MG90S Metal Gear Mini Servo Motor 180 degree normal quality

The MG90S Metal Gear Mini Servo Motor is one of the most popular and widely-used micro servos in the maker, robotics, and RC communities. Combining a compact, lightweight design with the durability of all-metal gears, the MG90S strikes an excellent balance between size, weight, torque, and reliability — making it the perfect choice for projects where space and weight matter, but plastic-gear servos won't hold up.

The MG90S is widely regarded as the upgraded metal-gear version of the famous SG90 plastic-gear micro servo. While both servos share the same compact form factor and pinout, the MG90S offers significantly better torque, durability, and longevity thanks to its internal metal gear train and ball-bearing-supported output shaft. This makes it suitable for applications where the SG90 would quickly wear out — such as continuous use in robotic arms, frequent direction changes in RC vehicles, or moderate loads in small flying machines.

Key Performance Highlights

• Stall Torque: 2.2 kg/cm at 6V (1.8 kg/cm at 4.8V) — strong enough for most micro-scale robotics and RC tasks
• Operating Speed: 0.09 sec/60° at 6V (0.11 sec/60° at 4.8V) — fast and responsive
• Rotation Range: 180 degrees — full standard servo motion
• Dead Band Width: 10 µs — good positioning accuracy
• Operating Voltage: 4.8V – 6.0V — works directly with most RC receivers and microcontroller power rails

Ideal Mechanical Design

The MG90S features a light, high-strength nylon outer casing with a durable metal gear train and ball bearing on the output shaft. The combination of lightweight casing + heavy-duty gearing is what makes the MG90S so popular — you get strong, reliable performance without sacrificing the lightweight characteristic that makes micro servos useful in the first place.

The single ball bearing on the output shaft provides:

• Smooth, low-friction rotation
• Reduced wear on gears
• Better resistance to side loads
• Improved long-term reliability compared to bushing-only designs

Recommended Applications

The MG90S is particularly well-suited for:

• Small RC helicopters (200 to 450 class) — control surfaces and tail rotors
• Lightweight RC airplanes and gliders — ailerons, elevator, rudder
• Mini RC cars and trucks — steering and throttle control
• Robotic hands and grippers — multiple servos for finger articulation
• Small humanoid and hexapod robots — leg and arm joints
• Pan-tilt camera mounts — for FPV cameras and small webcams
• Arduino, Raspberry Pi, and ESP32 robotics projects
• Educational STEM kits and university projects
• Robotic arms — desktop manipulators with 4-6 DOF
• Animatronic projects — moving eyes, jaws, and small mechanisms
• Drones — gimbals and small servo-controlled mechanisms

Universal Compatibility

The MG90S uses the standard 3-wire servo cable with the universal RC pinout:

• Brown/Black → GND
• Red → VCC (4.8V – 6.0V)
• Orange/Yellow → Signal (PWM)

This makes it compatible with:

• All standard RC receivers (Futaba, Hitec, Spektrum, FrSky, Flysky, etc.)
• Arduino boards (using the Servo.h library)
• Raspberry Pi (with proper PWM software libraries)
• ESP32 / ESP8266 with PWM output
• STM32, Teensy, and most other microcontrollers
• Servo controller boards like the PCA9685 16-channel I2C servo driver

Included Accessories

Each MG90S typically comes with:

• Various servo horns (single, double, cross, and round-style) for different mechanical attachment needs
• Mounting screws for both the servo case and the servo horns

This means you can adapt the MG90S to many different mechanical applications without needing to source additional accessories.

Specifications

Performance

• Operating Voltage: 4.8V – 6.0V DC
• Operating Speed @ 4.8V (no load): 0.11 sec / 60°
• Operating Speed @ 6.0V (no load): 0.09 sec / 60°
• Stall Torque @ 4.8V: 1.8 kg/cm (~25 oz/in)
• Stall Torque @ 6.0V: 2.2 kg/cm (~30.5 oz/in)
• Rotation Range: 180° (standard angular servo)
• Dead Band Width: 10 µs
• Control Signal: Standard PWM (1500 µs neutral)

Mechanical

• Gear Type: All Metal Gears
• Bearing: Single Ball Bearing (output shaft)
• Casing Material: Lightweight, high-strength nylon
• Dimensions: 23 x 12.9 x 29 mm
• Weight: 14 g
• Connector: Universal 3-pin servo connector
• Wire Length: Standard servo lead (~25 cm)

Environmental

• Operating Temperature Range: -30°C to +60°C

Wiring

Applications

• Small RC helicopters (200, 250, 300, 450 class) — swashplate and tail control
• RC airplanes and gliders — ailerons, elevator, rudder, flaps
• RC cars and trucks — steering and throttle servos
• Mini RC boats — rudder control
• Robotic hands and grippers — finger and joint actuation
• Small humanoid robots — articulated joints
• Hexapod and quadruped robots — leg control
• Robotic arms — desktop manipulators with multiple DOF
• Pan-tilt camera mounts — FPV cameras, webcams, action cams
• Drones and quadcopters — gimbals and accessory servos
• Animatronic projects — moving eyes, jaws, ears, tails
• Educational STEM and robotics kits — schools and universities
• Arduino, Raspberry Pi, and ESP32 projects
• Smart home prototypes — automated locks, vents, valves
• DIY automation projects
• Maker faires, hackathons, and robotics competitions
• Theatrical and props — small mechanical effects
• Camera shutter triggers for time-lapse photography