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When misalignment between a servo motor and a lead screw causes vibration, lost steps, or premature bearing wear, the coupling is often the first component to blame. Engineers and machine builders working on CNC routers, laser engravers, 3D printers, and precision automation systems need a coupling that absorbs angular and axial misalignment without sacrificing torque transmission accuracy — and that is exactly what this single diaphragm design delivers.
This flexible shaft coupling features an aluminum alloy body with a stainless steel single diaphragm flexing element. The outer diameter is D32mm (approximately 1.26 inches) and the body length is L29mm (approximately 1.14 inches). Bore sizes (φd1 × φd2) range from 6mm to 14mm on each side, covering the most common servo and stepper motor shaft diameters. Clamping is achieved via split-clamp collar design with set screws for secure shaft retention.
Typical use cases include connecting NEMA 23/34 servo motors to ball screws on CNC milling machines, coupling stepper motors to lead screws on gantry-style routers, and linking encoder shafts to drive shafts in precision motion control systems where zero-backlash flexible shaft coupling performance is required.
| Coupling Type | Single Diaphragm Flexible Shaft Coupling |
|---|---|
| Outer Diameter (D) | 32mm (≈1.26 in) |
| Body Length (L) | 29mm (≈1.14 in) |
| Bore Diameter φd1 | 6mm – 14mm (see variant options) |
| Bore Diameter φd2 | 6mm – 14mm (see variant options) |
| Body Material | Aluminum Alloy |
| Diaphragm Material | Stainless Steel |
| Clamping Method | Split-clamp collar with set screws |
| Backlash | Zero backlash (diaphragm design) |
| Misalignment Compensation | Angular, axial, and parallel |
| Quantity per Pack | 1 / 3 / 5 / 10 / 15 Pcs (see variant options) |
| Weight (per piece) | See variant options |
Measure the shaft diameter of your motor (φd1) and the shaft diameter of your lead screw or driven component (φd2) using a digital caliper. Select the variant that matches both measurements. The two bore ends can be different sizes — for example, a 6.35mm (1/4 inch) motor shaft paired with an 8mm lead screw would use the 6mm × 8mm variant (6mm is the closest standard bore to 6.35mm; confirm fit before ordering).
A single diaphragm coupling uses one flexing disc to accommodate misalignment and is generally more compact and lower in inertia, making it suitable for most CNC servo and stepper motor applications. A double diaphragm coupling uses two discs and can handle greater angular misalignment but is longer. For standard CNC axis applications with well-aligned shafts, the single diaphragm design is the more common and cost-effective choice.
Yes. The diaphragm flexing element transmits torque through elastic deformation of the stainless steel disc rather than through mechanical contact between mating teeth or jaws. This eliminates the clearance gaps that cause backlash in jaw or oldham couplings, making diaphragm couplings the preferred choice for closed-loop servo systems where positional accuracy is critical.
Single diaphragm couplings of this size typically accommodate angular misalignment of approximately 1°–3° and axial displacement of typically 0.1–0.5mm. Exact values depend on operating speed and torque load. For best coupling life, align shafts as precisely as possible during installation and use the coupling's flexibility only to absorb residual misalignment, not as a substitute for proper alignment.
NEMA 23 motors commonly have 6.35mm (1/4 in) or 8mm output shafts. NEMA 34 motors typically have 12mm or 14mm output shafts. Select the bore variant that matches your specific motor's shaft diameter. The D32mm outer diameter is compatible with standard NEMA 23 and NEMA 34 motor face clearances in most CNC machine designs.
Yes. This coupling is well-suited for 3D printers using lead screw Z-axis drives and for laser engravers with servo or stepper-driven axes. The compact D32 × L29mm form factor fits within the tight clearances typical of desktop CNC and laser systems. Confirm your motor and lead screw shaft diameters match the available bore options before ordering.
Slide each bore end onto the respective shaft until the shaft is flush with or slightly recessed from the inner face of the coupling body. Tighten the split-clamp set screws evenly using the appropriate hex key (typically M3 or M4 depending on bore size). Apply thread-locking compound to the set screws if the application involves frequent direction reversals or vibration. Do not overtighten, as this can deform the bore or damage the diaphragm.
