Ballscrew actuator that we ordered through Kiwi Motion looks and performs great. Swiss quality!
Well Specified Linear Actuators
The actuator runs smoother and quieter than previously used actuators. Also, it runs faster from start, so we can drive faster.

Superb service from start to finish
I can just tell Kiwi what I need and I can trust they will go away and sort the right product at the right time.

Well packaged Linear Shafts
Well packaged item, as described and dispatched quickly. Thank you
High Quality Linear Rail and Guides
We received the new components on the Wednesday afternoon and installed them the following morning. Parts were perfect and of great quality!
That you kindly for your assistance, fantastic service you’re running over there!

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Product Details

Ø5mm CF53 Induction Hardened Linear Bearing Shaft – KM-W-5
Precision shaft for compact linear motion applications
The KM-W-5, 5mm linear bearing shaft from Kiwi Motion is a precision-engineered component designed to deliver smooth, repeatable motion in small-scale linear assemblies.
With a diameter of 5 mm, it is ideally suited to compact automation equipment, benchtop instruments, and lightweight linear motion systems where space, weight, and accuracy are key considerations.
Manufactured from high-grade CF53 steel, the KM-W-5 shaft offers exceptional surface hardness and wear resistance.
Each 5mm linear bearing shaft undergoes induction hardening, creating a durable outer layer that maintains its precision even after extended use.
The shaft is finished to an h6 tolerance, with roundness controlled within 4 µm and straightness within 0.25 mm per metre.
This ensures a precise fit with linear bearings, helping to achieve consistent and smooth motion in any supported application.
Applications for 5mm linear bearing shaft
The 5 mm linear bearing shaft is an excellent choice for designers and engineers developing compact automation systems and light-duty linear motion assemblies. Typical applications include:
- Test rigs and inspection systems
- Benchtop scientific and medical instruments
- Lightweight pick-and-place mechanisms
- Small-format 3D printers and CNC equipment
- Precision measuring devices
Its finely ground surface and hardened exterior provide excellent resistance to wear, scoring, and deformation, even when used with recirculating ball bushings or under continuous motion.
This makes it highly suitable for applications where durability and repeatability are essential.
Custom Lengths for Easy Integration
Every 5mm linear bearing shaft is cut to the customer’s required length, accurate to ±0.1 mm. This allows for easy integration into custom machine builds and linear assemblies.

Whether you need a single shaft or a batch for production use, Kiwi Motion delivers shafts ready to install.
Compatible with Kiwi Motion’s Bearings and Supports
The KM-W-5 shaft is fully compatible with Kiwi Motion’s extensive range of linear bearings.
This ensures a perfect match between shaft and support components, making it easier to design systems that maintain long-term precision and reliability.
For precision linear motion in small and lightweight assemblies, the KM-W-5 offers outstanding performance, durability, and value.
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