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DRZ Stainless Steel Bellows Coupling with Shrink Disc – Zero Backlash, Laser Welded, for CNC Machines
Model Number
Check below, custom
DRZ
- Phone : +86 13431039760
- Wechat : +86 13431039760
- Whatsapp : +86 13431039760
- Email : ella@apexcoupling.com
Product Description
DRZ Stainless Steel Bellows Coupling with Shrink Disc – Zero Backlash, Laser Welded, for CNC Machines
Factory direct | Full stainless steel construction | Laser welded | Zero backlash | Shrink disc connection | Designed for CNC machine tools
The Apexcoupling DRZ series is a stainless steel bellows coupling with integrated shrink disc (shrink disc / locking assembly) designed for precision power transmission in demanding applications. Featuring zero rotational clearance, it is ideal for applications requiring positive and negative rotation with absolute precision. The bellows and shaft hubs are joined by laser welding, ensuring superior strength and straightness. The shrink disc connection provides a secure, backlash-free shaft-to-hub attachment.
✅ Specifically designed for CNC machine tool drives – ensures high positioning accuracy and reliable performance.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | Apexcoupling |
| Model Series | DRZ (Stainless Steel Bellows Coupling with Shrink Disc) |
| Type | Flexible / Metal Bellows / Shrink Disc |
| Material | Full stainless steel construction (bellows + hubs) |
| Joining Method | Laser welding between bellows and hubs |
| Backlash | Zero (zero rotational clearance) |
| Misalignment Compensation | Radial, angular, and axial deviations |
| Connection Type | Shrink disc (胀套) – secure shaft-to-hub locking |
| Shaft Fixing | Clamping via shrink disc |
| Bore Tolerance | H7 (standard) |
| Surface Treatment | Polished |
| Customization | Keyways available (add “K” to model number) |
| Operating Temperature | -30°C to 120°C (typical for stainless steel bellows) |
| Applicable Industries | CNC machine tools, machining centers, engraving machines, CNC milling, metallurgy, mining, petroleum, chemical, hoisting, transportation, light industry, textile, pumps |
| Certification | ISO9001, BV Certificate |
| Warranty | 1 Year |
| Place of Origin | Guangdong, China |
🔧 Custom bores, keyways, and special materials available. Large semi-finished stock for fast delivery. Contact us with your specifications.
Model Designation
DRZ – □□ x □□ – □□ x □□
| Position | Meaning |
|---|---|
| DRZ | Series code |
| □□ x □□ | Outer diameter x Length |
| □□ x □□ | d1 (shaft diameter 1) x d2 (shaft diameter 2) |
Keyway Option: Add “K” after the shaft diameter for keyway.
Example: DRZ-55×75-10k x 11k – both bores with keyways
Product Features & Advantages
| Advantage | Benefit |
|---|---|
| Full Stainless Steel Construction | Excellent corrosion resistance – suitable for harsh environments, clean rooms, and outdoor applications |
| Laser Welded Bellows | Superior strength, perfect straightness, and reliable zero backlash performance |
| Zero Rotational Clearance | No backlash – ideal for positive and negative rotation, servo motors, and precision positioning |
| Shrink Disc Connection | Secure, backlash-free shaft-to-hub locking; easy installation and removal |
| Misalignment Compensation | Compensates for radial, angular, and axial deviations – protects bearings and seals |
| Designed for CNC Machines | Specifically engineered for CNC machine tool drives – high precision and reliability |
| High Torsional Stiffness | Minimal angular displacement under load – maintains positioning accuracy |
| H7 Bore Precision | High concentricity, accurate shaft fit |
| Keyway Option | Custom keyways available for high-torque applications |
| Large Semi-Finished Stock | Fast delivery for standard and custom orders |
Product Structure
Two Stainless Steel Hubs – Precision-machined, corrosion-resistant stainless steel.
Stainless Steel Bellows – Thin-walled corrugated structure providing flexibility and misalignment compensation.
Laser Welded Joints – Bellows laser welded to hubs for superior strength and straightness.
Shrink Disc (Locking Assembly) – Integrated shrink disc for secure, backlash-free shaft connection.
💡 The bellows structure provides high flexibility with low restoring forces, while the shrink disc ensures a secure, zero-backlash connection to the shaft.
Technical Data
| Parameter | Value |
|---|---|
| Material | Full stainless steel |
| Joining Method | Laser welding |
| Backlash | Zero |
| Bore Tolerance | H7 |
| Connection Type | Shrink disc |
| Surface Treatment | Polished |
| Operating Temperature | -30°C ~ 120°C |
Applications
CNC Machine Tools – Spindle drives, feed axes, high-precision positioning
Machining Centers – High-speed, high-accuracy drives
Engraving Machines – Precision motion control
CNC Milling Machines – Reliable power transmission
Servo Motors & Stepper Motors – Zero backlash for precise positioning
Metallurgical Equipment – Durable, corrosion-resistant connections
Mining Machinery – Harsh environment compatibility
Petroleum & Chemical Equipment – Corrosion resistance
Hoisting & Transportation Equipment – Reliable power transmission
Light Industry & Textile Machinery – Precision and durability
Pumps – Smooth, reliable operation
Why Choose Apex Coupling for DRZ Bellows Couplings?
| Advantage | Description |
|---|---|
| Factory Direct | Competitive B2B pricing – no middlemen |
| Full Stainless Steel | Excellent corrosion resistance – suitable for demanding environments |
| Laser Welded Construction | Superior strength, straightness, and zero backlash performance |
| Shrink Disc Connection | Secure, backlash-free shaft locking; easy installation |
| Zero Backlash Design | Precision performance for reversible and servo applications |
| Misalignment Compensation | Protects bearings and seals from radial, angular, and axial deviations |
| Designed for CNC | Specifically engineered for CNC machine tool drives |
| Customization | Bores, keyways, and special materials – all customizable |
| Large Semi-Finished Stock | Fast delivery for standard and custom orders |
| ISO9001 & BV Certified | Quality assured for international buyers |
FAQ
Q: What is a bellows coupling with shrink disc?
A: It is a flexible coupling that uses a thin-walled stainless steel bellows to transmit torque while compensating for misalignment. The shrink disc (shrink disc) provides a secure, backlash-free connection between the coupling hub and the shaft.
Q: What does “zero backlash” mean?
A: Zero backlash means there is no rotational clearance between the coupling and the shaft. This ensures precise torque transmission with no lost motion – critical for CNC machines, servo motors, and precision positioning.
Q: Why is laser welding used?
A: Laser welding provides superior strength, perfect straightness, and reliable zero backlash performance. It ensures the bellows and hubs are joined with high precision.
Q: What materials are used?
A: The DRZ series features full stainless steel construction – both the bellows and hubs are made of stainless steel for excellent corrosion resistance.
Q: What misalignment can the coupling compensate for?
A: The bellows structure compensates for radial, angular, and axial deviations.
Q: What is the bore tolerance?
A: Standard bore tolerance is H7 for precision shaft fit and high concentricity.
Q: Can I get a keyway?
A: Yes. Add “K” to the model number (e.g., DRZ-55×75-10k x 11k) to specify keyways on both bores.
Q: What is the shrink disc connection?
A: The shrink disc (shrink disc / locking assembly) provides a secure, backlash-free connection between the coupling hub and the shaft. It allows for easy installation and removal.
Q: What are the main applications?
A: CNC machine tools, machining centers, engraving machines, servo motors, stepper motors, metallurgical equipment, mining machinery, and more.
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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