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DNC Series 45# Steel Rigid Clamping Coupling – High Torque, Zero Backlash for Servo Motors
Model Number
Check below, custom
D16-L16-bore(4~6.35)
D16-L22-bore(4~6.35)
D20-L20-bore(4~10)
D20-L24-bore(4~10)
D25-L25-bore(5~12)
D25-L36-bore(5~12)
D32-L32-bore(6~16)
D32-L40-bore(6~16)
D40-L44-bore(8~20)
D50-L55-bore(10~25)
D68-L54-bore(15~35)
D68-L90-bore(15~35)
D82-L68-bore(19~45)
D82-L110-bore(19~45)
D95-L126-bore(22~60)
D105-L140-bore(30~60)
D120-L160-bore(35~70)
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DNC Series 45# Steel Rigid Clamping Coupling – High Torque, Zero Backlash for Servo Motors
Factory direct | 45# high-strength steel | Integrated structure | Zero backlash | High torque 2000 N·m | 5000 RPM | Clamping screw fastening | High rigidity | Long service life | OEM customizable
The Apexcoupling DNC series is a high-performance rigid clamping coupling engineered for precision power transmission in servo motor, stepper motor, and high-precision positioning applications. Constructed from 45# high-strength steel with an integrated one-piece structure, this coupling delivers exceptional torque capacity, ultra-high torsional rigidity, and zero backlash operation. The clamping screw fastening method provides secure, even shaft clamping without damaging the shaft surface. The rigid design ensures perfect shaft alignment with no rotational clearance – making it the ideal choice for applications where absolute precision and high torque transmission are required.
⚠️ Important: Rigid couplings do not accommodate any misalignment (radial, angular, or axial). The shafts must be perfectly aligned during installation to prevent bearing damage or shaft failure.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | DNC (Rigid Clamping Coupling) |
| Type | Rigid / Clamping |
| Structure | Integrated one-piece construction |
| Material | 45# high-strength carbon steel |
| Surface Treatment | Black oxide (standard) |
| Fastening Method | Clamping screw |
| Bore Diameter | 30 mm (standard) – custom available |
| Rated Torque | 2000 N·m |
| Maximum Speed | 5000 RPM |
| Backlash | Zero – no rotational clearance |
| Torsional Rigidity | Ultra-high – no angular deflection under load |
| Allowable Misalignment | None – 0 mm radial, 0° angular, 0 mm axial |
| Feature | High torque, high rigidity, high accuracy, high durability |
| Customized support | OEM |
| Applicable Industries | Retail, manufacturing, automation, servo motor drives |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, outer diameters, lengths, and keyways available. Contact us with your specifications.
Product Structure
Integrated One-Piece Body – 45# high-strength steel, precision-machined as a single unit for maximum rigidity.
Clamping Screws – Radial clamping screws provide secure, even shaft fastening without damaging the shaft surface.
Smooth Bore – Precision-machined bore protects shafts from damage.
💡 How it works: The DNC rigid coupling is a one-piece clamping-type coupling that creates a solid, backlash-free connection between two perfectly aligned shafts. The clamping screws are tightened evenly to secure the coupling to both shafts, creating a single rigid unit that transmits torque with zero lost motion. Unlike flexible couplings, rigid couplings have no element to absorb misalignment – they rely on perfect shaft alignment for proper operation.
Rigid Coupling vs Flexible Coupling – Key Differences
| Feature | Rigid Coupling (DNC) | Flexible Coupling |
|---|---|---|
| Backlash | Zero – no rotational clearance | Zero (some types) |
| Torsional rigidity | Ultra-high | Moderate to high |
| Misalignment compensation | None – shafts must be perfectly aligned | Angular, radial, axial |
| Torque capacity | Very high | Moderate to high |
| Speed capability | High | High |
| Shaft connection | Two shafts function as one | Flexible connection |
| Best for | Perfectly aligned shafts, high precision, high torque | Applications with misalignment, vibration damping |
✅ When to choose a rigid coupling: When shafts are perfectly aligned, when zero backlash is critical, when maximum torque transmission is required, and when high torsional rigidity is needed for precise positioning.
