Superior Positioning Torque: DLZ Keyless Expansion Sleeve Jaw Coupling

The DLZ Series Jaw Coupling with Integrated Expansion Sleeve is engineered to meet the demanding requirements of high-speed stepper motors, dynamic AC/DC servo systems, and precision motion control hardware. Standard set-screw or simple clamp designs can slip or suffer from keyway wall wear under rapid acceleration cycles. The DLZ jaw coupling solves this issue by utilizing an integrated keyless friction expansion sleeve. This clamping configuration provides a uniform 360-degree lock onto the shaft, completely eliminating rotational play and mechanical backlash. It is widely used in high-precision setups including CNC machine tools, semiconductor positioning stages, packaging lines, and automated wood-processing plants.

Constructed for long-term reliability, the structural clamping hubs are forged from premium 304 Stainless Steel and high-strength Aviation Aluminum Alloy, protected by a specialized surface oxidation and bright polishing treatment. At the center is a high-performance, German-imported polyurethane elastic star insert that dampens shock loads, limits vibrations, isolates electrical currents, and compensates for axial, radial, and angular shaft misalignments.

Core Product Advantages / Unique Selling Points

• Integrated Keyless Friction Locking Sleeve: Utilizes a tapered wedge expansion mechanism that clamps evenly around the shaft, preventing slippage and eliminating the need for traditional keyways.

• True Zero Backlash Motion Profile: Engineered for highly accurate positional indexing and synchronization during fast direction reversals—perfect for high-end servo and stepper motor drives.

• Premium Aerospace Aluminum & 304 Stainless Steel: Combines low rotational inertia from high-grade aviation aluminum hubs with the excellent corrosion resistance of 304 stainless steel sections.

• Imported German Polyurethane Spider Inserts: Equipped with premium polyurethane elastic inserts that provide excellent oil resistance, vibration dampening, and a wide operating temperature range.

• Strict H7 Standard Bore Precision: All internal mounting hubs are ground to a tight H7 tolerance window to ensure true concentricity and a wobble-free fit on precision motor spindles.

• Smooth Surface Oxidation and Polish Finish: Features specialized anodized and polished surfaces that improve surface hardness and deliver excellent wear and scratch resistance.

• Flexible Sizing and Blueprint Sourcing: As shown in our product database in Jaw coupling, we provide standard stock and custom footprints like DLZ-55*78 (Bore 12-28mm), DLZ-65*90 (Bore 14-38mm), and DLZ-80*111.5 (Bore 19-45mm).

Technical Specifications Table