High-Torque Zero-Backlash Keyless Shaft Connection: CSF-A3 Expansion Locking Assembly

The Apexcoupling CSF-A3 Type Keyless Shaft Locking Assembly is an advanced friction-based expansion sleeve designed to replace traditional keyed shaft connections, splines, and press fits. Built according to the JB/T7934-1999 standard, the CSF-A3 features precision inner and outer taper rings that contract onto the shaft and expand into the hub bore as the Grade 12.9 inner hexagon socket screws are tightened. This mechanical wedge action creates a uniform 360° high-pressure friction grip capable of transferring high axial forces and heavy rotational torque loads without shaft weakening or stress concentrations.

As detailed in the technical paramer in the CSF-A3 locking device features an extended connecting interface length, providing exceptional concentricity and high rotation accuracy. Manufactured from forged 45# steel / S45C steel with options for blackening or nickel plating, this assembly accommodates shaft diameters ranging from 20mm to 150mm (with custom sizing across 18–200mm) and manages rated torque capacities up to 28.5 Kn.m (28,500 N·m).

[Core Product Advantages / Unique Selling Points]

• Keyless Friction Torque Transmission: Eliminates keyway cutting and stress concentration points, preserving shaft integrity while preventing fretting corrosion and backlash.

• Exceptional Concentricity & Stability: Features an extended contact interface length (L1 up to 65mm) and precision-machined taper angles for high rotational accuracy.

• High-Strength Grade 12.9 Hardware: Equipped with Grade 12.9 inner hexagon socket locking bolts that provide high clamping forces and reliable torque transfer.

• Easy Assembly & Integrated Disassembly Holes: Designed with integrated threaded disassembly holes in the cone ring, allowing straightforward removal during maintenance without damaging shafts or hub components.

• Broad Load Capacity Matrix: Handles axial forces up to 380 kN and torque ratings ranging from 0.3 Kn.m (300 N·m) for 20mm inner hole models up to 28.5 Kn.m (28,500 N·m) for 150mm inner hole sizes.

• Durable Surface Protection Options: Precision machined from 45# / S45C steel with conventional blackening (oxide) or corrosion-resistant nickel plating finishes.

• Versatile Industrial Application: Optimized for demanding drive systems across Manufacturing Plants, Construction Works, Mining Machinery, Energy Systems, and Garment Shops.

• Direct Factory Sourcing & Customization: Sourced directly from our manufacturing hub in Guangdong, China with full OEM, ODM, and OBM support for special dimensions, surface treatments, or custom screw configurations.

[Technical Specifications Table]