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When misalignment, vibration, or backlash creep into your CNC axis, positioning accuracy suffers and motor loads spike. Engineers, machine builders, and DIY automation enthusiasts who demand repeatable motion need a coupling that holds tight under dynamic loads — not one that flexes where it shouldn't. The D32 double diaphragm flexible shaft coupling is engineered for exactly these high-precision servo and stepper motor applications.
This coupling features a double diaphragm design with an outer diameter of 32mm (1.26 in) and an overall length of 41mm (1.61 in). The body is machined from aluminum alloy with a natural anodized finish, offering a lightweight yet rigid structure. Bore combinations range from 6mm to 14mm (0.24–0.55 in) on both shaft ends, accommodating same-diameter or mixed-diameter shaft pairings. Clamping is achieved via split-clamp collar with set screws for secure shaft retention.
Typical use cases include CNC router Z-axis and ballscrew connections, servo motor to leadscrew coupling on 3D printer gantries, and precision rotary encoder shaft linking in industrial automation rigs — all scenarios where zero-backlash double diaphragm couplings outperform jaw or beam-style alternatives.
| Coupling Type | Double Diaphragm Flexible |
|---|---|
| Outer Diameter (D) | 32mm (1.26 in) |
| Overall Length (L) | 41mm (1.61 in) |
| Bore Diameter (φd1 / φd2) | 6mm – 14mm (see variant options) |
| Bore Combination | Same or mixed diameter (see variant options) |
| Body Material | Aluminum Alloy |
| Diaphragm Material | Stainless Steel |
| Surface Finish | Anodized |
| Shaft Retention | Split-Clamp with Set Screws |
| Backlash | Zero |
| Max Misalignment (Angular) | See variant options |
| Max Misalignment (Parallel) | See variant options |
| Rated Torque | See variant options |
| Pack Quantity | 1 / 3 / 5 / 8 / 10 pcs (see variant options) |
Measure the output shaft diameter of your motor (φd1) and the input shaft of your ballscrew or leadscrew (φd2). Select the variant that matches both diameters — for example, if your servo motor has an 8mm shaft and your ballscrew has a 10mm shaft, choose the 8mm × 10mm option. Mixed-diameter variants are available for exactly this scenario.
Rated torque varies by bore size and diaphragm configuration. For specific torque ratings applicable to your bore combination, please contact us to confirm. As a general guide, D32 aluminum double diaphragm couplings in this class typically handle 5–15 Nm depending on bore and diaphragm thickness.
Yes. The double diaphragm design transmits torque through thin stainless steel diaphragm discs that flex to accommodate misalignment without any mechanical play. Unlike jaw couplings (which rely on an elastomer spider) or beam couplings (which can exhibit micro-slip), diaphragm couplings deliver true zero-backlash performance — essential for closed-loop servo systems and CNC positioning axes.
The double diaphragm design accommodates angular misalignment (typically up to 1°–2°) and small amounts of axial displacement. It is not designed for large parallel (radial) offset — if significant parallel misalignment exists between your shafts, realign the motor mount before installation. Consult the product datasheet or contact us for exact misalignment tolerances for your bore size.
The aluminum body is anodized for corrosion resistance, making it suitable for dry workshop environments, light industrial settings, and indoor CNC machines. The stainless steel diaphragms are inherently corrosion-resistant. Avoid prolonged exposure to strong acids, alkalis, or salt spray without additional protection.
Yes. NEMA 17 motors typically have 5mm shafts, but many upgraded versions use 6mm or 8mm shafts — select the bore variant that matches your specific motor shaft. NEMA 23 motors commonly use 6.35mm (1/4 in) or 8mm shafts. Choose the bore combination that covers your motor shaft on one side and your leadscrew or encoder shaft on the other.
A standard 3-axis CNC router or mill requires one coupling per axis — so a minimum of 3 units. Ordering a Pack of 3 or Pack of 5 gives you spares for future maintenance or additional axes. Multi-axis builds benefit from the lower per-unit cost of larger pack sizes.
