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China tapered roller bearings have taper-formed raceways on inner and outer rings, and have taper-formed rollers between raceways. When the tapered sliding surfaces of the outer and inner rings as well as the rolling elements are extended, they would converge towards the same single point on the bearing axis line. These bearings can accommodate radial-axial combined loads replying mainly on radial load. The capacity of carrying axial load varies with the contact angle ? of the outer ring raceway, the greater the angle, the larger the capacity. Tapered roller bearings are separable formed bearings. Their rollers, cage and inner ring are called as cone, outer ring are named as cup. Cone and cup can be mounted respectively. The bearings are classified by elements as single row, double row and multiple row bearings.