---
title: "EC-A4315-P2-36 vs RMD-X8-120"
description: "Compare EC-A4315-P2-36 and RMD-X8-120: catalog torque, mass, speed, price and source/revision caveats. Not a matched-condition test or compatibility recommendation."
canonical: https://actuatorlist.com/comparisons/encos-ec-a4315-p2-36-vs-myactuator-rmd-x8-120
last-updated: 2026-11-01T14:05:43.000Z
---
# EC-A4315-P2-36 vs RMD-X8-120

Compare EC-A4315-P2-36 and RMD-X8-120: catalog torque, mass, speed, price and source/revision caveats. Not a matched-condition test or compatibility recommendation. Unknown means not documented, not zero.

## EC-A4315-P2-36

![EC-A4315-P2-36: illustrative catalog photo; revision/variant unconfirmed](/actuator-images/encos-ec-a4315-p2-36.webp)

[Catalog and sources](/actuators/encos-ec-a4315-p2-36)

## 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)

## Specifications

| Specification | EC-A4315-P2-36 | RMD-X8-120 |
| --- | --- | --- |
| Peak torque (catalog) | 75 N·m | 120 N·m |
| Rated torque (catalog) | 25 N·m | 43 N·m |
| Maximum speed (catalog) | 117 rpm | 127 rpm |
| Mass | 485 g | 1400 g |
| Gear ratio | 36:1 | 20:1 |
| Voltage | 48 V | 24-48 V |
| Price (catalog, not a live quote) | 750 USD | 645 USD |
| Encoder (resolution is not accuracy) | dual encoder | dual 18-bit 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.

EC-A4315-P2-36: Unverified catalog: confirm sources. 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.

RMD-X8-120: 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: EC-A4315-P2-36 (75 N·m) minus RMD-X8-120 (120 N·m) = -45 N·m.
- Rated torque: EC-A4315-P2-36 (25 N·m) minus RMD-X8-120 (43 N·m) = -18 N·m.
- Maximum speed: EC-A4315-P2-36 (117 rpm) minus RMD-X8-120 (127 rpm) = -10 rpm.
- Mass: EC-A4315-P2-36 (485 g) minus RMD-X8-120 (1400 g) = -915 g.

## Catalog source links

### EC-A4315-P2-36 / catalog sources

[Catalog-linked product page](https://aifitlab.com/products/encos-ec-a4315-p2-36-motor)

### 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)

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