Hollow Linear Shafts for Lightweight, Precise, and Reliable Linear Motion Systems
Hollow linear shafts from Baokun provide precise, smooth linear motion while reducing system weight and offering internal space for cables, air tubes, or lubrication lines.
Key Features Include:
- Precision-ground outer surface
- Reduced weight and system inertia
- Compatible with common linear bearings and bushings
- Optional induction-hardened surface
- Carbon steel, alloy steel and stainless steel options
- Custom inside and outside diameters
- Cut-to-length manufacturing
- Threads, flats, grooves and mounting holes available
- Support for prototypes and bulk orders
Hollow Linear Motion Shaft Manufacturer
Baokun supplies precision hollow linear shafts for linear bearings, automation equipment, industrial machinery and custom motion systems. Compared with conventional solid shafts, the hollow structure reduces component weight while providing internal space for cables, air lines, lubricants or other system elements.
Our hollow linear motion shafts are available in different materials, outside diameters, inside diameters and lengths. Surface hardening, chrome plating, precision grinding and custom end machining can be provided according to your drawings and application requirements.
Whether you require standard hollow linear bearing shafts or fully customized components for OEM production, we can help you select a practical solution based on load, operating speed, installation method and working environment.
Specifications of Hollow Linear Shafts
| Feature | Specification |
|---|---|
| Applications | Automation equipment, precision instruments, mechanical systems |
| Material Options | CK45, GCr15 |
| Outer Diameter | 8 mm – 80 mm (custom sizes available) |
| Heat Treatment | Induction hardened |
| Surface Hardness | HRC 58 ± 2 |
| Surface Treatment | Hard chrome plated |
| Chrome Thickness | 20 – 30 μm |
| Tolerance Grades | h7, g6, h6 |
| Roundness | Max 3.0 μm |
| Straightness | Max 5.0 μm |
| Surface Roughness | Max 1.5 μm |
| Machining Options | Threading, reduced diameter, coaxial holes drilled/tapped, flats (single/multi), keyways, snap ring grooves, radial holes, chamfering |
Applications of Hollow Linear Shafts
Industrial Automation
Hollow linear shafts are widely used in automated assembly lines, pick-and-place systems, material handling equipment, and positioning units. When combined with linear bearings, they support accurate and repeatable motion during continuous production.
CNC and Processing Equipment
CNC machines, engraving systems, cutting equipment, and inspection devices use hollow linear motion shafts to guide moving components. Their precision-ground surfaces help reduce friction, improve positioning accuracy, and support consistent machining performance.
Robotics and Handling Systems
In robotic arms, transfer systems, and automated handling equipment, hollow shafts help reduce moving weight and inertia. This can support faster acceleration, smoother operation, and lower energy consumption.
Packaging and Printing Machinery
Packaging machines, filling systems, labeling equipment, and industrial printers require reliable repeated movement. Hollow linear shafts guide feeding units, sealing components, print heads, and sliding mechanisms with consistent accuracy.
Medical and Electronics Equipment
Hollow shafts are also used in medical devices, laboratory automation, semiconductor equipment, and electronics manufacturing systems. These applications benefit from their clean design, precise movement, and ability to route cables or tubes internally.
Partner With Today For Reliable Hollow Linear Shafts
Baokun supplies bulk hollow linear shafts for automation, CNC machinery, robotics, packaging equipment, and precision motion systems. Custom diameters, lengths, materials, surface treatments, tolerances, and end machining are available to match your drawings. Controlled production, inspection, flexible order quantities, and export packaging help distributors and manufacturers secure consistent quality, responsive service, and dependable delivery. Contact us for a quote.
Hollow Linear Shaft vs. Solid Linear Shaft
| Feature | Hollow Linear Shaft | Solid Linear Shaft |
|---|---|---|
| Weight and Inertia | Lower weight can reduce system mass and inertia, making it beneficial for moving assemblies and high-speed motion systems. | Higher weight increases system mass but may be acceptable in stationary or heavy-duty applications. |
| Rigidity and Load Capacity | Provides a favorable rigidity-to-weight ratio, but generally has lower bending stiffness than a solid shaft of the same material and outside diameter. | Provides greater bending rigidity and load capacity when material, diameter, length and support conditions are the same. |
| Cost Considerations | Uses less material, but precision tubing, heat treatment, grinding and custom machining may increase manufacturing costs. | Usually has a simpler structure and may be more economical for standard sizes and straightforward machining. |
| Precision and Motion Stability | Can provide smooth, repeatable linear motion when diameter tolerance, straightness, hardness and surface finish are properly controlled. | Can achieve the same high level of precision while offering better resistance to deflection under heavy loads. |
| Internal Routing | The hollow center can accommodate cables, pneumatic tubes, lubrication lines or other system components. | Does not provide internal routing space. |
| Maintenance and Service Life | A hardened and precision-ground surface can provide reliable wear resistance. Lower weight may also reduce the load on certain moving components. | Offers strong resistance to bending and deformation, but service life still depends on hardness, surface quality, lubrication, alignment and operating load. |
| Design Flexibility | Suitable for lightweight designs, internal routing and customized inside and outside diameters. | Suitable for conventional designs where maximum rigidity and simple construction are priorities. |
Choose a hollow linear shaft when:
- Reducing machine or moving-component weight is important.
