Spektrum A4020 Micro Digital Aircraft Metal Gear Servo

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This is the Spektrum A4020 Micro Digital Aircraft Metal Gear Servo. The A4020's extremely tough metal gear train, class-leading speed, digital precision and incredible 42 oz-in of torque is ideal for 15 to 25 size aircraft. The A4020 is the ultimate combination of lightweight and holding power performance at a great price.


  • Size Category: Minis and Micros
  • Type: Digital
  • Application: 15-25 size aircraft
  • Torque:
    • 35 oz-in (2.5kg-cm) @ 4.8V
    • 42 oz-in (3.0kg-cm) @ 6.0V
  • Speed:
    • 0.14 sec/60 @ 4.8V
    • 0.11 sec/60 @ 6.0V
  • Length: 1.1 in (28.0mm)
  • Width: 0.5 in (12.7mm)
  • Height: 1.07 in (27.4mm)
  • Weight: 0.7 oz (20g)
  • Bushing Or Bearing: Bearing
  • Bearing: Single
  • Motor Type: 5-pole ferrite
  • Connector Type: Z connector
  • Gear Type: Metal

This product was added to our catalog on March 7, 2011.

Tiejun Wang
Verified Owner
Monday, Sep 19 2011 (about 4 years ago)
Spektrum A4020 Micro Digital Aircraft Metal Gear Servo
Not recommended. Slow and always hesitating. This is not a 0.11s servo, in no way does it compare to my Futaba S9071SB(same speed spec). When slowly moving the stick on my T8FG, the servo arm trembles here and there. Internal check shows poor solder joints, looks very similar to my Emax digital servos which do the same trembling thing. None of my other servos do this. Control boards are exactly identical to the Emax. The PP package box does look&feel good though, which will make a nice screw box. This is a rebranded & repacked "cheapy" Emax. I replaced the control board with a PCB from my stripped Corona DS939mg and it works well now, though still slow.

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