The Timken? Hydra-Rib? bearing is a tapered roller design available in any class of precision to maintain optimum spindle system preload. The Hydra-Rib bearing has a floating outer race rib, positioned by hydraulic or pneumatic pressure, and is in contact with the large roller ends instead of the usual fixed inner race rib. This retains system stiffness while allowing for thermal expansion. Its floating rib design allows the bearing to compensate for thermal growth variations while maintaining the optimum setting and accuracy for a variety of speeds and loads.
ID 50.000 mm to 270.000 mm (1.9685 in. to 10.6299 in.)
OD 104.000 mm to 375.000 mm (4.0945 in. to 14.7638 in.)
Additional rollers accommodate larger loads.
Cage features two rings at each end of the rollers.
Cage pins are threaded in the center of each roller and welded at the ends.