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Angular contact bearing balls with α=40° (70000 B type), can accommodate axial loads in one direction only. This type of bearing is typically adjusted against a second bearing. Their bearing rings have an upper and a lower shoulder and are non- separable. Mainly used in a wide range of industries such as automobiles, electrical equipment, machine tools, and aircraft.
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Angular contact bearing balls (type 70000 C) with α=15° can bear unidirectional axial load. When bearing pure radial load, bearings must be installed and used in pairs, because the action line of rolling element load and the action line of radial load are not in the same plane, resulting in internal separation force.
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Drawn Cup Needle Roller Bearings are similar to standard roller bearings except for their much smaller diameter-to-length ratio. They are a very popular bearing style due to their small cross-section (distance between ID and OD). In most cases, a hardened shaft or pin acts as the inner race. Also, rollers are kept parallel to the axis of the shaft by controlling the clearance between the rollers.
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RNA, NK type needle roller bearings, this type of bearing has no inner ring, it is suitable for the support structure with limited radial installation size, and the journal matched with the bearing is directly used as the rolling surface. As the shaft of the raceway surface, the hardware must be hardened and ground, and only when it is processed to the appropriate size and shape accuracy, the entire set of needle roller bearings can have a high life and running accuracy. At the same time, since there is no inner ring, the diameter of the shaft can also be appropriately enlarged, thereby increasing the rigidity.
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