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DFC OD20×L25 Aluminum Jaw Spider Coupling – 2.8N·m Zero Backlash Flexible Shaft Coupler for Servo Motor & Ball Screw
Model Number
Check below, custom
| Outer Diameter (mm) | Length (mm) | Bore Range (mm) |
|---|---|---|
| 14 | 22 | 3 – 7 |
| 20 | 25 | 4 – 10 |
| 20 | 30 | 4 – 10 |
| 25 | 30 | 4 – 12 |
| 25 | 34 | 4 – 12 |
| 30 | 35 | 5 – 16 |
| 30 | 40 | 5 – 16 |
| 35 | 50 | 6 – 19 |
| 40 | 50 | 8 – 24 |
| 40 | 55 | 8 – 24 |
| 40 | 66 | 8 – 24 |
| 45 | 55 | 8 – 25 |
| 45 | 66 | 8 – 25 |
| 55 | 78 | 12 – 30 |
| 65 | 90 | 14 – 40 |
| 80 | 114 | 19 – 45 |
| 95 | 126 | 22 – 55 |
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DFC OD20×L25 Aluminum Jaw Spider Coupling – 2.8N·m Zero Backlash Flexible Shaft Coupler for Servo Motor & Ball Screw
The DFC OD20×L25 aluminum jaw spider coupling is a high-precision, zero-backlash flexible shaft coupler designed for medium-duty servo motors, stepper motors, and ball screw drives. With an outer diameter of 20 mm, overall length of 25 mm, and a robust 2.8 N·m rated torque capacity, this DFC spider coupling bridges larger shaft diameters while maintaining the same aerospace-grade quality and motion control precision.
Machined from high-strength aluminum alloy on 5-axis CNC equipment with H6 bore precision, the DFC OD20 jaw coupling features an anodized oxidation surface for 30% longer service life. The German-imported polyurethane spider absorbs shock, dampens vibration, and compensates for multi-directional misalignment – all while maintaining zero rotary clearance for exact positioning in reversing applications.
Both hubs can be machined with different bore diameters (4 mm – 10 mm range) to connect mismatched shafts, such as a 10 mm servo motor shaft to a 6 mm ball screw end. As a source factory manufacturer, Apexcoupling.com delivers the DFC aluminum flexible coupling with fast customization and global shipping.
DFC OD20×L25 Specifications
| Parameter | Specification |
|---|---|
| Model | DFC (Jaw / Spider Type) |
| Body Material | High-Strength Aluminum Alloy (Aerospace Grade) |
| Spider Material | German-Imported Polyurethane (PU) |
| Surface Treatment | Anodized Oxidation (Anti-Corrosion) |
| Outer Diameter (D) | 20 mm |
| Overall Length (L) | 25 mm |
| Bore Range (d) | 4 mm – 10 mm (Optional, Both Ends) |
| Rated Torque (Tn) | 2.8 N·m |
| Max. Speed | 10,000 RPM |
| Bore Tolerance | H6 Precision |
| Fixing Method | Keyway + Clamping Screw (12.9 Grade) |
| Backlash | Zero |
| Compensation | Radial, Angular, Axial |
| Protection Class | IP65 |
| Standard | ISO Certified |
| Weight | ≈ 25–35 g |
Both ends can have different bore sizes (e.g., 5 mm × 8 mm, 6 mm × 10 mm). Non-standard OD, length, and bore combinations fully supported.
Key Features – DFC OD20×L25 Jaw Spider Coupling
✅ 2.8 N·m Torque – Medium-Duty Servo Ready
With 2.5× the torque capacity of smaller DFC models, the OD20×L25 coupling handles larger servo motors and higher inertial loads without sacrificing precision or compactness.
With 2.5× the torque capacity of smaller DFC models, the OD20×L25 coupling handles larger servo motors and higher inertial loads without sacrificing precision or compactness.
✅ Zero Backlash for Precision Positioning
The tight-fitting polyurethane spider and H6 precision bores ensure zero rotary clearance, making this coupling ideal for CNC machines, robotic arms, and automated positioning systems with frequent direction changes.
The tight-fitting polyurethane spider and H6 precision bores ensure zero rotary clearance, making this coupling ideal for CNC machines, robotic arms, and automated positioning systems with frequent direction changes.
✅ Aerospace-Grade Aluminum Alloy
Machined from high-strength aluminum on 5-axis CNC centers for exceptional concentricity. The anodized surface resists corrosion in humid, oily, or weak chemical environments.
Machined from high-strength aluminum on 5-axis CNC centers for exceptional concentricity. The anodized surface resists corrosion in humid, oily, or weak chemical environments.
✅ German-Imported Polyurethane Spider
The 梅花型 (jaw-type) PU insert delivers superior wear resistance, oil resistance, and electrical insulation. Rated for 140°C continuous operation, it protects connected bearings by absorbing vibration and shock.
The 梅花型 (jaw-type) PU insert delivers superior wear resistance, oil resistance, and electrical insulation. Rated for 140°C continuous operation, it protects connected bearings by absorbing vibration and shock.
