DBL11 Shrink Disc Diaphragm Coupling – 45# Steel, 304SS Disc Pack, Keyless Locking, Zero Backlash

Factory direct | 45# steel hubs | 304 stainless steel disc pack | Keyless shrink disc locking | Zero backlash | High torsional rigidity | Maintenance-free | H7 bore | OEM customizable

The Apexcoupling DBL11 series is a high-performance shrink disc diaphragm coupling engineered for precision power transmission in servo motor, stepper motor, and high-speed CNC applications. Featuring 45# steel hubs with a low-temperature black oxide finish and a 304 stainless steel disc pack, this coupling delivers zero backlash operation, high torsional rigidity, and excellent misalignment compensation. The keyless shrink disc (胀套) locking system provides secure, backlash-free shaft-to-hub connection without the need for keyways – eliminating stress concentrations and simplifying installation. With compact structure, low moment of inertia, and maintenance-free operation, the DBL11 series is the ideal solution for CNC machine tools, food packaging machinery, metallurgical equipment, photovoltaic systems, woodworking machinery, chemical industry, semiconductor equipment, printing machinery, and railway applications.

✅ Zero backlash, high torque rigidity, and keyless shrink disc locking – designed for servo motors, stepper motors, and high-speed precision drives.

Key Technical Specifications

🔧 Custom bores, outer diameters, lengths, and disc configurations available. Contact us with your specifications.

Product Structure

1. Two 45# Steel Hubs – High-strength carbon steel, precision-machined, low-temperature black oxide finish.

2. 304 Stainless Steel Disc Pack – Single or double disc configuration providing flexibility and misalignment compensation.

3. Keyless Shrink Disc (胀套) Locking – Secure, backlash-free shaft-to-hub connection without keyways.

4. H7 Precision Bore – High concentricity, accurate shaft fit.

💡 How it works: The DBL11 shrink disc diaphragm coupling transmits torque through the 304 stainless steel disc pack, which flexes to accommodate angular, axial, and limited radial misalignment. The keyless shrink disc locking system uses tapered rings and clamping screws to create a friction-lock connection between the hub and shaft – eliminating the need for keyways, reducing stress concentrations, and enabling easy installation and removal. The disc pack provides zero backlash operation with identical clockwise and counterclockwise rotation characteristics.

Shrink Disc (胀套) Locking – Keyless Advantage

✅ The shrink disc locking system provides superior performance compared to traditional keyways – eliminating backlash, reducing stress concentrations, and simplifying installation and maintenance.

Product Features & Advantages

Applications

• CNC Machine Tools – Spindle drives, feed axes, high-precision positioning

• Servo Motors – High-precision motion control, zero backlash requirement

• Stepper Motors – Accurate positioning, no lost motion

• Food Packaging Machinery – Hygienic, reliable drives

• Metallurgical Equipment – High-torque, high-speed applications

• Photovoltaic Systems – Solar tracking, precision positioning

• Woodworking Machinery – High-speed, precision drives

• Chemical Industry – Corrosion-resistant applications

• Semiconductor Equipment – Clean room compatible, high precision

• Printing Machinery – Register control, high-speed operation

• Railway Equipment – Durable, reliable power transmission

Why Choose Apex Coupling for DBL11 Shrink Disc Couplings?

FAQ

Q: What is a shrink disc diaphragm coupling?
A: A shrink disc diaphragm coupling (also called a shrink disc coupling or keyless locking coupling) uses a tapered shrink disc (胀套) to create a friction-lock connection between the hub and shaft – eliminating the need for keyways. The 304 stainless steel disc pack transmits torque while compensating for misalignment.

Q: What is the advantage of the shrink disc locking system?
A: The shrink disc locking system provides zero backlash, no keyway stress concentrations, no shaft weakening, easy installation and removal, and reusability – offering superior performance compared to traditional keyways.

Q: What materials are used?
A: The hubs are made of 45# carbon steel with low-temperature black oxide finish. The disc pack is made of 304 stainless steel – offering excellent corrosion resistance and fatigue resistance.

Q: Does the coupling have backlash?
A: No. The DBL11 series features zero backlash – no rotational clearance, ensuring precise positioning for servo and stepper motors.

Q: What misalignment can the coupling compensate for?
A: The disc pack compensates for angular, axial, and limited radial deviations.

Q: What are the rotation characteristics?
A: Clockwise and counterclockwise rotation characteristics are exactly the same.

Q: Is the coupling maintenance-free?
A: Yes. No lubrication required – reduces operating costs and maintenance schedules.

Q: What is the bore tolerance?
A: Standard bore tolerance is H7 for precision shaft fit and high concentricity.

Q: What are the common applications?
A: CNC machine tools, servo motors, stepper motors, food packaging machinery, metallurgical equipment, photovoltaic systems, woodworking machinery, chemical industry, semiconductor equipment, printing machinery, and railway equipment.

Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, outer diameters, lengths, and disc configurations available.

Request a Quote

Send us your bore size, outer diameter, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.