# RobStride RS03 QDD Joint Actuator

![RobStride RS03 QDD Joint Actuator](https://parts.trymaglev.com/img/ac-robstride-rs03.webp)

Integrated planetary quasi-direct-drive joint (motor, 9:1 planetary, driver, dual encoders) for legged and humanoid builders who want the low-cost Chinese QDD class.

- Maglev ID: ac-robstride-rs03
- Brand: RobStride
- MPN: RS03
- 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+: ≈$140.70 (list, 2026-10-29, https://github.com/RobStride/Product_Information/blob/main/README.md; CNY 999 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: 60 N·m
- Rated torque: 21 N·m (with specified heat-sink plate)
- Gear ratio: 9:1 planetary
- Voltage: 48 V rated (15-60 V)
- Mass: 900 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
- CubeMars AK10-9 V3.0 KV60 Robotic Actuator (ac-cubemars-ak10-9-v3)
- MyActuator RMD-X6-P20-60 Planetary Actuator (ac-myactuator-rmd-x6-p20-60)
- Damiao DM-J8009-2EC Joint Motor (ac-damiao-dm-j8009-2ec)
- CubeMars AK70-9 V3.0 KV60 Robotic Actuator (ac-cubemars-ak70-9-v3)
- EYOU RP70H Planetary Joint Module (ac-eyou-rp70h)

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