Ball Screws with Cylindrical Nuts

Ball screws with cylindrical nuts use a round, non-flanged ball nut that fits inside a matching housing for a more compact assembly than many flanged-nut designs. PBC Linear miniature ball screw assemblies are available with 6mm, 8mm, and 10mm screw diameters and 1mm, 2mm, or 2.5mm leads, depending on screw size. Lead is the axial distance the nut travels during one complete screw rotation; smaller leads support finer positioning, while larger leads provide more travel per revolution. The steel screw shafts are precision-rolled for consistent lead accuracy over the screw length.

Each cylindrical nut contains a multi-liner ball-return system that guides the recirculating balls through the nut for continuous, low-friction motion. Polymer wipers at both ends help block debris and retain lubrication around the internal ball tracks. Standard-fit nuts provide no more than 0.05mm backlash, while transitional-fit options reduce play and may apply slight preload for greater rigidity and more responsive direction changes. Assemblies support static axial loads up to 2.144kN (482lb), depending on the selected size and configuration. Custom screw lengths, nut fits, and journal machining are available through the custom configurator. A journal is the machined section at one or both screw ends that fits a bearing, coupling, motor, support block, or other mounting component.

• Compact cylindrical ball nut for installation inside a matching housing
• More space-efficient than many flanged-nut designs
• Available in 6mm, 8mm, and 10mm screw diameters
• Lead options of 1mm, 2mm, and 2.5mm, depending on screw size
• Precision-rolled steel screw shafts for consistent lead accuracy
• Multi-liner ball-return system for continuous ball recirculation
• Polymer wipers at both nut ends help block debris and retain lubrication
• Standard-fit nut: no more than 0.05mm backlash
• Transitional-fit nut available for reduced play and optional slight preload
• Static axial load capacity: up to 2.144kN (482lb)
• Custom lengths, nut fits, and journal machining available through the custom configurator
• A journal is the machined screw-end section that fits bearings, couplings, motors, support blocks, or other mounting components

Frequently Asked Questions