Aluminum Double Diaphragm Shaft Coupling – High Precision Single & Double Disc Diaphragm Coupling for Servo & Stepper Motors

Apex Coupling manufactures high precision double diaphragm shaft coupling and single disc diaphragm couplings for servo motors, stepper motors, CNC machines, automation equipment and industrial drive systems. The DLF series uses a high-strength aluminum alloy body and 304 stainless steel diaphragm discs to deliver zero backlash, low inertia, high torsional rigidity and accurate rotational control.

If you are looking for a reliable double diaphragm shaft coupling manufacturer with OEM, ODM and OBM support, this aluminum alloy flexible disc coupling is designed for high-precision motion control and positive/negative rotation applications.

What Is the DLF Aluminum Alloy Double Diaphragm Shaft Coupling?

The DLF series is a high-sensitivity double diaphragm clamping coupling. It combines a lightweight aluminum alloy shaft sleeve with stainless steel diaphragm discs. The result is a flexible shaft coupling with zero backlash, low inertia and high torque rigidity. It is especially suitable for servo and stepper motor systems where precise shaft rotation and repeatable positioning are critical.

This coupling can be supplied as a single disc or double disc diaphragm design. The double diaphragm version offers greater misalignment compensation and is widely used in automation, packaging, printing, food machinery, robotics and precision manufacturing.

Key Features of Our Double Diaphragm Shaft Coupling

• High-strength aluminum alloy body – lightweight, low inertia and suitable for high-speed operation.
• 304 stainless steel diaphragm discs – durable, corrosion-resistant and maintenance-free.
• Zero backlash – no clearance between shaft and shaft sleeve, ideal for positive and negative rotation.
• High torque rigidity – accurately controls shaft rotation for high-precision motion control.
• Designed for servo and stepper motors – low inertia and fast response.
• Clamping screw fastening – secure connection; keyway is available on request.
• Single and double disc options – choose the best configuration for your application.
• OEM, ODM and OBM support – custom bore, keyway, torque, speed and marking available.

Technical Specifications

Torque, speed and bore values depend on model and configuration. Please send us your drawing or application data for exact selection.

Applications of Aluminum Double Diaphragm Shaft Coupling

• Servo motor and stepper motor drive systems
• CNC machines and precision automation
• Packaging machinery and printing equipment
• Food and beverage processing machinery
• Robotics and semiconductor equipment
• Medical and laboratory instruments
• Machinery repair shops and manufacturing plants
• Energy, mining and construction equipment

Single Disc vs Double Disc Diaphragm Coupling

A single disc diaphragm coupling is compact and suitable for applications with limited misalignment. A double diaphragm shaft coupling uses two diaphragm packs, allowing better compensation for angular, radial and axial misalignment. It also provides higher torsional rigidity and is preferred for servo systems that require accurate positioning and zero backlash.

If your application involves high-speed rotation, frequent forward/reverse motion or precise servo control, the double disc diaphragm coupling is usually the better choice.

Why Choose Apex Coupling as Your Double Diaphragm Shaft Coupling Manufacturer?

• Factory direct supply – competitive pricing for distributors and OEM buyers.
• Custom manufacturing – bore size, keyway, clamping type, material and marking.
• Strict quality control – ISO9001 and BV certificate.
• Fast response – engineering support for selection and drawing confirmation.
• One-year warranty – reliable after-sales support.
• OEM, ODM, OBM service – your brand, your packaging, your specifications.

Installation Notes for Double Diaphragm Shaft Coupling

1. Clean the shaft and bore before installation.
2. Check bore fit and keyway dimensions if applicable.
3. Align the shafts carefully before tightening the clamping screws.
4. Tighten the clamping screws evenly and according to the recommended torque.
5. Rotate the shaft by hand to confirm there is no binding or abnormal contact.
6. For high-speed applications, ensure the coupling is properly balanced.

FAQ – Double Diaphragm Shaft Coupling

1. Is this a double diaphragm shaft coupling?

Yes. The DLF series can be supplied as a single disc or double disc diaphragm coupling. The double diaphragm version is designed for zero backlash, high precision and better misalignment compensation.

2. What is the difference between single and double disc diaphragm couplings?

A single disc coupling is more compact. A double disc diaphragm coupling provides greater flexibility, better misalignment compensation and higher torsional rigidity for servo and stepper motor applications.

3. Can you customize the bore size and keyway?

Yes. We support OEM, ODM and OBM. Custom bore diameter, keyway, clamping screw, material, surface treatment and branding are available.

4. Is this coupling zero backlash?

Yes. The clamping connection and diaphragm disc design provide zero backlash, making it suitable for positive and negative rotation and high-precision control.

5. What is the maximum speed?

The standard listed maximum speed is 3,000 RPM. Depending on model, balance grade and configuration, rotation speed can reach up to 10,000 r/min. Please confirm with our engineer for high-speed applications.

6. What industries use this aluminum diaphragm coupling?

It is widely used in servo motors, stepper motors, CNC machines, automation, packaging, printing, food machinery, robotics, semiconductor equipment, medical instruments and general industrial machinery.

7. What certificate and warranty do you provide?

We provide ISO9001 and BV certificate. The warranty is 1 year.

Request a Quote for Double Diaphragm Shaft Coupling

Ready to improve your servo or stepper motor drive system with a high precision aluminum double diaphragm shaft coupling? Send us your bore size, torque, speed, keyway requirement and quantity. Our engineering team will recommend the right model and provide a quotation quickly.

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