✅ H6 Precision Bore – Slip-Free Fit
H6 tolerance machining guarantees a precise shaft interface. 3D chamfered edges (standard on OD20 and above) prevent hand injuries and protect shaft surfaces during assembly.
H6 tolerance machining guarantees a precise shaft interface. 3D chamfered edges (standard on OD20 and above) prevent hand injuries and protect shaft surfaces during assembly.
✅ Multi-Directional Misalignment Compensation
Simultaneously compensates for radial, angular, and axial shaft deviations, reducing stress on motor bearings and extending the life of precision gearboxes and ball screws.
Simultaneously compensates for radial, angular, and axial shaft deviations, reducing stress on motor bearings and extending the life of precision gearboxes and ball screws.
✅ Bi-Directional Rotation – Identical Torsional Stiffness
Performs equally in forward and reverse with no hysteresis or wind-up, ensuring consistent motion control in servo-driven indexing and pick-and-place applications.
Performs equally in forward and reverse with no hysteresis or wind-up, ensuring consistent motion control in servo-driven indexing and pick-and-place applications.
✅ Split Clamping Design – Tool-Free Installation
The 12.9-grade clamping screws allow quick mounting and removal without disassembling adjacent motor or screw components. Simply slide on and tighten.
The 12.9-grade clamping screws allow quick mounting and removal without disassembling adjacent motor or screw components. Simply slide on and tighten.
✅ Mixed Bore Customization
Connect shafts of different diameters in one coupling. Popular combinations include 6 mm × 8 mm, 5 mm × 10 mm, and 8 mm × 10 mm. Provide your exact sizes for custom machining.
Connect shafts of different diameters in one coupling. Popular combinations include 6 mm × 8 mm, 5 mm × 10 mm, and 8 mm × 10 mm. Provide your exact sizes for custom machining.
Material & Manufacturing Excellence
| Component | Material / Process | Advantage |
|---|---|---|
| Hub Body | High-strength aluminum alloy, 5-axis CNC machined | Lightweight, high rigidity, perfect concentricity |
| Surface Finish | Anodized oxidation | 30% longer life, superior corrosion & scratch resistance |
| Spider (Jaw Insert) | German-imported polyurethane (PU) | 140°C rated, oil-resistant, excellent vibration damping |
| Bore Machining | H6 precision, single-setup turning | Zero backlash, smooth shaft engagement |
| Fixing Screws | 12.9 grade alloy steel | High clamping force, vibration-resistant |
| Edge Treatment | 3D chamfer standard | Safe handling, no sharp burrs |
Every DFC OD20 jaw coupling undergoes 100% dimensional inspection – bore diameter, concentricity, surface roughness, and spider hardness – ensuring ISO-compliant quality before shipment.
Applications – Precision Motion Control
The DFC OD20×L25 spider coupling is ideal for medium-duty precision motion systems:
- ⚙️ Servo Motors – Servo-to-ball screw, servo-to-planetary gearbox connections
- 🔩 Ball Screw Drives – CNC milling machines, lathes, 3D printers, linear stages
- 🤖 Automation & Robotics – Robotic joints, linear actuators, gantry systems
- 📐 Stepper Motor Drives – Laser cutters, engraving machines, PCB plotters
- 🏭 Packaging Machinery – Cartoning, filling, sealing, and labeling lines
- 🔬 Medical & Lab Equipment – Precision liquid handlers, diagnostic instruments
- 📦 Textile & Printing – High-speed roller drives, spindle connections
How to Select the Right DFC Coupling
Step 1: Confirm Installation Space
Choose the outer diameter (D) and length (L) that fit your mechanical envelope.
Example: OD20 mm × L25 mm for compact yet medium-torque servo applications.
Choose the outer diameter (D) and length (L) that fit your mechanical envelope.
Example: OD20 mm × L25 mm for compact yet medium-torque servo applications.
Step 2: Verify Bore Range
Ensure both shaft diameters fall within the available bore range.
Example: OD20×L25 supports bores from 4 mm to 10 mm on either end.
Ensure both shaft diameters fall within the available bore range.
Example: OD20×L25 supports bores from 4 mm to 10 mm on either end.
Step 3: Specify Different Bores (if needed)
Note each hub bore when ordering.
Example: “Bore 6 mm × 10 mm” or “5 mm × 8 mm”.
Note each hub bore when ordering.
Example: “Bore 6 mm × 10 mm” or “5 mm × 8 mm”.
Step 4: Check Torque & Speed
Confirm your peak torque and max RPM are within the coupling rating.
Example: 2.8 N·m torque, 10,000 RPM max for OD20×L25.
Confirm your peak torque and max RPM are within the coupling rating.
Example: 2.8 N·m torque, 10,000 RPM max for OD20×L25.
Need help? Send us your motor model, shaft diameters, and application – we recommend the exact size within 24 hours.
