Springrc SR811

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Technical Specifications

Last Updated: 2026-10-25

Identity
Brand
Product Number	SR811
Category	Robotics
Performance
Torque	6.0V 458.37 oz-in 4.8V 361.14 oz-in Above Average
Speed	6.0V 0.21 sec/60° 4.8V 0.25 sec/60° Below Average
Physical
Weight	5.78 ozBottom 10%
Shape	Boxed
Dimensions	L 2.382 in W 1.209 in H 2.362 in
Drivetrain
Gears	Hybrid
Rotation Mode	Positional
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Analog
Direction	Clockwise
Rotational Range	180°
Pulse Width	500-2500 µs
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	China

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*Based on known specs.

Class Comparison

Torque	Above Average Stronger than 79% of 40 Large servos at 4.8V
Speed	Below Average Faster than 18% of 40 Large servos at 4.8V
Weight	Bottom 10% Lighter than 3% of 174 Large servos

Performance Analysis

Shaft Power	2.67–4.04 W
Power Density	0.593 W/in³ More power-dense than 34% of 97 Springrc servos
Torque Density	2.2021 oz-in/g Stronger than 73% of 41 Springrc servos
Torque-to-Volume Ratio	53.09 oz-in/in³ Denser torque than 55% of 41 Springrc servos
Speed-to-Weight	0.02439 (1/sec·g) Faster than 3% of 41 Springrc servos
Speed-Torque Trade-off	90.29 2nd-highest speed-torque trade-off of 41 Springrc servos
Torque Gain per Volt	22.44%/V 5th-highest torque gain per volt of 40 Springrc servos
Speed Gain per Volt	15.87%/V More voltage-responsive (speed) than 56% of 40 Springrc servos
Voltage Range Width	1.2 V Wider voltage range than 0% of 44 Springrc servos