This high quality aluminum flexible coupling can be used to connect your NEMA23 stepper motor to your lead screw.  The flexibility will help with any misalignment. Material:  Aluminum Shaft: 6.35mm x 8mm Length: 25mm OD: Outer Diameter: 19mm 6.35mm fits a NEMA23 stepper while the 8mm fits our ACME Lead Screws.   Main dimensions: d1=6.35mm, d2=8mm, D=19mm, L=25mm

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