Flexible Shaft Coupler for NEMA 23 Stepper, 6.35mm to 5mm Aluminum
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Prices updated: 14 Oct 2026
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About this product
A machined aluminum shaft coupler with a spiral cut that makes it slightly flexible. It joins a NEMA 23 stepper shaft of 6.35 mm to a 5 mm shaft, and the flex helps absorb small misalignment and reduce bending load. It suits stepper-driven lead screws and positioning systems in CNC and robotics builds.
Specifications
- Material
- Machined aluminum
- Inner diameter
- 6.35 mm to 5 mm
- Outer diameter
- 20 mm
- Length
- 25 mm
Frequently asked questions
Is it suitable for a NEMA 23 stepper motor?
Yes, it is designed for NEMA 23 stepper shafts with a standard 6.35 mm diameter. Its 5 mm bore on the other side fits a shaft of that size, such as a lead screw or encoder shaft.
Why choose a flexible coupler instead of a rigid one?
The spiral cut lets the coupler tolerate slight misalignment between shafts and reduces bending stress on the motor bearings. If the shafts are perfectly aligned, a rigid coupler also works.
