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When misalignment between motor and lead screw causes vibration, lost steps, or premature bearing wear, the coupling is often the first thing to check. Engineers and CNC builders who need reliable torque transmission without sacrificing angular or parallel compensation turn to double diaphragm flexible shaft couplings. These couplings are designed for servo motors, stepper motors, and precision CNC spindle assemblies where zero backlash and torsional rigidity are non-negotiable.
Each coupling is machined from aluminium alloy and features a dual-diaphragm disc design that accommodates angular misalignment, parallel offset, and axial displacement simultaneously. Two outer diameter options are available: D19 × L26mm (approximately 0.75" × 1.02") and D26 × L35mm (approximately 1.02" × 1.38"). Bore sizes (d1 and d2) range from 4mm to 10mm (approximately 0.16"–0.39"), with same-bore and mixed-bore combinations selectable per variant.
Typical applications include 3-axis and 5-axis CNC router builds requiring double diaphragm servo coupler aluminium, ball screw to motor connections on milling machines, and encoder shaft coupling for closed-loop stepper systems. The lightweight aluminium construction also suits robotics joints and laboratory automation rigs where inertia reduction matters.
| Coupling Type | Double Diaphragm Flexible |
|---|---|
| Hub Material | Aluminium Alloy |
| Diaphragm Material | Stainless Steel |
| Outer Diameter (OD) | D19mm / D26mm (see variant options) |
| Overall Length (L) | L26mm / L35mm (see variant options) |
| Bore Diameter d1 (Motor Side) | 4–10mm (see variant options) |
| Bore Diameter d2 (Load Side) | 4–10mm (see variant options) |
| Backlash | Zero |
| Misalignment Compensation | Angular, Parallel, Axial |
| Finish | Natural Aluminium / Anodized (see variant options) |
| Quantity per Order | 1 / 2 / 3 / 5 / 10 pcs (see variant options) |
Start with your motor shaft diameter (d1) and lead screw or encoder shaft diameter (d2). Select the variant that matches both values — or choose a mixed-bore variant if they differ. For compact NEMA 17 setups, the D19 × L26mm option is typically sufficient. For NEMA 23 or higher-torque NEMA 34 motors, the D26 × L35mm variant provides greater torsional capacity. Bore sizes range from 4mm to 10mm on both sides.
Torque capacity varies by OD and diaphragm configuration. The D19 × L26mm coupling is suited for light-to-medium servo and stepper motor applications, while the D26 × L35mm handles higher torque loads. For exact rated torque values for your specific application, contact us to confirm before ordering.
Yes. The double diaphragm design transmits torque through flexible stainless steel disc elements that are pre-loaded during assembly. This eliminates any rotational play (backlash) between the motor and load shafts, which is critical for closed-loop CNC positioning and encoder feedback accuracy.
The aluminium alloy hub has inherent oxidation resistance, and the stainless steel diaphragm elements are corrosion-resistant under typical workshop conditions including coolant mist and moderate humidity. For aggressive chemical environments, contact us to confirm suitability before ordering.
Yes. The variant selector includes mixed-bore options (e.g., d1 = 4mm, d2 = 6mm) specifically for this scenario. Select the variant where d1 matches your motor shaft and d2 matches your lead screw or driven shaft. All bore combinations within the 4–10mm range are available.
Double diaphragm couplings typically accommodate angular misalignment of up to 1–2°, parallel offset of typically 0.1–0.3mm, and axial displacement of typically 0.5–1.5mm depending on the OD and diaphragm stiffness. For precise tolerance requirements in your application, contact us to confirm before ordering.
Each listing offers 1, 2, 3, 5, or 10 pieces per order. Multi-piece variants are priced at a lower per-unit rate compared to single-piece orders, making them cost-effective for machine builders stocking spares or assembling multiple axes.
