Flexible Coupler (3mm to 4mm)

Overview

Connect a 3mm shaft to a 4mm shaft with ease using this high-quality flexible coupler from MOKWN. Designed for precision motion systems, this coupler features a spiral cut that provides the flexibility needed to accommodate slight misalignments, reducing stress on your motors and shafts. Whether you're building a CNC machine, a 3D printer, or a robotics project, this coupler ensures smooth, reliable power transmission.

Key Features

• Flexible Spiral Design: The spiral cut allows for angular and parallel misalignment, preventing damage to bearings and shafts.
• Secure Connection: Two sets of set screws provide a firm grip on both shafts, ensuring no slippage during operation.
• Durable Construction: Made from high-grade aluminum alloy, offering a balance of strength and lightweight performance.
• Versatile Sizing: Specifically designed to connect a 3mm shaft to a 4mm shaft, ideal for stepper motors and lead screws.
• Easy Installation: Simple to mount with standard hex wrenches; no special tools required.

Technical Specifications

• Material: Aluminum Alloy
• Shaft Diameter 1: 3mm
• Shaft Diameter 2: 4mm
• Outer Diameter: 20mm (typical)
• Length: 25mm (typical)
• Set Screws: 2 sets (4 screws total)
• Color: Silver (anodized)
• Weight: Approx. 20g

Applications & Use Cases

• CNC Machines: Connect stepper motors to lead screws for precise positioning.
• 3D Printers: Link motors to threaded rods for z-axis movement.
• Robotics: Transmit torque between motors and gearboxes or wheels.
• Automation Systems: Ideal for any application where shaft alignment is not perfect.
• DIY Projects: Perfect for hobbyists and makers building custom machinery.

What's Included

• 1 x Flexible Coupler (3mm to 4mm)
• 2 x Sets of Set Screws (4 screws total)

Compatibility

• Compatible with NEMA 17 and NEMA 23 stepper motors (shaft sizes 5mm, 6.35mm, 8mm) when paired with appropriate adapters or if the motor shaft is 3mm or 4mm.
• Works with standard lead screws (T8, TR8, etc.) with 4mm diameter.
• Suitable for most CNC and 3D printer kits that require a 3mm to 4mm shaft connection.

MOKWN Recommendation

For a reliable and easy-to-install coupling solution, the Flexible Coupler (3mm to 4mm) is an excellent choice. It's a must-have for any maker working on precision motion projects. We recommend checking your shaft sizes before ordering to ensure a perfect fit. For any questions, our team in Egypt is here to help you select the right components for your build.