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When shaft misalignment, vibration, or backlash disrupts your CNC router, stepper motor drive, or 3D printer axis, the coupling is often the first component to blame — and the easiest to fix. These flexible plum spider jaw shaft couplings are engineered for DIY builders, machine retrofitters, and motion-control engineers who need reliable torque transmission without sacrificing flexibility or precision.
Each coupling consists of two aluminum alloy hubs and a polyurethane (PU) spider insert. The outer diameter ranges from 14 mm to 105 mm (approximately 0.55 in to 4.13 in), with lengths from 22 mm to 140 mm (approximately 0.87 in to 5.51 in). Bore diameters are available across a wide range — see variant options for exact bore sizing. The spider element is available in standard elasticity grades suited to general motion-control applications.
Typical use cases include Z-axis and lead-screw couplings on desktop CNC mills, stepper motor shaft connections on 3D printer gantry systems, and servo motor drives on laser engravers or plasma tables. The jaw-and-spider design makes these flexible plum couplings a go-to choice for low-backlash shaft coupling in DIY automation and light industrial motion systems.
| Coupling Type | Jaw / Spider (Plum) Flexible Coupling |
|---|---|
| Hub Material | Aluminum Alloy |
| Spider / Insert Material | Polyurethane (PU) |
| Outer Diameter (D) | 14 mm – 105 mm (0.55 in – 4.13 in) |
| Overall Length (L) | 22 mm – 140 mm (0.87 in – 5.51 in) |
| Bore Diameter | See variant options |
| Clamping Method | Set Screw |
| Misalignment Tolerance | See variant options |
| Surface Finish | Natural Anodized / Mill Finish |
| Quantity per Order | 1 pcs (per variant) |
Match the outer diameter (D) and length (L) to your motor flange clearance and shaft-to-shaft distance. More importantly, confirm the bore diameter matches your motor shaft and lead screw shaft. The "Bore Remarks" option on this listing means bore sizes vary by dimension — contact us or check the variant detail to confirm the available bore range for your chosen D×L size.
Compatible bore diameters vary by coupler dimension. Smaller sizes (e.g., D14×L22) typically accommodate shafts from 3 mm to 8 mm, while larger sizes (e.g., D105×L140) can accept shafts up to 40 mm or more. Please confirm the bore range for your selected variant before ordering — select "Bore Remarks" and contact us with your shaft diameter for exact confirmation.
Yes. The polyurethane spider insert allows the jaw coupling to absorb angular misalignment (typically up to 1°), parallel offset, and axial displacement. This makes it well-suited for CNC and 3D printer applications where perfect shaft alignment is difficult to achieve during assembly. For heavy misalignment, consider a beam or Oldham coupling instead.
These flexible plum spider jaw couplings are designed for low-to-medium speed motion-control applications typical of CNC routers, 3D printers, and stepper/servo motor drives. For very high RPM applications (above approximately 3,000 RPM), verify the specific size's rated speed with us before ordering, as larger diameter couplings have lower maximum speed ratings.
The hubs are machined from aluminum alloy, which provides a strong, rigid connection under the torque loads typical of NEMA 17 and NEMA 23 stepper motors and equivalent servo drives. The spider insert acts as the sacrificial element — it absorbs shock and vibration before the hubs or motor shafts are stressed. For very high-torque industrial drives, contact us to confirm the torque rating for your selected size.
Yes — this is one of the key advantages of the jaw coupling design. The polyurethane spider insert slides out radially once the two hubs are slightly separated, so you can swap the insert without loosening the set screws or removing the hubs from the shafts. This makes maintenance fast and minimizes machine downtime.
"D" refers to the outer diameter of the coupling body, and "L" refers to the total assembled length. A larger D generally means a higher torque capacity and larger bore range. A longer L provides more axial flexibility and is useful when the shaft-to-shaft gap is larger. Choose the smallest D that accommodates your bore diameter to keep rotating mass low and response fast.
