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When misalignment between two motor shafts causes vibration, noise, or premature wear, the right shaft coupler makes all the difference. Engineers, CNC builders, and robotics hobbyists working with stepper motors, servo drives, and lead screws need a coupler that holds zero-backlash alignment while absorbing minor angular and parallel offsets without sacrificing torque transmission.
These rigid shaft flexible couplings are machined from aluminum alloy with a black anodized finish, featuring a split-clamp design secured by stainless steel set screws. Available in coupler dimensions ranging from D20mm×L25mm up to D65mm×L100mm, with bore diameters from 4mm to 35mm (approximately 0.16" to 1.38"). Each coupler ships as a single unit ready for installation.
Typical use cases include CNC router Z-axis lead screw connections, 3D printer stepper motor to rod couplings, and light-duty robotic joint shaft connections where a rigid yet slightly flexible connection is required to compensate for minor shaft runout.
| Product Type | Rigid Shaft Flexible Coupling (Jaw / Spider Type) |
|---|---|
| Material | Aluminum Alloy |
| Surface Finish | Black Anodized |
| Fastening Method | Split-Clamp with Stainless Steel Set Screws |
| Bore Diameter Range | 4mm – 35mm (approx. 0.16" – 1.38") |
| Coupler Outer Diameter Range | D20mm – D65mm |
| Coupler Length Range | L25mm – L100mm |
| Available Coupler Dimensions | D20×L25, D20×L30, D25×L35, D25×L40, D32×L40, D32×L45, D40×L50, D40×L65, D60×L60, D65×L70, D65×L100 |
| Shaft Diameter Compatibility | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 piece |
Match the coupler's bore diameters to your two shaft diameters — one bore per shaft end. Then select a coupler body size (outer diameter × length) that physically fits within your assembly clearance. Larger body sizes generally handle higher torque loads. If both shafts are the same diameter, choose a same-bore variant; for different diameters, select a stepped-bore option.
Yes. Many variants in this listing are stepped-bore couplers — for example, 6mm to 10mm or 12mm to 19mm. Each end of the coupler accepts a different shaft diameter, making them ideal for connecting a motor shaft to a lead screw or encoder shaft of a different size.
The split-clamp design with stainless steel set screws provides a firm mechanical grip. For best results, ensure shaft surfaces are clean and free of oil before installation, and tighten set screws to the recommended torque. For high-torque applications, verify the coupler's rated torque matches your motor's output — contact us to confirm if needed.
The black anodized aluminum finish provides good corrosion resistance for indoor workshop and light industrial environments. For prolonged outdoor or high-humidity exposure, periodic inspection is recommended. The stainless steel set screws also resist rust under normal conditions.
Compatibility depends on the shaft diameter of your specific motor, not the NEMA frame size. NEMA 17 motors typically have 5mm shafts, NEMA 23 motors commonly use 6.35mm or 8mm shafts, and NEMA 34 motors often have 12mm or 14mm shafts. Select the variant whose bore matches your motor shaft and driven shaft diameters.
Both share the same 20mm outer diameter but differ in length — 25mm vs. 30mm. The longer L30mm version provides slightly more shaft engagement depth per side, which can improve grip on shorter shaft stubs. Choose based on the available shaft insertion length in your assembly.
Yes. These couplers are widely used in 3D printer Z-axis assemblies to connect the stepper motor shaft to the lead screw. The flexible jaw element helps compensate for minor misalignment between the motor and lead screw, reducing binding and improving print quality. Select the bore sizes matching your motor shaft and lead screw diameter.
