---
title: "RMD-X8-120 by MyActuator: specs, torque and price"
description: "Integrated Joint actuator from MyActuator (China). Peak torque 120 Nm, rated 43 Nm, weight 1400 g, torque density 85.7 Nm/kg, price $645."
canonical: https://getactuators.com/actuators/myactuator-rmd-x8-120
last-updated: 2026-09-26T20:29:50.000Z
---
# RMD-X8-120 by MyActuator

> Integrated Joint actuator from MyActuator (China). Peak torque 120 Nm, rated 43 Nm, weight 1400 g, torque density 85.7 Nm/kg, price $645.

## Specifications

| Spec | Value |
| --- | --- |
| Category | Integrated Joint |
| Peak torque | 120 Nm |
| Rated torque | 43 Nm |
| Max speed | 127 rpm |
| Gear ratio | 20:1 |
| Weight | 1400 g |
| Torque density | 85.7 Nm/kg |
| Price | $645 |
| Price per Nm | $5.4 |
| Backdrivable | no |
| Backlash | n/a |
| Voltage | 24-48 V |
| Peak current | n/a |
| Communication | CAN, EtherCAT |
| Control modes | position, velocity, torque |
| Encoder | dual 18-bit magnetic |
| Integrated driver | yes |
| Availability | in production |
| Data status | verified against sources |

## Use cases

- robot arm
- humanoid joint
- agv

## Notes

High-torque, large-hollow-bore planetary joint for arm base/humanoid joints. RMD-X8-P20-120: 120 N.m peak, 43 N.m rated, 127 rpm rated speed, 574 W, 1.40 kg per OpenELAB/RobotShop. Actual reduction ~19.6:1 (nominal 20:1). One reseller lists 110 N.m peak. EtherCAT and CAN driver variants.

## Sources

- <https://www.robotshop.com/products/myactuator-myactuator-brushless-dc-motor-rmd-x8-120-ethercat-large-torque-120nm-robot-joint-module-large-hollow-planetary-reduction-torque>
- <https://www.dingsmotionusa.com/rmd-x8-120>
- <https://openelab.io/products/myactuator-rmd-x8-p20-actuator>

## Similar Integrated Joint actuators

- [RobStride 04 (RobStride)](https://getactuators.com/actuators/robstride-04): 84.5 Nm/kg
- [GIM6010-36 (48V) (Steadywin)](https://getactuators.com/actuators/steadywin-gim6010-36): 71.4 Nm/kg
- [RobStride 03 (RobStride)](https://getactuators.com/actuators/robstride-03): 66.7 Nm/kg
- [RobStride 00 (RobStride)](https://getactuators.com/actuators/robstride-00): 45.2 Nm/kg
- [RobStride 01 (RobStride)](https://getactuators.com/actuators/robstride-01): 44.7 Nm/kg

## Machine-readable

- JSON: https://getactuators.com/api/v1/actuators/myactuator-rmd-x8-120
- Catalog index for agents: https://getactuators.com/llms.txt