Aluminum Blue Rigid Coupling L25×D14mm | 5mm to 8mm

Product Overview

The Aluminum Blue Small Coupling (L25×D14mm) from Pro Tronix is an essential hardware component for motion control systems. It is specifically designed to connect the output shaft of a NEMA 17 stepper motor (typically 5mm) to an 8mm lead screw (standard for Z-axis movement). Unlike flexible couplers that allow for misalignment, this rigid design provides a solid, direct connection, minimizing “backlash” and ensuring the highest possible accuracy for your mechanical projects.

Technical Specifications

Key Features

• Precision Machined: Bored to exact tolerances of 5mm and 8mm to ensure a snug fit and perfect alignment of the rotating axes.

• Rigid Power Transfer: Zero flexibility means 100% of the motor’s torque is transferred to the lead screw, ideal for heavy-lift Z-axis applications.

• Durable Anodized Finish: The blue coating doesn’t just look professional—it protects the aluminum from oxidation and wear.

• Low Inertia: Its compact 14mm diameter and aluminum construction keep the rotational mass low, allowing for faster accelerations.

Common Applications

• 3D Printers: Connecting NEMA 17 motors to T8 lead screws for high-precision Z-axis movement.

• CNC Routers: Coupling stepper motors to drive shafts in small-scale milling machines.

• DIY Robotics: Connecting motor shafts to wheels or custom mechanical linkages.

• Automation Rigs: Used in any system requiring a reliable 5mm to 8mm transition.

You can see the rest of our available 3D printing and CNC parts from here: 3D Printer & CNC | Pro Tronix