Ball Screw Linear Actuators with Cylindrical Nuts and NEMA Motors

Miniature ball screw linear actuators with cylindrical nuts are motor-driven ball screw devices that convert rotary motion into precise linear movement using compact BSR miniature ball screws in 6 mm, 8 mm, and 10 mm screw diameters. Factory-integrated with NEMA 08, 11, 14, 17, and 23 motors, these actuators use cylindrical nut configurations to save space compared with flanged nut designs. These are external ball screw actuator systems because the cylindrical nut travels outside the motor along the exposed screw. The nut is typically attached to the moving load or carriage, while the motor rotates the screw. Because the load prevents the nut from rotating, the nut moves straight forward or backward along the screw. BSR miniature ball screw assemblies are available with 1 mm, 2 mm, and 2.5 mm lead options (a screw lead is the distance traveled after a full rotation), including six metric diameter-and-lead combinations.

Each ball screw nut uses a multi-liner ball return system for smooth ball recirculation, while polymer wipers at both ends of the nut help prevent debris and particulates from entering the assembly. These actuators support static axial loads up to 2.144 kN (482 lb), and preload options are available to increase rigidity, reduce backlash, and improve positional accuracy. Miniature ball screw actuators with cylindrical nuts are well suited for compact automation, medical devices, laboratory equipment, robotics, optical systems, and other precision motion applications where space savings and repeatable linear travel are critical.

• Five metric sizes, measured in diameters x leads
• Cylindrical Nut
• Static axial load: 2.144 kN (482 lb)
• Polymer wipers located at each end of the nut help prevent the ingress of debris and particulates
• Preload option for higher rigidity and better positional accuracy

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