Boston Dynamics is shipping a redesigned four-fingered hand for its Atlas humanoid robot, built around a set of engineering tradeoffs that prioritize manufacturability and durability over anthropomorphic aesthetics1,2.
The new hand carries 13 degrees of freedom, nearly doubling the seven in the previous three-fingered design. Boston Dynamics eliminated the pinky finger to "reduce cost, size, and failure points". Dense tactile pressure sensors give the hand enough feedback to grasp and operate real-world tools; a demonstration video shows Atlas changing a drill bit.
Design for scale
The prior Atlas hand "was never intended for mass production in the tens or hundreds of thousands," the company said. The replacement is designed with that volume in mind. Actuators are embedded directly into the joints in a direct-drive configuration, with no delicate tendons or cables crossing joints to stretch and break. Each actuator pack is a single unit that can be swapped out for field repair. A transmission allows the motors to be back-driven, letting the hand react to force and contact.
"Hands are a ruthless design tradeoff," said Alberto Rodriguez, Director of Robot Behavior at Boston Dynamics. The company said the hand uses fewer, larger, and more powerful actuators than the slimmer, more human-like designs favored by competing humanoid-robotics firms. Boston Dynamics added the ability for the fingers to splay open, and said the form factor is close enough to a human hand that human demonstrations can be used to train it.
Learning and tooling
Boston Dynamics said the hand uses reinforcement learning to discover uses for its extra motions and exploit them. The company listed a set of requirements the design is meant to satisfy: tool use, clean simulation, ruggedness, and mass manufacturing and repair at reliably low cost. It said the hand can hold the handle of a tool with a trigger.
ANALYSIS The explicit pivot from research hardware to a production-oriented design, with modular actuator packs and no cable-based tendons, marks a concrete step toward deploying Atlas outside controlled lab settings. The choice to sacrifice a finger for reliability and cost rather than match the five-fingered hands shown by competitors draws a clear line between demonstration-grade dexterity and field-grade endurance.
Boston Dynamics said the hand "should be able to do everything it needs it to do for the foreseeable horizon". The announcement was reported on October 1, 2026.