Aluminum Flexible Shaft Coupler for 3D Printer & CNC Machines
Aluminum Flexible Shaft Coupler for 3D Printer & CNC Machines
Aluminum Flexible Shaft Coupler for 3D Printers, Engraving & CNC Machines
Keep your motors running true with this compact Aluminum Alloy Flexible Shaft Coupler. Designed for 42mm stepper motors commonly used in 3D printers, engraving machines, CNC routers, boat models, and other DIY builds, this coupler absorbs minor shaft misalignment so your drives stay smooth and accurate. The helical-cut flexible section compensates for angular and parallel offsets without transmitting unwanted vibration to your lead screw or driven shaft.
Made in Mainland China.
Key Features
- Material: Durable aluminum alloy – lightweight yet rigid enough for precision motion
- Color: Blue anodized finish for easy identification and corrosion resistance
- Outer Dimensions: 14 mm (diameter) × 25 mm (length)
- Available Bore Sizes: 5×5 mm / 5×8 mm / 6×8 mm / 8×8 mm
- Compatible Motor: 42 mm NEMA 17 stepper motor (standard 3D printer / CNC motor)
- No assembly required – ready to install straight out of the package
- Connects two shafts of equal or different diameters with secure set-screw clamp
- Ideal for 3D printers, laser engravers, CNC machines, model boats, model cars, and other DIY mechanical projects
Specifications
| Item Type | Flexible Shaft Coupler |
| Material | Aluminum Alloy |
| Outer Diameter × Length | 14 × 25 mm (approx. 0.55 × 0.98 in) |
| Bore Options | 5×5 mm / 5×8 mm / 6×8 mm / 8×8 mm |
| Color | Blue |
| Quantity | 1 pc |
| Assembly Required | No |
| Country of Origin | Mainland China |
Package Includes
- 1 × Aluminum Flexible Shaft Coupler
Note: Due to manual measurement, please allow a tolerance of 0–1 cm. Slight color variation may occur due to lighting and display settings.
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Frequently Asked Questions
Q: What bore sizes does this aluminum shaft coupler come in?
A: This flexible shaft coupler is available in four bore size combinations: 5×5 mm, 5×8 mm, 6×8 mm, and 8×8 mm, making it compatible with a wide range of stepper motor and lead screw shaft diameters used in 3D printers and CNC machines.
Q: Is this coupler compatible with NEMA 17 stepper motors?
A: Yes. The coupler is specifically designed for 42 mm (NEMA 17) stepper motors, the most common motor size used in 3D printers, engraving machines, and DIY CNC builds.
Q: How does the flexible shaft coupler handle misaligned shafts?
A: The helical-cut flexible section of the coupler absorbs angular and parallel misalignment between the motor shaft and the driven shaft, ensuring smooth, accurate power transmission without putting stress on bearings or motor axes.
Q: Does this coupler require any tools or assembly before use?
A: No assembly is required. Simply slide the coupler onto the motor shaft and lead screw, then tighten the set screws with a standard hex key (Allen wrench) to secure it in place — it is ready to use right out of the package.
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.