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If you're connecting shafts of two different sizes or even two of the same, you'll need a coupler to join them. be sure to pay attention to the Imperial vs. Metric sizes.

This is a small selection of our maker favorites, if you're after more options, check out our full range of Couplers and Collars.

  1. Servo Shaft Coupler - Hitec Standard ROB-12501 Sparkfun Australia - Express Delivery Australia Wide

    Servo Shaft Coupler - Hitec Standard

    SKU: ROB-12501
    These couplers allow you to connect a 1/4” shaft directly to your C1 Hitec servo spline. The set screw included with each shaft coupler works well with straight or d-shafts. These servo shaft couplers have a length of 0.5”, an outer diameter of 0.42”, and an inner diameter of 0.25”. Learn More
    $8.62 AUD, inc GST
    AUD, inc GST
    delivered by
    Fri 24th of Nov

    $8.62 AUD

  2. Shaft Coupler - 1/4" to 3mm" ROB-12412 Sparkfun Australia - Express Delivery Australia Wide

    Shaft Coupler - 1/4" to 3mm"

    SKU: ROB-12412
    These stainless steel shaft couplers allow you to couple two size shafts together. They can be used for connecting motor shafts to drive shafts, or two different-sized shafts. These shaft couplers have a length of 0.75”, a outer diameter of 0.42”, and couple 1/4” to 3mm shafts. Learn More
    $8.62 AUD, inc GST
    AUD, inc GST
    delivered by
    Tue 28th of Nov

    $8.62 AUD

  3. Shaft Coupler - 1/4" to 5mm ROB-12325 Sparkfun Australia - Express Delivery Australia Wide

    Shaft Coupler - 1/4" to 5mm

    SKU: ROB-12325
    These stainless steel shaft couplers allow you to couple two size shafts together. They can be used for connecting motor shafts to drive shafts, or two different-sized shafts. These shaft couplers have a length of 0.75”, a outer diameter of 0.42”, and couple 1/4” to 5mm shafts. Learn More
    $8.62 AUD, inc GST
    AUD, inc GST
    delivered by
    Fri 24th of Nov

    $8.62 AUD

  4. Shaft Coupler - 1/4" to 6mm ROB-12211 Sparkfun Australia - Express Delivery Australia Wide

    Shaft Coupler - 1/4" to 6mm

    SKU: ROB-12211
    These stainless steel shaft couplers allow you to couple two size shafts together. They can be used for connecting motor shafts to drive shafts, or two different-sized shafts. These shaft couplers have a length of 0.75”, a outer diameter of 0.42”, and couple 1/4” to 6mm shafts. Learn More
    $8.62 AUD, inc GST
    AUD, inc GST
    delivered by
    Tue 28th of Nov

    $8.62 AUD

  5. Aluminum Flex Shaft Coupler - 5mm to 8mm ADA1176 Adafruit in Australia - Express Delivery Australia Wide

    Aluminum Flex Shaft Coupler - 5mm to 8mm

    SKU: ADA1176
    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 .. read more Learn More
    $8.50 AUD, inc GST
    AUD, inc GST
    delivered by
    Fri 24th of Nov

    $8.50 AUD

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