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DS Series Aluminum Single Diaphragm Coupling – Zero Backlash, 1-80 N·m, 10000 RPM
Model Number
Check below, custom
DS-D12-L12.35
DS-D16-L17
DS-D19-L20
DS-D20-L23
DS-D26-L26
DS-D29-L25.7
DS-D32-L28
DS-D33-L28.5
DS-D34-L32
DS-D39-L34.5
DS-D44-L34.5
DS-D56-L45
DS-D68-L53
DS-D82-L68
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DS Series Aluminum Single Diaphragm Coupling – Zero Backlash, 1-80 N·m, 10000 RPM for Encoders & Servo Motors
Factory Direct | High-Strength Aluminum Alloy | 304 Stainless Steel Diaphragm | Zero Backlash | 1-80 N·m Torque | 10000 RPM | Clamping Screw Fastening | Low Inertia | Maintenance-Free | OEM Customizable
The Apexcoupling DS series is a high-precision aluminum single diaphragm coupling engineered for precision motion control applications. Featuring a high-strength aluminum alloy body and a 304 stainless steel diaphragm, this coupling delivers zero backlash torque transmission, excellent misalignment compensation, and effective vibration damping. The single diaphragm design provides high torsional rigidity, low inertia, and the ability to compensate for angular and axial misalignment. With clamping screw fastening, H7 precision bore, and maintenance-free operation, the DS series is the ideal solution for encoders, resolvers, stepper motors, servo motors, lead screws, instrumentation, small pumps, feed rollers, and light to medium-duty drive systems.
✅ Zero backlash – no lost motion for precise positioning. 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. Widely used in encoders, instrumentation, lead screws, and servo motor drives.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | DS (Single Diaphragm Coupling) |
| Type | Flexible / Disc / Diaphragm |
| Structure | Single diaphragm |
| Body Material | High-strength aluminum alloy |
| Diaphragm Material | 304 stainless steel – excellent fatigue resistance, corrosion-resistant |
| Surface Treatment | Anodized (custom colors available) |
| Design | One-piece aluminum hubs + single 304 stainless steel diaphragm |
| Backlash | Zero – no rotational clearance |
| Bore Tolerance | H7 – high concentricity and precise shaft fit |
| Bore Diameter Range | 3 – 40 mm (custom available) |
| Outer Diameter Range | 19 – 82 mm |
| Length Range | 20 – 68 mm |
| Rated Torque | 1 – 80 N·m |
| Maximum Speed | 8000 – 10000 RPM (varies by model) |
| Allowable Eccentricity | 0.10 mm |
| Allowable Deflection Angle | 1° |
| Allowable Axial Deviation | ±0.09 to ±0.50 mm (varies by model) |
| Misalignment Compensation | Angular and axial (single diaphragm design) |
| Vibration Damping | Yes – diaphragm absorbs shock and dampens vibration |
| Fastening Method | Clamping screw (positioning screws) |
| Maintenance | None required – maintenance-free |
| Operating Temperature | -30°C to +100°C (depending on application) |
| Customization | OEM – custom bores, keyways, and materials |
| Applicable Industries | Encoders, resolvers, stepper motors, servo motors, lead screws, instrumentation, small pumps, feed rollers, CNC machines, automation equipment |
| Place of Origin | Guangdong, China |
🔧 Custom bores and keyways available. For keyway options, add “K” after the shaft diameter (e.g., DS-26×26-7Kx8K). Contact us with your specifications.
DS Series – Model Range & Specifications
| Model | Outer Diameter (D) mm | Length (L) mm | Bore Range (d) mm | Rated Torque (N·m) | Max Speed (RPM) | Weight (g) |
|---|---|---|---|---|---|---|
| DS-19×20 | 19 | 20 | 3,4,5,6,6.35,7,8 | 1 | 10000 | 11 |
| DS-26×26 | 26 | 26 | 4,5,6,6.35,7,8,9,9.525,10,11 | 1.5 | 10000 | 28 |
| DS-34×32 | 34 | 32 | 6,6.35,7,8,9,9.525,10,11,12,12.7,14,15 | 3 | 10000 | 55 |
| DS-39×34.5 | 39 | 34.5 | 8,9,9.525,10,11,12,12.7,14,15,16,18,19 | 6 | 10000 | 81 |
| DS-44×34.5 | 44 | 34.5 | 8,9,9.525,10,11,12,12.7,14,15,16,18,19,20,22 | 9 | 10000 | 99 |
| DS-56×45 | 56 | 45 | 12,14,15,16,18,19,20,22,24,25 | 25 | 10000 | 217 |
| DS-68×53 | 68 | 53 | 15,16,19,20,22,24,25,28,30,35 | 60 | 9000 | 348 |
| DS-82×68 | 82 | 68 | 22,24,28,30,35,38,40 | 80 | 8000 | 689 |
📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.
Model Designation – DS Series
DS-□□×□□-□□×□□
| Position | Meaning | Example |
|---|---|---|
| DS | Series code – Single Diaphragm Coupling | DS |
| □□×□□ | Outer Diameter (D) × Length (L) | 26×26 |
| □□×□□ | Inner Diameter 1 (d1) × Inner Diameter 2 (d2) | 7×8 |
Keyway Option: Add “K” after the shaft diameter for keyway.
