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When shaft misalignment causes vibration, noise, or premature wear in your CNC router, 3D printer, or stepper motor drive system, the weak link is almost always the coupling. Engineers and DIY builders who demand smooth, low-backlash power transmission need a coupling that compensates for angular, parallel, and axial misalignment without sacrificing torque capacity. This D45mm L66mm jaw spider shaft coupler is engineered for exactly that role.
The coupler consists of two aluminum alloy hubs (outer diameter 45mm / 1.77 in, length 66mm / 2.60 in total) joined by a polyurethane spider insert. Bore options span 6mm to 25mm (0.24–0.98 in) on each side, with both same-bore and cross-bore combinations available across 210 variants. Each hub is secured to the shaft via a clamping screw arrangement. The spider insert sits between the two hubs, transmitting torque while absorbing shock and damping vibration.
Typical use cases include CNC stepper motor shaft coupling for lead screw drives, servo motor connections in automation rigs, and flexible coupling for 3D printer Z-axis assemblies. The jaw-type plum coupling design is also widely used in laser engraver axis drives and small milling machine spindle connections where low backlash flexible coupling is critical.
| Outer Diameter (D) | 45mm (1.77 in) |
|---|---|
| Total Length (L) | 66mm (2.60 in) |
| Bore Range (each side) | 6mm – 25mm (0.24–0.98 in) |
| Bore Configuration | Same-bore and cross-bore combinations available |
| Hub Material | Aluminum alloy |
| Spider Insert Material | Polyurethane (PU) |
| Coupling Type | Jaw / Plum / Spider flexible coupling |
| Shaft Retention | Set screw clamp |
| Misalignment Tolerance | See variant options |
| Max Torque | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 Pcs |
Measure both shafts you need to connect — the motor shaft and the lead screw or driven shaft — using a digital caliper. Select the variant that matches both diameters exactly (e.g., 8mm × 10mm means one side fits an 8mm shaft and the other fits a 10mm shaft). If both shafts are the same size, choose a same-bore variant such as 8mm × 8mm.
Yes. NEMA 17 motors typically have a 5mm shaft, but many upgraded versions use 6mm or 8mm shafts. NEMA 23 motors commonly use 6.35mm (1/4 in) or 8mm shafts. Select the bore variant that matches your specific motor shaft diameter. The D45mm outer diameter provides sufficient clearance for standard motor face mounts.
The aluminum alloy hubs provide rigid torque transmission, while the polyurethane spider insert handles shock absorption. For exact torque ratings, refer to the variant specifications or contact us to confirm suitability for your specific load. This coupling is well-suited for CNC routers, 3D printers, laser engravers, and light milling applications.
The aluminum alloy hubs offer good natural corrosion resistance suitable for indoor workshop and light industrial environments. The polyurethane spider insert resists oils and mild solvents. For harsh chemical or outdoor environments, contact us to confirm compatibility before ordering.
The jaw spider design compensates for angular misalignment (shafts at a slight angle to each other), parallel misalignment (shafts offset laterally), and axial misalignment (slight end-play between shafts). The polyurethane insert flexes to absorb these deviations without transmitting stress to motor bearings or lead screw nuts. Exact tolerance values depend on the specific bore size — contact us for details.
No special tools are required. Slide each hub onto its respective shaft, align the coupler, then tighten the set screws using a standard hex key (Allen wrench). Ensure the spider insert is seated evenly between both hubs before final tightening. No keyway machining is needed for smooth motor shafts.
The polyurethane spider insert is the wear component in a jaw coupling. In many cases the insert can be replaced independently without replacing the aluminum hubs. Contact us with your coupler dimensions to confirm insert availability for your specific D45mm L66mm variant.
