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Technical Specifications
Last Updated: 2026-10-08| Identity | |
| Brand |  |
| Category | Hobby |
| Performance | |
| Torque |
6.0V
138.80 oz-in
9.99 kg-cm
1.0 N-m
4.8V
111.10 oz-in
8.00 kg-cm
0.8 N-m
Below Average
|
| Speed |
6.0V
0.07 sec/60°
857.1 deg/s
142.9 RPM
4.8V
0.09 sec/60°
666.7 deg/s
111.1 RPM
Above Average
|
| Physical | |
| Weight | 1.85 oz52.4 gAbove Average |
| Dimensions |
L 1.59 in W 0.79 in H 1.46 in L 40.4 mm W 20.1 mm H 37.1 mm |
| Case Material | Aluminum |
| Drivetrain | |
| Motor Type | Coreless |
| Gears | Titanium |
| Gear Spline/Teeth | 25 T |
| Rotation/Support | Dual Bearings |
| Control & Signal | |
| Modulation | Digital |
| Control System | PWM |
| Electrical & Environment | |
| Operating Voltage | 4.8–6 V |
| Temperature | -10–50 °C14–122 °F |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | 250 mm9.84 in |
| Origin | |
| Country of Origin | Taiwan |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Torque | Below Average Stronger than 21% of 1055 Digital Standard servos at 4.8V |
| Speed | Above Average Faster than 85% of 1038 Digital Standard servos at 4.8V |
| Weight | Above Average Lighter than 83% of 1872 Digital Standard servos |
Performance Analysis
| Shaft Power | 3.67 W |
| Power Density | 1.999 W/in³ More power-dense than 44% of 1762 Digital Standard servos |
| Torque Density | 2.1202 oz-in/g Stronger than 24% of 1048 Digital Standard servos |
| Torque-to-Volume Ratio | 60.58 oz-in/in³ Denser torque than 20% of 1053 Digital Standard servos |
| Speed-to-Weight | 0.21204 (1/sec·g) Faster than 89% of 1031 Digital Standard servos |
| Speed-Torque Trade-off | 10.00 Better balanced than 13% of 1029 Digital Standard servos |
| Torque Gain per Volt | 20.78%/V More voltage-responsive (torque) than 80% of 868 Digital Standard servos |
| Speed Gain per Volt | 23.80%/V More voltage-responsive (speed) than 91% of 868 Digital Standard servos |
| Voltage Range Width | 1.2 V Wider voltage range than 20% of 1552 Digital Standard servos |
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Reviews (4)
Includes 2 reviews aggregated from around the web.
There are few reviews for this servo on the web. A Reddit owner says it works as advertised and is very fast, and commenters add that fast servos are addictive and that the 1257 is their preferred servo.
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Frank
December 13, 2023Application(s): Swash servos, T Rex 550. Beast X. (1257 TG Titanium gears.)
Comments: Sport flying, loops and rolls ect. Just completed 5 seasons with no problems. One gear replaced after crash. Use them on my Rex 600 also. Excellent servo and good value.
mini
January 31, 2013Application(s): Drift RC car steering
Comments: Nothing compares to it for touring or drift car steering servo use. Great performance, durability and bang-for-buck. You'll be getting in my opinion more than what you pay for