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When misalignment between motor and driven shaft causes vibration, noise, or premature bearing wear, engineers and CNC builders need a coupling that absorbs shock without sacrificing torque transmission. The D45xL66mm spider jaw coupling is designed for machinists, automation integrators, and DIY CNC builders who demand dimensional accuracy and long service life from every drivetrain component.
This coupling consists of two aluminum alloy hubs (OD 45mm, overall length 66mm) and a polyurethane spider insert. Bore sizes range from 8mm to 25mm (approximately 0.31 in to 0.98 in) for both d1 and d2, selectable independently per variant. The jaw-and-spider design accommodates angular, parallel, and axial misalignment while dampening vibration between connected shafts.
Typical applications include CNC router Z-axis and spindle drives, servo and stepper motor couplings for 3D printers and laser engravers, and light-duty pump or encoder shaft connections where zero-backlash transmission and easy bore customization are required.
| Coupling Type | Spider Jaw (Plum / Claw) Coupling |
|---|---|
| Outer Diameter (OD) | 45mm (1.77 in) |
| Overall Length | 66mm (2.60 in) |
| Bore Range (d1 & d2) | 8mm – 25mm (0.31 in – 0.98 in) |
| Hub Material | Aluminum Alloy |
| Spider Insert Material | Polyurethane (PU) |
| Shaft Fixing Method | Set Screw |
| Angular Misalignment | See variant options |
| Parallel Offset Tolerance | See variant options |
| Surface Finish | Natural / Anodized Aluminum |
| Weight | See variant options |
Measure the shaft diameter of your motor (d1) and the driven shaft (d2) with a caliper. Select the variant that matches both diameters. If both shafts are the same size, choose a same-bore variant (e.g., d8–d8). If they differ, select the stepped variant that matches your exact combination.
This coupling is suited for light-to-medium duty CNC and motion control applications typical of NEMA 17 and NEMA 23 stepper motors. For high-torque servo applications, verify the rated torque of the coupling against your motor's peak torque output before installation.
Yes. The polyurethane spider insert sits between the two hubs and can be slid out and replaced without loosening the set screws or removing the hubs from the shafts, making maintenance straightforward.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop conditions. For environments with exposure to cutting fluids or high humidity, periodic inspection is recommended. The hubs are not rated for immersion or outdoor use.
The bore sizes listed are metric (mm). If your shaft is imperial, convert the diameter to millimeters and select the closest available bore. For example, a 3/8" shaft (9.525mm) would typically use the 10mm bore variant with a shim, or contact us to confirm the best fit.
A rigid coupling transmits torque with zero compliance but requires near-perfect shaft alignment. A jaw (spider) coupling like this one tolerates small angular and parallel misalignment and absorbs vibration, making it more forgiving during assembly and better at protecting motor bearings from shock loads in CNC applications.
Insert each hub onto its respective shaft, position the spider insert between the jaws of both hubs, then tighten the set screws to the recommended torque for your shaft diameter. Ensure the spider is fully seated in all jaw slots before applying load. Check alignment after tightening.
