---
title: "RobStride 04 specs"
description: "Integrated Joint actuator from RobStride (China). Peak torque 120 Nm, rated 40 Nm, weight 1420 g, torque density 84.5 Nm/kg, price $255."
canonical: https://actuatorlist.com/actuators/robstride-04
last-updated: 2026-11-01T14:05:43.000Z
---
# RobStride 04 by RobStride

> Integrated Joint actuator from RobStride (China). Peak torque 120 Nm, rated 40 Nm, weight 1420 g, torque density 84.5 Nm/kg, price $255.

## Specifications

| Spec | Value |
| --- | --- |
| Category | Integrated Joint |
| Peak torque | 120 Nm |
| Rated torque | 40 Nm |
| Max speed | 200 rpm |
| Gear ratio | 9:1 |
| Weight | 1420 g |
| Torque density | 84.5 Nm/kg |
| Price | $255 |
| Price per Nm | $2.1 |
| Backdrivable | yes |
| Backlash | n/a |
| Voltage | 15-60 V |
| Peak current | n/a |
| Communication | CAN |
| Control modes | position, velocity, torque, mit |
| Encoder | dual magnetic |
| Integrated driver | yes |
| Availability | in production |
| Data status | Catalog headline specs spot-checked: confirm revision |

## Size a joint

- [Motor torque calculator](/tools/motor-torque-calculator?solve=power&t=40&n=200): **838 W** of shaft power at its rated 40 N·m and 200 rpm.
- [Robot arm torque calculator](/tools/robot-arm-torque-calculator?L=0.4,0.35,0.12&m=1.2,0.8,0.3&a=1.42,0.5,0&p=2): **35.6 N·m** at the shoulder with its 1420 g at the elbow of a 2 kg-payload arm.
- [Humanoid robot actuators](/guides/humanoid-robot-actuators#ankle): **5 of 7 joints** within its rated torque, up to the ankle at 38.4 N·m.

## Use cases

- robot arm
- humanoid joint
- quadruped leg

## Notes

Largest mainstream RobStride QDD module. 120 N.m peak, 40 N.m rated, 9:1 reduction, size 110x50 mm, 15-60 V driver working voltage, CAN, dual magnetic encoders. Installed mass 1420 g (1.4 kg) per RobStride/Seeed/OpenELAB. Priced at $255 on Seeed Studio (authorized RobStride distributor, USD). No-load speed 200 rpm +/-10% at 48 V per RobStride RS04 user manual 260713.

## Sources

- [https://www.seeedstudio.com/Robostride-04-Actuator-p-6775.html](https://www.seeedstudio.com/Robostride-04-Actuator-p-6775.html)
- [https://openelab.io/blogs/learn/robstride04-qdd-120n-m-integrated-joint-bldc-gear-motor-complete-guide](https://openelab.io/blogs/learn/robstride04-qdd-120n-m-integrated-joint-bldc-gear-motor-complete-guide)
- [https://x.com/RobStride\_com/status/1802891697912737824](https://x.com/RobStride_com/status/1802891697912737824)
- [https://github.com/RobStride/Product\_Information](https://github.com/RobStride/Product_Information)
- [https://www.robstride.com/products/robStride04](https://www.robstride.com/products/robStride04)
- [https://github.com/RobStride/Product\_Information/blob/main/Product%20Literature/RS04/RS04User%20Manual260713.pdf](https://github.com/RobStride/Product_Information/blob/main/Product%20Literature/RS04/RS04User%20Manual260713.pdf)

## Similar Integrated Joint actuators

- [EC-A4315-P2-36 (ENCOS)](https://actuatorlist.com/actuators/encos-ec-a4315-p2-36): 154.6 Nm/kg
- [EC-A6416-P2-25 (ENCOS)](https://actuatorlist.com/actuators/encos-ec-a6416-p2-25): 149.1 Nm/kg
- [DM-J6248P-2EC (DAMIAO (DMBots))](https://actuatorlist.com/actuators/damiao-dm-j6248p-2ec): 147 Nm/kg
- [EC-A4310-P2-36 (ENCOS)](https://actuatorlist.com/actuators/encos-ec-a4310-p2-36): 94.2 Nm/kg
- [RMD-X8-120 (MyActuator)](https://actuatorlist.com/actuators/myactuator-rmd-x8-120): 85.7 Nm/kg

## Catalog comparisons

Catalog specifications and source caveats, not compatibility recommendations.

- [DM-J6248P-2EC vs RobStride 04](/comparisons/damiao-dm-j6248p-2ec-vs-robstride-04)
- [EC-A6416-P2-25 vs RobStride 04](/comparisons/encos-ec-a6416-p2-25-vs-robstride-04)
- [RMD-X8-120 vs RobStride 04](/comparisons/myactuator-rmd-x8-120-vs-robstride-04)

[Browse actuator comparisons](/compare).

## Machine-readable

- JSON: https://actuatorlist.com/api/v1/actuators/robstride-04
- Catalog index for agents: https://actuatorlist.com/llms.txt