DC Series Aluminum Flexible Helical Coupling – Zero Backlash, 0.5-20 N·m, 9500 RPM for Encoders & Stepper Motors

Factory Direct | High-Strength Aluminum Alloy | Zero Backlash | Integrated Helical Spring Design | 0.5-20 N·m Torque | 9500 RPM | Clamping Screw Fastening | Anodized Finish | Maintenance-Free | OEM Customizable

The Apexcoupling DC series is a high-precision aluminum flexible helical coupling (also known as a beam coupling or slotted coupling) engineered for precision motion control applications. Featuring a one-piece high-strength aluminum alloy construction with an integrated helical spring design, this coupling delivers zero backlash torque transmission, excellent misalignment compensation, and effective vibration damping. The spring-like helical design provides a cushioning effect that protects sensitive components from shock loads. With H7 precision bore, anodized surface, and clamping screw fastening, the DC series is the ideal solution for encoders, resolvers, stepper motors, servo motors, micro motors, 3D printers, CNC machines, and miniature drive systems.

✅ Zero backlash – no lost motion for precise positioning. High-strength aluminum alloy – lightweight and durable. Helical spring design absorbs vibration and compensates misalignment. Anodized finish – corrosion-resistant and professional. Maintenance-free – no lubrication required. Specifically designed for encoders, stepper motors, and servo motors.

Key Technical Specifications

🔧 Custom bores and keyways available. For keyway options, add “K” after the shaft diameter (e.g., DC-25×32-8Kx10K). Contact us with your specifications.

DC Series – Model Range & Specifications

📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.

Model Designation – DC Series

DC-□□×□□-□□×□□

Keyway Option: Add “K” after the shaft diameter for keyway.

• Example: DC-25×32-8K×10K – both bores with keyways

Product Structure

1. One-Piece Aluminum Body – Precision-machined from high-strength aluminum alloy.

2. Helical Spring Design – Flexible beam structure that provides cushioning and misalignment compensation.

3. Clamping Screw Fastening – Secure shaft fixation with even clamping force.

4. Anodized Surface – Corrosion-resistant and professional appearance.

💡 How it works: The DC coupling features a one-piece aluminum body with a helical spring-like structure. This design allows the coupling to flex under load, accommodating angular, radial, and axial misalignment while transmitting torque smoothly. The spring action provides a cushioning effect that absorbs shocks and vibrations, protecting sensitive components like encoders and micro motors. The design provides zero backlash operation, which is crucial for precision control in encoders, servo systems, and automated machinery.

Product Features & Advantages

Why Choose a Helical Beam Coupling?

Helical beam couplings are widely used in precision applications where zero backlash, low inertia, and misalignment compensation are critical. Key advantages include:

• Zero Backlash: Essential for encoders, resolvers, and micro motors where accurate position feedback is required.

• High Misalignment Tolerance: Accommodates angular, radial, and axial misalignment, making them suitable for applications where precision alignment is challenging.

• Low Inertia: The lightweight aluminum design makes them ideal for high-speed operation and quick starts/stops.

• Vibration Damping: The helical spring design absorbs vibrations and shocks, protecting sensitive equipment.

• Maintenance-Free: No lubrication required, reducing downtime and maintenance costs.

Applications

• Encoders & Resolvers – Precision position feedback systems

• Stepper Motors – Accurate positioning and step transmission

• Servo Motors – Precision motion control systems

• 3D Printers – Z-axis coupling, filament drive systems

• CNC Machines – Small CNC machines, engraving machines

• Robotics – Small robot joint drives

• Automation Equipment – Pick-and-place systems, indexing tables

• Medical Devices – Precision medical equipment

• Laboratory Equipment – Precision testing and measurement instruments

Why Choose Apex Coupling for DC Series Helical Couplings?

FAQ

Q: What is a helical coupling (beam coupling)?
A: A helical coupling (also called a beam coupling) is a one-piece flexible coupling with a helical spring-like structure that transmits torque while accommodating misalignment and absorbing vibration.

Q: What is the advantage of the helical spring design?
A: The helical spring design provides a cushioning effect that absorbs shocks and vibrations, protects sensitive components like encoders and micro motors, and compensates for angular, radial, and axial misalignment.

Q: What materials are used?
A: The DC series is manufactured from high-strength aluminum alloy with an anodized finish – lightweight, durable, and corrosion-resistant.

Q: Does the coupling have backlash?
A: No. The DC series features zero backlash – no rotational clearance, ensuring precise positioning for encoders and stepper motors.

Q: What is the bore tolerance?
A: Standard bore tolerance is H7 for precision shaft fit and high concentricity.

Q: Is the coupling maintenance-free?
A: Yes. The DC series is maintenance-free – no lubrication required.

Q: What are the common applications?
A: Encoders, resolvers, stepper motors, servo motors, 3D printers, CNC machines, robotics, and automation equipment.

Q: Can the coupling compensate for misalignment?
A: Yes. The helical spring design compensates for angular (2°), radial (0.10mm), and axial (±0.15mm) misalignment.

Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, keyways, and materials available. For keyway options, add “K” after the shaft diameter (e.g., DC-25×32-8K×10K).

Q: What is the maximum speed?
A: Maximum speed ranges from 3200 to 9500 RPM depending on the model.

Request a Quote

Send us your model (e.g., DC-25×32), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.