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When misalignment between a motor shaft and a driven shaft goes uncorrected, bearings wear prematurely, seals fail, and downtime follows. Engineers, machinists, and DIY builders who need a reliable, zero-backlash-tolerant connection between two rotating shafts rely on flexible jaw couplings to absorb angular, parallel, and axial misalignment before it becomes a costly problem.
This D55xL66 spider jaw coupling consists of two precision-machined hubs and a polyurethane spider insert. The outer diameter is 55 mm (approx. 2.17 in) and the overall length is 66 mm (approx. 2.60 in). Bore sizes for both hub ends (d1 and d2) are selectable from 12 mm up to 30 mm (approx. 0.47–1.18 in), with same-bore and mixed-bore combinations available across 190+ variants.
Typical applications include CNC router spindle-to-motor connections, centrifugal pump drives, servo and stepper motor couplings, and general power-transmission setups where a rigid coupling would transmit shock loads directly to sensitive components.
Both hub ends accept shaft diameters from 12 mm to 30 mm, with same-bore and mixed-bore options — over 190 combinations available to match your exact shaft pairing.
The polyurethane spider insert cushions torsional shock and damps vibration between driver and driven shafts, extending the service life of connected bearings and seals.
At 55 mm OD and 66 mm length, this coupling fits tight machine envelopes where larger rigid couplings cannot be accommodated without redesign.
Accommodates angular, parallel (radial), and axial misalignment — reducing stress on motor bearings and pump seals caused by imperfect shaft alignment during installation.
Each hub is secured to its shaft via set screws, allowing installation and removal without disturbing adjacent components. The spider insert can be replaced independently without removing the hubs.
Designed for CNC spindle drives, centrifugal and gear pumps, servo and stepper motor outputs, and general industrial power-transmission shafting where flexible coupling is required.
| Coupling Type | Flexible Jaw / Spider (Plum) Coupling |
|---|---|
| Outer Diameter (OD) | 55 mm (2.17 in) |
| Overall Length (L) | 66 mm (2.60 in) |
| Bore Diameter d1 | 12–30 mm (0.47–1.18 in) — See variant options |
| Bore Diameter d2 | 12–30 mm (0.47–1.18 in) — See variant options |
| Spider Insert Material | Polyurethane (PU) |
| Hub Material | Aluminum alloy (typically 6061-T6 grade) |
| Shaft Fixing Method | Set screw (grub screw) |
| Misalignment Tolerance | Angular: typically ≤1°; Radial: typically ≤0.2 mm; Axial: See variant options |
| Weight | See variant options |
| Quantity per Order | 1 pc (complete coupling with spider insert) |
Measure the outer diameter of each shaft you need to connect using a vernier caliper or micrometer. Select d1 to match your motor/driver shaft and d2 to match your driven shaft (pump, leadscrew, etc.). Both bores can be the same size or different — over 190 combinations are available. If your shaft has a keyway, contact us to confirm compatibility before ordering.
This flexible jaw coupling accommodates angular misalignment (typically up to 1°), parallel (radial) misalignment (typically up to 0.2 mm), and limited axial float. It is not designed for large angular or offset misalignments — for best results, align shafts as accurately as possible and use the coupling's flexibility as a buffer rather than a primary alignment correction.
Yes. Flexible jaw couplings are widely used on CNC router Z-axis leadscrews, stepper motor outputs, and servo drives. The spider insert absorbs micro-vibrations that would otherwise cause resonance artifacts in finished parts. Confirm your motor shaft and leadscrew shaft diameters match the bore options available before selecting a variant.
The torque capacity of a D55 jaw coupling depends on the spider insert durometer and hub material. For this size class, rated torque is typically in the range of 20–50 Nm depending on spider hardness. Contact us to confirm the rated torque for your specific application if you are operating near the upper end of this range.
Yes. The polyurethane spider insert sits between the two hubs and can be slid out and replaced without loosening the set screws or removing either hub from its shaft. This makes maintenance straightforward — simply separate the hubs axially by the insert thickness, swap the spider, and re-close.
The aluminum alloy hubs form a natural oxide layer that provides moderate corrosion resistance in typical workshop and light industrial environments. For continuous exposure to water, salt spray, or aggressive chemicals, consider applying a protective coating or contact us about alternative hub materials. The polyurethane spider insert is inherently resistant to oils and mild chemicals.
Absolutely — this is one of the key advantages of this product. Mixed-bore variants (e.g., d1=14 mm motor shaft paired with d2=20 mm pump shaft) are available. Simply select the variant that matches your motor shaft for d1 and your pump shaft for d2. If you do not see your exact combination listed, contact us and we can advise on the closest available option.