Customization Process – How to Order
| Step | Process | Description |
|---|---|---|
| 01 | Custom Inquiry | Contact us with your coupling requirements |
| 02 | Requirement Review | We review bore sizes, torque, speed, and environment |
| 03 | Quotation | Competitive factory-direct pricing delivered |
| 04 | Order & Payment | Confirm order and complete payment |
| 05 | Sample Confirmation | First article inspection for custom dimensions |
| 06 | Batch Production | CNC machining with strict quality control |
| 07 | Delivery | Export packaging and punctual global shipping |
| 08 | Feedback | Post-delivery support and satisfaction follow-up |
For custom orders, please provide:
- Shaft diameters for both ends (can be different)
- Required outer diameter and overall length
- Application torque and max RPM
- Operating environment (temperature, oil, dust exposure)
- Target quantity and delivery schedule
Why Choose Apexcoupling.com?
| Advantage | Detail |
|---|---|
| 🏭 Source Factory | Direct manufacturer of precision couplings and power transmission components |
| ⚙️ 5-Axis CNC Machining | Single-setup production ensures perfect concentricity and H6 bore precision |
| 📦 Large Inventory | Standard DFC sizes in stock for immediate dispatch |
| 🔧 Full Customization | Non-standard OD, length, bore combinations, and special materials available |
| 🧪 Strict Quality Control | 100% dimensional inspection, ISO-certified processes |
| 🌐 Global Export | Professional packaging with full documentation |
| 💰 Competitive Pricing | Factory-direct pricing with volume discounts |
| 🚀 Fast Response | Technical support and quotations within 24 hours |
📞 Request Your DFC OD20×L25 Quote Today
In Stock: DFC OD14×L22, DFC OD20×L25, DFC OD25×L30, DFC OD30×L35, DFC OD40×L50, and complete DFC series
Whether you need a standard DFC aluminum jaw spider coupling or a fully customized precision shaft coupler, Apexcoupling.com delivers high-quality motion control solutions with fast global delivery.
👉 [Request a Quote / Send Inquiry]
📧 Email: ella@apexcoupling.com
📱 WhatsApp: +86 13437856962
🌐 Website: www.apexcoupling.com
📧 Email: ella@apexcoupling.com
📱 WhatsApp: +86 13437856962
🌐 Website: www.apexcoupling.com
FAQ – DFC OD20×L25 Aluminum Jaw Spider Coupling
Q1: What is the torque and speed rating of the DFC OD20×L25 coupling?
A: The DFC OD20×L25 has a rated torque of 2.8 N·m and a maximum speed of 10,000 RPM. It is ideal for medium-duty servo motors, stepper drives, and ball screw applications.
A: The DFC OD20×L25 has a rated torque of 2.8 N·m and a maximum speed of 10,000 RPM. It is ideal for medium-duty servo motors, stepper drives, and ball screw applications.
Q2: What bore sizes are available for the OD20×L25 model?
A: This model supports bore diameters from 4 mm to 10 mm on either hub. Both ends can be the same or different (e.g., 6 mm × 10 mm).
A: This model supports bore diameters from 4 mm to 10 mm on either hub. Both ends can be the same or different (e.g., 6 mm × 10 mm).
Q3: Can this coupling connect a servo motor to a ball screw with different shaft sizes?
A: Yes. The DFC jaw coupling is specifically designed to accommodate different bore sizes on each end, making it perfect for connecting mismatched shafts like a 10 mm servo motor to an 8 mm ball screw.
A: Yes. The DFC jaw coupling is specifically designed to accommodate different bore sizes on each end, making it perfect for connecting mismatched shafts like a 10 mm servo motor to an 8 mm ball screw.
Q4: What makes the DFC coupling better than set-screw or rigid couplings for servo motors?
A: Unlike rigid couplings, the DFC spider coupling compensates for misalignment and absorbs vibration. Unlike set-screw couplings, it offers zero backlash and H6 precision bores – both essential for accurate servo positioning.
A: Unlike rigid couplings, the DFC spider coupling compensates for misalignment and absorbs vibration. Unlike set-screw couplings, it offers zero backlash and H6 precision bores – both essential for accurate servo positioning.
Q5: What is the maximum operating temperature?
A: The German-imported polyurethane spider is rated for continuous operation up to 140°C. The anodized aluminum hub performs well beyond this range.
A: The German-imported polyurethane spider is rated for continuous operation up to 140°C. The anodized aluminum hub performs well beyond this range.
Q6: How do I install the DFC coupling without damaging the spider?
A: Slide both hubs onto their respective shafts, insert the PU spider into the jaw grooves, align the hubs, and tighten the 12.9-grade clamping screws evenly. Do not over-tighten.
A: Slide both hubs onto their respective shafts, insert the PU spider into the jaw grooves, align the hubs, and tighten the 12.9-grade clamping screws evenly. Do not over-tighten.
Q7: Do you offer larger DFC sizes for heavier industrial loads?
A: Yes. The DFC series spans from OD14 mm to OD65 mm and beyond, with torque capacities reaching hundreds of N·m. Contact us with your specifications for size recommendations.
A: Yes. The DFC series spans from OD14 mm to OD65 mm and beyond, with torque capacities reaching hundreds of N·m. Contact us with your specifications for size recommendations.
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CNC servo coupling, automation drive connector, stepper motor coupler, precision machinery coupling, robotics shaft joint
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