Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When misalignment between motor shafts causes vibration, noise, or premature bearing wear, the right shaft coupling makes all the difference. Engineers, hobbyists, and CNC builders who need a reliable, low-backlash connection between two rotating shafts will find this color-coded aluminum alloy flexible shaft coupling an indispensable addition to their drive system toolkit.
Each coupling is machined from aluminum alloy and features a two-piece clamp design with a helical cut that provides flexibility while transmitting torque. Bore diameters range from 2 mm (approx. 0.079 in) to 10 mm (approx. 0.394 in) across the full size range, with outer diameters typically 19–34 mm (approx. 0.75–1.34 in) depending on the selected variant. The color coding — dark red, dark blue, and light blue — corresponds to bore-size groupings, making it easy to identify the correct coupling at a glance.
Typical use cases include stepper motor to lead-screw connections on 3D printers and CNC routers, servo motor shaft coupling for robotic arms and automation rigs, and encoder-to-shaft coupling in precision measurement or feedback systems where low backlash and easy installation are critical.
| Material | Aluminum alloy |
|---|---|
| Coupling Type | Helical-cut flexible / rigid clamp |
| Bore Diameter (D1) | See variant options |
| Bore Diameter (D2) | See variant options |
| Outer Diameter | See variant options |
| Overall Length | See variant options |
| Color / Size Group | Dark red (2–3.17 mm), Dark blue (4–5 mm), Light blue (6–8 mm) |
| Shaft Retention | Set screw clamp |
| Finish | Anodized aluminum |
| Pack Quantity | 1 / 2 / 5 / 10 / 20 pcs (select above) |
Measure the outer diameter of both shafts you need to connect — your motor shaft (D1) and your driven shaft (D2). Select the variant whose D1 × D2 bore combination matches those measurements exactly. If both shafts are the same diameter, choose a same-bore variant (e.g., 5 mm × 5 mm). If they differ, choose a mixed-bore variant (e.g., 5 mm × 8 mm).
Yes. The helical slot machined into the coupling body allows a small degree of angular and parallel misalignment — typically up to approximately 1°–3° angular and 0.1–0.3 mm parallel offset, depending on the coupling size. This makes it suitable for applications where perfect shaft alignment is difficult to achieve, such as hand-assembled CNC frames or 3D printer Z-axis assemblies.
The aluminum alloy construction keeps rotational inertia low, making these couplings well-suited for moderate-speed applications such as stepper and servo motor drives. For very high-speed spindle applications (above approximately 3,000–5,000 RPM), verify that the coupling's balance and bore tolerance meet your system's requirements before use.
Set screws can loosen under sustained vibration if not properly secured. It is recommended to apply a small amount of thread-locking compound (such as medium-strength Loctite) to the set screws during installation, especially in applications with continuous vibration or frequent direction reversals. Periodically inspect and re-torque the set screws as part of routine maintenance.
The color coding indicates the bore size group: dark red couplings cover bore diameters from 2 mm to 3.17 mm, dark blue couplings cover 4 mm to 5 mm bores, and light blue couplings cover 6 mm to 8 mm bores. The color makes it easy to identify the correct size group at a glance when working with multiple coupling sizes in the same workspace.
Yes — this is one of the most common use cases. Select the bore combination that matches your stepper motor shaft diameter (commonly 5 mm for NEMA 17 motors) and your lead screw diameter (commonly 5 mm or 8 mm). The helical-cut design accommodates minor misalignment between the motor and lead screw, which is typical in DIY CNC and 3D printer builds.
Each listing offers packs of 1, 2, 5, 10, or 20 pieces. Select the quantity that matches your project needs — single pieces are ideal for prototyping or replacement, while 10- or 20-piece packs offer better per-unit value for production runs, classroom kits, or stocking a repair bench.
