---
title: "RMD-X8-120 vs RobStride 04"
description: "Compare RMD-X8-120 and RobStride 04: catalog torque, mass, speed, price and source/revision caveats. Not a matched-condition test or compatibility recommendation."
canonical: https://actuatorlist.com/comparisons/myactuator-rmd-x8-120-vs-robstride-04
last-updated: 2026-11-01T14:05:43.000Z
---
# RMD-X8-120 vs RobStride 04

Compare RMD-X8-120 and RobStride 04: catalog torque, mass, speed, price and source/revision caveats. Not a matched-condition test or compatibility recommendation. Unknown means not documented, not zero.

## RMD-X8-120

![RMD-X8-120: illustrative catalog photo; revision/variant unconfirmed](/actuator-images/myactuator-rmd-x8-120.webp)

[Catalog and sources](/actuators/myactuator-rmd-x8-120)

## RobStride 04

![RobStride 04: illustrative catalog photo; revision/variant unconfirmed](/actuator-images/robstride-04.webp)

[Catalog and sources](/actuators/robstride-04)

## Specifications

| Specification | RMD-X8-120 | RobStride 04 |
| --- | --- | --- |
| Peak torque (catalog) | 120 N·m | 120 N·m |
| Rated torque (catalog) | 43 N·m | 40 N·m |
| Maximum speed (catalog) | 127 rpm | 200 rpm |
| Mass | 1400 g | 1420 g |
| Gear ratio | 20:1 | 9:1 |
| Voltage | 24-48 V | 15-60 V |
| Price (catalog, not a live quote) | 645 USD | 255 USD |
| Encoder (resolution is not accuracy) | dual 18-bit magnetic | dual magnetic |
| Complete actuator efficiency | Unknown: not documented | Unknown: not documented |
| Cooling / thermal duty | Unknown: not documented | Unknown: not documented |
| Loaded repeatability | Unknown: not documented | Unknown: not documented |
| Calibrated simulation model | Unknown: not documented | Unknown: not documented |

Sensor bits do not establish loaded accuracy. CAD geometry is not a calibrated simulation model. Verify thermal conditions, duty and exact revision before engineering use.

Catalog photo; illustrative. Confirm hardware revision/variant.

Catalog headline specs spot-checked: confirm revision. The legacy verified flag is a catalog spot-check, not verification of every field, installed revision or independent performance validation. Catalog entry only; confirm the exact revision and operating conditions with the linked source.

## Arithmetic from catalog values

Differences are subtraction of retained catalog values, not measured advantages. Ratings may have different test conditions. Unknown means not documented; manufacturer claims and catalog spot-checks are not independent validation.

- Peak torque: RMD-X8-120 (120 N·m) minus RobStride 04 (120 N·m) = 0 N·m.
- Rated torque: RMD-X8-120 (43 N·m) minus RobStride 04 (40 N·m) = 3 N·m.
- Maximum speed: RMD-X8-120 (127 rpm) minus RobStride 04 (200 rpm) = -73 rpm.
- Mass: RMD-X8-120 (1400 g) minus RobStride 04 (1420 g) = -20 g.

## Catalog source links

### RMD-X8-120 / catalog sources

[Catalog-linked product page](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) · [Catalog-linked datasheet](https://www.dingsmotionusa.com/rmd-x8-120)

### RobStride 04 / catalog sources

[Catalog-linked product page](https://www.seeedstudio.com/Robostride-04-Actuator-p-6775.html) · [Catalog-linked datasheet](https://openelab.io/blogs/learn/robstride04-qdd-120n-m-integrated-joint-bldc-gear-motor-complete-guide)

## Related 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-A4315-P2-36 vs RMD-X8-120](/comparisons/encos-ec-a4315-p2-36-vs-myactuator-rmd-x8-120)
- [EC-A6416-P2-25 vs RMD-X8-120](/comparisons/encos-ec-a6416-p2-25-vs-myactuator-rmd-x8-120)
- [EC-A6416-P2-25 vs RobStride 04](/comparisons/encos-ec-a6416-p2-25-vs-robstride-04)

[Browse actuator comparisons](/compare).

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