The humanoid robot supply chain — who makes the ~40 components inside

Foundation models & robot AI

The big AI models that act as the robot's “brain,” turning a spoken or typed goal into movement. A “vision-language-action” model is one that can see, follow instructions in plain language, and act on them.

Why it matters This is the software layer that's hardest for rivals to copy, and the same model can run across many different robots — so it shapes how capable a robot is, not just what it costs.

Onboard compute & AI chips

The AI chips inside the robot — called “edge-AI” chips because they do the thinking on the robot itself, not in the cloud — that run its vision and control in real time.

Why it matters A handful of chipmakers supply nearly every humanoid, and the same chips power countless other machines, so they're slow to go obsolete — which helps a used robot keep its value.

Force, torque, tactile & inertial sensors

The sensors that let a robot feel contact, measure how hard it's pushing or gripping, and track its own balance and motion.

Why it matters Every joint and fingertip needs them, so they're steady, high-volume parts that multiply with how many ways a robot can move.

⚠ Why it's hard to get — Goldman Sachs research flags tactile sensors for advanced dexterous hands as a supply constraint, requiring custom sensor arrays that are not yet produced at scale. source

Machine vision, depth cameras & LiDAR

The cameras and depth sensors — including LiDAR, which measures distance with laser pulses — that let the robot see and map the space around it.

Why it matters This hardware is shared with cars and drones, giving suppliers big scale, while sharper 3-D sensing is a genuine point of difference between robots.

Integrated actuators & assembly

The “actuators” — the motorized joints that actually move the robot — and the firms that assemble motor, gears and electronics into a single joint module at car-industry scale.

Why it matters Actuators are usually the single most expensive system in a humanoid — about 40–60% of its parts cost — so whoever can build them well and cheaply shapes the robot's price more than anyone.

Precision gearboxes & reducers

The special gears — called “reducers” — that turn a small, fast motor into slow, powerful joint movement. The hardest kind to make is the harmonic (strain-wave) reducer; others are cycloidal and planetary.

Why it matters These gears are the hardest part of a humanoid to mass-produce and a big slice of each joint's cost, which is why only a handful of suppliers can make them at quality.

⚠ Why it's hard to get — These gears are the hardest part of a humanoid to mass-produce: there are roughly 20 in each robot, they need scarce high-precision grinding machines, and only a few factories worldwide can make them well — so Goldman Sachs flags them as a key limit on building robots in large numbers. source

Ball/roller screws & precision bearings

The roller screws, ball screws and precision bearings — the parts that turn a motor's spin into a strong, straight push, and that carry the load inside each joint.

Why it matters Roller screws are precision parts with few qualified makers, and a humanoid is full of bearings, so both are recurring, capacity-constrained content.

⚠ Why it's hard to get — Roller screws — the precision parts that turn a motor's spin into a strong straight push — are a supply pinch point: they need specialised machines and know-how, few makers qualify, and they can be roughly a third of the cost of all a robot's parts. source

Electric motors

The brushless electric motors that are the prime mover inside almost every joint. Many are “frameless” — just the motor's core, built straight into the joint to save space.

Why it matters How light and strong each joint can be comes down to the motor, and the world's big motor makers already build these at enormous scale.

Dexterous hands & end-effectors

The multi-fingered robot hands and grippers — an “end-effector” is whatever sits on the end of the arm — that let a humanoid pick things up and use tools.

Why it matters Hands are the hardest part of a robot to get right and cram the most motors and sensors into the least space — high difficulty and high parts content, with China currently ahead.

Motor drivers & power electronics

The “driver” chips that control each motor and manage power efficiently — increasingly using GaN and SiC chips, faster and more efficient types of power chip.

Why it matters Every motorized joint needs a driver, so these are broad, steady parts shared with electric cars and factory equipment — a large, well-supplied market.

Batteries & battery management (BMS)

The lithium-ion battery — the same type used in phones and EVs — plus the “BMS” (battery-management system), the electronics that protect the pack and track its health.

Why it matters Battery capacity fades with charge cycles, making it one of the biggest factors in what a used robot is worth; the cell makers are the same giants that supply electric cars.

⚠ Why it's hard to get — Batteries are a whole-robot constraint: a humanoid can only carry so much weight in battery — very roughly an eighth of its body weight — so today's robots tend to run only about 2–4 hours and often need battery swaps or charging breaks. source

Rare-earth magnets & materials

The rare-earth magnets — the powerful magnets inside every electric motor — and the mined materials they're made from.

Why it matters The magnet, not the battery, is the scarce and politically-sensitive input: China makes the large majority of them, so the few producers elsewhere matter a lot to supply.

⚠ Why it's hard to get — Rare-earth permanent magnets (NdFeB) are widely identified as a supply bottleneck for humanoid robots, as China controls over 90% of magnet manufacturing and scaling robot production would require many times current global magnet output. source