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Help CenterAluminum Flexible Coupling Bore 5mm 8mm Blue Shaft Coupler for Stepper Motor
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Hebei Speed Torque Transmission Technology Co., Ltd., established in 2017 with a 3,000-5,000 m² factory and over 101-200 skilled employees, presents our premium Aluminum Flexible Coupling Bore 5mm 8mm Blue Shaft Coupler. Designed specifically for stepper motor applications, this coupling delivers exceptional precision, durability, and vibration damping. Our annual export value of US$5-10 million and ISO9001 certification ensure reliable, consistent quality for global customers. Whether you need a standard 5mm to 8mm connection or a customized solution, our coupling offers outstanding performance at competitive prices.
Product Overview
This flexible shaft coupler is machined from high-grade aluminum alloy (6061-T6) and finished with a striking blue anodized coating for corrosion resistance and aesthetic appeal. The two-piece split design with multiple helical cuts provides excellent torsional stiffness while allowing angular, parallel, and axial misalignment compensation – ideal for stepper motor, encoder, and light-duty servo connections. The 5mm and 8mm bore options cater to common stepper motor shaft sizes, ensuring a secure, zero-backlash fit.
Key Features & Benefits
Zero Backlash: One-piece construction eliminates coupling play, maintaining positioning accuracy.
Misalignment Compensation: Helical cuts absorb angular (up to 2°), parallel (up to 0.5mm), and axial (up to ±0.3mm) misalignments – reduces bearing wear and vibration.
Lightweight & Low Inertia: Aluminum body keeps rotational inertia low, essential for stepper motors to achieve rapid acceleration/deceleration.
Corrosion Resistance: Blue anodized layer protects against moisture and chemicals, extending service life.
Easy Installation: Clamp-style hubs with set screws (or optional keyway) provide quick, secure mounting without damaging shafts.
High Rotational Speed: Balanced design supports speeds up to 6,000 rpm (depending on size), suitable for most stepper motor applications.
Customizable Options: Different bore sizes, lengths, and surface finishes available upon request to match your exact requirements.
Technical Specifications (Typical)
| Parameter | Value |
| Material | 6061-T6 Aluminum Alloy |
| Bore Diameter | 5mm (one side) / 8mm (other side) — or custom sizes |
| Outer Diameter | 20mm (standard) / 25mm (optional) |
| Length | 20mm / 25mm / Custom |
| Rated Torque | 0.5–2.0 N·m (depends on size) |
| Max Speed | Up to 6,000 rpm |
| Allowable Misalignment | Angular ≤2°, Parallel ≤0.5mm, Axial ±0.3mm |
| Surface Finish | Blue Anodized (standard), Clear/Black optional |
Detailed Advantages for Stepper Motor Applications
Stepper motors are widely used in 3D printers, CNC routers, robotics, and automation equipment. Our aluminum flexible coupling addresses the most critical challenges in these systems:
Reduced Vibration: The helical slit design acts as a spring damper, minimizing resonance and step-loss.
Improved Positioning Accuracy: No backlash ensures the motor’s rotational displacement is directly transferred to the load without lost motion.
Space-Saving Design: Compact 20mm OD and short length fit tight installations while maintaining high torque capacity.
Cost-Effective: Aluminum construction offers a excellent balance of performance and price compared to stainless steel or beam couplings.
Dual Bore Versatility: The 5mm/8mm combination is ideal for connecting a stepper motor shaft (typically 5mm or 6.35mm) to a lead screw or encoder with 8mm bore.
Why Choose Hebei Speed Torque?
With over 7 years of manufacturing experience, our factory employs 101-200 professionals and operates a 3,000-5,000 m² facility. We hold ISO9001 certification, ensuring every coupling meets stringent quality standards. Our annual export value of US$5-10 million demonstrates global trust from markets across North America, Europe, Southeast Asia, Africa, Oceania, and more.
We ship via Ports of Shanghai, Tianjin, and Qingdao, guaranteeing efficient logistics. Our R&D team continuously improves product designs, and we offer free samples for evaluation (subject to negotiation). Custom bore sizes, keyways, and surface finishes are available with short lead times.
Contact us today to discuss your coupling requirements. Let us provide you with reliable, high-performance transmission solutions that keep your machinery running smoothly.
Frequently Asked Questions (FAQ)
Q: What materials are used in this coupling?
A: It is made of 6061-T6 aluminum alloy and finished with blue anodizing. Other surface treatments (clear, black) are available upon request.Q: Can this coupling handle misalignment?
A: Yes, the helical cut design allows angular misalignment up to 2°, parallel up to 0.5mm, and axial displacement ±0.3mm.Q: Is it suitable for servo motors?
A: While optimized for stepper motors, it can be used for low-torque servo applications. For higher torque or precision, we recommend consulting our technical team.Q: Do you offer custom bore sizes?
A: Yes, we can customize bore diameters from 3mm to 12mm, as well as add keyways or different clamping styles.Q: What is the minimum order quantity (MOQ)?
A: MOQ varies by size and customization. Typically, standard models are available in low quantities; please contact us for details.Q: How long is the delivery time?
A: Standard stock items can be shipped within 3-5 working days. Custom orders usually take 10-15 working days, depending on complexity.Q: What certifications do you have?
A: Our factory is ISO9001 certified. Specific product certificates can be provided upon request.Q: Can I get a sample before bulk order?
A: Yes, sample requests are welcome. Sample cost may be refundable with bulk orders; terms negotiable.
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