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Aluminum Flex Shaft Coupler - 5mm to 8mm

SKU: ZO-830
Availability: 5
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Aluminum Flex Shaft Coupler - 5mm to 8mm


Connect this to that with a set-screw coupler. These couplers are made of machined aluminum and have a spiral cut that makes them slightly flexible so they can be fit to two shafts even if they are not perfectly co-linear and will help reduce binding effects. The way they're cut, they're a little springy in the X Y & Z linear axis but not in the rotational axis. That means that you won't get increased backlash - so they're suitable for precision CNC work.

This coupler will connect a 5mm diameter shaft to an 8mm diameter shaft. A perfect add on for our stepper motors. Comes with two sets of double set-screws (two per side) for secure attachment. You'll need a 2mm allen wrench to tighten/loosen the set-screws.

Technical Details

  • Measures 1" x 0.7" diameter / 25mm x 18mm diameter
  • 5mm inner diameter / 8mm inner diameter
  • 15 grams
4 ( 4 / 5 )
I used this product to couple my brushless motor to a boat propeller (motor = 8mm / shaft 5mm) for my RC boat project. Bad idea. This coupler is probably good for its intended application, which is probably CNC axis motors. I didn't have equipment to test the one that failed but I think my motor was running at least @ 10000 when it failed.

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