Superior Rigidity & Dampening: High-Precision XL Star Jaw Plum Coupling

The XL High-Precision Star Jaw Plum Coupling  offers a high-performance balance of torsional stiffness, structural endurance, and vibration isolation for modern motion control systems. Engineered specifically for high-torque servo motor alignments, CNC precision lathes, and automated machinery, the XL series utilizes an advanced three-piece jaw design. By sandwiching a curved elastic polyurethane spider element between two precision-machined steel hubs, this coupling successfully limits mechanical shock, dampens resonance, and corrects parallel, angular, and axial offsets.

Unlike standard cast or low-grade steel options, our coupling hubs are machined entirely from premium solid 45# medium-carbon round steel with a protective surface blackening treatment. This solid material guarantees a uniform grain structure free of internal sand holes or gas impurities, providing higher stability, increased torque transmission, and an extended operational lifespan.

Core Product Advantages

• Solid 45# Steel Construction: Machine-forged from structural-grade 45# carbon steel, ensuring high material hardness and fatigue resistance under continuous reversing loads.

• High-Precision H7 Dimensional Bores: Every internal bore profile is machined to strict H7 tolerance standards, ensuring high concentricity, a snug shaft fit, and exceptional lock holding power.

• Anti-Corrosive Surface Blackening: Coated with a professional industrial black oxide finish to enhance wear resistance and shield the raw steel from oxidation and environmental moisture.

• Premium Polyurethane Dampening Element: Features a highly resilient polyurethane rubber spider pad that absorbs heavy start-stop inertia and reduces motor bearing wear.

• Zero Backlash Backed by High Torque: Specially tuned for servo systems and CNC feeds to ensure smooth, precise rotational synchronization without angle drift or rotational play.

• Direct Source Factory Non-Standard Tailoring: Backed by Apexcoupling’s advanced production plant, we offer a comprehensive customization track including unique metric-to-inch bore steps, custom keyways, clamping slots, and custom dimensions built directly from your prints.

Technical Specifications Table