Metal gear train for durability, a direct upgrade over the plastic SG90
In stock
Servos
TowerPro MG90S Metal Gear Micro Servo Motor
9g metal-gear digital micro servo, ~2.2 kg-cm torque, 180-degree, popular upgrade over plastic SG90.
₹250 + 18% GST
SKU: BOTBIT-MOT-03 · Best for: Small robotic arms and grippers needing gear durability
Overview
About TowerPro MG90S Metal Gear Micro Servo Motor.
The TowerPro MG90S is a 9-gram metal-gear micro servo that serves as the durable upgrade over the plastic-geared SG90. It fits the same tiny footprint but replaces the gear train with metal gears, so it withstands far more stress and stalling. It provides roughly 1.8-2.2 kg-cm of torque at 4.8-6V and around 180 degrees of rotation, driven by the standard 50 Hz PWM servo signal.
It is a popular choice in India for builders who like the small size of the SG90 but need the reliability of metal gears, such as in small robotic arms, camera gimbals and hexapod legs where plastic gears wear out quickly. The extra torque and rugged gearing make it a dependable step up for only a small price increase.
The MG90S uses the same mounting and connector as the SG90, so it is a drop-in replacement in most designs. It ships with servo horns and screws, ready to bolt into brackets or 3D-printed parts.
Key features
Why it stands out.
Compact 9g micro servo body with SG90-compatible mounting
Torque of approximately 1.8-2.2 kg-cm at 4.8-6V
Around 180 degrees of rotation with standard 50 Hz PWM control
Faster response than the SG90 for snappier movement
Comes with servo horns and mounting screws
Specifications
Selection facts.
| Type | Metal-gear micro servo |
|---|---|
| Weight | approx 13.4 g |
| Torque | 1.8-2.2 kg-cm at 4.8-6V |
| Operating voltage | 4.8-6V DC |
| Rotation range | approx 180 degrees |
| Control signal | 50 Hz PWM, ~1-2 ms pulse width |
| Speed | approx 0.1 s/60 degrees at 4.8V; ~0.08 s/60 at 6V |
| Gear material | Metal |
| Dimensions | approx 22.8 x 12.2 x 28.5 mm |
| Connector | 3-wire (signal, VCC, GND) |
Applications
Where it is used.
- Small robotic arms and grippers needing gear durability
- Camera and sensor gimbals in compact builds
- Hexapod and quadruped legs where micro servos are stressed
- Pan-tilt heads for lightweight cameras
- RC model control surfaces requiring metal gears
- Drop-in upgrade for SG90-based mechanisms
Buying guide
How to choose.
Choose the MG90S when you like the small SG90 form factor but want metal gears that survive higher loads and repeated stalling. It is a smart upgrade for small robotic arms, gimbals and legged robots where plastic-geared servos wear out. If loads are truly light and budget is tight, the SG90 still works.
Because it shares the SG90's mounting and connector, it drops straight into existing designs. For higher torque you would move up to a full-size MG996R, but that is much larger and heavier. Keep the load within the ~2 kg-cm rating for long life.
Drive it from any servo-PWM source such as Arduino, ESP32 or a PCA9685 driver, and power multiple servos from a dedicated 5-6V supply with a shared ground. Horns and screws are included so it installs immediately.
FAQ
Common questions.
How is the MG90S different from the SG90?
The MG90S has a metal gear train instead of plastic, giving it more durability and slightly higher torque (around 2.2 kg-cm) while keeping the same small size and mounting.
Is it a drop-in replacement for the SG90?
Yes, in most cases. It shares the SG90's mounting dimensions and 3-wire connector, so it fits the same brackets and uses the same wiring and code.
How do I control it with an Arduino?
Connect the signal wire to a PWM pin, VCC to 5V and GND to ground, then use the Arduino Servo library and call write() with an angle from 0 to 180.
How much torque does it have?
Roughly 1.8-2.2 kg-cm at 4.8-6V, higher than the plastic SG90 and enough for small arms and gimbals.
What is in the box?
One MG90S metal-gear servo with a 3-wire lead, plus servo horns and mounting screws.
Is it available in India?
Yes, the TowerPro MG90S is commonly stocked by Indian hobby-electronics retailers as the metal-gear alternative to the SG90.
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