The EMAX ES9055II pairs non-contact magnetic-encoder feedback with an all-metal case and gear train, delivering up to 35 kgf·cm for high-load aircraft, helicopter and robotic control.
Maximum torque35 kgf·cmAt 8.4V
Maximum speed0.12 secPer 60° at 8.4V
FeedbackMagneticContactless encoder
HV range6.0–8.4V2S-capable system range
01 / Performance by voltage
Choose the torque your load demands.
Published torque and transit speed are paired at every rated voltage, helping you size the linkage and power system with less guesswork.
Power-system check: Size the receiver, BEC, wiring and battery path for the servo's approximately 4.0–5.5A stall-current reference range.
6.0VControlled authority
Stall torque25 kgf·cm
Transit speed0.17 sec/60°
7.4V2S nominal
Stall torque30 kgf·cm
Transit speed0.14 sec/60°
8.4VFull rated output
Stall torque35 kgf·cm
Transit speed0.12 sec/60°
02 / High-load control
More holding authority where leverage works against you.
For larger control surfaces and loaded mechanisms, the ES9055II prioritizes torque and positional control. Its magnetic encoder continuously reports position without a sliding feedback contact, supporting repeatable centering through vibration and long duty cycles.
01
35 kgf·cm at 8.4V
High holding torque for demanding linkages, control surfaces and articulated joints.
02
Magnetic feedback
Contactless sensing is designed for consistent centering under vibration and repeated motion.
03
All-metal drivetrain
Metal gears and housing support load transfer while helping dissipate operating heat.
03 / Application fit
Built for mechanisms that ask more from a standard-size servo.
Heavy-duty fixed wingHigh holding torque for larger primary control surfaces and demanding linkage geometry.
High-load helicoptersMagnetic feedback and an all-metal drivetrain for vibration-intensive control roles.
Robotic joints180° or full-range 360° positional control for loaded articulated mechanisms.
Custom automationStandard PWM input for fixtures, rotating mechanisms and repeated-position tasks.
04 / Specifications and fitment
Verify the interface before installation.
Servo type
Magnetic encoder / brushed / digital / all-metal
Operating voltage
6.0–8.4V
Speed at 6.0 / 7.4 / 8.4V
0.17 / 0.14 / 0.12 sec/60°
Stall torque at 6.0 / 7.4 / 8.4V
25 / 30 / 35 kgf·cm
Stall current
Approx. 4.0–5.5A typical reference range
Rotation
180° ±2°; supports 360° full-range positional control
PWM range
500–2500μs
Connector
JR
Output spline
23T
Dimensions
Approx. 40 × 20 × 38.5 mm
Net weight
78.5 ±1g
Confirm 23T horn compatibility
Confirm the servo bay accepts a 40 × 20 mm footprint
Confirm receiver/BEC voltage does not exceed 8.4V
Confirm the power path supports servo peak current
Center electronically before installing the horn
Set endpoints to prevent linkage binding
Important: “360° positional control” is not uncontrolled continuous rotation. The controller must support the required pulse range and position mode.
05 / Compatibility FAQ
Answers before installation.
Will it work with a standard PWM receiver?
Yes. The ES9055II uses a JR connector and 500–2500μs PWM control. Confirm that the receiver or controller supports the travel range required by your setup.
Can I run it from a 2S LiPo system?
The 6.0–8.4V rating covers the nominal and fully charged voltage of a 2S LiPo system. The receiver, BEC, wiring and every connected device must also be rated for the selected voltage and current demand.
Why choose the ES9055II over a faster servo?
The ES9055II emphasizes torque and holding authority, reaching 35 kgf·cm at 8.4V. It is a strong fit when the mechanism's load and leverage matter more than minimum transit time.
Is the ES9055II brushless?
No. The verified specification identifies a brushed motor with digital control, a magnetic encoder, metal gears and an all-metal housing.
What is included?
One ES9055II servo, a servo-horn and mounting-hardware kit, and a user instruction manual.
