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When a misaligned or rigid shaft connection causes your stepper motor to skip steps, vibrate, or lose positional accuracy, the culprit is almost always the coupling. Engineers, hobbyists, and machine builders who demand repeatable motion control need a flexible shaft coupling that absorbs angular and parallel misalignment without transmitting shock loads back to the motor bearings.
These flexible shaft couplings are machined from aluminum alloy with an anodized finish, featuring a helical-cut body that provides torsional flexibility while maintaining rotational stiffness. Available in two outer diameter series — D 25mm × L 30mm (≈0.98" × 1.18") and D 40mm × L 50mm (≈1.57" × 1.97") — with bore combinations (d1 × d2) ranging from 5mm up to 20mm (≈0.20"–0.79") to suit metric and inch shafts. Two clamping styles are offered: Clamp type (split-collar) and Set Screw type, sold individually (1 Pcs) or in packs of 5 Pcs.
Typical use cases include NEMA 17/23 stepper motor to lead-screw connections on desktop CNC routers, Z-axis couplings on FDM 3D printers such as Ender and Prusa derivatives, and encoder shaft connections on servo-driven automation rigs where low backlash flexible shaft coupling performance is critical.
Choose Clamp (split-collar) for tool-free shaft changes or Set Screw for a more compact, vibration-resistant grip — both styles available across the full bore range.
Bore combinations from 5mm × 5mm up to 20mm × 20mm, including 6.35mm (1/4") and 12.7mm (1/2") inch-standard sizes, covering the most common stepper motor and lead-screw shaft diameters.
The spiral slot design accommodates angular misalignment (typically up to 1°–3°) and parallel offset while maintaining low backlash — protecting motor bearings from radial loads.
Lightweight yet rigid aluminum construction keeps rotational inertia low — an important factor for high-acceleration stepper motor applications like 3D printer extruder drives.
Order 1 Pcs for a single-axis build or 5 Pcs for multi-axis CNC machines, spare-parts kits, or classroom robotics projects — priced to scale with your build.
D 25mm × L 30mm suits compact NEMA 17 builds; D 40mm × L 50mm handles larger NEMA 23 or industrial stepper motor shafts with higher torque requirements.
| Product Type | Flexible Shaft Coupling (Jaw / Helical-cut) |
|---|---|
| Clamping Style | Clamp (split-collar) or Set Screw — see variant options |
| Outer Diameter (D) | 25mm (≈0.98") or 40mm (≈1.57") — see variant options |
| Length (L) | 30mm (≈1.18") or 50mm (≈1.97") — see variant options |
| Bore d1 × d2 | 5–20mm range; includes 6.35mm & 12.7mm inch sizes — see variant options |
| Material | Aluminum alloy |
| Finish | Anodized |
| Quantity per Order | 1 Pcs or 5 Pcs — see variant options |
| Angular Misalignment Tolerance | Typically 1°–3° (helical-cut design) |
| Radial Misalignment Tolerance | See variant options |
| Application | CNC routers, 3D printers, stepper motor drives, encoders |
Measure the output shaft diameter of your stepper motor (d1) and the input shaft of your lead screw or encoder (d2). Select the bore combination that matches both. Common NEMA 17 motor shafts are 5mm; NEMA 23 shafts are typically 6.35mm (1/4") or 8mm. Lead screws are often 8mm or 10mm. If your shafts are the same diameter, choose a symmetric bore (e.g., 8mm × 8mm).
The Clamp (split-collar) type uses a bolt to compress the coupling around the shaft, distributing clamping force evenly — ideal for frequent shaft changes and softer shaft materials. The Set Screw type uses one or two grub screws that press directly against the shaft; it is more compact and resists vibration loosening, but can mark soft shafts. For most 3D printer and CNC applications, either style works well.
The D 40mm × L 50mm series is sized for NEMA 23 and similar larger stepper motors. Aluminum helical couplings in this size range typically handle torques of 5–15 Nm depending on bore size and clamping style. For very high-torque applications, confirm your specific torque requirement against the coupling's rated capacity before ordering.
Yes. Both 6.35mm (1/4") and 12.7mm (1/2") bore options are available in the variant selector, making these couplings compatible with inch-standard shafts commonly found in North American CNC and robotics hardware alongside metric stepper motor shafts.
The helical-cut design typically accommodates angular misalignment of 1°–3° and small amounts of parallel (radial) offset. It is not designed for large axial displacement. For best results, align shafts as closely as possible during installation — the coupling compensates for minor residual misalignment, not gross misalignment.
These couplings are designed for stepper motor and servo motor shaft connections operating at low-to-moderate speeds (typically under 3,000 RPM). For high-speed spindle applications above 3,000 RPM, a dynamically balanced coupling is recommended. For CNC router axis drives and 3D printer Z/X/Y axes, these couplings are well-suited.
Yes — that is the purpose of the asymmetric bore options (e.g., 5mm × 8mm, 10mm × 12mm). Select the bore combination where d1 matches your motor shaft and d2 matches your lead screw or driven shaft. The full list of available bore combinations is shown in the variant selector above.
