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DST / DSTB Single Diaphragm Step‑Type Coupling – Aluminium Alloy Clamp Type, High Torque, Zero Backlash for Servo/Stepper Motors
Model Number
Check below, custom
| Model | Outer Diameter (mm) | Length (mm) | Note |
|---|---|---|---|
| DSTB‑56 | 56 | 45 | – |
| DSTB‑65 | 65 | 55.5 | – |
| DSTB‑87 | 87 | 67 | – |
| DSTB‑94 | 94 | 68 | – |
| DSTB‑104 | 104 | 70 | – |
| DSTB‑126 | 126 | 78 | – |
| – | – | – | Additional sizes available – contact customer service for custom orders |
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DST / DSTB Single Diaphragm Step‑Type Coupling – Aluminium Clamp Type for Servo & Stepper Motors
Factory Direct | High‑Strength Aluminium | 304 Stainless Steel Diaphragm | Zero Backlash | H7 Precision Bore | Low Inertia
Product Overview
The DST / DSTB Single Diaphragm Step‑Type Coupling is a precision power transmission component designed specifically for servo motors, stepper motors, and other high‑precision motion control applications. Featuring a single diaphragm made from 304 stainless steel and high‑strength aluminium alloy hubs, this coupling delivers zero backlash, high torsional rigidity, and low inertia – essential characteristics for accurate positioning and high‑speed operation.
The clamp‑type (split‑hub) mounting ensures a secure, gap‑free shaft connection that maintains concentricity even under reversing loads. With a H7 precision‑ground bore, the DST coupling offers superior alignment accuracy and reliable torque transmission. Its step‑type (stepped) outer profile allows for compact installation in space‑constrained applications, making it the preferred choice for CNC machine tools, automation equipment, robotics, and precision positioning systems.
📧 Get a Quote: ella@apexcoupling.com | WhatsApp/WeChat: +86 13431039760
Key Features
| Feature | Benefit |
|---|---|
| High‑Strength Aluminium Alloy Hubs | Lightweight yet robust – anodised surface provides excellent corrosion resistance for harsh or humid environments |
| 304 Stainless Steel Single Diaphragm | Premium elastic stainless steel diaphragm delivers high torsional rigidity, excellent angular and parallel misalignment compensation, and long‑term fatigue resistance |
| Zero Backlash | Gap‑free connection ensures precise positioning and reliable performance under forward and reverse rotation |
| Clamp‑Type (Split‑Hub) Mounting | Uniform clamping force secures the shaft without marring; easy installation and removal |
| H7 Precision Inner Bore | Ground to H7 tolerance for high concentricity, accurate shaft fitting, and minimal runout |
| Low Inertia | Optimised design minimises rotational inertia, making the coupling ideal for high‑speed and high‑dynamic applications |
| High Torsional Rigidity | Accurate torque transmission with minimal phase lag – critical for closed‑loop servo control |
| Anodised Surface Finish | Standard anodic oxidation treatment enhances corrosion and wear resistance |
| Full Customisation | Custom bores, keyways, hexagon, square, and spline profiles available to meet your specific requirements |
Technical Specifications
| Parameter | Details |
|---|---|
| Model Series | DST (Step‑Type Clamping), DSTB (Enhanced/Heavy‑Duty Version) |
| Hub Material | High‑Strength Aluminium Alloy (e.g., 7075/6061) |
| Surface Treatment | Anodised (Anodic Oxidation) |
| Diaphragm Material | 304 Stainless Steel (Import Grade) |
| Bore Tolerance | H7 Precision Standard |
| Mounting Style | Clamp Type (Split‑Hub with Screws) |
| Backlash | Zero |
| Torsional Rigidity | High – suited for precise positioning and dynamic response |
| Misalignment Compensation | Angular, parallel, and axial (specific values available per model) |
| Product Certification | ISO 9001 Certified |
| Place of Origin | Guangdong, China |
Model Designation & Dimensions
The DST coupling is designated as follows:
DST – OuterDiameter × Length – d1 – d2
Example: DST‑34×27.5‑5‑5
→ Outer diameter = 34 mm, Overall length = 27.5 mm, Bore d1 = 5 mm, Bore d2 = 5 mm.
