Superior Angular Vibration Dampening: XL DJ-A 45# Steel Star-Shaped Clamping Coupling

The XL Series DJ-A Star-Shaped Flexible Clamping Coupling  is precision-engineered to deliver robust torque transmission, high concentricity, and excellent shock-absorption for industrial water pumps, conveyor drives, and automated manufacturing systems. When connecting driving motor spindles to driven equipment shafts, mechanical vibrations and angular misalignments can cause rapid bearing wear. The DJ-A jaw-type coupling solves this by squeezing a resilient polyurethane elastomeric spider insert tightly between two precision-machined interlocking hubs, providing an excellent balance of high torsional strength and smooth, flexible vibration isolation.

Constructed from premium 45# medium-carbon round bar steel with zero sand holes or structural impurities, the coupling hubs deliver incredible hardness and large torque ratings. The entire steel body is treated with a professional black oxide anti-corrosion finish, ensuring higher stability and wear resistance than conventional cast metals. To maintain a tight, balanced grip on your shafts, the internal hubs are ground to a strict H7 precision bore tolerance and employ a powerful clamping mechanism to completely eliminate rotational play.

Core Product Advantages

• Impurity-Free 45# Forged Round Steel: Precision-machined from high-quality 45# structural steel round bars containing zero sand holes or impurities, delivering extreme material stability, high hardness, and large torque capabilities.

• Wear-Resistant Polyurethane Dampening Pad: Utilizes a resilient polyurethane star-shaped spider insert that dampens structural vibrations, isolates impact shocks, minimizes mechanical wear, and extends drivetrain component service life.

• Strict H7 Inner Bore Precision: Internal coupling bores are machined to a strict H7 tolerance standard, delivering high concentricity, perfect axial alignment, and a powerful, reliable shaft lock.

• Secure Zero-Backlash Clamping Fit: The DJ-A model utilizes a split-hub clamping fastening method that compresses uniformly around the shaft circumference, maximizing frictional holding power without damaging the metal.

• Protective Black Oxide Finish: Treated with an industrial surface blackening process to shield the raw carbon steel from moisture, oil splashes, and corrosive chemical vapors.

• High-Speed Balance Performance: Features a compact, balanced design supporting nominal torques up to 15 N·m (with dynamic peak thresholds reaching 20 N·m) and safe rotational speeds up to 19,000 RPM.

• Direct Factory Custom Sourcing: Backed by Apexcoupling’s advanced manufacturing facility, we offer full support for non-standard custom drawings, specialized metric bores, custom keyways, and unique length configurations.

Technical Specifications Table