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24 Tooth Spline Servo to Shaft Couplers

  • Patented
  • attached to a Hitec servo
1 of 2
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A Servo to Shaft Coupler offers a simple and solid way to attach a shaft in line with the output spline of a servo. Each servo to shaft coupler is machined from 6061 T6 aluminum with a broached Acetal insert that snugly fits over the servo spline. Once installed onto the servo the coupler is then fastened to the servo using a servo screw (details on servo screw). The shaft can then be slid into place and clamped using the supplied 5-40 socket head screw (requires a 5/64” hex key). Offered in 24T and 25T splines. Patented


  • Handles over 1,500 oz-in. of torque without slipping
  • 6061 T6 Aluminum
  • Fits right onto servo spline
  • Offered in both 24T spline & 25T spline
24 Tooth Spline Servo to Shaft Couplers
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Pictures below show included hardware for the various couplers

HSA coupler 1

HSA coupler 2

HSA coupler 3




No servo screws included. Stock servo screw supplied with Hitec or Futaba servo should be used.

Coarse thread micro head screw
(for plastic gear servo) is included. Will not fit metal gear servo as no machine screw is supplied for this bore size.

Coarse thread micro head screw (for plastic gear servo) is included and a M2.6 x 8mm screw (for metal gear servo) are included.


Servo Shaft Coupler Schematic

Material 6061 T6 aluminum
Coupling Style clamping


Download Attachment
zipHSA125 STEP File(50.13 KB )Download
zipHSA156 STEP File(49.97 KB )Download
zipHSA187 STEP File(50.08 KB )Download
zipHSA250 STEP File(49.84 KB )Download
zipHSA312 STEP File(50.4 KB )Download
zipHSA375 STEP File(50.4 KB )Download
zipHSA4MM STEP File(49.84 KB )Download
zipHSA5MM STEP File(49.93 KB )Download
zipHSA6MM STEP File(52.82 KB )Download

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