---
title: "Feetech STS3250 (12V) specs"
description: "Smart Servo actuator from Feetech (China). Peak torque 4.9 Nm, rated n/a, weight 75 g, torque density 65.8 Nm/kg, price $28."
canonical: https://actuatorlist.com/actuators/feetech-sts3250
last-updated: 2026-11-01T14:05:43.000Z
---
# STS3250 (12V, 50 kg.cm) by Feetech

> Smart Servo actuator from Feetech (China). Peak torque 4.9 Nm, rated n/a, weight 75 g, torque density 65.8 Nm/kg, price $28.

## Specifications

| Spec | Value |
| --- | --- |
| Category | Smart Servo |
| Peak torque | 4.9 Nm |
| Rated torque | n/a |
| Max speed | 75 rpm |
| Gear ratio | 345:1 |
| Weight | 75 g |
| Torque density | 65.8 Nm/kg |
| Price | $28 |
| Price per Nm | $5.7 |
| Backdrivable | n/a |
| Backlash | n/a |
| Voltage | 7.4-12.6 V |
| Peak current | n/a |
| Communication | TTL |
| Control modes | position, velocity |
| Encoder | 12-bit magnetic absolute (4096 steps) |
| Integrated driver | yes |
| Availability | in production |
| Data status | Catalog headline specs spot-checked: confirm revision |

## Size a joint

- [Motor torque calculator](/tools/motor-torque-calculator?solve=power&t=4.9&n=75): **38.5 W** of shaft power at its peak 4.9 N·m and 75 rpm.
- [Robot arm torque calculator](/tools/robot-arm-torque-calculator?L=0.4,0.35,0.12&m=1.2,0.8,0.3&a=0.0745,0.5,0&p=2): **30.3 N·m** at the shoulder with its 74.5 g at the elbow of a 2 kg-payload arm.

## Use cases

- robot arm
- quadruped leg

## Notes

Heavy-duty all-metal, coreless-motor, dual-shaft bus servo. Stall torque 50 kg.cm = 4.9 N.m and speed 0.133 s/60 deg (~75 rpm) quoted at 12V. Same TTL protocol/form factor as the STS3215; used in beefier open-source arms and legs.

## Sources

- [https://www.feetechrc.com/products/serial-port-series-steering-gear-page-3](https://www.feetechrc.com/products/serial-port-series-steering-gear-page-3)
- [https://servodatabase.com/servo/feetech/sts3250](https://servodatabase.com/servo/feetech/sts3250)
- [https://openelab.io/products/feetech-sts3250-c002-servo-12v](https://openelab.io/products/feetech-sts3250-c002-servo-12v)
- [https://shop.wowrobo.com/products/feetech-sts3250-c002-servo-12v-50kg-1-345-servo](https://shop.wowrobo.com/products/feetech-sts3250-c002-servo-12v-50kg-1-345-servo)

## Similar Smart Servo actuators

- [PH54-200-S500-R (Dynamixel-P / Pro+) (Robotis (Dynamixel))](https://actuatorlist.com/actuators/dynamixel-ph54-200-s500-r): 85.4 Nm/kg
- [XM540-W270-T (Robotis (Dynamixel))](https://actuatorlist.com/actuators/dynamixel-xm540-w270-t): 64.2 Nm/kg
- [XH540-W270-T (Robotis (Dynamixel))](https://actuatorlist.com/actuators/dynamixel-xh540-w270-t): 60 Nm/kg
- [STS3215 (12V, 30 kg.cm) (Feetech)](https://actuatorlist.com/actuators/feetech-sts3215): 53.5 Nm/kg
- [H54-200-S500-R (Dynamixel PRO) (Robotis (Dynamixel))](https://actuatorlist.com/actuators/dynamixel-h54-200-s500-r): 52.3 Nm/kg

## Machine-readable

- JSON: https://actuatorlist.com/api/v1/actuators/feetech-sts3250
- Catalog index for agents: https://actuatorlist.com/llms.txt