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When misalignment between a motor shaft and a driven component causes vibration, noise, or premature wear, engineers and machine builders need a coupling that absorbs shock without sacrificing torque transmission. This jaw-type spider flexible coupling is designed for CNC machine builders, pump installers, and motor drive integrators who require a reliable, zero-backlash connection between two shafts of equal or different diameters.
The coupling consists of two aluminum alloy hubs and a polyurethane spider insert. The outer diameter is 55 mm (≈2.17 in) and the overall length is 110 mm (≈4.33 in). Bore sizes for both d1 and d2 are selectable from 14 mm up to 28 mm (≈0.55 in – 1.10 in), covering a wide range of shaft combinations. Each hub features a splined jaw (plum-blossom) profile that engages the spider elastomer for vibration damping.
Typical applications include CNC router and laser engraver spindle-to-motor connections, centrifugal pump shaft couplings, servo and stepper motor drive trains, and general industrial shaft-to-shaft power transmission where angular, parallel, or axial misalignment compensation is needed.
| Coupling Type | Jaw / Spider (Plum-Blossom) |
|---|---|
| Outer Diameter (OD) | 55 mm (≈2.17 in) |
| Overall Length (L) | 110 mm (≈4.33 in) |
| Bore d1 Range | 14 – 28 mm (≈0.55 – 1.10 in) |
| Bore d2 Range | 14 – 28 mm (≈0.55 – 1.10 in) |
| Hub Material | Aluminum Alloy |
| Spider / Insert Material | Polyurethane (PU) |
| Misalignment Compensation | Angular, Parallel, Axial |
| Backlash | Zero (jaw-to-spider contact) |
| Rated Torque | See variant options |
| Max. Speed | See variant options |
| Quantity per Order | 1 pcs or 3 pcs (select above) |
Measure the outer diameter of each shaft you need to connect. d1 is the bore for the input (motor) shaft and d2 is the bore for the output (pump or driven) shaft. Both can be the same diameter or different — for example, d1 = 19 mm and d2 = 24 mm. Select the matching combination from the "OD x Length / φd1 – φd2" dropdown above. If your exact combination is not listed as a preset, choose the "Min. ≤ d ≤ Max." free-choice option and specify your sizes in the order notes.
Rated torque depends on the spider durometer and the specific bore/hub wall thickness of the selected variant. For confirmed torque ratings for your application, please contact us with your bore sizes and operating RPM. As a general guide, D55 jaw couplings in this class typically handle 20–50 Nm depending on spider hardness.
Yes. The zero-backlash jaw design makes it well-suited for CNC spindle-to-motor and stepper/servo motor drive connections where positional accuracy matters. The polyurethane spider also dampens vibration that could otherwise affect cut quality or engraving precision.
The hubs are machined from aluminum alloy, which offers good natural oxidation resistance for indoor and light-industrial environments. For high-humidity or chemically aggressive environments, consider applying a protective coating or selecting a stainless-steel coupling variant if available.
Yes. One of the key advantages of the jaw coupling design is that the polyurethane spider can be slid out radially and replaced without disturbing the hub-to-shaft connections. This significantly reduces maintenance downtime in production environments.
This jaw spider coupling accommodates angular misalignment (shafts at a slight angle), parallel (radial) misalignment (shafts offset laterally), and axial misalignment (shafts displaced along their common axis). Typical allowable values are: angular ≤ 1°, parallel ≤ 0.2 mm, axial ≤ 1 mm — confirm exact limits for your application before installation.
The "3 pcs" quantity option means three complete coupling assemblies (each consisting of two hubs and one spider insert), not three individual components. This is useful for multi-axis machines or when stocking spares.
