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When a misaligned shaft causes vibration, lost steps, or premature bearing wear in your CNC router, servo drive, or motion-control axis, the coupling is often the first component to blame — and the last one checked. This D34 single diaphragm flexible shaft coupling is engineered for engineers, machinists, and automation builders who need a reliable, zero-backlash connection between a servomotor and a lead screw, ball screw, or encoder shaft.
Each coupling features an aluminum alloy hub body paired with a stainless steel single diaphragm flexing element. The outer diameter is 34mm (approximately 1.34 in) and the overall length is 32mm (approximately 1.26 in). Bore sizes d1 and d2 are independently selectable across a range of 6–14mm (approximately 0.24–0.55 in), allowing same-bore or stepped-bore configurations to suit your exact shaft pairing.
Typical applications include CNC milling and routing machines requiring single diaphragm servo coupler D34 zero backlash, 3D printer Z-axis lead screw couplings with flexible diaphragm, and industrial servo motor shaft couplings for precision motion control systems. The diaphragm design accommodates angular and axial misalignment while transmitting torque without play, making it a dependable choice for closed-loop servo feedback applications.
| Coupling Type | Single Diaphragm Flexible Shaft Coupling |
|---|---|
| Outer Diameter (OD) | 34mm (approx. 1.34 in) |
| Overall Length | 32mm (approx. 1.26 in) |
| Bore d1 Range | 6–14mm (approx. 0.24–0.55 in) |
| Bore d2 Range | 6–14mm (approx. 0.24–0.55 in) |
| Hub Material | Aluminum Alloy |
| Diaphragm Material | Stainless Steel |
| Backlash | Zero (diaphragm type) |
| Misalignment Type | Angular & Axial |
| Bore Combination | Same-bore or stepped-bore (see variant options) |
| Quantity per Pack | See variant options (1 / 2 / 3 / 10 / 12 pcs) |
| Finish | See variant options |
| Max Recommended Speed | Contact us to confirm |
| Max Torque Rating | Contact us to confirm |
Measure the shaft diameter on your motor (d1) and the shaft diameter on your driven component — such as a lead screw or encoder (d2). Select the variant that matches both values. If your shafts are the same diameter, choose a same-bore option (e.g., d6–d6). If they differ, choose the stepped-bore option that matches both (e.g., d8–d10). All bore combinations from 6mm to 14mm are available.
A single diaphragm coupling uses one flexible stainless steel disc to transmit torque while accommodating misalignment. It handles angular and axial misalignment well and is the standard choice for most servo and CNC applications. A double diaphragm coupling adds a second disc and a spacer, allowing greater angular misalignment compensation — typically used when shaft offset is more pronounced. For most CNC and servo motor connections, a single diaphragm is sufficient and more compact.
Yes. The diaphragm design transmits torque through the elastic deformation of the stainless steel disc rather than through mechanical interlocking teeth or jaws. This means there is no rotational play between the input and output shafts, which is critical for closed-loop servo positioning systems where backlash would cause positioning error and hunting.
The diaphragm element is stainless steel, which offers good resistance to moisture and mild coolant exposure. The aluminum alloy hub body is also corrosion-resistant under normal workshop conditions. For environments with aggressive cutting fluids or salt spray, we recommend confirming suitability with us before ordering.
This coupling is compatible with any application that uses shafts in the 6–14mm diameter range, including CNC routers, CNC milling machines, 3D printer Z-axis assemblies, laser engravers, servo-driven linear actuators, rotary encoders, and general industrial automation equipment. Verify that the OD (34mm) and length (32mm) fit within your machine's coupling clearance envelope before ordering.
If you are building or repairing a single axis, the 1-piece option is the most economical entry point. For multi-axis machines (e.g., a 3-axis CNC router), ordering a 3-pack covers all axes in one order. The 10-piece and 12-piece packs offer a lower per-unit cost and are suited for production builds, spare parts inventory, or resale. Select the QTY variant that matches your project scale.
Yes. The single diaphragm design is specifically engineered to accommodate angular misalignment between the motor shaft and the driven shaft. This reduces the load transmitted to motor bearings caused by imperfect shaft alignment during installation. However, for best results and longest service life, align shafts as closely as possible and use the coupling's misalignment capacity as a tolerance buffer rather than a primary alignment correction method.
