Precision shafts: High-Precision linear shafts for maximum accuracy in linear motion systems
Our precision shafts form the foundation of precise motion and guidance systems in modern linear technology. In combination with ball bushes, linear bearings, or shaft guidance systems, they enable precise, low-friction linear movement—ideal for CNC machines, automation systems, and high-precision production equipment.
As the inner raceway of a bearing system, our precision shafts ensure absolute dimensional accuracy, stability, and durability -even under high loads or combined rotational and linear motion. Each shaft is manufactured with maximum precision and tightly controlled tolerances to guarantee optimal running performance.
All PGM Motion precision shafts are manufactured in Germany and inspected according to ISO 286 (g6 tolerance) and DIN 748/1-C standards.
Every shaft undergoes a 100% inspection for runout, hardness, and surface finish (Ra < 0.2 µm).
This ensures consistent precision and long service life backed by nearly 17 years of experience in linear motion manufacturing.
Technology & design of precision shafts
- Precision raceway surface: The shafts are fine-ground and hardened, ensuring uniform, low-wear motion over long operating periods.
- Wide range of dimensions: We offer precision shafts in all common diameters, including 6 mm, 10 mm, 15 mm, 20 mm, 30 mm, and 40 mm.
- Material Options: Common materials include CF53 for standard applications requiring high strength, as well as stainless steel grades for corrosion-resistant environments.
- Accuracy Classes:Our shafts are custom-made, for example according to tolerance class g6, to ensure a perfect fit with ball bushings or guide shaft bearings.
- Optional Configurations: On request, precision shafts are also available with threads or retaining grooves -ideal for mounting, clamping, or integration into complex systems.
Material selection & manufacturing - Precision starts with the right material
Depending on the application, we offer CF53 steel for high load capacity and stainless steel (X90CrMoV18) for corrosion-resistant environments.
Both variants are induction hardened and precision ground, forming the basis for long service life and dimensional accuracy.
Advantages of our precision shafts
- Maximum dimensional accuracy: Minimal tolerances ensure precise and consistent motion in any application.
- Optimized running rerformance: The finely polished surface reduces friction and ensures smooth, quiet, and jerk-free operation.
- Combined motion capability: Suitable for both pure linear motion and rotational movement.
- High load capacity and durability: Thanks to induction hardening and precise surface treatment, the shafts are highly resistant to wear.
- Compatibility with common linear systems: Ideal in combination with linear rails, ball bushes, roller guides, and other linear drive systems.
Application areas
- CNC Machines and production systems: For axis guidance, feed systems, and positioning units
- Automation and robotics: In pick-and-place systems, linear axes, or handling modules
- Measurement and testing technology: For highly precise motion with maximum repeatability
- Special-purpose machinery: Custom-designed precision shafts with threads or special tolerances for customer-specific designs.
- Medical technology & packaging systems: Corrosion-resistant stainless steel variants for hygiene-critical environments
Precision in every dimension
Whether precision shafts in 6 mm, 10 mm, 15 mm, 20 mm, 30 mm, or 40 mm, each linear shaft is manufactured according to strict quality standards. Our products meet the requirements of leading manufacturers in CNC machinery, automation systems, and linear motion components.
Shafts made from CF53 steel with g6 tolerance offer excellent hardness and sliding properties, ensuring maximum fit accuracy with minimal backlash.
For applications requiring additional mounting options, precision shafts are also available with threaded ends.
Why choose PGM Motion precision shafts?
- Decades of experience in linear motion technology
- High availability of standard diameters from stock
- Custom solutions tailored to your specific requirements
- Compatibility with all common ball bushes and guidance systems
- Quality designed for precision and durability
Our engineering team supports you in selecting the right diameter, material, and tolerance class.
FAQ - frequently asked questions about precision shafts
1. What is the difference between a precision shaft and a standard shaft?
Precision shafts are finely ground, hardened, and manufactured to tight tolerances (e.g. g6). This makes them ideal for high-accuracy, low-friction applications such as CNC machines and linear systems. Standard shafts are typically untreated and designed for simpler movements without strict tolerance requirements.
2. What materials are used for precision shafts?
Typically CF53 steel is used for high strength and stainless steel (e.g. X90CrMoV18) is used in corrosive environments. Both materials offer excellent wear resistance and are well suited for industrial applications.
3. What does the g6 tolerance class mean for precision shafts?
The g6 designation refers to a tight dimensional tolerance according to ISO 286. It ensures an optimal fit with linear bearings, ball bushes, or housing units. A g6 shaft significantly reduces backlash and improves smooth running performance.
4. When should I choose a precision shaft with threaded ends?
A threaded precision shaft is used when fixation or axial mounting is required—for example, for integration into assembly units or as a stop element in linear systems.
5. Which diameters are most commonly used?
Typical sizes include 6 mm, 10 mm, 15 mm, 20 mm, 30 mm, and 40 mm. The correct choice depends on required rigidity, load capacity, and compatibility with linear bearings or ball bushes.
6. How do I choose the right precision shaft for my application?
Selection depends on load, movement frequency, environmental conditions, and the mating component (e.g. ball bush or linear bearing). Our experts are happy to assist you in selecting the optimal solution.
7. Are custom lengths or machined ends available?
Yes, shafts can be manufactured to custom lengths and with features such as threaded ends, cross-drilled holes, or keyways according to your specifications.
