Direct mount (square) Support unit for small-sized factory automation equipment

For use with ball screw shaft diameters Ø6 to Ø32

Buk Series

Wide-ranging series

Square, direct-mount type can be selected depending on the mounting pattern, in Fixed-end units, Supported-end units and Combination Sets of both fixed and supported-end units. For use with ball screws of diameter Ø6, 8, 10, 12, 15, 16, 20, 25, 28, and 32.

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 since the combined angular contact ball bearing inside the unit is already appropriately preloaded.

High precision

High precision is achieved in a stable way by using DF type angular contact ball bearing with accuracy grade P5 and contact angle of 30º, 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
Supported-sided: Composed of a bearing housing, bearing, clip washer

    • Component DescriptionBall Screw Support Unit
    • Series NameBUK
    • DescriptionDirect Mount Square Type
    • Ball Bearing TypeFixed End Angular Contact or Supported End Deep Groove
    • Design MeasurementMetric
    • Inner Diameter of Fixed End Bearing06,08,10,12,15,20,25
    • Inner Diameter of Support End Bearing
    • ApplicationSmall factory automation
    • Main MaterialBlackened Structural Steel
    • View Series Summary