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When misalignment between two shafts causes vibration, noise, or premature wear on your CNC machine, pump, or motor drive system, the root cause is often a rigid coupling that cannot absorb angular or parallel offset. Engineers, makers, and automation technicians who need a compact, torque-transmitting solution rely on a jaw spider shaft coupling to bridge the gap without sacrificing rotational accuracy.
This 25mm jaw spider shaft coupling is machined from aluminum alloy and consists of two jaw hubs and a polyurethane spider insert. The outer diameter is 25mm (approximately 0.98 in), with body lengths of 30mm (~1.18 in) or 35mm (~1.38 in) depending on the variant selected. Bore combinations range from 4mm to 12mm (approximately 0.16 in to 0.47 in) on each side, covering same-bore and mixed-bore configurations.
Typical applications include stepper motor to lead-screw connections on 3D printers and CNC routers, pump shaft couplings in fluid-handling systems, and servo motor drives in light industrial automation. The spider insert dampens shock loads and reduces backlash, making this coupler well suited for encoder-driven positioning stages and ball-screw assemblies.
Machined aluminum alloy hubs deliver a strong, lightweight body that resists corrosion and handles continuous rotational loads without deforming under typical motor torque ranges.
The flexible spider element absorbs vibration and shock between the two hubs, reducing transmitted noise and protecting connected components from sudden load spikes.
Available in same-bore and mixed-bore combinations from 4mm to 12mm, covering the most common stepper motor shaft and lead-screw shaft diameters used in CNC and automation builds.
Choose D25×L30mm for compact installations or D25×L35mm where additional axial clearance is needed between motor face and driven component.
Each hub is secured to its shaft via set screws, allowing tool-free disassembly and reassembly during maintenance or shaft swaps without damaging the shaft surface.
Order as a single coupler for a one-off build or select the 5-piece pack for multi-axis machines, spare inventory, or workshop stock at a reduced per-unit cost.
| Coupling Type | Jaw Spider (Plum / Oldham style) |
|---|---|
| Outer Diameter | 25mm (~0.98 in) |
| Body Length | 30mm (~1.18 in) or 35mm (~1.38 in) — see variant options |
| Bore Range (d1 / d2) | 4mm to 12mm (~0.16 in to 0.47 in) — see variant options |
| Hub Material | Aluminum alloy |
| Spider Insert Material | Polyurethane (PU) |
| Shaft Fixation | Set screw |
| Quantity per Order | 1 Pcs or 5 Pcs — see variant options |
| Finish | Natural aluminum (uncoated) |
| Max Recommended Speed | See variant options |
Measure the shaft diameter of your motor (d1) and the shaft diameter of your driven component such as a lead screw or pump shaft (d2). Select the variant that matches both values. For example, if your stepper motor shaft is 5mm and your lead screw is 8mm, choose the 5mm * 8mm option. Mixed-bore combinations are available across the full 4–12mm range.
Yes. The polyurethane spider insert allows the coupling to accommodate small degrees of angular misalignment (typically up to 1°) and minor parallel offset between the two shaft centerlines. For best performance and longevity, align shafts as closely as possible during installation and use the spider insert to absorb residual misalignment rather than as a primary correction method.
Aluminum alloy hubs are well suited for the torque levels produced by NEMA 17 and NEMA 23 stepper motors, small servo motors, and light-duty pump drives. The material provides a favorable strength-to-weight ratio and resists fatigue under cyclic loading. For very high-torque or high-speed industrial applications, confirm the torque rating against your motor specifications before ordering.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical workshop and indoor automation environments. For applications involving direct water contact or chemical exposure, consider applying a protective coating or selecting a stainless steel coupling instead. The polyurethane spider insert is resistant to oils and mild solvents.
The D25×L30mm variant is the more compact option and fits installations where axial space between the motor face and the driven shaft is limited. The D25×L35mm variant provides 5mm of additional length, which can be useful when the motor shaft protrudes further or when you need more clearance for a shaft collar or locking nut. Both variants share the same 25mm outer diameter and bore range.
If you are building or repairing a single-axis machine, the 1-piece option is sufficient. The 5-piece pack is cost-effective for multi-axis CNC routers, 3D printers with multiple lead screws, or workshop stock where having spares on hand avoids downtime. The per-unit cost is lower in the 5-piece pack.
Slide each hub onto its respective shaft until the shaft end is flush with or slightly recessed from the outer face of the hub. Tighten the set screw(s) using the appropriate hex key until the hub is firmly clamped. Insert the spider element between the two hubs, then bring the hubs together so the spider fingers engage the jaw slots on both sides. Verify that the assembly rotates smoothly before powering the motor.
🛒 Select your Dia. x Length, bore size (φd1 * φd2), and quantity above, then add to cart.
