Unitree Dex5-S Human-sized Biomimetic Robotic Hand

The Unitree Dex5-S is a human-sized biomimetic robotic hand featuring 22 active degrees of freedom (DoF) across 22 direct-drive electric motors, completely removing the need for a tendon-driven system. Unveiled by Unitree Robotics in September 2026 as the successor to the older Dex5-1, it is explicitly built at a 1:1 human hand scale to enable natural, precise object manipulation on humanoid robot platforms.

Unitree Dex5-S Human-sized Biomimetic Robotic Hand Core Specifications:

* Degrees of Freedom (DoF) : 22 active DoF across 22 independent backdrivable motors

* Finger DoF Breakdown: Thumb: 5 DoF | Index: 4 DoF | Middle: 4 DoF | Ring: 4 DoF | Little (Pinky): 5 DoF

* Form Factor / Size: 1:1 adult human hand scale

* Total Weight: ~620 grams

* Continuous Payload: 1 kg

* Maximum (Peak) Payload: 2 kg (with grasp loads reported up to 4.5 kg depending on grip type)

* Control Frequency: Up to 1,000 Hz utilizing dual-encoder control

* Shell Material: Lightweight aluminum alloy

Key Structural & Safety Features
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• Pinky Roll Joint: Unlike traditional robot hands, the little finger has a unique fifth axis allowing it to roll inward. This enables the hand to form a natural cupping shape to safely wrap around real-world objects like bottles, tools, and cans.

• Smooth Backdrivability: Every joint is fully backdrivable, meaning the fingers yield to external forces instead of staying completely rigid, protecting both the hand and surrounding objects during unexpected contact.

• Limit-Impact Torque Protection: Built-in safeguards instantly prevent mechanical damage if a joint hits its physical travel limit or experiences a sudden knock.

• Full Data Feedback: The system outputs exhaustive telemetry data, including granular tracking for joint position, speed, torque, temperature, operating voltage, and current.

• Sensor & Hardware Add-ons: The Pro version supports integrated tactile sensing (touch feedback), and the structural framework natively supports direct connections for a palm camera.