DIC Aluminum Parallel Line Clamping Coupling – Zero Backlash Flexible Coupling for Stepper/Servo Motors

Factory Direct | High-Strength 7075 Aluminum Alloy | Zero Backlash | Parallel Line (Slit) Design | 0.5-15 N·m Torque | 9500 RPM | Clamping Screw Fastening | Anodized Finish | Maintenance-Free | OEM Customizable

The Apexcoupling DIC series is a high-precision aluminum parallel line clamping coupling (also known as a slit coupling or helical beam coupling) engineered for precision motion control applications. Featuring a one-piece 7075 aluminum construction with parallel slit cuts, this coupling delivers zero backlash torque transmission, excellent misalignment compensation, and effective vibration absorption. The parallel line (slit) design allows the coupling to flex and accommodate angular, radial, and axial misalignment while maintaining high torsional stiffness and low inertia. With clamping screw fastening, anodized surface, and H7 precision bore, the DIC series is the ideal solution for stepper motors, servo motors, encoders, resolvers, 3D printers, CNC machines, and miniature drive systems.

✅ Zero backlash – no lost motion for precise positioning. High-strength 7075 aluminum – lightweight and durable. Slit design absorbs vibration and compensates misalignment. Anodized finish – corrosion-resistant and professional. Maintenance-free – no lubrication required.

Key Technical Specifications

🔧 Custom bores and special materials available. Contact us with your specifications.

DIC Series – Typical Model Range (Reference)

📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.

Product Structure

1. One-Piece 7075 Aluminum Body – Precision-machined from high-strength aerospace-grade aluminum alloy.

2. Parallel Line (Slit) Cuts – Multiple parallel slits that provide flexibility and misalignment compensation.

3. Clamping Screw Fastening – Secure shaft fixation with even clamping force.

4. Anodized Surface – Corrosion-resistant and professional appearance.

💡 How it works: The DIC coupling features a series of parallel slit cuts machined into a single-piece aluminum body. These cuts create a flexible “spring-like” section that allows the coupling to flex under load. When torque is applied, the slits flex to accommodate angular, radial, and axial misalignment while transmitting torque smoothly. The design provides zero backlash operation, which is crucial for precision control in encoders, servo systems, and automated machinery. The coupling also absorbs vibrations and shocks, protecting connected equipment from damage.

Product Features & Advantages

Why Choose a Slit (Parallel Line) Coupling?

Slit couplings (parallel line couplings) are widely used in precision applications where zero backlash, low inertia, and misalignment compensation are critical. Key advantages include:

• Zero Backlash: Essential for encoders and resolvers where accurate position feedback is required.

• High Misalignment Tolerance: Accommodates angular, radial, and axial misalignment, making them suitable for applications where precision alignment is challenging.

• Low Inertia: The lightweight design makes them ideal for high-speed operation and quick starts/stops.

• Vibration Damping: Absorbs vibrations and shocks, protecting sensitive equipment.

• Maintenance-Free: No lubrication required, reducing downtime and maintenance costs.

Applications

• Stepper Motors – Accurate positioning and step transmission

• Servo Motors – Precision motion control systems

• Encoders & Resolvers – Precision position feedback systems

• 3D Printers – Z-axis coupling, filament drive systems

• CNC Machines – Small CNC machines, engraving machines

• Medical Devices – Precision medical equipment

• Robotics – Small robot joint drives

• Automation Equipment – Pick-and-place systems, indexing tables

• Laboratory Equipment – Precision testing and measurement instruments

Why Choose Apex Coupling for DIC Parallel Line Couplings?

FAQ

Q: What is a parallel line coupling (slit coupling)?
A: A parallel line coupling (also called a slit coupling or helical beam coupling) is a flexible coupling with parallel slit cuts machined into a single-piece metal body. The cuts allow the coupling to flex, accommodating misalignment while transmitting torque with zero backlash.

Q: What is the advantage of the slit (parallel line) design?
A: The slit design provides zero backlash, excellent misalignment compensation (angular, radial, and axial), vibration absorption, and low inertia – making it ideal for precision applications like encoders, 3D printers, and servo motors.

Q: What materials are used?
A: The DIC series is manufactured from 7075-T6 high-strength aluminum alloy – an aerospace-grade material that is lightweight, durable, and corrosion-resistant.

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

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

Q: Is the coupling maintenance-free?
A: Yes. The DIC series is maintenance-free – no lubrication required.

Q: What are the common applications?
A: Stepper motors, servo motors, encoders, resolvers, 3D printers, CNC machines, robotics, medical devices, and automation equipment.

Q: Can the coupling compensate for misalignment?
A: Yes. The slit design compensates for angular, radial (parallel), and axial misalignment.

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

Request a Quote

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