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Misaligned motor shafts and rigid couplings are a leading cause of premature bearing failure and vibration noise in DIY CNC machines, 3D printers, and small automation rigs. Engineers and makers who need a forgiving, zero-backlash connection between two shafts of the same or different diameters rely on jaw-type flexible couplers with a polyurethane spider insert to absorb shock and compensate for minor angular and parallel misalignment.
Each set consists of two aluminum alloy hubs and one polyurethane spider (jaw) insert. The D14 series measures 14 mm outer diameter × 22 mm length, accepting bore diameters from 3 mm to 8 mm (approximately 0.12–0.31 in). The D20 series measures 20 mm outer diameter in lengths of 25 mm or 30 mm, accepting bore diameters from 4 mm to 10 mm (approximately 0.16–0.39 in). Hubs are secured via set screws; no adhesive or press-fit required.
Typical applications include stepper motor-to-leadscrew connections on CNC routers and laser engravers, servo motor shaft couplings on pick-and-place machines, and encoder shaft connections on test benches where vibration damping and easy disassembly are essential for long-term reliability.
Two interlocking aluminum hubs grip the spider insert from both sides, creating a positive mechanical connection that transmits torque while allowing up to ±1° angular and ~0.2 mm parallel misalignment compensation.
The elastomeric spider absorbs shock loads and dampens vibration between connected shafts, protecting motor bearings and reducing audible noise in continuous-duty applications.
Available in same-bore and mixed-bore configurations (e.g., d3×d8, d5×d10), letting you couple shafts of different diameters without adapters. Select your exact d1 × d2 combination from the variant menu.
The compact D14 × L22 mm hub suits space-constrained enclosures; the D20 series in L25 mm and L30 mm lengths handles higher torque loads and larger shaft diameters up to 10 mm.
Each hub is secured with a radial set screw, allowing tool-free shaft swaps during prototyping and maintenance without damaging shaft surfaces.
Lightweight yet rigid aluminum alloy construction keeps rotational inertia low — critical for high-acceleration stepper and servo motor applications where response time matters.
| Product Type | Jaw / Spider Flexible Shaft Coupling |
|---|---|
| Hub Material | Aluminum Alloy |
| Spider / Insert Material | Polyurethane (PU) |
| Outer Diameter (OD) | D14 mm or D20 mm (see variant options) |
| Coupling Length | L22 mm (D14 series) / L25 mm or L30 mm (D20 series) |
| Bore Diameter d1 | 3–10 mm (see variant options) |
| Bore Diameter d2 | 3–10 mm (see variant options) |
| Bore Combination | Same-bore or mixed-bore (see variant options) |
| Fastening Method | Radial Set Screw |
| Misalignment Tolerance | Angular: typically ±1°; Parallel: typically ≤0.2 mm |
| Finish | Natural / Anodized Aluminum |
| Quantity per Set | 2 pcs (2 hubs + 1 spider insert) |
Choose D14 × L22 mm if your shaft diameters are 3–8 mm and you need a compact coupler for tight spaces such as 3D printer Z-axis assemblies. Choose D20 × L25 mm or D20 × L30 mm if your shafts are 4–10 mm and you need higher torque capacity or a longer coupling body for easier alignment. When in doubt, the D20 series offers more clamping surface and is generally preferred for NEMA 23 motors and larger leadscrews.
Yes. These couplers are available in mixed-bore configurations — for example, d3 × d8 or d5 × d10 — so you can connect a motor shaft and a leadscrew that have different diameters without using a reducer or adapter. Simply select the d1 × d2 combination that matches your two shaft sizes from the variant dropdown.
The set screw on each hub bites directly into the shaft, providing a positive mechanical lock. The polyurethane spider transmits torque through interlocking jaw fingers rather than friction alone, so the connection does not rely on adhesive or interference fit. For typical stepper and servo motor loads in CNC and automation applications, the clamping force of the set screw is sufficient. Ensure the set screw is tightened to the manufacturer's recommended torque and that the shaft surface is clean and free of oil.
The aluminum alloy hubs offer good natural oxidation resistance and are suitable for indoor workshop and light industrial environments. For prolonged exposure to moisture, salt spray, or corrosive chemicals, consider applying a thin coat of anti-corrosion spray to the hub exterior. The polyurethane spider insert is inherently resistant to oils and mild solvents.
These jaw couplers are widely used with NEMA 17 stepper motors (typically 5 mm shaft), NEMA 23 stepper motors (typically 6.35 mm or 8 mm shaft), small DC gear motors, servo motors, and encoder shafts in CNC routers, laser engravers, 3D printers, pick-and-place machines, and general automation rigs. Always verify your motor shaft diameter and leadscrew bore before selecting a variant.
Slide each hub onto its respective shaft, align the hub face to the desired position, and tighten the set screw with an appropriate hex key (Allen wrench). Insert the polyurethane spider between the two hubs by pressing the jaw fingers into the mating slots — no tools required for the spider. To remove, loosen the set screws and slide the hubs off. The spider can be replaced independently if worn without replacing the aluminum hubs.
Each order includes 2 aluminum alloy hubs and 1 polyurethane spider insert (jaw element), forming one complete flexible coupling assembly. The quantity listed in the variant selector (2 pcs) refers to this complete set of 2 hubs + 1 spider.
