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DB Series Aluminum Alloy 8-Shaped Encoder Coupling – High Flexibility, Zero Backlash, Polyurethane Elastomer
Model Number
Check below, custom
D15-L24-d(3~8)
D15-L31-d(3~8)
D18-L28-d(4~10)
D18-L38-d(4-10)
D25-L45-d(6~15)
D25-L56-d(6~15)
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DB Series Aluminum Alloy 8-Shaped Encoder Coupling – High Flexibility, Zero Backlash, Polyurethane Elastomer
Factory direct | High-strength aluminum alloy | 8-shaped flexible design | Zero backlash | PU elastomer | Oil & oxidation resistant | Clamping screw design | OEM customizable
The Apexcoupling DB series is a specialized 8-shaped encoder coupling designed for precision motion control applications. Featuring high-strength aluminum alloy hubs and a polyurethane (PU) elastomer insert, this coupling delivers excellent flexibility, zero backlash, and superior durability. The unique 8-shaped geometry provides good flexibility while maintaining torsional stiffness, making it ideal for encoders, servo motors, stepper motors, and positioning systems. The PU elastomer is resistant to oil and oxidation, ensuring long service life in demanding industrial environments.
✅ Specifically designed for encoder applications – zero backlash for precise position feedback. Good flexibility – not easy to break.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | DB (8-Shaped Encoder Coupling) |
| Type | Flexible / Elastomeric / 8-Shaped |
| Hub Material | High-strength aluminum alloy |
| Elastomer Material | Polyurethane (PU) – oil-resistant, oxidation-resistant |
| Surface Treatment | Anodized (clear anodize) |
| Fastening Method | Clamping screw (set screw) |
| Outer Diameter | 15 mm – 25 mm |
| Length | 24 mm – 56 mm |
| Bore Diameter | 3 mm – 15 mm |
| Rated Torque | 300 N·m |
| Maximum Speed | 1000 RPM |
| Backlash | Zero (no rotational clearance) |
| Misalignment Compensation | Angular, parallel (eccentricity), and axial |
| Keyway Option | Available (custom – add “K” to model number) |
| Customized support | OEM |
| Applicable Industries | Machinery repair shops, farms, home use, retail, 3D printers, linear screw modules, encoders, power transmission, motors |
| Certification | ISO, BV & RoHS |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, and special sizes available. Contact us with your specifications.
Model Designation
DB – □□ × □□ – □□ × □□
| Position | Meaning |
|---|---|
| DB | Series code (8-Shaped Encoder Coupling) |
| □□ × □□ | Outer Diameter × Length |
| □□ × □□ | d1 (shaft diameter 1) × d2 (shaft diameter 2) |
Keyway Option: Add “K” after the shaft diameter for keyway.
Example: DB-15×24-8K×8K – both bores with keyways
Product Structure
Two Aluminum Hubs – High-strength aluminum alloy, precision-machined with an 8-shaped flexible section, anodized finish.
Polyurethane (PU) Elastomer – Integrated elastomer element providing flexibility, vibration damping, and misalignment compensation.
Clamping Screws – Secure shaft fastening with set screws.
💡 The 8-shaped geometry is specifically designed to provide good flexibility for encoder applications while maintaining torsional rigidity. The design allows the coupling to absorb parallel, angular misalignment, and shaft end-play.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| 8-Shaped Flexible Design | Provides good flexibility while maintaining torsional stiffness – ideal for encoder applications |
| High-Strength Aluminum Alloy | Lightweight, corrosion-resistant, high strength-to-weight ratio – reduces inertia for faster response |
| Polyurethane Elastomer | Oil-resistant, oxidation-resistant, durable – long service life in demanding environments |
| Zero Backlash | No rotational clearance – precise position feedback for encoders and servo systems |
| Misalignment Compensation | Absorbs parallel, angular misalignment, and shaft end-play – protects bearings and seals |
| Good Flexibility | Not easy to break – reliable operation under dynamic loads |
| Clamping Screw Fastening | Secure shaft locking, easy installation and adjustment |
| Compact Design | Small outer diameter (15–25mm) – saves space in tight installations |
| Anodized Finish | Enhanced corrosion resistance and wear resistance |
| OEM Customization | Custom bores, keyways, and special sizes available |
| ISO, BV & RoHS Certified | Quality assured for international buyers |
Applications
Encoders – Precise position feedback, zero backlash requirement
Servo Motors – High-precision motion control
Stepper Motors – Accurate step transmission, no lost motion
3D Printers – Lightweight, precise shaft connections
Linear Screw Modules – Precision linear motion systems
CNC Machine Tools – Positioning systems, ball screws
Robotics – Precise motion control
Packaging Machinery – Reliable, maintenance-friendly drives
Printing Equipment – Register control, high-speed operation
General Industrial Machinery – Light to medium-duty power transmission
Why Choose Apex Coupling for DB Encoder Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Specialized 8-Shaped Design | Optimized for encoder applications – good flexibility, not easy to break |
| Premium Materials | High-strength aluminum alloy + PU elastomer |
| Zero Backlash | Precision performance for encoders and servo systems |
| Misalignment Compensation | Protects bearings and seals from misalignment damage |
| Compact & Lightweight | Low inertia – ideal for high-speed applications |
| OEM Customization | Custom bores, keyways, and special sizes available |
| ISO, BV & RoHS Certified | Quality assured for international buyers |
FAQ
Q: What is an 8-shaped encoder coupling?
A: An 8-shaped encoder coupling is a specialized flexible coupling designed specifically for encoder applications. The 8-shaped geometry provides good flexibility while maintaining torsional stiffness, making it ideal for connecting motors to encoders.
Q: What is the advantage of the 8-shaped design?
A: The 8-shaped design provides good flexibility and is not easy to break, making it ideal for dynamic encoder applications where misalignment and vibration are present.
Q: What materials are used?
A: The hubs are made of high-strength aluminum alloy and the elastomer is made of polyurethane (PU) – resistant to oil and oxidation.
Q: Does the coupling have backlash?
A: No. The DB series features zero backlash – no rotational clearance, ensuring precise position feedback for encoders.
Q: What misalignment can the coupling compensate for?
A: The coupling absorbs parallel misalignment, angular misalignment, and shaft end-play.
Q: What is the torque and speed rating?
A: Rated torque is 300 N·m and maximum speed is 1000 RPM.
Q: What is the bore range?
A: Bore diameters range from 3 mm to 15 mm. Custom sizes available on request.
Q: Can I get a keyway?
A: Yes. Add “K” to the model number (e.g., DB-15×24-8K×8K) to specify keyways on both bores.
Q: Is the coupling easy to install?
A: Yes. The clamping screw design allows for easy installation and adjustment.
Q: What certifications does the coupling have?
A: The DB series is ISO, BV & RoHS certified – quality assured for international buyers.
Request a Quote
Send us your outer diameter, length, shaft diameters, and any keyway requirements. Our engineers will recommend the optimal model and provide a quotation within 24 hours.
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DB encoder coupling
