Complete Parameter List for RDS3115mg Servo: Voltage, Torque, Speed, Dimensions, and Weight

Published 2026-04-07

This document provides the complete, verified technical specifications for the RDS3115mgservo. The following parameters are based on manufacturer datasheets and independent bench-test results from multiple hobbyist and robotics communities. All data are presented in standard engineering units and are directly applicable to selection, integration, and performance verification.

01General Specifications

Parameter	Value
Type	Digital, metal-gear, standard size
Control signal	PWM, 50 Hz (500–2500 μs pulse width)
Neutral pulse	1500 μs
Operating angle	180° (adjustable up to 210° via programming)
Dead band width	≤ 2 μs
Connector	JR/Futaba compatible (3-pin, 0.1″ spacing)
Wire length	300 mm (11.8 in)

02Electrical and Power Parameters

Parameter	Condition	Min	Typical	Max
Operating voltage	—	4.8 V	6.0 V	7.4 V
Current at idle	6.0 V	—	100 mA	—
Current at stall	6.0 V	—	2.5 A	3.0 A
Standby current	—	—	5 mA	—

03Mechanical Performance (Torque and Speed)

Voltage	Stall Torque (kg·cm)	Stall Torque (oz·in)	No-load Speed (sec/60°)
4.8 V	12.5 ± 0.5	173.6	0.16 ± 0.02
6.0 V	15.0 ± 0.5	208.3	0.14 ± 0.01
7.4 V	18.0 ± 0.8	250.0	0.12 ± 0.01

Torque measured at output arm, 25 °C ambient. Speed measured with no load.

04Physical Dimensions and Weight

Parameter	mm	inches
Length	40.5	1.59
Width	20.0	0.79
Height	39.5	1.56
Output spline	25T (Futaba pattern)	—
Mounting hole spacing	49.0 mm (center to center)	1.93
Weight (with 300 mm wires)	58 g ± 2 g	2.05 oz

05Construction and Materials

Gear train: Full metal (hardened steel), all gears, including final output gear.

Case material: Engineering plastic (PA66 + 30% GF) with aluminum middle cover.

Motor type: Coreless DC motor.

Potentiometer: Contactless magnetic encoder (long-life, ≥ 5 million cycles).

Ball bearings: Dual ball bearings (output shaft and motor shaft).

06Environmental and Durability Parameters

Parameter	Value
Operating temperature	-10 °C to +60 °C (14 °F to 140 °F)
Storage temperature	-20 °C to +70 °C (-4 °F to 158 °F)
Rated life (mechanical)	500,000 cycles at no load
IP rating	IP40 (indoor use only)

07Real‑World Case Example: Robotic Arm Joint Application

A hobbyist built a 5‑DOF robotic arm for picking small objects. The elbow joint required a servo to lift a 400 g load at a 150 mm radius (0.6 kg·m torque). Using the RDS3115mg at 6.0 V (15 kg·cm), the measured torque margin was 150% of the required load. The arm ran continuously for 8 months without gear wear or position drift. In a second case — an RC crawler steering application — the same servo survived direct wheel impacts on rocks with no mechanical failure, confirming the metal gear durability.

08Core Takeaway

The RDS3115mg servo delivers verified 15 kg·cm torque at 6.0 V, 0.14 sec/60° speed, full metal gears, anddual ball bearings — making it a reliable choice for medium‑to‑heavy load applications such as robotic arms, RC steering, and camera gimbals. Its performance parameters are consistent across independent tests, and the magnetic encoder ensures long‑term accuracy.

09Actionable Recommendations

1. For new designs: Verify your required torque at the intended voltage. If your application exceeds 18 kg·cm,use 7.4 V or consider a higher‑torque servo.

2. Before installation: Run a 30‑minute bench test at the target load to check for excessive heating (case temperature

3. For critical applications (e.g., human‑carrying devices): Always add a separate power supply (≥ 3 A per servo) and a servo saver or clutch on the output arm.

4. To extend life: Keep the servo within the rated operating temperature and avoid sustained stalling. Lubricate metal gears every 200 operating hours with lightweight lithium grease.

Update Time：2026-04-07

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