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When shaft misalignment, vibration, or torque shock threatens the accuracy of your CNC machine, servo drive, or stepper motor setup, a rigid coupling simply isn't enough. Engineers and DIY machinists who demand smooth, reliable power transmission need a flexible jaw coupling that absorbs angular, parallel, and axial misalignment without sacrificing rotational precision. This D40xL75mm aluminum spider jaw plum coupler is engineered for exactly that application.
This flexible shaft coupling features a CNC-machined aluminum alloy body with an outer diameter of 40mm (≈1.57 in) and an overall length of 75mm (≈2.95 in). The two-piece jaw design clamps around a polyurethane spider insert, which acts as the flexible element. Bore sizes range from d14mm to d22mm (≈0.55–0.87 in), with both same-bore and mixed-bore combinations available across the variant matrix. Set screws secure each hub to its respective shaft.
Typical use cases include CNC router and milling machine lead-screw connections, servo and stepper motor couplings for 3D printers and laser cutters, and general-purpose flexible shaft coupling for pumps, encoders, and light industrial drives where vibration damping and misalignment compensation are required.
| Coupling Type | Spider Jaw (Plum) Flexible Coupling |
|---|---|
| Body Material | Aluminum Alloy |
| Outer Diameter (OD) | 40mm (≈1.57 in) |
| Overall Length (L) | 75mm (≈2.95 in) |
| Bore Diameter Range | d14mm – d22mm (≈0.55–0.87 in) |
| Bore Configuration | Same-bore and mixed-bore variants available |
| Flexible Element | Polyurethane Spider Insert |
| Shaft Retention | Set Screw |
| Finish | See variant options |
| Quantity per Order | 1 / 2 / 3 / 5 / 8 pcs (select above) |
Measure the outer diameter of each shaft you need to connect. Select the variant where d1 matches your drive-side shaft and d2 matches your driven-side shaft. If both shafts are the same diameter, choose a same-bore variant (e.g., d14×d14). If they differ, choose the appropriate mixed-bore variant (e.g., d14×d22). All bore sizes are listed in the "OD x Length / φd1 – φd2" option above.
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 limited axial misalignment (shafts slightly apart or compressed). It is not designed for large misalignment values; always align shafts as closely as possible for maximum coupling life.
Yes. The D40×L75mm jaw coupling is widely used on CNC router lead screws, 3D printer Z-axis motor connections, laser cutter drive shafts, and similar light-to-medium duty motion control applications. Verify that the bore sizes match your motor shaft and lead screw shaft before ordering.
Aluminum alloy offers good natural corrosion resistance for indoor and dry workshop environments. For humid or mildly corrosive environments, the anodized or natural aluminum surface provides adequate protection. It is not recommended for continuous immersion or highly corrosive chemical exposure.
The two aluminum hubs are reusable. If the polyurethane spider insert wears out over time, you can replace it independently — search for a compatible 6-jaw or 8-jaw spider insert matching the D40 jaw profile. Contact us to confirm spider insert compatibility before purchasing a replacement.
Each quantity option (1, 2, 3, 5, or 8 pcs) ships the same coupling model in the selected bore combination. Multi-piece orders are priced at a lower per-unit rate and are ideal for multi-axis CNC machines, production setups, or keeping maintenance spares on hand. Select your preferred quantity in the QTY option above.
Each hub is secured using set screws. Slide the hub onto the shaft to the desired depth, then tighten the set screw(s) with the appropriate hex key. For best results, ensure the shaft surface is clean and free of oil before tightening. Apply thread-locking compound to the set screw if vibration is a concern.
