CSF-A18 Keyless Locking Assembly – S45C Steel, Double Cone + Wedge Type, 676–2930 N·m

Factory direct | S45C steel body | Double cone + mechanical wedge type | 676–2930 N·m torque | 12.9 grade screws | Black oxide or nickel plating | Backlash-free | Overload protection | OEM/ODM/OBM

The Apexcoupling CSF-A18 series is a high-performance keyless locking assembly (shaft locking device / shrink disc) designed for secure friction-based shaft-to-hub connections in heavy-duty industrial applications. Featuring a double cone + mechanical wedge type tightening method, this locking assembly delivers high radial clamping force with minimal axial movement during installation. Manufactured from S45C carbon steel with 12.9 grade high-strength screws, it provides exceptional torque transmission capacity, zero backlash, and overload protection. With an inner hole range of 25–320 mm and outer diameter range of 50–405 mm, the CSF-A18 series is the ideal solution for manufacturing plants, machinery repair shops, food & beverage factories, printing shops, construction, energy & mining, and general industrial machinery.

✅ Backlash-free, keyless shaft-hub connection. Overload slip protection – safeguards equipment. Double cone + wedge design – high clamping force. 12.9 grade screws – reliable fastening.

Key Technical Specifications

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

CSF-A18 Series – Model Range & Specifications

📐 All CSF-A18 series locking assemblies feature 12.9 grade high-strength screws.

Product Structure

1. Double Cone Inner Ring – Split tapered ring that grips the shaft.

2. Double Cone Outer Ring – Split tapered ring that grips the hub bore.

3. Mechanical Wedge / Pressure Rings – Transmit clamping force when screws are tightened.

4. 12.9 Grade High-Strength Screws – When tightened, they draw the components together, creating high radial pressure.

💡 How it works: The CSF-A18 locking assembly uses a double cone + mechanical wedge type tightening method. When the 12.9 grade screws are tightened, the tapered rings are forced together, creating high radial pressure between the inner ring and the shaft, and between the outer ring and the hub bore. This friction-lock connection transmits torque and axial forces without any keyways, backlash, or relative motion. The assembly is not self-centering and requires pre-centering during installation.

Double Cone + Wedge Type – Key Advantage

✅ The double cone + mechanical wedge design provides higher clamping force and greater torque capacity compared to single cone designs.

Product Features & Advantages

Applications

• Manufacturing Plants – General power transmission, conveyor systems

• Machinery Repair Shops – Replacement and upgrade parts

• Food & Beverage Factories – Hygienic, corrosion-resistant connections

• Farms & Agriculture – Agricultural machinery, PTO drives

• Printing Shops – Precision register control

• Construction Works – Heavy equipment, building material handling

• Energy & Mining – Crushers, conveyors, feeders, mills

• Wind Turbines – Main shaft connections

• Gearboxes – Input/output shaft connections

• Pulleys, Sprockets, Gears, Impellers – Direct shaft-to-hub connections

Why Choose Apex Coupling for CSF-A18 Locking Assemblies?

FAQ

Q: What is a keyless locking assembly?
A: A keyless locking assembly (also called a shaft locking device, shrink disc, or clamping element) 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 keyless connection over keyways?
A: Keyless connections eliminate keyway stress concentrations, backlash, and shaft weakening. They also allow for easy axial and radial adjustment during installation, easy removal, and overload protection.

Q: What does the CSF-A18 stand for?
A: CSF-A18 is a model designation for this specific double cone + mechanical wedge type locking assembly. The “CSF” typically refers to the series, and “A18” indicates the design type with specific dimensional parameters.

Q: What materials are used?
A: The body is made of S45C carbon steel with either black oxide or nickel plating. The screws are 12.9 grade high-strength alloy steel.

Q: What is the bore diameter range?
A: Standard CSF-A18 series covers 25 mm to 320 mm. Custom sizes available on request.

Q: What is the torque range?
A: The allowable torque range is 676–2930 N·m.

Q: Is the assembly self-centering?
A: No. The CSF-A18 is not self-centering. Pre-centering is required during installation.

Q: What is the tightening method?
A: The tightening method is double cone type + mechanical type (wedge type) .

Q: Does the assembly provide overload protection?
A: Yes. Under extreme overload, the assembly will slip, protecting connected equipment from damage.

Q: Can the assembly be reused?
A: Yes. The CSF-A18 locking assembly can be disassembled and reinstalled multiple times without damage.

Request a Quote

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