# RobStride RS04 QDD Joint Actuator

![RobStride RS04 QDD Joint Actuator](https://parts.trymaglev.com/img/ac-robstride-rs04.webp)

Highest-torque RobStride QDD joint (120 N·m peak) for humanoid hips and knees; rated 40 N·m only with a 345x345 mm aluminium plate (35 N·m with 220x200 mm).

- Maglev ID: ac-robstride-rs04
- Brand: RobStride
- MPN: RS04
- Category: actuators / Integrated Joint Actuators
- Origin: CN (maker HQ, factory not confirmed)
- Maker: Beijing Lingzu Shidai Technology (RobStride, 北京灵足时代科技) (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+: ≈$168.87 (list, 2026-10-29, https://github.com/RobStride/Product_Information/blob/main/README.md; CNY 1199 in RobStride catalog dated 2026-07-13; maker lists CNY; USD is a conversion at an assumed ~7.10 CNY/USD, not a USD quote)

## Specifications
- Peak torque: 120 N·m
- Rated torque: 40 N·m (with specified heat-sink plate)
- Gear ratio: 9:1 planetary
- Voltage: 48 V rated (15-60 V)
- Mass: 1420 g
- Interface: CAN (RobStride CAN/CANopen protocol docs)

## Links
- Product: https://robstride.com/
- Datasheet: https://github.com/RobStride/Product_Information/blob/main/README.md
- CAD: none

## Equivalents
- MyActuator RMD-X8-P20-120 Planetary Actuator (ac-myactuator-rmd-x8-p20-120)
- ENCOS EC-A8116-P1-18 Planetary Joint (ac-encos-ec-a8116-p1-18)
- CubeMars AK80-64 KV80 Robotic Actuator (ac-cubemars-ak80-64)
- Synapticon ACTILINK-JD Circulo 12 Dynamic Actuator (ac-synapticon-actilink-jd-circulo-12)

## Sources
- https://github.com/RobStride/Product_Information/blob/main/README.md (specs + CNY catalog price (spec dated 2026-07-13))