Product Overview
The FEETECH HL3925M is a high-torque TTL serial bus servo designed for robotic arms, industrial automation, research equipment, and intelligent motion control systems. Featuring a durable aluminum middle case, dual shaft structure, copper alloy gears, and 360° magnetic encoder feedback, this smart servo provides precise position control, stable communication, and reliable long-term operation.
Supporting position, speed, current, voltage, temperature, and load feedback, the HL3925M is suitable for advanced robotics applications requiring accurate closed-loop motion control.


Key Features
25KG High Torque Output
Provides up to 25kg.cm torque at 12V, suitable for robotic joints, automation mechanisms, and intelligent equipment.
360° Magnetic Encoder
Supports continuous 360° controllable rotation with 4096 resolution positioning for precise motion feedback.
Dual Shaft Structure
Dual output shaft design improves installation flexibility for robotic arms, linkage systems, and rotating mechanisms.
Aluminum Middle Case
Aluminum alloy middle shell improves structural rigidity and heat dissipation performance.
Copper Alloy Gear Set
High-precision copper gears provide improved wear resistance, smoother transmission, and longer service life.
Multi-Parameter Feedback
Real-time feedback supports:
- Position
- Speed
- Current
- Voltage
- Temperature
- Load
TTL Serial Bus Communication
Supports TTL bus communication for multi-servo networking and synchronized control applications.
Multiple Protection Functions
Built-in:
- Over-current protection
- Over-temperature protection
- Stall protection
- Voltage monitoring
Applications
- Robotic arms
- Industrial automation
- Smart manufacturing
- Educational robotics
- Aerospace projects
- Biomedical equipment
- Automated assembly systems
- Research laboratories
- AGV and mobile robots
- Intelligent motion platforms
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Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HL3925M-C001 |
| Torque | 25kg.cm @ 12V |
| Operating Voltage | 9V–12.6V |
| Typical Voltage | 12V |
| Rotation Angle | 360° (0~4095) |
| Position Resolution | 0.088° |
| Gear Type | High Precision Copper Gears |
| Gear Reduction Ratio | 1:275 |
| No-load Speed | 0.167sec/60° (60RPM @12V) |
| Encoder Type | 360° Magnetic Encoder |
| Communication | TTL Serial Bus |
| Baud Rate | 38400bps ~ 1Mbps |
| ID Range | 0–253 |
| No-load Current | 200mA |
| Stall Current | 2.7A |
| Kt Constant | 9kg.cm/A |
| Feedback Functions | Position, Speed, Voltage, Current, Temperature, Load |
| Shaft Type | Dual Shaft |
| Housing Material | Aluminum Middle Case |
Package Includes
- 1 × FEETECH HL3925M TTL Bus Servo
- Servo Horn Set
- Mounting Screws
- Connection Cable
