DM Series Aluminum Flexible Beam Coupling – Zero Backlash, 0.5-20 N·m, 30000 RPM for Encoders & Micro Motors

Factory Direct | High-Strength Aluminum Alloy | Zero Backlash | Integrated Spring Design | 0.5-20 N·m Torque | 30000 RPM | Clamping Screw Fastening | Anodized Finish | Maintenance-Free | OEM Customizable

The Apexcoupling DM series is a high-precision aluminum flexible beam coupling (also known as a helical beam coupling or slotted coupling) engineered for precision motion control applications. Featuring a one-piece high-strength aluminum alloy construction with a spring-like beam design, this coupling delivers zero backlash torque transmission, excellent misalignment compensation, and effective vibration damping. The integrated beam design provides a cushioning effect that protects sensitive components from shock loads. With H7 precision bore, anodized surface, and clamping screw fastening, the DM 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. Spring-like beam design absorbs vibration and compensates misalignment. Anodized finish – corrosion-resistant and professional. Maintenance-free – no lubrication required. Specifically designed for encoders and micro motors.

Key Technical Specifications

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

DM Series – Model Range & Specifications

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

Model Designation – DM Series

DM-□□×□□-□□×□□

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

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

Product Structure

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

2. Spring-Like Beam 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 DM coupling features a one-piece aluminum body with a spring-like beam 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 Beam Coupling?

Beam couplings (helical 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 spring-like beam 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

• Micro Motors – Miniature motor drive connections

• 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 DM Series Beam Couplings?

FAQ

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

Q: What is the advantage of the spring-like beam design?
A: The 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 DM 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 DM series features zero backlash – no rotational clearance, ensuring precise positioning for encoders and micro 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 DM series is maintenance-free – no lubrication required.

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

Q: Can the coupling compensate for misalignment?
A: Yes. The beam 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., DM-25×32-8K×10K).

Q: What is the maximum speed?
A: Maximum speed ranges from 8000 to 30000 RPM depending on the model.

Request a Quote

Send us your model (e.g., DM-25.4×25.4), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.