# MyActuator RMD-X8-P20-120 Planetary Actuator

![MyActuator RMD-X8-P20-120 Planetary Actuator](https://parts.trymaglev.com/img/ac-myactuator-rmd-x8-p20-120.webp)

MyActuator's 120 N·m flagship planetary joint for humanoid hips/knees; Maglev's first-wave benchmark SKU.

- Maglev ID: ac-myactuator-rmd-x8-p20-120
- Brand: MyActuator
- MPN: RMD-X8-P20-120-E
- Category: actuators / Integrated Joint Actuators
- Origin: CN (maker HQ, factory not confirmed)
- Maker: Suzhou Micro Actuator Technology (MyActuator) (brand, CN)
- NDAA: unknown · Blue UAS: unknown · FCC: n/a
- HTS: 8501.31.40.00 (typical)
- MOQ: unknown · Lead time: unknown
- Confidence: VERIFIED

## Price
- 1+: $999 (list, 2026-10-29, https://myactuator.us/products/rmd-x-series/rmd-x8-p20-120; Official MyActuator USA store (myactuator.us); store states in stock / ships in 2-3 days for X8 (not allocation-verified).)

## Specifications
- Peak torque: 120 N·m
- Rated torque: 43 N·m
- Gear ratio: 19.612:1 planetary
- Voltage: 48 V input
- Mass: 1400 g
- Interface: CAN bus / EtherCAT (variant)
- Encoder: Dual absolute 17-bit input / 17-bit output
- Backlash: 10 arcmin

## Links
- Product: https://myactuator.us/products/rmd-x-series/rmd-x8-p20-120
- Datasheet: https://www.myactuator.com/downloads-xseries
- CAD: none

## Equivalents
- RobStride RS04 QDD Joint Actuator (ac-robstride-rs04)
- ENCOS EC-A8116-P1-18 Planetary Joint (ac-encos-ec-a8116-p1-18)
- CubeMars AK80-64 KV80 Robotic Actuator (ac-cubemars-ak80-64)
- MyActuator RMD-X8-P20-150-E-03 Planetary Actuator (ac-myactuator-rmd-x8-p20-150-e-03)

## Works with
- RLS AksIM-2 Off-Axis Absolute Rotary Encoder (ac-rls-aksim-2)

## Sources
- https://myactuator.us/products/rmd-x-series/rmd-x8-p20-120 (specs + USD price)