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When misalignment, vibration, or shock loads threaten your CNC machine's precision, a rigid coupling is the first point of failure. Engineers and machine builders who run stepper or servo motor drives need a shaft coupler that absorbs torsional shock without sacrificing torque transmission — that's exactly what this XL-series spider jaw coupling is designed to do.
Each set consists of two aluminum alloy hubs and one polyurethane plum blossom (spider) insert. Hub outer diameters range from 40 mm (≈1.57 in) to 105 mm (≈4.13 in), with hub heights ranging from 65 mm to 139 mm depending on model. The spider insert is available separately so you can replace wear components without replacing the entire coupling assembly.
Typical applications include CNC router Z-axis drives, 3D printer lead-screw couplings, laser engraver stepper motor connections, and industrial servo motor shaft-to-shaft connections where angular or parallel misalignment compensation is required.
| Product Type | Flexible Spider Jaw Shaft Coupler (XL Series) |
|---|---|
| Hub Material | Aluminum Alloy |
| Insert Material | Polyurethane (Plum Blossom / Spider) |
| Available Models | XL1, XL2, XL3, XL4, XL5, XL6 |
| Hub Outer Diameter | 40 mm / 55 mm / 65 mm / 80 mm / 95 mm / 105 mm |
| Hub Height (Coupler) | 65 mm / 77 mm / 89 mm / 112 mm / 124 mm / 139 mm |
| Bore Diameter | See variant options |
| Torque Rating | See variant options |
| Misalignment Compensation | Angular and parallel (minor offset) |
| Drive Type | Jaw / Spider (Plum Blossom) |
| Finish | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 PCS (hub set or insert, per selection) |
Match the hub outer diameter to your motor's shaft diameter and the available space in your drive assembly. XL1 (40 mm OD) suits compact stepper frames, while XL6 (105 mm OD) is intended for larger servo motor shafts. Check your motor's shaft diameter specification and select the corresponding model. If you are between sizes, choose the larger model for a more secure clamp fit.
The Shaft Coupler variant includes the two aluminum hubs — the complete coupling body that mounts onto your motor and driven shafts. The Plum Blossom Mat variant is the polyurethane spider insert only, sold as a replacement wear part. If you already have the aluminum hubs and only need to replace the elastomeric insert, select the Mat variant for your model size.
Yes. The spider jaw design compensates for minor angular misalignment (typically up to 1°) and small amounts of parallel offset. It is not intended for large misalignment — for best results, align shafts as closely as possible during installation and use the coupler's flexibility as a tolerance buffer rather than a primary alignment correction method.
Aluminum alloy hubs offer good natural oxidation resistance suitable for typical indoor workshop and light industrial environments. If your application involves exposure to cutting fluids, coolants, or high humidity, consider applying a light protective coating to the hub surfaces. The polyurethane spider insert is inherently resistant to oils and mild chemicals.
Yes. The XL spider jaw coupler is compatible with both stepper and servo motor shafts, provided the shaft diameter falls within the bore range for the selected model. It is commonly used in CNC routers, 3D printers, laser engravers, and general automation equipment. Confirm your motor's shaft diameter before ordering to ensure a correct fit.
Replacement interval depends on operating torque, speed, temperature, and duty cycle. In typical CNC and 3D printing applications, the polyurethane insert can last for extended periods under normal loads. Inspect the insert periodically for cracking, deformation, or hardening. When wear is visible or torsional play increases noticeably, replace the insert using the corresponding Plum Blossom Mat variant for your model.
Yes. The jaw-and-spider geometry transmits torque positively in both rotational directions, making it well-suited for reversing applications such as CNC axis drives and servo-controlled positioning systems. The spider insert maintains contact with both jaw faces throughout direction changes, preventing backlash-related positioning errors.
