DST Aluminum Step Single Diaphragm Coupling – Zero Backlash for Servo & Stepper Motors

Factory Direct | High-Strength Aluminum Alloy | 304 Stainless Steel Diaphragm | Zero Backlash | High Torsional Rigidity | 1-80 N·m Torque | 10000 RPM | Clamping Screw Fastening | Low Inertia | Step (Stepped) Design | Maintenance-Free | OEM Customizable

The Apexcoupling DST series is a high-precision aluminum single diaphragm coupling featuring a unique step (stepped) design that provides enhanced stress distribution and misalignment compensation. Engineered for demanding motion control applications, this coupling delivers zero backlash torque transmission with high torsional rigidity and excellent fatigue resistance. The step design creates additional space for the diaphragm to flex, dispersing concentrated stress and延缓 fatigue crack propagation, significantly extending service life. With clamping screw fastening, H7 precision bore, and maintenance-free operation, the DST series is the ideal solution for servo motors, stepper motors, encoders, lead screws, and precision automation equipment.

✅ Zero backlash – no lost motion for precise positioning. Step (stepped) design – enhanced stress distribution and longer service life. 304 stainless steel diaphragm – excellent fatigue resistance and corrosion resistance. Low inertia – ideal for high-speed operation up to 10000 RPM. Maintenance-free – no lubrication required. Specifically designed for servo and stepper motors.

Key Technical Specifications

🔧 Custom bores and keyways available. For keyway options, add “K” after the shaft diameter (e.g., DST-56×45-12Kx14K). Contact us with your specifications.

DST Series – Model Range & Specifications

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

Product Structure

1. Two Aluminum Hubs – High-strength aluminum alloy, precision-machined, anodized finish.

2. Single 304 Stainless Steel Diaphragm – Provides flexibility, misalignment compensation, and excellent fatigue resistance.

3. Step (Stepped) Design – Creates additional space for the diaphragm to flex, dispersing concentrated stress and延缓 fatigue crack propagation.

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

💡 How it works: The DST coupling consists of two aluminum hubs connected by a single 304 stainless steel diaphragm. The unique step (stepped) design creates additional space for the diaphragm to flex during operation, dispersing concentrated stress and延缓 the onset of fatigue cracks. Torque is transmitted through the diaphragm, which flexes to accommodate angular and axial misalignment while maintaining high torsional rigidity and zero backlash. The design provides zero backlash operation, which is crucial for precision control in servo systems and automated machinery.

Step (Stepped) Design – Key Advantage

The DST series features a unique step (stepped) design that offers several advantages over standard flat diaphragm couplings:

💡 The step design is a key differentiator of the DST series, providing longer service life compared to standard flat diaphragm couplings.

Product Features & Advantages

Applications

• Servo Motors – High-precision motion control systems

• Stepper Motors – Accurate positioning and step transmission

• Encoders – Precision position feedback systems

• Lead Screws – Precision linear motion systems

• CNC Machines – Feed drives, positioning systems

• Robotics – Joint drives, precision motion

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

• Laser Cutting Equipment – Precision positioning

• General Industrial Machinery – High-precision power transmission

Why Choose Apex Coupling for DST Diaphragm Couplings?

FAQ

Q: What is the advantage of the step (stepped) design?
A: The step design creates additional space for the diaphragm to flex during operation, dispersing concentrated stress and延缓 fatigue crack propagation, significantly extending the service life of the coupling.

Q: What is a single diaphragm coupling?
A: A single diaphragm coupling consists of two aluminum hubs connected by a single stainless steel diaphragm. It transmits torque while compensating for angular and axial misalignment with zero backlash and high torsional rigidity.

Q: What materials are used?
A: The hubs are made of high-strength aluminum alloy with anodized finish. The diaphragm is made of 304 stainless steel – offering excellent fatigue resistance and corrosion resistance.

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

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

Q: What are the common applications?
A: Servo motors, stepper motors, encoders, lead screws, CNC machines, robotics, and automation equipment.

Q: Can the coupling compensate for misalignment?
A: Yes. The single diaphragm design compensates for angular and axial 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., DST-56×45-12K×14K).

Q: What is the maximum speed?
A: Maximum speed ranges from 8000 to 10000 RPM depending on the model.

Request a Quote

Send us your model (e.g., DST-56×45), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.