Example: DS-26×26-7K×8K – both bores with keyways
Product Structure
Two Aluminum Hubs – High-strength aluminum alloy, precision-machined, anodized finish.
Single 304 Stainless Steel Diaphragm – Provides flexibility, misalignment compensation, and excellent fatigue resistance.
Clamping Screw Fastening – Secure shaft fixation with even clamping force.
💡 How it works: The DS coupling consists of two aluminum hubs connected by a single 304 stainless steel diaphragm. Torque is transmitted through the diaphragm, which flexes to accommodate angular and axial misalignment while maintaining high torsional rigidity. The single diaphragm design provides zero backlash operation, which is crucial for precision control in encoders, servo systems, and automated machinery. The diaphragm’s stainless steel construction provides excellent fatigue resistance and long service life.
Single Diaphragm vs Double Diaphragm – Key Differences
| Feature | Single Diaphragm (DS Series) | Double Diaphragm |
|---|---|---|
| Radial misalignment | ❌ Cannot accommodate | ✅ Yes |
| Angular misalignment | ✅ Yes | ✅ Yes |
| Axial misalignment | ✅ Yes | ✅ Yes |
| Torsional rigidity | Higher | Moderate |
| Space requirement | Compact – saves space | Longer (requires center spacer) |
| Best for | Space-limited, high-rigidity, well-aligned applications | Applications requiring full misalignment compensation |
Selection guideline:
Choose single diaphragm (DS) when space is limited, high torsional rigidity is required, and shafts are well-aligned with no significant parallel misalignment.
Choose double diaphragm when parallel misalignment must be accommodated.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Zero Backlash | No rotational clearance – precise positioning for encoders, servo motors, and stepper motors |
| 304 Stainless Steel Diaphragm | Excellent fatigue resistance, corrosion resistance, and long service life |
| High-Strength Aluminum Alloy | Lightweight, low inertia – ideal for high-speed operation up to 10000 RPM |
| High Torsional Rigidity | Maintains system accuracy under load – precise torque transmission |
| Misalignment Compensation | Compensates angular (1°) and axial (±0.09 to ±0.50mm) misalignment |
| Low Inertia | Lightweight design enables high-speed operation and quick starts/stops |
| Clamping Screw Fastening | Even clamping force, no shaft damage – easy installation |
| H7 Precision Bore | High concentricity and accurate shaft fit – reduces vibration |
| Maintenance-Free | No lubrication required – reduces operating costs |
| Vibration Damping | Diaphragm absorbs shock and dampens vibration – protects sensitive components |
| Widely Used Applications | Encoders, instrumentation, lead screws, small pumps, feed rollers, servo motors |
| OEM Customization | Custom bores, keyways, and materials available |
Why Choose a Diaphragm Coupling?
Diaphragm couplings offer several key advantages for precision applications:
Zero Backlash: Essential for encoders, resolvers, and servo motors where accurate position feedback is required.
High Torsional Rigidity: Maintains system accuracy under load – precise torque transmission.
Low Inertia: The lightweight aluminum design makes them ideal for high-speed operation and quick starts/stops.
Maintenance-Free: No lubrication required, reducing downtime and maintenance costs.
Fatigue Resistance: The 304 stainless steel diaphragm provides excellent fatigue resistance for long service life.
Applications
Encoders & Resolvers – Precision position feedback systems
Servo Motors – Precision motion control systems
Stepper Motors – Accurate positioning and step transmission
Lead Screws – Precision linear motion systems
Instrumentation – Precision measuring instruments
Small Pumps – Light-duty pump drives
Feed Rollers – Material handling and feeding systems
CNC Machines – Small CNC machines, engraving machines
Robotics – Small robot joint drives
Automation Equipment – Pick-and-place systems, indexing tables
Why Choose Apex Coupling for DS Series Diaphragm Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Premium Materials | Aluminum alloy hubs + 304 stainless steel diaphragm |
| Zero Backlash | Precision performance for encoders, servo motors, and stepper motors |
| High Torsional Rigidity | Maintains system accuracy under load |
| Low Inertia | High-speed capability – up to 10000 RPM |
| Clamping Screw Fastening | Secure, even clamping force – no shaft damage |
| H7 Precision Bore | High concentricity and accurate shaft fit |
| Maintenance-Free | No lubrication required – reduces operating costs |
| Wide Model Range | DS-19×20 to DS-82×68 – covers most applications |
| OEM Customization | Custom bores, keyways, and materials available |
FAQ
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 is the difference between single and double diaphragm?
A: A single diaphragm coupling provides high torsional rigidity in a compact design but does not allow radial (parallel) misalignment. A double diaphragm coupling can compensate for radial misalignment as well.
Q: What materials are used?
A: The hubs are made of high-strength aluminum alloy. The diaphragm is made of 304 stainless steel – offering excellent fatigue resistance and corrosion resistance.
Q: Does the coupling have backlash?
A: No. The DS series features zero backlash – no rotational clearance, ensuring precise positioning for encoders and servo 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 DS series is maintenance-free – no lubrication required.
Q: What are the common applications?
A: Encoders, resolvers, servo motors, stepper motors, lead screws, instrumentation, small pumps, and feed rollers.
Q: Can the coupling compensate for misalignment?
A: Yes. The single diaphragm design compensates for angular (1°) and axial (±0.09 to ±0.50mm) 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., DS-26×26-7K×8K).
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., DS-26×26), bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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DS series coupling
