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!

Product Details

Ø12mm CF53 Induction Hardened Linear Bearing Shaft- KM-W-12
Precision shaft for low to medium load industrial linear motion
The KM-W-12, 12mm linear bearing shaft from Kiwi Motion is a precision-engineered solution designed to provide stable, repeatable linear motion in a wide range of low to medium load applications.
With a diameter of 12 mm, it offers a balance of stiffness, durability, and accuracy, making it ideal for both industrial and laboratory environments.
Manufactured from high-quality CF53 steel, each KM-W-12 shaft is precision ground and induction hardened to ensure excellent surface hardness and long service life.
The 12mm linear bearing shaft is finished to an h6 tolerance, with roundness controlled within 5 µm and straightness within 0.20 mm per metre.
This high level of precision delivers smooth, low-friction linear motion and consistent performance in both static and dynamic systems.
Applications for 12mm linear bearing shaft
The 12 mm diameter KM-W-12 shaft is particularly well suited to applications requiring moderate rigidity and wear resistance, where a smaller shaft may not provide adequate stability. Typical uses include:
- Gantry axes in automation and CNC systems
- Industrial tools and production jigs
- Robotic arms and pick-and-place systems
- 3D printers and desktop CNC machines
- Laboratory automation and inspection equipment
- Transport mechanisms for materials handling
Its robust construction allows it to maintain alignment and resist deflection under dynamic forces, making it a reliable choice for continuous duty applications.
The hardened surface also resists wear and scoring, helping to preserve long-term accuracy and repeatability.
Custom Lengths for Easy Integration
Each 12mm linear bearing shaft is cut to the customer’s specified length, with a precision tolerance of ±0.1 mm. This enables fast and accurate integration into custom machine builds or retrofit projects, eliminating the need for additional post-processing or adjustment.

Additional end machining is available upon request.
Compatible with Kiwi Motion’s Bearings and Shaft Supports
Designed for seamless compatibility with Kiwi Motion’s full range of linear bearings and shaft supports, the KM-W-12 shaft ensures a perfect fit and minimal installation effort.
This allows engineers to quickly assemble precision linear motion systems that maintain mechanical stability over time.
For industrial linear motion applications requiring moderate rigidity, excellent wear resistance, and reliable performance, the KM-W-12 offers an ideal balance of precision and value.
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KM-W-12
High Performing Actuators
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!





