China's Planetary Roller Screw Suppliers, Ranked

If you ask a humanoid engineer what component keeps them awake at night, the answer is often the planetary roller screw. It is the precision screw that lets a robot's linear joints — hips, knees, torso — push and pull with high force in a compact package. For years, supply came from Europe. Now China is building its own base, and this is who matters.

Why roller screws are suddenly hot

• Humanoids need many linear actuators (hips, knees, ankles) for powerful, compact motion.
• Planetary roller screws beat ball screws on load capacity and life in a smaller diameter.
• China's humanoid makers are localizing the whole joint stack — and the screw is the hardest part.

The suppliers to know

• <strong>Hengli Hydraulic (恒立液压, 601100.SH):</strong> the Wuxi giant whose precision machining and heat treatment make it the most-watched entrant in humanoid roller screws and linear actuators.
• <strong>XCC Group (五洲新春, 603667.SH):</strong> the Shaoxing bearing leader transferring bearing-grade precision into planetary roller screws.
• <strong>Best Precision (贝斯特, 300580.SZ):</strong> Wuxi auto-parts maker with focused roller-screw R&D and prototype-to-production speed.
• <strong>Double-Ring (双环传动, 002470.SZ):</strong> the RV-reducer leader using its gear expertise for screws and precision transmission parts.
• <strong>Tuopu Group (拓普集团, 601689.SH):</strong> the automotive-actuator giant applying EV-grade manufacturing to humanoid components.
• <strong>Sanhua (三花智控, 002050.SZ):</strong> the components leader leveraging mechatronics for actuators and thermal management.

A quick comparison

Hengli	Wuxi	601100.SH	Industrial-scale precision, hydraulic heritage
XCC	Shaoxing	603667.SH	Bearing-grade precision
Best Precision	Wuxi	300580.SZ	Focused roller-screw R&D, fast prototypes
Double-Ring	Zhejiang	002470.SZ	RV-reducer expertise, gear mastery
Tuopu	Ningbo	601689.SH	Auto-scale actuators
Sanhua	Shaoxing	002050.SZ	Mechatronics + thermal

The takeaway for buyers: Hengli and Double-Ring are the names most likely to become the volume suppliers for humanoid linear joints, while XCC and Best Precision are strong specialist options. For investors, the roller-screw theme is one of the cleanest "picks and shovels" plays on the humanoid boom — every humanoid that ships needs these screws.