Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When misalignment, vibration, or shaft size differences cause premature wear on your motors and drives, a reliable flexible coupler becomes essential. Engineers, CNC builders, and 3D printer enthusiasts working with stepper motors, servo drives, and lead screws need a jaw coupling that absorbs shock without sacrificing torque transmission accuracy.
This jaw shaft coupling spider flexible coupler features an aluminum alloy body (two hubs) with an outer diameter of 25mm (≈ 0.98 in) and is available in lengths of 30mm (≈ 1.18 in) and 35mm (≈ 1.38 in). Bore sizes d1 and d2 are independently selectable from 4mm to 12mm (≈ 0.16–0.47 in), accommodating same-bore and stepped-bore shaft combinations across the full range.
Typical use cases include connecting stepper motor shafts to lead screws in CNC routers and 3D printers, coupling servo motor outputs to encoder shafts in automation panels, and joining misaligned drive shafts in light-duty conveyor and robotics applications where a flexible shaft coupler with spider insert is required.
Both coupling halves are machined from aluminum alloy for a lightweight yet rigid structure that resists deformation under continuous rotational load.
Choose d1 and d2 independently from 4mm to 12mm — same-bore or stepped configurations — making this coupler compatible with a wide range of motor and shaft diameter pairings.
The elastomeric spider insert absorbs vibration and compensates for minor angular and parallel misalignment, protecting motor bearings and extending drivetrain service life.
Select 30mm or 35mm overall length to match your shaft overlap requirements and available installation space without custom machining.
Each hub is secured to the shaft via set screws, providing a firm, slip-resistant connection suitable for bidirectional rotation and moderate torque applications.
Designed for CNC routers, 3D printers, laser engravers, stepper and servo motor drives, and light-duty conveyor systems where a flexible jaw coupler with spider insert is the standard solution.
| Coupling Type | Jaw / Spider (Claw) Flexible Coupling |
|---|---|
| Outer Diameter (OD) | 25mm (≈ 0.98 in) |
| Overall Length | 30mm (≈ 1.18 in) or 35mm (≈ 1.38 in) — see variant options |
| Bore d1 Range | 4mm – 12mm (≈ 0.16–0.47 in) |
| Bore d2 Range | 4mm – 12mm (≈ 0.16–0.47 in) |
| Hub Material | Aluminum Alloy |
| Spider Insert Material | Polyurethane (PU) Elastomer |
| Shaft Fastening | Set Screw |
| Misalignment Compensation | Angular & Parallel (minor) |
| Finish | Natural / Anodized Aluminum |
| Unit Weight | Approx. 30–60g (varies by bore and length) |
| Quantity per Order | 1 piece |
Measure the outer diameter of each shaft you need to connect. Select d1 to match your motor shaft diameter and d2 to match your lead screw or driven shaft diameter. Both d1 and d2 can be set independently anywhere from 4mm to 12mm, so stepped-bore combinations (e.g., d1=5mm, d2=8mm) are fully supported.
The only difference is the overall length of the coupling body: 30mm vs. 35mm. A longer body provides slightly more shaft engagement depth per hub, which can be useful when shaft stub lengths are generous. Choose based on the available shaft insertion length and your installation clearance.
Yes. The polyurethane spider insert between the two aluminum hubs accommodates minor angular and parallel misalignment. For best results, keep misalignment within the manufacturer's rated tolerance — excessive misalignment will accelerate spider wear. This coupler is not designed for large offset applications.
Yes. The D25 jaw coupling is a standard choice for connecting NEMA 17 and NEMA 23 stepper motor shafts (typically 5mm or 6.35mm) to lead screws (typically 8mm or 10mm) in CNC and 3D printer builds. Confirm your specific shaft diameters before ordering and select the matching d1 × d2 bore combination.
The aluminum alloy hubs offer good resistance to oxidation in typical indoor workshop and industrial environments. For high-humidity or wet environments, consider applying a light protective coating. The polyurethane spider insert is resistant to oils and mild chemicals commonly found in workshop settings.
Insert each shaft into the corresponding hub bore to the recommended depth, align the spider insert between the two hub jaws, then tighten the set screws securely against the shaft flat (if present) or shaft surface. Ensure both shafts are as co-axial as possible before final tightening to minimize spider wear and vibration.
The spider insert is a separate elastomeric element seated between the two hubs. In many jaw coupling designs the spider can be replaced without disassembling the entire drivetrain — simply loosen the set screws, slide the hubs apart, swap the spider, and reassemble. Check that the replacement spider matches the jaw geometry of these D25 hubs.
