ML-S Stainless Steel Shrink Disc – Nut Wedge Type Keyless Locking Assembly, H7 Bore

Factory direct | SUS304 stainless steel | Nut wedge keyless locking | Zero backlash | Overload protection | H7 bore | Reusable | Corrosion-resistant

The Apexcoupling ML-S series is a stainless steel shrink disc (nut wedge type keyless locking assembly) designed for high-reliability shaft-to-hub connections in demanding industrial environments. Featuring a SUS304 stainless steel construction with H7 precision bore, this keyless locking device provides a zero-backlash, friction-based connection without the need for keyways, splines, or threads. The nut wedge mechanism ensures secure, uniform clamping force with simple installation and removal. In the event of overload, the ML-S shrink disc slips to protect connected equipment. With excellent corrosion resistance, reusability, and high torque capacity, the ML-S 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.

✅ Keyless friction-lock connection – no keyways, no backlash, no shaft weakening. Overload protection – slips to protect equipment. Reusable – multiple installation cycles. Corrosion-resistant – SUS304 stainless steel.

Key Technical Specifications

🔧 Custom bores, outer diameters, and special finishes available. Contact us with your specifications.

ML-S Series – Model Range & Specifications

📐 Custom bores, outer diameters, and additional sizes available upon request. Contact our engineering team for custom sizing.

Model Designation – ML-S Series

ML-S-□□×□□

Example: ML-S-8×4 = Outer diameter 8mm, Inner diameter 4mm

Customization Options:

• Add K after bore size for keyway: ML-S-8×4-K

• Add F for hexagon hole: ML-S-8×4-F

• Add S for square hole: ML-S-8×4-S

• Add H for spline hole: ML-S-8×4-H

Product Structure – Nut Wedge Keyless Locking

1. Outer Nut Ring – Wedge-type locking mechanism with threaded engagement.

2. Inner Tapered Ring – SUS304 stainless steel, precision-machined with H7 bore.

3. Clamping Mechanism – Nut wedge design provides uniform radial clamping force.

4. Locking Screws – High-strength fasteners for secure installation.

💡 How it works: The ML-S shrink disc uses a nut wedge mechanism to create a friction-lock connection between shaft and hub. As the nut is tightened, the tapered inner ring is compressed, generating radial pressure that locks the hub securely onto the shaft. This creates a zero-backlash, keyless connection that transmits torque and axial forces through friction. In the event of overload, the assembly slips to protect connected equipment. The design allows for easy installation and removal, and the assembly can be reused multiple times.

Product Features & Advantages

Keyless Locking vs Traditional Keyway – Why Choose Shrink Disc?

Applications

• CNC Machine Tools – Precision spindle connections, zero backlash requirement

• Food Packaging Machinery – Corrosion-resistant, hygienic connections

• Metallurgical Equipment – High-torque, heavy-load 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 ML-S Shrink Discs?

FAQ

Q: What is a shrink disc (keyless locking assembly)?
A: A shrink disc (also called a keyless locking assembly) is a friction-based mechanical device that connects a hub to a shaft without using keys or keyways. It transmits torque and axial forces through radial clamping pressure.

Q: What is the advantage of the nut wedge design?
A: The nut wedge mechanism provides simple installation – just tighten the nut to create the clamping force. No special tools required.

Q: What materials are used?
A: The ML-S series is manufactured from SUS304 stainless steel – offering excellent corrosion resistance for demanding environments.

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

Q: Does the coupling have backlash?
A: No. The ML-S shrink disc features zero backlash – no rotational clearance, ensuring precise positioning.

Q: Does the shrink disc provide overload protection?
A: Yes. In the event of overload, the shrink disc slips, protecting connected equipment from damage.

Q: Can the assembly be reused?
A: Yes. The ML-S shrink disc can be disassembled and reinstalled multiple times without damage.

Q: What are the common applications?
A: CNC machine tools, 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, and finishes available.

Q: What is the maximum torque and axial force?
A: Standard ratings are 6.9 N·m torque and 29.4 kN axial force. Custom higher ratings available on request.

Request a Quote

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