Ball Screw Linear Actuators

Ball screw linear actuators combine a ball screw, ball nut, and motor to convert motor rotation into controlled linear motion. PBC Linear BS Series miniature ball screw actuator assemblies use an external-nut design in which the motor rotates the exposed ball screw while the restrained cylindrical or flanged nut travels axially along it. The pre-assembled units are available in NEMA 08, 11, 14, 17, and 23 frame sizes with six standard screw-diameter-and-lead combinations: 6mm × 1mm, 6mm × 2mm, 8mm × 1mm, 8mm × 2mm, 8mm × 2.5mm, and 10mm × 2mm.

Standard configurations are supplied without preload, while preload is available to reduce play and increase rigidity and positional accuracy. Polymer wipers at both ends of the nut help block debris and retain lubrication around the recirculating balls. Standard and custom journal machining is available for one or both screw ends; a journal is the machined end section that fits a bearing, coupling, motor connection, or support block. Fixed and floating end blocks are also available to support the screw while allowing for alignment and thermal expansion. For applications requiring more configuration choices, the BE Series offers the same five NEMA frame sizes and 6mm–10mm screw-diameter range with additional motor lengths, lead options, nut styles, and performance combinations.

• Five frame sizes: NEMA 08/11/14/17/23 and screw diamaters of 6,8,10mm
• Flanged and cylindrical nut configurations
• Preload option for higher rigidity and better positional accuracy
• Polymer wipers located at each end of the nut help prevent the ingress of debris and particulates
• Standard and special machined journals available (fixed or floating)
• Fixed and floating end blocks available

Features & Specifications of Ball Screw Linear Actuator Motor Assemblies

Frequently Asked Questions