Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Misaligned shafts and vibration-induced wear are among the most common causes of premature motor and pump failure — a frustrating problem for CNC builders, machine retrofitters, and industrial maintenance engineers. The D65xL90 Spider Jaw Shaft Coupler is engineered to absorb angular, parallel, and axial misalignment while transmitting torque smoothly, protecting your drivetrain from shock loads and resonance damage.
This flexible coupling set consists of two precision-machined aluminum alloy hubs and a polyurethane spider insert (plum element). The overall body diameter is 65mm (≈2.56 in) and the assembled length is 90mm (≈3.54 in). Bore diameters φd1 and φd2 are available in matched and mixed combinations ranging from 14mm to 38mm (≈0.55–1.50 in), with set-screw clamping for secure shaft retention.
Typical applications include CNC router and laser engraver spindle drives, servo and stepper motor-to-leadscrew connections, centrifugal pump shaft couplings, and general industrial power transmission where flexible jaw couplings are specified. The splined plum insert design makes this a direct replacement for standard spider-type flexible couplings in automation and motion-control systems.
| Body Diameter (D) | 65 mm (≈ 2.56 in) |
|---|---|
| Assembled Length (L) | 90 mm (≈ 3.54 in) |
| Bore Diameter φd1 | See variant options |
| Bore Diameter φd2 | See variant options |
| Bore Range | 14 mm – 38 mm (≈ 0.55 – 1.50 in) |
| Hub Material | Aluminum alloy |
| Spider Insert Material | Polyurethane (PU) |
| Coupling Type | Spider jaw / plum flexible coupling |
| Shaft Retention | Set-screw clamping |
| Misalignment Tolerance | See variant options |
| Quantity per Set | 1 Pcs (2 hubs + 1 spider insert) |
| Finish | Natural anodized / machined aluminum |
Measure the outer diameter of each shaft you need to connect — one for φd1 and one for φd2. If both shafts are the same diameter, select a matched bore option (e.g., 20mm * 20mm). If the motor shaft and driven shaft differ, choose the corresponding mixed bore combination (e.g., 14mm * 20mm). Always verify with calipers before ordering.
Yes. The polyurethane spider insert is designed to accommodate small degrees of angular, parallel, and axial misalignment between the two connected shafts. For best results, align shafts as closely as possible during installation — the flexible element compensates for residual misalignment and absorbs vibration, but is not a substitute for proper alignment.
Yes. The D65xL90 spider jaw coupler is widely used in CNC router, laser engraver, and 3D printer builds to connect stepper or servo motor shafts to leadscrews or ballscrews. The flexible insert reduces backlash-inducing vibration and protects motor bearings from axial loads.
The spider (plum) insert is made from polyurethane (PU), which offers a balance of flexibility, wear resistance, and chemical resistance. The insert is a separate component that sits between the two hubs and can typically be replaced independently when worn, without replacing the aluminum hubs.
No keyway is required. Each hub is secured to the shaft using radial set screws, making installation straightforward on plain round shafts. If your shaft has an existing keyway, the set screws can still be used; contact us to confirm compatibility with keyed shaft configurations.
The D65 body diameter and L90 length make this coupler suitable for medium-duty applications with larger motor frames (e.g., NEMA 34 or equivalent metric frames) and pump shafts up to 38mm. Smaller couplers (D19, D25, D32) are better suited to NEMA 17/23 motors and lighter loads. Choose based on your shaft diameter range and the torque requirements of your application.
Each order for "1 Pcs" includes one complete coupling set: two aluminum alloy hubs (one per shaft end) and one polyurethane spider insert. This is everything needed to couple two shafts together.
