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When misalignment, vibration, or backlash creep into your motion system, positioning accuracy suffers and components wear prematurely. Engineers, CNC builders, and automation technicians who demand repeatable, sub-micron performance need a coupling that transmits torque faithfully while absorbing angular and axial deviation without play. These D44 double diaphragm flexible shaft couplings are engineered for exactly that application.
Each coupling features a precision-machined aluminum alloy body with a fixed outer diameter of 44mm (1.73 in) and an overall length of 50mm (1.97 in). The double diaphragm design uses two thin stainless steel diaphragm discs to achieve torsional rigidity while accommodating angular misalignment of typically 1–3° and axial displacement of typically ±0.5–1.0mm. Bore options span φd1 and φd2 from 8mm to 22mm (0.31–0.87 in), covering the most common servo and stepper motor shaft sizes.
Typical use cases include CNC router and milling machine Z-axis ballscrew connections, servo motor to encoder shaft coupling for closed-loop feedback systems, and precision linear actuator drive trains where zero-backlash double diaphragm couplings are required to maintain positioning repeatability across thousands of cycles.
| Coupling Type | Double Diaphragm Flexible |
|---|---|
| Outer Diameter (D) | 44mm (1.73 in) |
| Overall Length (L) | 50mm (1.97 in) |
| Bore φd1 Range | 8mm – 22mm (0.31–0.87 in) |
| Bore φd2 Range | 8mm – 22mm (0.31–0.87 in) |
| Body Material | Aluminum Alloy |
| Diaphragm Material | Stainless Steel |
| Angular Misalignment | Typically 1–3° |
| Axial Displacement | Typically ±0.5–1.0mm |
| Backlash | Zero (rigid torsional transmission) |
| Finish | See variant options |
| Pack Quantity | 1 Pcs / 5 Pcs (select above) |
Measure the outer diameter of your motor shaft (φd1) and your load shaft or ballscrew end (φd2) with a caliper. Select the matching combination from the φd1 * φd2 option menu. Both bores can be the same size (e.g., 10mm * 10mm) or different (e.g., 8mm * 12mm) for mixed-shaft setups.
Exact rated torque depends on the specific bore configuration and operating conditions. For a D44 double diaphragm coupling of this size, typical continuous torque capacity is in the range of 5–15 Nm. Contact us to confirm the rated torque for your specific bore selection and application.
Yes. The double diaphragm design transmits torque through thin stainless steel diaphragm discs that flex to accommodate misalignment without any rotational play. This makes it suitable for closed-loop servo systems and CNC axes where backlash would cause positioning error.
Yes. The double diaphragm configuration compensates for angular misalignment (typically 1–3°) and axial displacement (typically ±0.5–1.0mm) at the same time. Avoid exceeding these limits simultaneously, as combined misalignment reduces the effective capacity of each type.
Aluminum alloy couplings are the standard choice for CNC routers, milling machines, and servo-driven linear axes because they offer an excellent strength-to-weight ratio. Lower rotational inertia compared to steel couplings improves servo response. For very high-torque or shock-load environments, contact us to discuss suitability.
Both options contain identical couplings. The 1-piece pack is ideal for single-machine builds, repairs, or prototyping. The 5-piece pack offers a lower per-unit cost and is suited for production runs, multi-axis machines, or maintaining a spare-parts inventory.
Compatibility depends on your motor's shaft diameter, not the brand. As long as your motor shaft diameter falls within the 8–22mm bore range offered, the coupling will fit. Verify the shaft diameter in your motor's datasheet and select the matching φd1 bore size.
