Linear Motion Precision Shaft Descriptions

MULTISTEEL’s precision linear shafts are key parts for smooth and accurate straight-line movement in machinery and automation systems. They are built to meet international standards and provide great performance and durability. These shafts are perfect for use in automation, robotics, and other industries that require precision.

Made from strong materials and heat-treated for extra strength, our precision linear shafts have precise outside diameters, good straightness, and a smooth surface. A thin layer of chromium improves the hardness, resist wear, and protects against corrosion. The chrome plating gives a smooth, low-friction finish, which is ideal for dynamic motion systems.

We keep a large stock of shafts for quick shipping. We can also customize precision linear shafts to meet your specific needs. We welcome you to contact our team for assistance or, if you have specific needs, send your inquiries and receive a free quote.

Performance Index of Precision Linear Shafts

Applicatinos of Precison Linear Shafts

• Automation Systems: Used in robotic arms, conveyors, and assembly lines for smooth movement.

• Robotics: Essential for precise motion in robotic joints and actuators.

• CNC Machines: Provides accurate motion in CNC lathes and milling machines.

• 3D Printers: Guides the print head smoothly along the X, Y, and Z axes.

• Medical Equipment: Used in devices like imaging machines and surgical robots for precise movement.

• Aerospace: Used in actuators and control systems where precision is crucial.

MULTISTEEL’s Custom Precision Linear Motion Shafts 

Hardened linear shaft

This precision linear shaft is made from steel that has been heat treated, to increase their hardness and wear resistance. It is widely used in the moving part of industrial robots and automatic sliding system devices.

• Increased Wear Resistance

• Improved Strength

• Longer Lifespan

Non-hardened linear shaft

A steel shaft that has not been heat treated. They are generally softer and more malleable compared to hardened shafts.

• Lower Wear Resistance

• Easier to Machine

• Less mechanical strength

Solid linear shaft

Solid linear shafts offer high strength and exceptional resistance to bending. These shafts are ideal for applications that demand durability and precise motion

Hollow linear shaft

Hollow linear shafts are typically used to reduce weight while maintaining structural integrity. Their interior is suitable for inserting measuring wires, compressing air, adding lubricating oil, or for use in robotic arms.

Threaded linear motion shaft

Threaded linear shafts feature external threads at one end or both ends, allowing for easy coupling with nuts, bearings, or other threaded components.

Taped linear shaft

Tapped linear shafts have internal threads (tapped holes) at one end or both ends. These threaded holes allow for the attachment of components using bolts or screws, offering flexible mounting options for various systems.

Why Choose MULTISTEEL For Precision Linear Shafts?

When you choose our precision linear shafts, you benefit from:

• Quality Assurance: We rigorously test each product to ensure it meets industry standards for durability and performance, giving you confidence in every order.

• Expert Support: Our experienced team is always available to assist you with technical advice, product recommendations, or any questions you may have to ensure your needs are met.

• Competitive Pricing: We offer high-quality products at fair prices, ensuring you get the best value without compromising on performance.

• Quick Turnaround: We understand the importance of timely delivery, so we prioritize fast processing and shipping to meet your project deadlines.

Frequent Asked Questions （FAQs）

1. What is a linear shaft?

A linear shaft is a rigid, straight, precision-engineered motion rod used in mechanical systems for linear motion and load support.
These precision linear shafts are essential in applications requiring smooth and accurate movement along a straight path, such as in CNC machines, 3D printers, and robotics.
Typically cylindrical, they are paired with linear bearings or bushings to minimize friction.

2. What is the difference between linear and rotary shaft?

Linear and rotary shafts both have a cylindrical shape and are typically made from similar materials, such as steel or stainless steel. Both require precise manufacturing to ensure smooth and accurate movement. Additionally, both undergo surface treatments like chrome plating or hardening to improve wear resistance, corrosion protection, and overall durability.

Although linear and rotary shafts may look similar, their manufacturing processes and design requirements are different.

Linear Shaft: Designed specifically for linear motion, providing smooth, straight-line movement while minimizing friction. It is commonly used in applications like CNC machines, robots, and conveyor systems.

Rotary Shaft: Designed for rotational motion, rotary shafts transmit torque and power around their axis. They are built to withstand rotational forces and are often reinforced for strength and rigidity. In some cases, a hollow design is used to reduce weight. They are typically found in motors, gear systems, and pumps.

3. What is the best material for a linear shaft?

For most precision shafiting applications, high-carbon steel (with over 0.60% carbon and 0.05% manganese) is ideal. It offers optimal hardness, wear resistance, and durability for smooth, precise motion.

Other materials to consider for linear bearing shafts:

• Stainless Steel: Best for environments exposed to moisture or chemicals, offering excellent corrosion resistance.

• Alloy Steel: Provides extra strength and toughness for high-stress applications.

• Chrome-Plated Steel: Enhances surface hardness and corrosion resistance, ideal for reducing friction.

The right material balances strength, corrosion resistance, and cost for reliable, long-lasting performance.

5. Why Are Linear Shafts Hardened?

Linear motion shafts are hardened to improve strength, wear resistance, and longevity. Hardening allows the shaft to resist abrasion, friction, and heavy loads, ensuring smooth, precise movement over time.

6. What Happens When a Shaft Is Too Soft?

A soft shaft is prone to rapid wear, flexing, or bending under pressure, leading to misalignment and reduced precision. It also has a lower load capacity, making it more likely to fail prematurely and increase maintenance costs.

7. What is the Hardness of a Linear Shaft?

Linear bearing shafts are usually hardened to 50-59 HRC for standard applications, 60-69 HRC for higher performance, and 70-79 HRC for extreme conditions. The hardness ensures the precision linear shafts can endure wear, stress, and maintain precision while preventing damage.