Single row tapered roller bearings metric series and inch series is divided into two types. In the design, its internal and external ring and the tapered roller bearing fixed point is a point in the same center line. Therefore, the roller surface in the roll for real movement, relying on internal and external ring raceway from the synthesis of power, great ribs by squeezing inner guidance. This kind of bearings suitable for radial loads and axial loads and the Synthesis of one-way load and load capacity. The contact angle decreases, the axial load capacity. Matching two sets of bearings generally used. Tapered roller bearings are used in automobile rear axle wheel hub, a large machine tool spindle, power reducers, conveyor rollers and so on. General Cage Cage by stamping, large bearings used car sales support system for the cage or cage.