Aluminum Flex Shaft Coupler – 0.250″ to 5mm


Availability: In Stock

This 0.250″ to 5mm shaft coupler has a helical cut that allows for a secure and stable connection even if the shafts are not perfectly aligned. The helical cut also reduces binding and allows for some flexibility in the X, Y, and Z axis, but not in the rotational axis.


SKU: ROB-149 Category: Tags: ,


A shaft coupler is a mechanical device used to connect two shafts with different diameters. This coupler is designed to fit shafts with a diameter of 4mm on one end and 8mm on the other, allowing for a secure and stable connection. The coupler has a helical cut that allows two shafts that are not perfectly aligned to be joined together while reducing binding. The helical cut means these are a little springy in the X, Y, and Z axis but not in the rotational axis meaning they will not cause additional backlash.

This specific version is designed to couple a 1/4” shaft to a 5mm shaft and is perfect for connecting our large 125 oz-in Stepper Motor to a 5mm shaft or any of our NEMA17 steppers to a 0.250″ shaft.


  • 1/4˝ to 5mm coupling
  • Diameter: 19mm
  • Aluminum construction
  • Length: 25mm

Package Contents

  • 1 x Aluminum Flex Shaft Coupler - 0.250˝ to 5mm

  Difficulty Level

Soldering Skill: N/A
Prototyping Skill: N/A
Programming Skill: N/A

  Product Certifications

  Product Attributes

Weight: 16 g

  Warranty Policy

This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.

  Return Policy

This product is returnable Within 14 Days of delivery for a store credit. Item must be unopened, unused, and in re-saleable condition.

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