large roller ends promotes effective lubricant film formation. However, operation at high speeds demand special lubricating arrangements Tapered roller bearings are widely used in roll-neck applications in rolling mills, transmissions, gear reducers, geared shafting, steering mechanisms, and machine-tool spindles