Servo Specs, Reviews, & Comparison Tool
Blue Arrow S0251 - Ultra-Micro Servo with White Micro JST Connector
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | (add) |
| Torque: |
4.8V: 2.78 oz-in (0.20 kg-cm) 6.0V: 4.86 oz-in (0.35 kg-cm) |
| Speed: |
4.8V: 0.09 sec/60° 6.0V: 0.07 sec/60° |
| Weight: | 0.11 oz (3.1 g) |
| Dimensions: |
Length:0.77 in (19.6 mm) Width:0.32 in (8.1 mm) Height:0.86 in (21.8 mm) |
| Motor Type: | (add) |
| Gear Type: | Plastic |
| Rotation/Support: | Bushing |
| Rotational Range: | 60° |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | JST |
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Notes
- The discontinued Blue Arrow S0251 is a legendary servo in the RC community, a true classic in the pico-class that has served as the foundation for countless indoor and micro-flying projects of less than 4 ounces total. Weighing in at a mere 2.5 grams, its introduction was revolutionary, enabling a new generation of incredibly lightweight aircraft. As an analog servo, its operation is straightforward and dependable, providing reliable control for the smallest of models. It has become a staple component for scratch-builders and hobbyists who delight in creating minimalist marvels from foam, balsa, and carbon fiber. It is the quintessential choice for small indoor "living room flyers," park-flyer-class aircraft, and the ailerons on smaller hand-launch gliders where every fraction of a gram saved contributes to better performance.
- The enduring value of the S0251 lies in its perfect storm of simplicity, reliability, low weight, and affordability. It is the workhorse of the micro servo world, a component that has proven its worth over many years and through millions of flight hours logged by hobbyists around the globe. While it may not have the bells and whistles of modern digital servos, it offers predictable, smooth performance that is more than adequate for a huge range of lightweight aircraft. It's often the first servo a new builder will work with and a trusted favorite for seasoned veterans.
- For robotics enthusiasts and students, the S0251 is an excellent and accessible entry point into the world of micro-robotics. Its low cost and simple operation make it ideal for experimentation. It is perfect for actuating tiny parts, creating the mechanisms for miniature walking robots, building lightweight sensor-panning setups, or for any project where the primary design constraints are minimal size and weight, and where digital precision is not a strict requirement. It is a fundamental building block for small-scale mechatronics.
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