Linear Shafts

Linear shafts are machined cylindrical rods that guide straight-line motion in power transmission and automation systems. Paired with a linear bearing or linear guide, they deliver repeatable movement across mechanical applications. Material choice, surface finish, and dimensional tolerance all influence load capacity and motion accuracy, making shaft selection an important factor in overall system performance.

Browse through RS Australia’s range of steel and aluminium linear shafts with hardness ratings from 56 HRC to 75 HB and diameters from 3mm to 30mm.

Key Benefits & Uses of Linear Shafts

Most industrial linear shafts are designed for demanding motion control applications, and their benefits include:

• High Dimensional Accuracy: Precision-ground linear bearing shaft surfaces ensure smooth, low-friction motion and consistent performance across repeated cycles.
• Versatile Diameters: Standard sizes of linear shafts include 20mm and 25mm options to suit most linear motion assemblies.
• Hardened Steel and Aluminium: Hardness ratings from 56 HRC to 75 HB provide strong load-bearing capacity and wear resistance.
• Linear Bearing Rod Compatibility: Linear drive shafts pair with open and closed bush bearings for straightforward system integration.
• Supported and Unsupported Variants: Support rail options distribute load across multiple points for longer spans or high-load applications.

Shop Our Range of Linear Shafts in Australia

RS Australia stocks linear shafts across four main formats to suit a wide range of applications, from light-duty prototyping through to heavy industrial builds.

Supported Linear Shafts

Supported linear shafts are mounted to rail brackets along their full length, distributing load across multiple points to prevent shaft deflection and binding under heavy loads. These are suitable for heavy-duty linear motion systems where rigidity and consistent shaft alignment are critical.

Closed Bush Shafts

Closed bush shafts are precision-ground and hardened for use with closed linear bearing rods, providing a smooth, low-friction surface that maximises bearing life. The h6 tolerance finish ensures tight dimensional accuracy for consistent performance across automation and industrial applications.

Round Shafts

Standard round linear shafts are available in a range of diameters and lengths, including 20mm and 25mm options. Compatible with open linear bearings, these versatile metal shafts are a cost-effective solution for general-purpose linear guide applications across a wide range of machine builds.

Linear Shaft Support Rails

A linear shaft support rail mounts beneath the shaft along its full length to eliminate deflection and sag under load. Best suited to long-span or high-load linear drive applications where an unsupported shaft would flex and compromise positioning accuracy.

How to Choose the Right Linear Shafts for Your Use

When choosing the ideal linear shaft, consider the following:

• Shaft Diameter: Base your selection on load magnitude, operational speed, and available mounting space.
• Material: Steel suits high-load and precision applications; aluminium linear rod shaft options are preferred where weight reduction and corrosion resistance are priorities.
• Hardness Rating: For ball-type linear bearing rod applications, select a shaft with a minimum surface hardness of 60 HRC. Softer shafts will indent under load and degrade bearing life.
• Tolerance Class: h6 tolerance suits most precision linear guide applications. Looser tolerances such as h8 are acceptable for less demanding or lower-cost builds.
• Shaft Length and Deflection: For long linear motion shaft spans under heavy loads, choose a linear shaft support rail to prevent sag and binding.
• Bearing Compatibility: Closed bush shafts suit closed linear bearings while open linear shafts pair with open bearing formats.
• Environment: Aluminium with anodised coating suits corrosive or weight-sensitive environments. Hardened steel suits general industrial and high-load applications.

Common Industry Applications

Linear shafts are used across a wide range of industries in Australia, including:

• CNC Machining: Linear guide shafts direct cutting tools with high precision across CNC routers, lathes, and milling machines used in manufacturing and fabrication.
• Robotics and Automation: Linear motion shafts drive robotic arms, pick-and-place systems, and conveyor assemblies requiring repeatable, accurate movement.
• 3D Printing: Linear bearing shafts guide print head movement along X, Y, and Z axes for smooth, vibration-free operation.
• Medical Equipment: Accurate and stable linear motion is essential in imaging equipment, laboratory automation, and robotic surgery systems.
• Packaging and Material Handling: Metal shaft assemblies support linear drive shaft motion across packaging lines and automated material handling systems.

Your Trusted Linear Shaft Manufacturer & Supplier in Australia

RS Australia stocks a comprehensive range of linear shafts from trusted brands, including Ewellix Makers in Motion, Bosch Rexroth, and ABB. All products are genuine, durable, and standards-compliant, backed by technical support to help you choose the right shaft for your needs. Consolidate your order by adding other products such as slewing rings, linear bearings, and linear rails in a single transaction. RS Australia also offers fast delivery nationwide, so your components arrive when you need them.

For full delivery details, visit our Delivery page.