When working with linear motion systems, selecting the correct shaft support for your shaft diameter is critical to ensure smooth performance, alignment accuracy, and system longevity. If you’re using a 20mm shaft, choosing the appropriate shaft support might seem straightforward—but there’s more to consider than just the number.
In this article, we’ll walk you through the key factors to determine the right size shaft support for a 20mm shaft and avoid common mistakes during selection or installation.
✅ Standard Shaft Support Sizes for 20mm Shafts
Shaft supports are designed to match the outer diameter (OD) of linear shafts. For a 20mm shaft, you typically need a 20mm inner bore support block—this sounds obvious, but let’s break it down further.
Common shaft support types for 20mm shafts include:
- SHF20 (End Shaft Support): Closed-type shaft support, fixed at the end of the shaft.
- SK20 (Open Block Shaft Support): Clamping-type block support, often used in pairs.
- TBR20 (Rail Shaft Support): For supported linear rail shafts.
🧰 Important: Always match your shaft support model to your shaft diameter exactly (e.g., SHF20 fits a 20mm shaft).
⚙️ Other Key Selection Factors (Not Just Diameter)
While the 20mm size is the starting point, here are 4 important factors to consider before buying:
1. Load Requirements
- Heavier loads may need double supports or closed-type brackets for stability.
- Consider the bending moment—especially in longer shafts.
2. Mounting Type
- Choose between:
- End supports (fixed on both ends)
- Rail supports (continuous support under shaft length)
3. Material
- Aluminum is lightweight, corrosion-resistant—ideal for general automation.
- Steel or cast iron supports offer more rigidity for high-load or high-temp environments.
4. Tolerances and Fit
- Make sure the shaft fits snugly into the support without excessive force.
- Confirm the H7 fit standard if you’re working with precision components.
🛠️ Installation Tips for 20mm Shaft Supports
- Always align both shaft supports perfectly to avoid premature wear.
- Use a torque wrench to prevent over-tightening.
- Lubricate contact points if applicable to reduce friction and noise.
💡 Common Use Cases for 20mm Shaft Supports
- 3D Printers & CNC Machines: 20mm shafts are commonly used in mid-to-heavy-duty linear motion systems.
- Packaging Lines: For handling medium-weight moving assemblies.
- Automated Inspection Systems: Where precision and repeatability are required.
📌 Conclusion
If you’re using a 20mm shaft, you’ll need a shaft support designed for 20mm diameter—like SHF20 or SK20. However, choosing the right size goes beyond just matching the number. You should also consider your load, mounting conditions, material requirements, and fit tolerance to ensure a reliable and long-lasting automation setup.
Still not sure which shaft support suits your project?
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