DS Series Aluminum Single Diaphragm Coupling – Zero Backlash, Clamping Type for Servo/Stepper Motors

Factory direct | High-strength aluminum alloy hubs | 304 stainless steel diaphragm | Zero backlash | High torsional rigidity | 2000 N·m torque | 5000 RPM | Low inertia | Clamping screw design | Anodized finish | OEM/ODM/OBM

The Apexcoupling DS series is a high-performance aluminum single diaphragm coupling engineered for precision power transmission in servo motor, stepper motor, encoder, and CNC applications. Featuring zero backlash operation, high torsional rigidity, and ultra-low inertia, this coupling delivers exceptional positioning accuracy and dynamic response. Constructed from high-strength aluminum alloy with a 304 stainless steel diaphragm in a multilateral arc shape with eight screws, the DS series offers superior torque transmission, anti-vibration performance, and long service life. The clamping screw design ensures secure shaft connection without damaging shafts, while the anodized finish provides enhanced corrosion resistance.

✅ Zero backlash, high rigidity, and low inertia – specifically designed for servo motors, stepper motors, encoders, and precision motion control systems. Clockwise and counterclockwise rotation characteristics are exactly the same.

Key Technical Specifications

🔧 Custom bores, keyways, and special materials available. Contact us with your specifications.

Product Structure

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

2. 304 Stainless Steel Diaphragm – Multilateral arc shape with eight screws – improves precision and torque transmission.

3. Clamping Screws – Secure shaft fastening with clamping hub design – provides even clamping force without damaging shafts.

💡 How it works: The DS series coupling consists of two aluminum hubs connected by a 304 stainless steel diaphragm. Torque is transmitted through the diaphragm, which flexes to accommodate angular, radial, and axial misalignment while maintaining high torsional rigidity. The multilateral arc shape with eight screws enhances precision and torque capacity. This structure is good for anti-vibration, safety, and longer service life.

Product Features & Advantages

Applications

• Servo Motors – High-precision motion control, zero backlash requirement

• Stepper Motors – Accurate positioning, no lost motion

• Encoders – Precision position feedback, zero backlash

• CNC Machines – Feed drives, spindle positioning

• Instrumentation – High-accuracy measurement systems

• Lead Screws – Precision linear motion systems

• Small Pumps – Reliable power transmission

• Feed Rollers – Material handling and feeding systems

• Packaging Machinery – Registration and indexing systems

• Robotics – Joint drives, precision motion

• Automation Equipment – Pick-and-place systems

Why Choose Apex Coupling for DS Diaphragm Couplings?

FAQ

Q: What is a single diaphragm coupling?
A: A single diaphragm coupling consists of two hubs connected by a single stainless steel diaphragm. It transmits torque while compensating for angular, radial, and axial misalignment through the elastic deformation of the diaphragm.

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

Q: What is the 8-screw multilateral arc design?
A: The multilateral arc shape with eight screws improves precision and torque capacity compared to standard designs. This design is a key differentiator of the DS series.

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

Q: What misalignment can the coupling compensate for?
A: The single diaphragm structure compensates for angular, radial (eccentricity), and axial deviations.

Q: What are the rotation characteristics?
A: Clockwise and counterclockwise rotation characteristics are exactly the same – ideal for reversing applications.

Q: What is the clamping screw design?
A: The clamping screw design provides even clamping force around the shaft without damaging it – offering secure shaft connection and easy installation.

Q: Does the coupling require lubrication?
A: No. The DS series is maintenance-free – no lubrication required.

Q: Can I get a custom coupling?
A: Yes. We offer OEM, ODM, and OBM support – custom bores, keyways, and special materials available. For keyway options, add “K” after the bore size (e.g., DS-26×26-7K×8K).

Request a Quote

Send us your bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.