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When misalignment, vibration, or angular offset threatens the accuracy of your CNC machine or servo drive system, a rigid coupling simply won't cut it. Engineers and machine builders who demand zero-backlash torque transmission without sacrificing flexibility turn to double diaphragm couplings. This aluminium D82 double diaphragm flexible shaft coupling is engineered for servo motors, stepper motors, ball screw assemblies, and precision CNC spindle applications where reliable power transfer is non-negotiable.
Machined from aluminium alloy, this coupling features a double diaphragm design that accommodates parallel, angular, and axial misalignment simultaneously. The outer diameter is 82mm (approx. 3.23 in) with a body length of 98mm (approx. 3.86 in). Bore sizes range from d14mm to d45mm (approx. 0.55 in to 1.77 in) across both shaft ends, with a wide selection of same-bore and mixed-bore combinations available as variants.
Typical use cases include flexible shaft coupling for servo motor to ball screw connections, double diaphragm CNC coupler for rotary table drives, and aluminium shaft coupling for laser engraver and router spindle assemblies. The clamp-style hub design ensures secure shaft retention without set-screw damage to precision shafts.
Dual diaphragm flexing elements accommodate parallel, angular, and axial misalignment simultaneously, protecting bearings and encoders from side-load stress.
Lightweight aluminium body reduces rotational inertia for faster servo response, while maintaining structural rigidity under dynamic torque loads.
Diaphragm flexing eliminates the play found in jaw or oldham couplings, making this coupling suitable for closed-loop servo and encoder feedback systems.
Available in same-bore and mixed-bore configurations across both shaft ends, covering the most common servo motor and ball screw shaft diameters in one product family.
Split-clamp hubs grip the shaft evenly around the circumference, preventing shaft damage and allowing tool-free repositioning during machine setup.
Designed for direct use in CNC routers, laser engravers, 3D printer Z-axis drives, and industrial servo motor applications requiring consistent angular velocity.
| Coupling Type | Double Diaphragm Flexible |
|---|---|
| Material | Aluminium Alloy |
| Outer Diameter (OD) | 82mm (approx. 3.23 in) |
| Body Length (L) | 98mm (approx. 3.86 in) |
| Bore Size Range (d1 / d2) | d14mm – d45mm (approx. 0.55 – 1.77 in) |
| Bore Configuration | Same-bore and mixed-bore variants available |
| Hub Style | Split Clamp |
| Backlash | Zero backlash (diaphragm type) |
| Misalignment Compensation | Parallel, Angular, Axial |
| Quantity per Order | 1 pcs |
| Weight | See variant options |
| Surface Finish | See variant options |
| Max. Torque | See variant options |
Measure the shaft diameter of both your motor and the driven component (e.g., ball screw) using a digital caliper. Select the variant where d1 matches your motor shaft and d2 matches your driven shaft. If both shafts are the same diameter, choose a same-bore variant (e.g., d20 – d20). Mixed-bore variants (e.g., d14 – d45) are available for applications where the two shaft diameters differ.
The double diaphragm design compensates for three types of misalignment simultaneously: parallel (lateral offset between shaft centerlines), angular (angle between shaft axes), and axial (end-play or thermal expansion along the shaft axis). This makes it suitable for servo and CNC applications where perfect shaft alignment is difficult to achieve mechanically.
Yes. Unlike jaw couplings or oldham couplings that rely on an elastomeric or sliding insert, the double diaphragm design transmits torque through thin metal diaphragm elements that flex without any play. This makes it appropriate for closed-loop servo systems and encoder feedback applications where backlash would cause positioning errors.
Aluminium alloy provides a good balance of strength and low rotational inertia for servo and CNC applications. It is well-suited for continuous duty in indoor machine environments. For applications involving exposure to cutting fluids, coolants, or corrosive atmospheres, consider verifying the surface treatment of the specific variant or contact us to confirm suitability.
A single diaphragm coupling uses one flexing disc and can compensate for angular and axial misalignment but generates a bending moment under parallel offset. A double diaphragm coupling uses two diaphragm elements connected by a spacer, which cancels out the bending moment and allows compensation of all three misalignment types without imposing radial loads on connected bearings. This makes the double diaphragm design preferable for precision servo and CNC applications.
Yes. This D82 double diaphragm coupling is commonly used on CNC routers, laser engravers, and 3D printer Z-axis lead screw or ball screw drives. Select the bore variant that matches your stepper or servo motor shaft diameter and your lead screw shaft diameter. The clamp-style hub allows easy installation and adjustment without damaging the shaft surface.
Clamp-style (split-clamp) hubs distribute clamping force evenly around the shaft circumference, which avoids the stress concentration and shaft surface damage caused by set screws. They also allow the coupling to be repositioned axially without leaving marks on the shaft, which is important for precision shafts used in servo and ball screw assemblies.