| Model | Outer Diameter D (mm) | Length L (mm) | Standard Bore Range (mm) |
|---|---|---|---|
| DST‑34 | 34 | 27.5 | 4 – 10 |
| DST‑39 | 39 | 32 | 5 – 14 |
| DST‑44 | 44 | 38 | 6 – 16 |
| DST‑56 | 56 | 45 | 8 – 20 |
| DST‑68 | 68 | 52 | 10 – 25 |
Other sizes available on request. For DSTB (enhanced) series, dimensions may vary – please contact our team.
Custom ordering options (add suffix to bore size):
Add K for keyway (e.g., 10K)
Add F for hexagon bore (e.g., 10F)
Add S for square bore (e.g., 10S)
Add H for spline bore (e.g., 10H)
For other bore profiles, please contact us with your drawing.
Key Advantages at a Glance
High‑Strength Aluminium Alloy – Lightweight with excellent corrosion resistance; anodised for extended life
304 Stainless Steel Diaphragm – Superior elasticity, high torque capacity, and precision flexibility
H7 Precision Bore – Ensures accurate centring and high concentricity
Zero‑Backlash Clamp Connection – Ideal for forward/reverse operation and positioning accuracy
Low Inertia – Suited for high‑speed, dynamic applications
Wide Application Compatibility – Designed specifically for servo and stepper motor interfaces
Applications
The DST/DSTB single diaphragm coupling is widely used in precision motion control environments:
CNC Machine Tools – Milling, turning, and drilling spindle drives
Servo Motor Drives – High‑precision closed‑loop positioning systems
Stepper Motor Applications – 3D printers, engraving machines, labelling equipment
Packaging & Printing Machinery – High‑speed registration and cutting equipment
Semiconductor Equipment – Wafer handling, inspection, and placement systems
Automation & Robotics – Robotic arms, pick‑and‑place units, linear actuators
Medical Equipment – Diagnostic and surgical positioning devices
Photovoltaic / Solar Equipment – Tracking and positioning systems
Woodworking Machinery – Precision routing and carving machines
Why Choose Apexcoupling?
🏭 Factory Direct – Integrated manufacturing and trading, offering competitive prices
🔩 Premium Materials – High‑grade aluminium alloy with anodised finish; 304 stainless steel diaphragm
⚙️ Zero Backlash & Low Inertia – Perfect for servo and stepper motor applications
✅ ISO Certified Quality – Rigorous inspection from raw materials to finished product
🛠️ Full Customisation – Bores, keyways, special profiles, and dimensions – no MOQ for standard variations
📦 Fast Delivery – Standard sizes in stock, ready to ship
💬 Expert Engineering Support – We help you select the optimal coupling for your specific motor and load
Custom & Non‑Standard Orders
Apexcoupling offers extensive customisation for the DST/DSTB series:
Custom bore diameters
Keyway, hexagon, square, and spline profiles
Non‑standard outer diameters and lengths
Alternative materials (e.g., stainless steel hubs)
OEM/ODM with your branding
📧 Send your drawing or requirements to: ella@apexcoupling.com
Get a Quote Today
Ready to order or need more information? Contact us directly:
📧 Email: ella@apexcoupling.com
📱 WhatsApp / WeChat: +86 13431039760
🌐 Website: www.apexcoupling.com
We reply within 24 hours with pricing, availability, and technical recommendations.
DSTB diaphragm couplingaluminium clamp couplingzero backlash servo couplingstepper motor couplingstep‑type diaphragm coupling304 stainless steel diaphragm couplinghigh torque aluminium couplinglow inertia coupling
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