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When misalignment, vibration, or torque shock causes premature wear on your drive train, the weak link is almost always a rigid coupling that cannot flex. Engineers and machine builders who need a reliable, zero-backlash connection between a motor shaft and a lead screw or ball screw turn to jaw plum couplings — and this D45xL55mm aluminum spider coupler is built exactly for that job. Whether you are retrofitting a CNC router, commissioning a servo axis, or replacing a worn coupling on an existing machine, this unit delivers the damping and flexibility your application demands.
This jaw plum shaft coupling features an aluminum alloy hub body with an outer diameter of 45 mm (approx. 1.77 in) and an overall length of 55 mm (approx. 2.17 in). The two-piece hub design clamps a polyurethane spider insert between them, absorbing angular misalignment typically up to 1°–3° and parallel offset typically up to 0.2–0.5 mm. Bore sizes range from d8 mm to d25 mm (approx. 0.31 in to 0.98 in), selectable per variant, with a clamping-style bore retention for secure shaft grip.
Typical use cases include CNC jaw plum coupling for stepper motor to lead screw connections, servo motor flexible coupler for ball screw drives, and aluminum spider coupling for 3D printer Z-axis or laser engraver feed systems — all scenarios where vibration damping and easy disassembly matter.
| Outer Diameter (OD) | 45 mm (1.77 in) |
|---|---|
| Overall Length | 55 mm (2.17 in) |
| Bore Range (d1 / d2) | 8 mm – 25 mm (0.31 in – 0.98 in) |
| Hub Material | Aluminum alloy |
| Spider / Insert Material | Polyurethane (PU) |
| Bore Retention Type | Clamping (split-clamp) |
| Angular Misalignment Tolerance | Typically 1°–3° (see variant options) |
| Parallel Offset Tolerance | Typically 0.2–0.5 mm (see variant options) |
| Finish | Natural anodized / machined |
| Quantity per Order | See variant options |
Measure the shaft diameter on your motor (d1) and the shaft diameter on your driven component such as a lead screw or ball screw (d2) using a digital caliper. Select the variant that matches both values. If both shafts are the same diameter, choose a same-bore variant (e.g., d10–d10). If they differ, choose the mixed-bore variant that matches your two shaft sizes.
Yes. The polyurethane spider insert allows the coupling to accommodate angular misalignment typically in the range of 1°–3° and parallel offset typically up to 0.2–0.5 mm. For best service life, align shafts as closely as possible during installation and use the coupling's flexibility only to absorb residual misalignment, not to compensate for poor machine assembly.
Yes. The D45xL55mm jaw plum coupling is widely used on CNC routers, laser engravers, 3D printer Z-axes, and similar motion systems where a stepper or servo motor drives a lead screw or ball screw. The low-backlash spider design supports accurate positioning, and the aluminum hub keeps rotating mass low.
Polyurethane spider inserts do wear over time, especially under high shock loads or elevated temperatures. The two-piece hub design allows you to separate the hubs and replace only the spider element without removing the hubs from the shafts, reducing downtime. Replacement spider inserts for this coupling size are available separately.
The maximum bore available in this coupling family is 25 mm (approx. 0.98 in). The minimum bore is 8 mm (approx. 0.31 in). Both d1 and d2 bores must fall within this range. If your shafts exceed 25 mm, you will need a larger coupling series.
This coupling uses a split-clamp (clamping-style) bore retention. A clamping screw tightens the split hub around the shaft, distributing clamping force evenly and avoiding the stress concentration and shaft marking associated with set screws. Tighten the clamp screw to the torque specified for the screw size used on your variant.
The bore sizes listed are metric (mm). If you have an imperial shaft, convert its diameter to millimeters and select the closest available bore. For example, a 3/8 in shaft is approximately 9.5 mm — in that case, a 10 mm bore with a thin shim or a precision-bored variant may be required. Contact us to confirm fit for non-standard shaft diameters.
