CSF-A3S Series Shrink Disc – Keyless Locking Assembly, S45C / SUS304, Black Oxide / Electroless Nickel

Factory direct | S45C forged steel or SUS304 stainless steel | Black oxide or electroless nickel plating | Zero backlash | Overload protection | H7 bore | Reusable | Direct MLM replacement | OEM customizable

The Apexcoupling CSF-A3S series is a high-precision shrink disc (keyless locking assembly / shrink disc) designed for reliable shaft-to-hub connections in demanding industrial applications. Available in multiple material and finish options – CSF-A3S (S45C, black oxide), CSF-A3B (S45C, black oxide), CSF-A3SP (S45C, electroless nickel plating), and CSF-A3SS (SUS304 stainless steel) – this series delivers exceptional corrosion resistance, durability, and zero-backlash performance. The keyless friction-lock design eliminates the need for keyways, splines, or threads, providing a secure connection that protects equipment from overload damage. With simple installation (no heating, cooling, or special tools), H7 precision bore, and full reusability, the CSF-A3S series is the ideal solution for CNC machine tools, food packaging machinery, metallurgical equipment, semiconductor manufacturing, printing machinery, and factory automation.

✅ Keyless friction-lock connection – zero backlash, overload protection, easy installation. Direct replacement for MLM / Misumi series. Multiple material and finish options available.

Key Technical Specifications

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

CSF-A3S Series – Model Range & Specifications

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

Model Designation – CSF-A3S Series

💡 CSF-A3SP features electroless nickel plating – a uniform, hard, and corrosion-resistant coating ideal for applications requiring moderate corrosion protection. CSF-A3SS features SUS304 stainless steel construction for maximum corrosion resistance.

Product Structure – Keyless Locking Assembly

1. Inner Tapered Ring – Precision-machined with H7 bore, fits over the shaft.

2. Outer Tapered Ring – Provides clamping force when screws are tightened.

3. Locking Screws – High-strength bolts (12.9 grade) that create radial clamping pressure.

4. Removal Thread Holes – Pre-drilled holes for easy disassembly.

💡 How it works: The CSF-A3S shrink disc consists of inner and outer tapered rings with high-strength locking screws. When the screws are tightened to the specified torque, the tapered rings are forced together, creating high radial pressure that locks the hub securely onto the shaft. This creates a zero-backlash, keyless friction-lock connection that transmits torque and axial forces. In the event of overload, the shrink disc slips, protecting connected equipment from damage. The removal thread holes allow for easy disassembly without special tools.

Material & Finish Options – Choose What Fits Your Environment

✅ CSF-A3SS with SUS304 stainless steel is ideal for applications requiring maximum corrosion resistance – food processing, chemical plants, marine environments, and outdoor equipment.

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 (CSF-A3SP / CSF-A3SS)

• Metallurgical Equipment – High-torque, heavy-load applications

• Semiconductor Equipment – Clean room compatible, high precision (CSF-A3SS)

• Printing Machinery – Register control, high-speed operation

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

• Textile Machinery – High-speed, precision drives

• Chemical Industry – Corrosion-resistant applications (CSF-A3SS)

• Heavy Machinery – Crushers, conveyors, mills

• Light Industry – General power transmission

Why Choose Apex Coupling for CSF-A3S Shrink Discs?

FAQ

Q: What is a shrink disc (keyless locking assembly)?
A: A shrink disc (also called a keyless locking assembly or shrink disc) 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 created by tightening high-strength screws.

Q: What is the advantage of keyless locking over keyways?
A: Keyless locking provides zero backlash, no stress concentrations, no shaft weakening, overload protection, easy installation, reusability, and adjustability – offering superior performance compared to traditional keyways.

Q: What materials and finishes are available?
A: CSF-A3S / CSF-A3B – S45C forged steel with black oxide. CSF-A3SP – S45C forged steel with electroless nickel plating. CSF-A3SS – SUS304 stainless steel with natural passivated finish.

Q: What is electroless nickel plating?
A: Electroless nickel plating provides a uniform, hard, and corrosion-resistant coating – ideal for applications requiring moderate corrosion protection without the cost of stainless steel.

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

Q: Does the shrink disc have backlash?
A: No. The CSF-A3S series 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 CSF-A3S shrink disc can be disassembled and reinstalled multiple times without damage.

Q: Is this a direct replacement for MLM / Misumi series?
A: Yes. The CSF-A3S series is fully interchangeable with MLM / Misumi series – no design changes required.

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

Request a Quote

Send us your model (CSF-A3S, CSF-A3B, CSF-A3SP, or CSF-A3SS), bore size, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.