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When misalignment, vibration, or torque shock causes premature wear on your drive train, the root cause is often a rigid coupling that cannot absorb the load. Engineers, CNC builders, and automation technicians who need a forgiving yet torsionally stiff connection between two shafts rely on a flexible jaw coupler to protect both the motor and the driven component.
This shaft coupling is machined from structural steel and fitted with a polyurethane spider insert. Two coupling styles are available — Set Screw Type and Clamp Type — in four outer-diameter series (XL0 through XL3/XL4). Outer diameters range from 30 mm (1.18 in) to 78 mm (3.07 in); lengths range from 35 mm (1.38 in) to 114 mm (4.49 in). Inner bore options span 8 mm to 50 mm (0.31 in to 1.97 in) depending on the selected size series.
Typical applications include CNC router Z-axis lead-screw connections, stepper motor to ball-screw couplings in 3D printers and laser engravers, servo motor shaft connections in pick-and-place machines, and general flexible shaft coupling for industrial automation where angular or parallel misalignment must be accommodated without transmitting shock loads to bearings.
Set Screw Type uses radial grub screws for quick installation on smooth shafts; Clamp Type uses a split-collar design for zero-backlash clamping without marring the shaft surface.
Four outer-diameter series (XL0–XL4) cover OD 30–78 mm and bore diameters from 8 mm to 50 mm, accommodating the majority of stepper motor and servo shaft standards.
Hubs are machined from structural steel, providing the rigidity needed to transmit torque reliably while the spider insert absorbs vibration and angular misalignment.
The plum-shaped elastomeric spider dampens torsional shock, reduces noise, and compensates for minor shaft misalignment — extending bearing and motor life in demanding duty cycles.
Standard equal-bore variants (d1 = d2) are stocked; unequal-bore configurations (d1 ≠ d2) can be specified by leaving a message at checkout — ideal for mixed-shaft-diameter applications.
Dimensioned to suit common CNC, 3D printer, and industrial automation shaft standards. Suitable for flexible shaft coupling in stepper motor to lead-screw assemblies and servo drive systems.
| Coupling Type | Set Screw Type / Clamp Type (see variant options) |
|---|---|
| Hub Material | Structural Steel |
| Spider Insert Material | Polyurethane (elastomeric) |
| Outer Diameter (OD) | 30 mm / 40 mm / 54 mm / 64 mm / 78 mm (see variant options) |
| Overall Length (L) | 35 mm – 114 mm (see variant options) |
| Inner Bore Range (d1 = d2) | 8 mm – 50 mm (see variant options) |
| Unequal Bore (d1 ≠ d2) | Available — leave a message at checkout |
| Surface Finish | See variant options |
| Operating Temperature | See variant options |
| Quantity per Order | 1 Pcs (per variant selected) |
The Set Screw Type uses radial grub screws that press directly against the shaft. It is compact and easy to install but can leave marks on the shaft surface. The Clamp Type uses a split-collar design that grips the shaft evenly without marring it, making it the preferred choice when you need to reposition or remove the coupling frequently, or when shaft surface integrity matters.
NEMA 17 stepper motors typically have a 5 mm output shaft. Select the XL0 series (D 30 mm) with a 5 mm bore on the motor side. If your lead screw or ball screw has a different diameter (e.g., 8 mm), choose the d1 ≠ d2 option and specify both bore sizes in your order message.
Yes. The polyurethane spider insert accommodates minor angular misalignment (typically up to 1°) and small amounts of parallel offset. For best results, align shafts as closely as possible during installation — the spider is designed to absorb residual misalignment and vibration, not to compensate for large installation errors.
The hubs are machined from structural steel. For environments with moisture or mild chemical exposure, we recommend applying a light coating of anti-corrosion grease or selecting a stainless-steel alternative if your application demands it. Contact us to confirm surface treatment options for your specific size.
Torque capacity varies by size series and coupling type. Larger OD series (XL2–XL4) carry significantly higher torque than the XL0 series. For confirmed torque ratings for your specific variant, please contact us with your size selection and application details.
Yes. Select the "d1 ≠ d2, Leave a message" variant option and specify both bore diameters in the order notes at checkout. This is useful when connecting a motor shaft of one diameter to a lead screw or encoder shaft of a different diameter.
The XL series designates the outer diameter and length of the coupling hub. XL0 (D 30 mm) is the smallest and suits light-duty CNC and 3D printer applications. XL1 (D 40 mm), XL2 (D 54 mm), XL3 (D 64 mm), and XL4 (D 78 mm) are progressively larger and handle higher torque loads. Select the series that matches your shaft bore range and torque requirement.