- Lower inertia can improve acceleration and deceleration.
- Cables, pneumatic tubes or lubrication lines need to pass through the shaft.
- The application requires a favorable rigidity-to-weight ratio.
- Custom inside diameters, end threads, holes or mounting features are required.
- The calculated shaft deflection remains within the acceptable limit.
Choose a solid linear shaft when:
- The application involves high radial loads.
- Maximum bending rigidity is required.
- Shaft deflection must be tightly controlled.
- The unsupported shaft span is relatively long.
- The available installation space prevents the use of a larger hollow shaft diameter.
- Internal cable or tube routing is not required.
- A simpler and potentially more economical standard shaft is preferred.
Wholesale Hollow Linear Shafts Buying Guide
Confirm Shaft Dimensions
Check the outside diameter, inside diameter, wall thickness, total length, and required tolerances. The outside diameter must match the linear bearing, while the wall thickness should provide enough rigidity for the expected load and unsupported span.
Select the Right Material
Hardened carbon steel is commonly used for wear resistance and stable linear motion. Stainless steel is a better option for humid, clean, or mildly corrosive environments. Material selection should consider load, corrosion exposure, and service-life requirements.
Evaluate Surface Quality
Precision grinding, surface hardness, straightness, and roughness directly affect bearing movement and shaft durability. Chrome plating can provide additional wear and corrosion protection for demanding industrial applications.
Check Custom Machining Options
Confirm whether the supplier can provide threads, tapped holes, grooves, flats, radial holes, chamfers, or stepped ends. Sending a complete technical drawing helps prevent production errors and improves quotation accuracy.
Review Supplier Capabilities
Before placing a wholesale order, evaluate production capacity, quality-control procedures, inspection reports, lead times, packaging, and customization support. Request samples when possible to verify dimensions, surface quality, and bearing compatibility before bulk production.
FAQ
What are the disadvantages of a hollow linear shaft compared with a solid shaft?
A hollow linear shaft generally has lower bending rigidity than a solid shaft made from the same material and with the same outside diameter. It may therefore experience greater deflection under heavy loads, long unsupported spans or demanding operating conditions.
Its performance depends strongly on the outside diameter, inside diameter, wall thickness, shaft length and mounting method. Hollow shafts may also require more specialized raw materials and machining, so they are not always less expensive than standard solid shafts. For high-load applications requiring maximum rigidity, a solid linear shaft may be the better option.
What are hollow linear shafts used for?
Hollow linear shafts are used to guide linear bearings and moving assemblies in machinery where low weight, accurate movement or internal routing space is required. Common applications include industrial robots, CNC equipment, automated assembly lines, packaging machines, printing equipment, inspection systems and medical devices.
The hollow center can accommodate electrical cables, pneumatic tubes, lubrication lines or sensor wiring, helping create a cleaner and more compact machine design. Hardened and precision-ground hollow shafts can also provide the smooth, wear-resistant running surface required by linear ball bearings.
Can hollow linear shafts be used with linear ball bearings?
Yes. A hollow linear shaft can be used with linear ball bearings when its outside diameter, tolerance, straightness, surface hardness and surface finish meet the bearing manufacturer’s requirements. The bearing model should be provided when ordering so the supplier can confirm the appropriate shaft fit and specifications.
How do I choose the correct wall thickness for hollow linear shafts?
The required wall thickness depends on the shaft diameter, unsupported length, load, mounting method and allowable deflection. A thicker wall generally improves bending rigidity, while a thinner wall reduces weight. For long spans or heavy loads, shaft deflection should be calculated before confirming the inside diameter.
Can hollow linear shafts be customized?
Yes. Hollow linear shafts can be customized in outside diameter, inside diameter, length, material, hardness, surface treatment and dimensional tolerance. Additional machining may include threads, tapped holes, radial holes, flats, grooves, chamfers and stepped ends. Providing a technical drawing helps ensure accurate production and quotation.
What information is needed to request a hollow linear shaft quote?
To receive an accurate quotation, provide the outside diameter, inside diameter, overall length, material, surface treatment, hardness, tolerance, straightness requirement and order quantity. You should also include the linear bearing model, application details and a drawing showing any threads, holes, grooves or custom end machining.
How are hollow linear shafts manufactured?
Hollow linear shafts are typically manufactured from high-quality seamless steel tubes. The material is cut to length, straightened, precision ground, and polished to achieve accurate diameter and surface finish. The shaft may then undergo induction hardening and chrome plating to improve wear resistance, corrosion protection, and service life. Final inspections check straightness, hardness, dimensional tolerance, and surface quality.
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