China's Humanoid Actuator Suppliers: The $12B Muscle Market Inside Every Humanoid

Strip a humanoid to its anatomy and you find one dominant cost: the actuators. Analysts at Morgan Stanley put actuators near 56% of a humanoid's bill of materials; other 2026 estimates range from 40% to 50%. A typical full-size robot carries about 30 actuators — 16 rotary and 14 linear — and every one is a precision module of motor, reducer, encoder, torque sensor and driver. For years this muscle belonged to Western and Japanese motion-control houses. Today the world's largest humanoid supply chain — more than 140 complete-machine companies and 330 product releases in China in 2025 — runs on Chinese actuators.

Why actuators dominate the BOM

An actuator is not a single part; it is the joint itself. Rotary joints take torque from a frameless torque motor through a harmonic or planetary reducer; linear joints convert rotation into push-pull motion via planetary roller screws. High-power joints now exceed 530 N·m at the output. Because every joint needs its own actuator, the cost scales with the robot's degrees of freedom — which is why the industry's flagship cost-down strategy is the integrated joint module: motor, reducer, encoder, torque sensor and driver fused into one housing, replacing the three-part drivetrain and cutting both price and weight. Chinese makers pushed integrated module prices from multi-thousand-dollar precision instruments to sub-1,000-RMB standard components.

The Chinese lineup

Tuopu — the actuator kingpin

Tuopu Group (601689) is the clearest winner of the humanoid actuator race. It supplies linear and rotary actuator assemblies to Tesla Optimus, AgiBot and Xiaomi — Tesla alone accounts for 35-40% of its revenue — and has expanded into dexterous-hand motors, structural body parts, sensors, foot dampers and electronic flexible skin. Its Mexico factory is already in production with a capacity target of 300,000 sets in Q2 2026. Daiwa named Tuopu a top buy among humanoid actuator names, citing mass-production nominations and scalable cost reduction.

Sanhua — the $685M order

Sanhua Intelligent Controls (002050), the HVAC and EV thermal-components giant, crossed into humanoid actuators so successfully that in October 2025 Tesla placed a reported $685M actuator order — sending Sanhua's stock to the daily limit and igniting the whole A-share robot chain. As one of the core joint-module suppliers for Optimus, Sanhua transfers its mechatronics and thermal-management scale from cars to robot joints, backed by Morgan Stanley's Humanoid 100 listing.

Reducer leaders go modular

Leaderdrive (绿的谐波), China's harmonic-drive champion, now sells the KGU series integrated modules (around $900-1,250) that pair its reducers with motors and encoders. Zhongda Leader (中大力德) sells the eRob series plug-and-play joint modules (~$700-1,050) with EtherCAT/CANopen out of the box — the value-priced lane for startups that want a complete joint rather than a bare reducer. Add Inovance, Kinco and Leadshine in frameless motors, and the full actuator stack — motor, reducer, screw, bearing, driver — is now made in China end to end.

The full Chinese actuator lineup

Beyond the four anchor names above, the actuator field has deepened into a full supply chain. The table below groups the makers by what they actually ship today:

Joint-by-joint: what torque goes where

Actuator specs scale with the joint. When comparing suppliers, the relevant question is not "how big is your actuator" but "which joint is it for." Typical 2026 production ranges look like this:

The 530 N·m ceiling in hip and knee joints is the number quoted across Morgan Stanley, Goldman Sachs and Chinese broker BOM models — and it is the spec that separates a demo-stage humanoid from one that can squat, carry and walk on uneven ground. Chinese suppliers now hit that spec in production; Western suppliers still hit it but at roughly double the price.

The price moat

2026 humanoid actuator selection guides show the cost gap plainly: planetary/RV joints at RMB 4,000-8,000 domestic versus RMB 8,000-18,000 imported; linear actuators at RMB 3,500-7,000 domestic versus RMB 7,000-15,000 imported. At roughly half the price with comparable specs, Chinese actuators reset the economics of humanoids — the single biggest reason the cost curve of the whole robot is falling. That is also why Western coverage increasingly frames the actuator as China's structural moat: precision mechanical engineering, not AI, is the expensive part.

What to watch

• Tuopu's 300k-set capacity — if Q2 2026 output materializes, it becomes the benchmark for actuator scale.
• Sanhua's Optimus ramp — the $685M order's delivery schedule tracks Optimus's own production countdown.
• Integrated module pricing — sub-1,000-RMB modules will pull the whole humanoid price down another notch.

Frequently asked questions

How many actuators does a humanoid robot have?

A typical full-size humanoid carries about 30 actuators — roughly 16 rotary and 14 linear — with joint torque reaching above 530 N·m in high-power joints.

Who supplies actuators for Tesla's Optimus?

Chinese suppliers lead: Tuopu Group supplies linear and rotary actuator assemblies, and Sanhua Intelligent Controls received a reported $685M actuator order from Tesla in October 2025.

How much do Chinese humanoid actuators cost?

2026 selection guides put Chinese planetary/RV joints at RMB 4,000-8,000 versus RMB 8,000-18,000 imported, and linear actuators at RMB 3,500-7,000 versus RMB 7,000-15,000 imported — roughly half the price.

What is inside an integrated joint actuator?

An integrated joint module combines a frameless torque motor, precision reducer, encoder, torque sensor and driver in one housing — replacing the separate three-part drivetrain and cutting cost and weight.

What is an actuator in a robot?

An actuator is the joint itself — not a single part. Rotary actuators drive rotating joints through a frameless torque motor plus a harmonic or planetary reducer; linear actuators convert rotation into push-pull motion via planetary roller screws. A full-size humanoid carries about 30 actuators, and they take 40-56% of the bill of materials.

Which Chinese company is the biggest actuator supplier for humanoids?

Tuopu Group (601689) is the clearest winner: it supplies linear and rotary actuator assemblies to Tesla Optimus, AgiBot and Xiaomi, with Tesla alone accounting for 35-40% of its revenue, and its Mexico plant targets 300,000 sets by Q2 2026. Sanhua Intelligent Controls is the other anchor, with a reported $685M Optimus actuator order placed in October 2025.

What is the difference between rotary and linear actuators?

Rotary actuators drive rotating joints — shoulders, elbows, waist, hips — using a frameless torque motor plus a harmonic or planetary reducer. Linear actuators drive push-pull joints — knees, some hips, some elbows — converting motor rotation into linear force via a planetary roller screw. A typical humanoid has roughly 16 rotary and 14 linear actuators.

What is the peak torque of a humanoid hip or knee actuator?

High-power humanoid hip and knee joints now exceed 530 N·m at the output, the spec quoted across Morgan Stanley, Goldman Sachs and Chinese broker BOM models. It is the threshold that separates a demo-stage humanoid from one that can squat, carry and walk on uneven ground — and the spec Chinese suppliers now hit in production at roughly half the price of Western equivalents.

Which Chinese actuator supplier works with Tesla Optimus?

Tesla Optimus uses two Chinese anchors: Tuopu Group supplies linear and rotary actuator assemblies (Tesla is 35–40% of Tuopu's revenue), and Sanhua Intelligent Controls received a reported $685M actuator order from Tesla in October 2025. Tuopu's Mexico plant targets 300,000 sets of annual capacity by Q2 2026.