Ø40mm CF53 Induction Hardened Linear Bearing Shaft – KM-W-40

Heavy-duty precision shaft for large-scale industrial linear motion

The KM-W-40, 40mm linear bearing shaft from Kiwi Motion is engineered to deliver exceptional strength, rigidity, and long-term accuracy in large-scale industrial motion assemblies.

With a substantial 40 mm diameter, this shaft is designed to handle extreme mechanical loads and long-span linear motion, making it ideal for heavy-duty automation systems and production equipment.

Manufactured from CF53 steel, the KM-W-40 shaft combines excellent core toughness with a wear-resistant hardened surface, ensuring reliable performance in demanding environments.

The shaft undergoes induction hardening to create a durable outer layer that withstands continuous bearing contact and repeated mechanical loading. It is precision ground to an h6 tolerance, with roundness held within 7 µm and straightness within 0.15 mm per metre.

These precision tolerances ensure consistent linear motion with minimal friction, even in oversized systems.

Applications for the 40mm linear bearing shaft

The 40 mm KM-W-40 shaft is ideally suited for large industrial applications where superior load-bearing capacity, high rigidity, and accurate linear travel are critical. Typical uses include:

• Large-scale linear transfer systems in automated production lines
• Heavy-duty gantry systems with extended stroke lengths
• Oversized actuators requiring maximum shaft strength
• Robotics and automated material handling systems
• High-load CNC platforms and custom motion assemblies

Thanks to its increased diameter and stiffness, the KM-W-40 shaft resists deflection across long spans, helping maintain precise alignment and travel accuracy under extreme loads.

Its hardened surface provides excellent resistance to wear and scuffing, supporting long service life in continuous-use environments.

Custom Lengths and End Machining Options

Each 40mm linear bearing shaft is cut to your exact specified length with a precision tolerance of ±0.1 mm. This ensures seamless integration into bespoke machinery or OEM systems without the need for additional processing.

For more complex applications, Kiwi Motion also offers a custom end machining service on request.

We can provide chamfers, threads, flats, or other end features to suit your individual design needs, helping streamline assembly and reduce build time.

Compatible with Kiwi Motion’s Bearings and Shaft Supports

Designed to pair perfectly with Kiwi Motion’s heavy-duty linear bearings and shaft supports, the KM-W-40 shaft delivers exceptional alignment stability and low maintenance throughout the service life of your machine.

This compatibility simplifies system design and ensures long-term mechanical precision across even the most demanding industrial applications.

For projects requiring the highest levels of rigidity, accuracy, and durability in linear motion, the KM-W-40 shaft offers an unrivalled solution.