DLZ Aluminium Alloy Expansion Sleeve Jaw Coupling – MZG21 / DCJ21 Compatible

Factory Direct from Guangdong, China | High-Strength Aviation Aluminium Alloy | Expansion Sleeve Clamping Design | Zero Backlash | H7 Precision Bore | German Imported Polyurethane Spider | For Servo Motors, Spindles & High-Speed Drives | Custom Bores Available

Product Overview

The DLZ Aluminium Alloy Expansion Sleeve Jaw Coupling from Apexcoupling is a high-precision flexible shaft coupling engineered for reliable torque transmission, zero backlash, and long service life in demanding motion control applications. Manufactured in Dongguan, Guangdong, China, this coupling is an ideal solution for servo motors, high-speed spindles, ball screws, and precision drive systems. It is compatible with MZG21, DCJ21, and JAW style couplings.

The coupling features a high-strength aviation aluminium alloy body with an expansion sleeve clamping design, ensuring a firm, zero-backlash connection between shaft and hub. The H7 precision bore and polished surface deliver high concentricity, accurate shaft fit, and powerful locking. The German-imported polyurethane spider absorbs vibration, compensates for radial, angular, and axial misalignments, and offers excellent wear resistance, oil resistance, and electrical insulation.

The expansion sleeve structure is specifically designed for high-speed, high-torque transmission, making it suitable for main spindles, servo motors, and reversing applications. The coupling is detachable, easy to install, and requires no lubrication, ensuring low maintenance and continuous long-term operation. The anodized surface provides excellent corrosion resistance and a professional appearance.

With ISO certification and full customization support (bores, keyways, hexagon, square, spline), the DLZ coupling is a reliable and cost-effective alternative to imported precision couplings.

📧 Get a Quote: ella@apexcoupling.com | WhatsApp/WeChat: +86 13431039760

Key Attributes

Key Features

Technical Specifications

Product Details

01. Aviation-Grade Aluminium Alloy with Oxidation Treatment
The hubs are made from high-strength aviation aluminium alloy, precision-machined for a smooth, polished finish. The oxidized surface provides excellent corrosion resistance and a professional appearance.

02. Expansion Sleeve Clamping Design
The expansion sleeve structure ensures a firm connection between the shaft and hub, eliminating backlash and making the coupling suitable for both forward and reverse rotation.

03. H7 Precision Bore
The bore tolerance is controlled within H7 precision, ensuring high concentricity, accurate shaft fit, and powerful locking.

04. German Imported Polyurethane Spider
The polyurethane elastomer offers excellent wear resistance, oil resistance, and electrical insulation, with a wide adjustable range. It absorbs vibration and compensates for radial, angular, and axial misalignments.

05. Detachable Design
The coupling is easy to install and remove, reducing maintenance downtime.

06. No Lubrication & Low Maintenance
The coupling requires no lubrication, has low maintenance requirements, and can operate continuously for long periods.

Applications

The DLZ aluminium alloy expansion sleeve jaw coupling is widely used in:

• Servo Motors – High-precision closed-loop control systems

• High-Speed Spindles – Main spindle drives and precision machining

• Ball Screws – Smooth, reaction-free linear motion

• CNC Machine Tools – Milling, turning, drilling, and engraving machines

• Factory Automation (FA) – Robotic arms, conveyors, and pick-and-place systems

• Metallurgy & Mining – Crushers, conveyors, and processing equipment

• Petroleum & Chemical – Pumps, compressors, and mixers

• Lifting & Transportation – Cranes, hoists, and conveyor systems

• Light Textile & Printing – Spinning, weaving, and printing machinery

• Water Pumps & Fans – Centrifugal pumps, water supply, and ventilation

• Packaging Machinery – High-speed packaging and filling lines

• Semiconductor Equipment – Wafer handling and precision stages

• Medical Equipment – Diagnostic and surgical positioning devices

• Railway Track Equipment – Durable and stable coupling solutions

Customization Options

Apexcoupling offers extensive customization for DLZ jaw couplings:

• Custom bore diameters and lengths

• Keyway, hexagon, square, and spline bores

• Alternative materials: aluminium alloy, stainless steel, steel

• Alternative elastomer materials: PU, NBR, Viton

• Surface treatments: oxidation, black oxide, nickel plating

• Drawing-based production

• OEM / ODM / OBM with your branding

📧 Send your drawing or requirements to: ella@apexcoupling.com

Why Choose Apexcoupling?

🏭 Factory Direct in Dongguan, China – Integrated manufacturing and trading, competitive pricing

🔩 Premium Aviation-Grade Aluminium Alloy – Lightweight, corrosion-resistant, and durable

⚙️ Expansion Sleeve Clamping Design – Zero backlash and secure shaft connection

📐 H7 Precision Bore & Polished Surface – High concentricity and accurate fit

🧵 German Imported Polyurethane Spider – Vibration damping and misalignment compensation

🔧 Detachable & Maintenance-Free – Easy installation and long-term operation

✅ ISO Certified – Quality assurance and international interchangeability

📦 Fast Delivery – Factory stock and efficient production for urgent orders

💬 Expert Technical Support – We help you select the correct coupling for your application

Get a Quote Today

Ready to order or need more information? Contact us directly:

📧 Email: ella@apexcoupling.com
📱 WhatsApp / WeChat: +86 13431039760
🌐 Website: www.apexcoupling.com

We reply within 24 hours with pricing, availability, and technical recommendations.

Product Tags: DLZ aluminium expansion sleeve jaw coupling, MZG21 coupling, DCJ21 connector, expansion sleeve jaw coupling, aluminium jaw coupling, servo motor coupling, zero backlash coupling, H7 precision coupling, polyurethane spider coupling, Apexcoupling