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Ball Screws

Ball screws convert rotational motion into controlled linear movement with high efficiency and positional accuracy, making them a standard drive element in precision industrial machinery. Installed as standalone screw-and-nut assemblies or integrated into a complete ball screw actuator, they appear across CNC machine tools, semiconductor equipment, and precision automation systems. PLC Direct supplies Rexroth ball screws as an independent supplier to maintenance and procurement teams sourcing replacement parts for existing installations.

Where Are Ball Screws Used in Industrial Environments?

Ball screws and ball screw actuator assemblies are used wherever industrial machinery requires controlled, repeatable linear positioning with minimal friction and high mechanical efficiency. They are a primary drive element in CNC machine tools, semiconductor equipment, and precision automation systems across a wide range of manufacturing sectors.

Facilities and operations that depend on ball screws include:

CNC machining centers and milling machines for X, Y, and Z-axis linear drive.

Semiconductor and electronics manufacturing equipment for precision wafer and component handling.

Injection molding machines for platen movement and core pull mechanisms.

Precision assembly and test automation for repeatable positioning of tooling and fixtures.

Medical device and laboratory instrument manufacturing, where dimensional accuracy is critical.

A worn or damaged ball screw causes positioning errors and surface finish degradation, directly affecting part quality, making timely replacement essential to maintaining production standards in precision-dependent operations.

Which Brands of Ball Screws Does PLC Direct Stock?

PLC Direct stocks Rexroth ball screws for replacement and maintenance in installed systems.

Rexroth Ball Screw Assemblies: Rexroth manufactures ball screws and ball screw actuator components for precision positioning in CNC machine tools, semiconductor, and industrial automation applications.

All Rexroth ball screw hardware is available as surplus sealed, refurbished, and used.

What Should You Know Before Ordering Ball Screws?

Hardware condition options: Ball screws are available as surplus sealed, refurbished, and used. Surplus sealed units are factory-sealed stock; refurbished units have been inspected and restored to operational condition. Used units are tested as functional. For precision applications, the condition grade should be evaluated against the machine's positional accuracy requirements before ordering.

Compatibility and part identification: Ball screw part numbers encode shaft diameter, lead (linear travel per revolution), overall length, nut configuration, and accuracy grade; all of which affect dimensional fit and positional performance. The complete part number from the machine documentation or existing component nameplate is required before ordering. For ball screw actuator assemblies, motor mounting configuration and housing type add further variables to the compatibility check.

Warranty: All ball screw hardware purchased from PLC Direct carries a standard 1-year warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.

PLC Direct supplies ball screw hardware for replacement and maintenance purposes and does not provide system design, programming, or integration services.

Frequently Asked Questions

Common indicators include increased backlash (detected as lost motion between the motor command and the actual carriage position), audible noise during travel, and visible pitting or scoring on the screw shaft. In precision-machining applications, a deteriorating ball screw typically manifests as dimensional variation in parts before any mechanical symptoms become obvious.

A compatible replacement requires the shaft diameter, lead, overall length, nut type, and accuracy grade from the original component or machine documentation. Substituting a different lead value changes the machine's linear travel per motor revolution, which affects both positioning speed and accuracy.

A ball screw actuator is a complete linear actuator assembly that integrates a ball screw, nut, housing, and end-bearing arrangement into a single unit ready for motor attachment. Individual ball screws are the screw-and-nut drive elements within that assembly, while the actuator adds the mechanical housing and mounting interfaces. When sourcing a replacement, confirming whether the original component is a bare ball screw or a complete ball screw actuator is an important first step.

A ball screw uses recirculating steel balls between the screw shaft and nut, reducing friction and delivering high mechanical efficiency; typically, above 90%. A lead screw relies on direct thread-to-nut contact, which increases friction and reduces efficiency but lowers cost for non-precision applications. Ball screws are the standard choice for applications that require repeatable positioning and smooth motion.

The most common causes are inadequate lubrication, contamination from chips or coolant entering the nut, and operation beyond the component's dynamic load rating. Misalignment between the ball screw axis and the linear guide axis also accelerates wear on both components. Identifying the root cause before installing a replacement reduces the likelihood of early failure recurring.