Product overview
The Zhuhai SV Tech Co., Ltd. AXR 8840 MG-D is a standard servo for model steering, control surfaces and mechanical actuators. Its configuration combines a coreless motor, stainless steel gears and two bearings in a 40 × 20 × 36.6 mm body weighing 70 g. A 300 mm cable supports connection to the installation. Integration requires matching the supply, mounting holes and servo-arm connection, with the final mounting drawing and interface version establishing the dimensions needed for fabricated brackets.
The servo accepts 4.8–8.4 V and uses PWM control at 333 Hz. At 8.4 V, it delivers 45 kg·cm stall torque with a no-load speed of 0.1 s/60°; stall current reaches 6.3 A. Continuous-load selection must use the rated torque of 16 kg·cm at 7.4 V together with duty cycle. The specified 1520 µs reference pulse differs from the 1500 µs positional midpoint, so center and usable travel depend on the controller and delivered version. Power provision must accommodate transient current, and the mechanism must avoid sustained loading against its stops.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity and purpose | AXR 8840 MG-D standard servo for model steering, control surfaces and mechanical actuation. |
| Operating voltage | 4.8–8.4 V |
| Performance at 5 V |
|
| Performance at 6 V |
|
| Performance at 7.4 V |
|
| Performance at 8.4 V |
|
| Rated torque | 16 kg·cm @ 7.4 VSupply voltage: 7.4 V. |
| Overall dimensions | 40 × 20 × 36.6 mm |
| Weight | 70 g |
| Motor type | Coreless motor |
| Gear material | Stainless steel gears |
| Bearing count | 2 |
| Cable length | 300 mm |
| Control signal | PWM |
| Operating frequency | 333 Hz |
| Reference pulse width | 1520 µs |
| Pulse width and corresponding angle | 500 / 1500 / 2500 µs → -90 / 0 / 90° |
| Center and travel qualification | The 1520 µs reference pulse and 1500 µs positional midpoint are both specified; establish the center and usable travel for the controller and delivered version.Controller and delivered servo version determine the center position and usable travel. |
| Stall torque limitation | Stall torque is not a continuous-load rating.Continuous-load selection requires rated torque and duty cycle. |
| Voltage coverage limitation | The operating voltage range defines permissible supply voltage.Supply range: 4.8–8.4 V. |
| Mounting dimensions qualification | Drawings and the specification table may use different dimensional references; establish the final mounting drawing and interface version before fabricating mounts.Mounting fabrication depends on the final installation drawing and interface version. |
| Initial integration procedure | Check power, signal pulse width, mounting holes and servo-arm connection; establish center, motion direction and mechanical travel before progressively applying the working load.Initial setup with the load removed or limited. |
| Electrical and mechanical integration constraints | Allow supply headroom for transient current and avoid cable voltage drop, reversed connections and sustained loading against mechanical stops.Power supply sized for transient current. |
| Specification basis and date | AXR 2026 product documentation; performance organized by test voltage; dated 2026-09-24.Performance organized by test voltage. |
