These cylindrical roller bearings are to support the rear portion of the head spindle in machining centers and NC lathes and are exposed to the belt tension and transmission gear reaction.

Accordingly. double-row cylindrical roller bearings with large load capacity are used.

The number of applications increase for a drive system with a motor directly coupled or a built-in system with a motor arranged directly inside the spindle to meet the demand for faster spindle speeds.

In this case, the single-row cylindrical roller bearing has come to be increasingly used because it can reduce the load acting on the rear support bearing.