Robot Joint Motor Comparison (2026)
Compare quasi-direct-drive (QDD) robot joint actuators for 2026: RobStride, DAMIAO, CubeMars, and MyActuator — price, torque class, and which to pick for legged robots, arms, and exoskeletons. Buy in the US.
← Learn / Buying Guide
Quasi-direct-drive (QDD) actuators are the joints of modern legged robots, force-controlled arms, and exoskeletons. Here's how the four brands US builders actually buy — RobStride, DAMIAO, CubeMars, and MyActuator — compare on price and where each fits, with live US pricing.
Price & fit at a glance
| Brand / example | US price (from) | Class | Best for | Buy |
|---|---|---|---|---|
| DAMIAO DM-J4310 | ~$179 | Light QDD | Budget arms, education, SO-ARM builds | Store → |
| RobStride RS-00 / RS-03 | $198 / $322 | Light–mid QDD | Legged robots, low-cost dual-arm | RS-03 → |
| CubeMars AK70-10 / AK80-9 | ~$570 / ~$830 | Mid QDD | Quadrupeds, well-documented ecosystem | AK70-10 → |
| DAMIAO DM-J8009 | ~$550 | High-torque QDD | Hips/knees, humanoid legs | Store → |
| MyActuator RMD-X series | quote | Mid–high QDD | Industrial joints (not stocked — ask us) | Ask → |
Prices are current US list from Robotics Center; torque and gear ratio vary by model — see each product page for full specs. We stock CubeMars, DAMIAO, and RobStride and ship from San Francisco.
How to choose
- Cheapest capable joint → DAMIAO DM-J series or RobStride RS — great for SO-ARM/LeRobot builds and education.
- Best ecosystem / documentation → CubeMars AK series (widely used in open quadruped/exo projects).
- High torque for humanoid legs → DAMIAO DM-J8009 / larger CubeMars AK80.
- Everything is QDD + backdrivable — pick by peak torque for your joint and by CAN-FD vs. the control stack you already use.
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