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When shaft misalignment causes vibration, noise, or premature bearing wear in your CNC machine, pump, or motor drive, a rigid coupling simply transfers the problem downstream. Engineers and machine builders who need a forgiving, maintenance-friendly connection between two shafts rely on spider jaw flexible couplings to absorb angular, parallel, and axial misalignment without sacrificing torque transmission.
This flexible shaft coupler features two aluminum alloy hubs and a polyurethane spider insert (jaw element). The outer diameter is 80 mm (≈3.15 in) and the overall length is 114 mm (≈4.49 in). Each hub accepts a bore from 14 mm up to 45 mm (≈0.55–1.77 in), with keyway or set-screw clamping depending on the bore combination selected. The spider insert sits between the jaw teeth of both hubs, cushioning shock loads and dampening torsional vibration.
Typical use cases include stepper and servo motor-to-leadscrew connections on CNC routers and lathes, pump-to-motor shaft coupling in fluid transfer systems, and general industrial drive-line applications where a flexible shaft coupler for 14–45 mm bore shafts is required. The jaw-type design also allows quick spider replacement without disturbing shaft alignment.
| Coupling Type | Spider Jaw (Plum / Claw) Flexible Coupling |
|---|---|
| Outer Diameter (OD) | 80 mm (≈3.15 in) |
| Overall Length (L) | 114 mm (≈4.49 in) |
| Bore Range (d1 / d2) | 14–45 mm (≈0.55–1.77 in) per hub |
| Hub Material | Aluminum alloy |
| Spider Insert Material | Polyurethane (PU) |
| Misalignment Compensation | Angular, parallel, and axial |
| Bore Clamping | See variant options |
| Weight | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 pc (multi-pack options available) |
Measure the outer diameter of each shaft you need to connect. Select the variant that matches your d1 (motor/driver side) and d2 (driven side) shaft diameters. If both shafts are the same size, choose a same-bore variant (e.g., d20×d20). If they differ, choose the mixed-bore option that covers both diameters (e.g., d14×d30). Bore sizes range from 14 mm to 45 mm per hub.
The polyurethane spider insert allows the coupling to accommodate angular misalignment (shafts at a slight angle), parallel (radial) misalignment (shafts offset side-by-side), and axial misalignment (shafts slightly too close or too far apart). For best service life, keep misalignment within the manufacturer's rated tolerance and align shafts as accurately as possible during installation.
Yes. The aluminum alloy hubs keep rotational inertia low, which is important for stepper and servo motor responsiveness and positioning accuracy. The spider jaw design also dampens torsional vibration, helping to reduce resonance that can affect encoder feedback. This coupling is widely used on CNC routers, lathes, and 3D printer lead-screw drives.
Torque capacity depends on the spider insert durometer and the specific bore/clamping configuration. For the D80×L114 size class, typical rated torque is in the range of 50–120 N·m depending on the spider grade. Contact us to confirm the rated torque for your specific variant before use in high-load applications.
Yes — that is one of the key advantages of the jaw-type design. The polyurethane spider sits between the jaw teeth of the two hubs. By sliding the hubs slightly apart along their respective shafts (or loosening set screws just enough to create axial clearance), the worn spider can be removed and a new one inserted without full disassembly. This significantly reduces maintenance downtime.
The aluminum alloy hubs offer good resistance to oxidation and light moisture exposure typical of workshop and light industrial environments. The polyurethane spider is also resistant to oils and mild chemicals. For continuous immersion or highly corrosive environments, contact us to discuss material options or protective coatings.
Same-bore variants (e.g., d20×d20) have identical bore diameters on both hubs and are used when both shafts are the same size. Mixed-bore variants (e.g., d14×d30) have different bore diameters on each hub, allowing you to directly couple two shafts of different diameters without a separate adapter or reducer bushing. Select the variant that matches your specific shaft combination.
