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Misaligned shafts and vibration-induced positioning errors are a constant headache for CNC builders, 3D printer enthusiasts, and automation engineers. This flexible plum spider jaw coupling is engineered for DIYers and professionals who need a reliable, zero-backlash connection between motor shafts and lead screws — without the rigidity that causes premature bearing wear.
Each coupler consists of two aluminum alloy hubs and a polyurethane spider insert. Available in outer diameters from 25mm to 40mm (approx. 0.98" to 1.57") and lengths from 30mm to 66mm (approx. 1.18" to 2.60"), with shaft bore options spanning 6.35mm, 8mm, 12mm, and 17mm to suit a wide range of motor and lead screw combinations.
Ideal for CNC router Z-axis lead screw connections, NEMA stepper motor shaft coupling on 3D printers, and servo motor to encoder shaft alignment in automation panels — all scenarios where angular and parallel misalignment compensation is critical.
The polyurethane spider element absorbs torsional shock and vibration between hubs, protecting motor bearings and reducing positioning noise in CNC and 3D printing applications.
Shaft bore options of 6.35mm, 8mm, 12mm, and 17mm cover the most common stepper and servo motor output shaft diameters, eliminating the need for adapters.
Both hubs are machined from aluminum alloy and secured with radial set screws, providing a firm grip on the shaft without permanent deformation or slippage under load.
The jaw coupling design accommodates angular, parallel, and axial misalignment between connected shafts — reducing stress on motor bearings and extending drivetrain service life.
Order 1, 2, 3, or 5 units per listing to stock your workshop or complete multi-axis builds without separate orders.
The lightweight aluminum construction keeps rotational inertia low, ensuring fast motor response and accurate positioning — essential for high-speed CNC and pick-and-place systems.
| Product Type | Flexible Plum Spider Jaw Coupling |
|---|---|
| Hub Material | Aluminum Alloy |
| Spider Insert Material | Polyurethane (PU) |
| Outer Diameter (D) | D25mm / D30mm / D40mm (See variant options) |
| Coupler Length (L) | L30mm / L35mm / L40mm / L45mm / L66mm (See variant options) |
| Shaft Bore Diameter | 6.35mm / 8mm / 12mm / 17mm (See variant options) |
| Fastening Method | Radial Set Screws |
| Misalignment Tolerance | Angular: typically ±1°; Parallel: typically 0.2–0.5mm |
| Finish | Natural Anodized Aluminum |
| Quantity per Order | 1 / 2 / 3 / 5 (See variant options) |
Match the shaft bore to your motor's output shaft diameter (e.g., NEMA 17 typically uses 5mm or 6.35mm, NEMA 23 uses 6.35mm or 8mm, NEMA 34 uses 12mm or 14mm). Then select the outer diameter (D) and length (L) based on the available space in your machine's motor mount area. Larger D and L values generally handle higher torque.
Yes. Each hub is bored independently, so you can connect two shafts of the same diameter (e.g., 8mm to 8mm) or two different diameters (e.g., 6.35mm to 12mm) depending on the variant you select. Check the Shaft Diameter option when adding to cart.
The polyurethane spider insert sits between the two hubs and can typically be replaced without replacing the entire coupler. However, replacement inserts are sold separately. Contact us to confirm availability for your specific coupler size.
Torque capacity varies by coupler size. Larger diameter couplers (D40mm) handle significantly more torque than smaller ones (D25mm). For typical CNC and 3D printer stepper motor applications (holding torque up to ~3 Nm for NEMA 23), the D30mm and D40mm variants are well-suited. Contact us to confirm for high-torque servo applications.
The aluminum alloy hubs have a natural anodized finish that provides moderate corrosion resistance suitable for indoor workshops, enclosed CNC enclosures, and light-duty outdoor use. For harsh chemical or salt-spray environments, additional protective coating is recommended.
Slide each hub onto its respective shaft, align the coupler so the spider insert seats evenly between both hubs, then tighten the set screws with an appropriate hex key (Allen wrench). Apply moderate torque — over-tightening can deform the shaft bore. Ensure the shaft is fully inserted to the hub's depth before tightening.
Yes. T8 lead screws have an 8mm outer diameter and T12 lead screws have a 12mm outer diameter, both of which are available as shaft bore options in this listing. Pair with the matching motor shaft bore on the other hub for a direct, adapter-free connection.
🛒 Select your Coupler Dimension, Shaft Diameter, and Amount above, then add to cart.
