Round Fixed-end Support unit for machine tools

For use with ball screw shaft diameters Ø20 to Ø50

But Series

Compact and easy to mount

Because of its compact design with respect to the space around the mounting area, the support unit can be easily mounted without any preparation as the high-precision thrust angular contact ball bearing for ball screw inside the unit is already appropriately preloaded. In addition, the special lock nut for bearing with built-in looseness preventive function allows for high-precision mounting.

High precision and high rigidity

High precision and high rigidity are achieved in a stable way by using DF type thrust angular contact ball bearing with accuracy grade P4 and contact angle of 60º, in addition to enclosing an appropriate amount of grease inside the bearing.


Seals are provided on both ends of bearing for dustproofing.


Fixed-sided: Composed of a bearing housing, bearing, cover flange, lock nut, set screw, spacer, seal
(No Support-sided unit available for BUT Series)

    • Component DescriptionBall Screw Support Unit
    • Series NameBUT
    • DescriptionFlanged Round Type
    • Ball Bearing TypeFixed End High-thrust Angular Contact
    • Design MeasurementMetric
    • Inner Diameter of Fixed End Bearing20,25,30,35,40
    • Inner Diameter of Support End Bearing
    • ApplicationMachine tool
    • Main MaterialBlackened Structural Steel
    • View Series Summary