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| 45# High-Strength Steel | Excellent strength, wear resistance, and durability – withstands high torque and heavy loads |
| Integrated One-Piece Structure | Maximum rigidity – no moving parts, no wear, long service life |
| Zero Backlash | No rotational clearance – precise positioning for servo and stepper motors |
| High Torsional Rigidity | No angular deflection under load – maintains system accuracy |
| High Torque Capacity | 2000 N·m – handles demanding servo motor applications |
| Clamping Screw Fastening | Even clamping force – no shaft damage, superior to set-screw types |
| Smooth Bore | Non-marring – protects shafts from damage |
| Black Oxide Finish | Corrosion-resistant and professional appearance |
| Compact Design | High torque at compact size |
| Long Service Life | No wear parts – maintenance-free operation |
| OEM Customization | Custom bores, outer diameters, lengths, and keyways available |
Why Rigid Couplings Are Ideal for Servo Motors
Rigid couplings are specifically designed for servo motor applications requiring ultra-high precision and zero backlash:
| Requirement | How Rigid Coupling Meets It |
|---|---|
| Zero backlash | No rotational clearance – precise positioning |
| High torsional rigidity | No angular deflection – accurate torque transmission |
| High torque capacity | 2000 N·m – handles demanding servo drives |
| High accuracy | Perfect shaft alignment – precise motion control |
| High durability | No wear parts – long service life |
✅ The DNC series is specifically designed for servo motors and stepper motors – providing the ultra-high rigidity, zero backlash, and high torque capacity required for demanding motion control applications.
Applications
Servo Motors – High-precision motion control, zero backlash requirement
Stepper Motors – Accurate positioning, no lost motion
CNC Machine Tools – Spindle drives, feed axes, high-precision positioning
Robotics – Joint drives, precision motion
Packaging Machinery – Registration and indexing systems
Printing Equipment – Register control, high-speed operation
Automation Equipment – Pick-and-place systems, indexing tables
Precision Positioning Systems – XY tables, linear stages
Retail Equipment – Display and handling systems
Important Installation Note – Perfect Alignment Required
⚠️ Rigid couplings do NOT accommodate any misalignment. The shafts must be perfectly aligned during installation.
| Misalignment Type | Allowable Tolerance |
|---|---|
| Radial (eccentricity) | 0 mm – must be fully adjusted |
| Angular | 0° – shafts must be collinear |
| Axial | 0 mm – no end play allowed |
💡 Installation tip: Use a dial indicator or laser alignment tool to ensure perfect shaft alignment before tightening the clamping screws. Improper alignment will cause premature bearing failure and shaft damage.
Why Choose Apex Coupling for DNC Rigid Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Premium 45# Steel | High strength, durability, and wear resistance |
| Integrated One-Piece Structure | Maximum rigidity – no wear parts |
| Zero Backlash | Accurate position feedback – no lost motion |
| High Torque & High Speed | 2000 N·m torque, 5000 RPM – handles demanding applications |
| Clamping Screw Fastening | Even clamping force – no shaft damage |
| OEM Customization | Custom bores, outer diameters, lengths, and keyways available |
| Long Service Life | Maintenance-free – no wear parts |
FAQ
Q: What is a rigid clamping coupling?
A: A rigid clamping coupling is a one-piece coupling that creates a solid, backlash-free connection between two perfectly aligned shafts. It uses clamping screws to secure the coupling to both shafts, transmitting torque with zero lost motion.
Q: What materials are used?
A: The DNC series is manufactured from 45# high-strength carbon steel with a black oxide finish for corrosion resistance.
Q: What is the torque and speed rating?
A: Rated torque is 2000 N·m and maximum speed is 5000 RPM.
Q: Does the coupling have backlash?
A: No. The DNC series features zero backlash – no rotational clearance, ensuring precise positioning for servo and stepper motors.
Q: Can the coupling compensate for misalignment?
A: No. Rigid couplings do not accommodate any misalignment (radial, angular, or axial). The shafts must be perfectly aligned during installation.
Q: What is the advantage of the clamping screw design?
A: The clamping screw design provides even clamping force around the shaft – preventing shaft damage and ensuring secure torque transmission. It is superior to set-screw types.
Q: Is the coupling maintenance-free?
A: Yes. The integrated one-piece structure has no moving parts or wear items – maintenance-free operation.
Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, outer diameters, lengths, and keyways available.
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.
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