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When misalignment between a motor shaft and a driven shaft causes vibration, noise, or premature bearing wear, engineers and DIY machinists need a coupling that absorbs shock without sacrificing torque transmission. This D40xL85mm spider jaw coupling is designed for CNC builders, automation integrators, and workshop technicians who demand reliable motion control in tight spaces.
The coupling consists of two aluminum alloy hubs and a polyurethane spider insert. The outer diameter is 40 mm (1.57 in) and the overall length is 85 mm (3.35 in). Bore sizes range from 14 mm to 22 mm (0.55 in – 0.87 in) on each hub, selectable independently via the variant options above. Set screws secure each hub to its respective shaft.
Typical applications include CNC router Z-axis drives, stepper motor to ballscrew connections, servo motor couplings for laser engravers, and light-duty pump or conveyor shaft connections where angular and parallel misalignment compensation is required.
| Coupling Type | Spider Jaw (Plum / Claw) |
|---|---|
| Hub Material | Aluminum Alloy |
| Spider Insert Material | Polyurethane (PU) |
| Outer Diameter (OD) | 40 mm (1.57 in) |
| Overall Length (L) | 85 mm (3.35 in) |
| Bore d1 Range | 14 – 22 mm (0.55 – 0.87 in) |
| Bore d2 Range | 14 – 22 mm (0.55 – 0.87 in) |
| Bore Combination | See variant options |
| Shaft Fastening | Set Screw |
| Misalignment Compensation | Angular, Parallel, Axial (typical for spider jaw type) |
| Finish | See variant options |
| Quantity per Order | 1 / 2 / 3 / 4 / 5 pcs (selectable) |
Measure the diameter of each shaft you need to connect using a vernier caliper. Select d1 to match your motor shaft diameter and d2 to match your driven shaft (e.g., ballscrew journal). Both bores are chosen independently from the variant dropdown. If both shafts are the same diameter, select equal d1 and d2 values.
The torque capacity of a D40 spider jaw coupling depends on the spider insert hardness and hub engagement depth. For the D40 × L85 mm size, typical rated torque is in the range of 10–25 Nm depending on spider durometer. For precise torque ratings for your application, contact us to confirm before ordering.
Spider jaw couplings of this type typically accommodate angular misalignment up to approximately 1°, parallel (radial) offset up to 0.2–0.5 mm, and limited axial float. Minimizing misalignment during installation extends spider insert life and reduces vibration.
Aluminum alloy hubs offer good natural corrosion resistance and are suitable for typical workshop, CNC, and light industrial environments. They are not recommended for prolonged immersion in aggressive chemicals or salt-spray conditions without additional surface treatment.
Yes. The spider insert is a separate elastomeric element that sits between the two hubs. If the insert wears or cracks over time, it can be replaced independently. Ensure you source a replacement spider with the same jaw count and OD as the original.
Compatibility depends on the motor shaft diameter, not the NEMA frame size. NEMA 17 motors typically have 5 mm shafts, NEMA 23 motors typically have 6.35 mm or 8 mm shafts, and NEMA 34 motors typically have 12.7 mm or 14 mm shafts. Since the minimum bore of this coupling is 14 mm, it is best suited for NEMA 34 and larger motors, or for driven shafts (ballscrews, lead screws) with journals in the 14–22 mm range.
Each piece is a complete coupling assembly (two hubs + one spider insert). Multi-pack options (2, 3, 4, or 5 pcs) are priced per set and are useful for equipping multi-axis CNC machines or keeping spares on hand. Select your required quantity from the QTY variant option before adding to cart.
