Robbe FS 500 MG

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-07-28

Identity
Brand
Product Number	8431
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 42.50 oz-in 4.8V 34.00 oz-in Below Average
Speed	6.0V 0.17 sec/60° 4.8V 0.21 sec/60° Bottom 10%
Physical
Weight	0.74 ozAbove Average
Dimensions	L 1.18 in W 0.53 in H 1.16 in
Drivetrain
Gears	Metal
Gear Spline/Teeth	25 T estimate
Rotation/Support	Single Bearing
Control & Signal
Modulation	Digital
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal) estimate

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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.

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Below Average Stronger than 15% of 290 Digital Mini servos at 4.8V
Speed	Bottom 10% Faster than 3% of 293 Digital Mini servos at 4.8V
Weight	Above Average Lighter than 71% of 505 Digital Mini servos

Performance Analysis

Shaft Power	0.30–0.46 W
Power Density	0.637 W/in³ More power-dense than 4% of 482 Digital Mini servos
Torque Density	1.6191 oz-in/g Stronger than 20% of 286 Digital Mini servos
Torque-to-Volume Ratio	46.87 oz-in/in³ Denser torque than 18% of 288 Digital Mini servos
Speed-to-Weight	0.22676 (1/sec·g) Faster than 17% of 289 Digital Mini servos
Speed-Torque Trade-off	7.14 Better balanced than 53% of 288 Digital Mini servos
Torque Gain per Volt	20.83%/V More voltage-responsive (torque) than 76% of 257 Digital Mini servos
Speed Gain per Volt	19.60%/V More voltage-responsive (speed) than 72% of 262 Digital Mini servos
Voltage Range Width	1.2 V Wider voltage range than 29% of 405 Digital Mini servos