AL-S Keyless Locking Assembly – Straight Type, Double Taper, High Torque Shaft-Hub Connection

Factory direct | S45C steel | Double taper design | 250–20,000,000 N·m torque | No axial movement during installation | OEM/ODM/OBM

The Apexcoupling AL-S series is a straight type, double taper keyless locking assembly (also known as a shrink disc or cone clamping element) designed for high-torque power transmission between shafts and hubs. Featuring a double cone design with an open split inner ring, an open split outer ring, and two double-taper pressure rings, this locking assembly delivers superior radial pressure and load capacity compared to single-taper designs. The keyless friction-lock connection eliminates keyways, reducing stress concentrations and enabling backlash-free torque transmission.

✅ Ideal for packaging machinery, printing presses, textile equipment, and machine tools – where reliable, high-torque shaft-hub connections are critical.

Key Technical Specifications

🔧 Custom bore sizes, materials, and special designs available. Contact us with your specifications.

Product Structure & Components

The AL-S locking assembly (A2 type) consists of four main components:

💡 How it works: When the hexagon socket screws are tightened, the two pressure rings are drawn toward each other. This action compresses the split inner ring onto the shaft and expands the split outer ring against the hub bore – creating a friction-lock connection that transmits torque without keys.

Product Features & Advantages

A1 Type vs A2 Type (AL-S) Comparison

✅ The AL-S (A2 type) delivers superior performance with the same tightening effort – making it the preferred choice for demanding applications.

Technical Data

Applications

• Packaging Machinery – High-torque shaft-hub connections

• Printing Presses – Precision registration, no backlash

• Textile Machinery – Reliable power transmission

• Machine Tools – CNC spindles, feed drives

• Manufacturing Plants – General power transmission

• Food & Beverage Equipment – Hygienic, keyless connections

• Construction Machinery – Heavy-duty drives

• Energy & Mining Equipment – High-torque applications

• Conveyor Systems – Material handling

• Wind Turbines – Main shaft connections (high torque)

Why Choose Apex Coupling for AL-S Locking Assemblies?

FAQ

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

Q: What is the difference between AL-S and other locking assemblies?
A: The AL-S series features a double taper (double cone) design with four components: a split inner ring, a split outer ring, and two pressure rings. Compared to single-taper designs, it delivers greater radial pressure and higher load capacity with the same clamping force.

Q: What does “no axial movement during installation” mean?
A: When tightening the screws, the elastic rings do not move axially relative to the shaft or hub. This means the axial position of the hub is maintained during installation – critical for precision applications.

Q: What is the torque range?
A: The AL-S series covers 250 to 20,000,000 N·m. Custom higher torque capacities are available on request.

Q: What material is used?
A: Standard material is S45C carbon steel – offering high strength and good wear resistance.

Q: Is the assembly self-centering?
A: No. The AL-S series is not self-centering. Pre-centering is required during installation to ensure concentricity.

Q: How is the assembly removed?
A: The AL-S series features removal screw holes (2–4 per pressure ring). Simply insert screws into these holes to push the pressure rings apart for easy disassembly.

Q: Can the assembly be reused?
A: Yes. The AL-S locking assembly can be disassembled and reinstalled multiple times without damage – reducing long-term costs.

Q: What are the main applications?
A: Packaging machinery, printing presses, textile machinery, machine tools, manufacturing plants, food & beverage equipment, construction machinery, and energy & mining equipment.

Q: Do you offer custom sizes?
A: Yes. We offer OEM, ODM, and OBM support – custom bore sizes, materials, and designs available.

Request a Quote

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