Kande D19L25 Aluminium Flexible Shaft Coupler for 3D Printers

Kande D19L25 Aluminium CNC Flexible Shaft Coupler — 19mm×25mm

Upgrade your 3D printer, CNC machine, or stepper motor setup with the Kande D19L25 Miniature Flexible Shaft Coupler. Precision-machined from high-quality aluminium, this D19L25 coupling delivers smooth, reliable torque transmission with built-in flexibility to compensate for minor shaft misalignments — keeping your motion system running accurately and efficiently.

Key Features

• Model: D19L25 (19mm outer diameter × 25mm length)
• Material: CNC-machined aluminium — lightweight, strong, and corrosion-resistant
• Compatible Bore Sizes: 3, 4, 5, 6, 6.35, 7, and 8mm inner diameters available
• Flexible helical design absorbs vibration and compensates for angular, parallel, and axial misalignment
• Versatile use: ideal for stepper motors, servo motors, encoders, lead screws, machine platforms, and more
• Notation guide: e.g. "3×3" means both shaft ends are 3mm bore
• Easy installation with set-screw clamping on each end
• Made in Mainland China

Specifications

What Is It Used For?

The D19L25 flexible coupler is widely used in desktop 3D printers (Z-axis lead screw connections), CNC routers, laser engravers, and automation equipment. Its helical-cut flexibility allows it to accommodate minor misalignment between motor shafts and lead screws, reducing mechanical stress and improving print or cut accuracy.

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Frequently Asked Questions

Q: What bore size should I choose for my 3D printer's Z-axis lead screw coupling?

A: Most desktop 3D printers use a 5mm stepper motor shaft paired with an 8mm lead screw, so a 5×8mm D19L25 coupler is the most common choice. However, check your specific motor shaft and lead screw diameters before ordering — options range from 3mm to 8mm (including 6.35mm for imperial shafts).

Q: What does the "D19L25" designation mean?

A: D19 refers to the 19mm outer diameter of the coupler body, and L25 refers to its 25mm length. These dimensions determine how much space the coupler occupies and its torque capacity — the D19L25 is a compact, miniature-sized coupler well suited for desktop 3D printers and small CNC machines.

Q: Is this coupler rigid or flexible?

A: This is a flexible helical shaft coupler. The helical cuts machined into the aluminium body allow it to flex slightly, absorbing vibration and compensating for small misalignments between two shafts. This helps protect motor bearings and improves motion accuracy compared to fully rigid couplers.

Q: How is the coupler secured to the shafts?

A: Each end of the coupler features a set screw (grub screw) that clamps firmly onto the shaft. Simply slide each shaft end into the corresponding bore, align properly, and tighten the set screws with the appropriate hex key for a secure, play-free connection.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.