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Screw-down bearing are mainly used in screw-down mechanisms of rolling mills. The kind of bearing has no cage. The entire raceway is full of tapered rollers. It features high axial loading capacity but its limiting speed is low. In order to improve its running performance, the bottom surface of the bearing's top ring is a concave spherical surface (TTSV00) or convex spherical surface (TTSX00).
Because the screw down bearings bear a heavy load, an extreme pressure additive shall be selected as its lubricant. A film of lubricant is applied onto the top ring's self-aligning spherical surface to ensure good surface lubrication and flexible self-aligning.
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