TopServo S Series S12 S16 S35 S45 S55 8.4V Brushless Waterproof Servo 13-60kg 25T Titanium/Stainless Steel Gear
TopServo S Series S12 S16 S35 S45 S55 8.4V Brushless Waterproof Servo 13-60kg 25T Titanium/Stainless Steel Gear
TopServo
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Overview
The TopServo S Series High-Voltage Brushless Servos are designed for demanding RC applications requiring high torque, fast response, durable gears, and a waterproof aluminum housing.
The series includes five models ranging from the compact S12 and S16 short-body servos to the higher-torque S35, S45, and S55 standard-size servos. Maximum stall torque ranges from 13 kg·cm to 60 kg·cm at 8.4V, allowing users to select the ideal balance of speed, torque, size, and weight for different RC builds.
All models support 4.8–8.4V high-voltage operation, a 333Hz control frequency, 900–2100 μs pulse signal, and a 25T output spline. The aluminum housing and waterproof construction make the S Series suitable for RC cars, trucks, crawlers, boats, robots, and other high-performance radio-controlled applications.
Key Features
- High-voltage 4.8–8.4V operation
- High-performance brushless motor
- Maximum torque from 13 kg·cm to 60 kg·cm
- Speed as fast as 0.045 sec/60°
- 25T output spline
- Durable stainless steel or titanium/stainless steel gear system
- CNC-style aluminum alloy housing
- IP68 waterproof construction
- 333Hz control frequency
- 900–2100 μs pulse width
- 1500 μs neutral signal
- 120° ±10° operating angle
- Ultra-small 2 μs dead band
- JR-style 250 mm servo lead
- Suitable for JR and Futaba receiver systems
Model Comparison
| Model | Type | Weight | Size | Max Torque @ 8.4V | Speed @ 8.4V | Gear Type |
|---|---|---|---|---|---|---|
| S12 | Short Body | 53 ±2 g | 40 × 20 × 26 mm | 13 kg·cm | 0.045 sec/60° | Stainless Steel |
| S16 | Short Body | 53 ±2 g | 40 × 20 × 26 mm | 18 kg·cm | 0.058 sec/60° | Stainless Steel |
| S35 | Standard | 86 ±2 g | 40 × 20 × 39.2 mm | 40 kg·cm | 0.056 sec/60° | Titanium + Stainless Steel |
| S45 | Standard | 86 ±2 g | 40 × 20 × 39.2 mm | 50 kg·cm | 0.075 sec/60° | Titanium + Stainless Steel |
| S55 | Standard | 86 ±2 g | 40 × 20 × 39.2 mm | 60 kg·cm | 0.10 sec/60° | Titanium + Stainless Steel |
Torque & Speed Comparison
| Model | Torque @ 6.0V | Torque @ 7.4V | Torque @ 8.4V | Speed @ 6.0V | Speed @ 7.4V | Speed @ 8.4V |
|---|---|---|---|---|---|---|
| S12 | 10 kg·cm | 12 kg·cm | 13 kg·cm | 0.055 sec/60° | 0.050 sec/60° | 0.045 sec/60° |
| S16 | 14 kg·cm | 16 kg·cm | 18 kg·cm | 0.070 sec/60° | 0.060 sec/60° | 0.058 sec/60° |
| S35 | 25 kg·cm | 35 kg·cm | 40 kg·cm | 0.080 sec/60° | 0.060 sec/60° | 0.056 sec/60° |
| S45 | 35 kg·cm | 45 kg·cm | 50 kg·cm | 0.11 sec/60° | 0.09 sec/60° | 0.075 sec/60° |
| S55 | 43 kg·cm | 55 kg·cm | 60 kg·cm | 0.14 sec/60° | 0.12 sec/60° | 0.10 sec/60° |
S12 Short-Body Servo Specifications
The TopServo S12 is the fastest model in the series and uses a compact 26 mm short-body design. It is ideal for applications where installation space and fast response are more important than extremely high torque.
| Specification | S12 |
|---|---|
| Weight | 53 ±2 g |
| Dimensions | 40 × 20 × 26 mm |
| Stall Torque @ 6.0V | 10 kg·cm |
| Stall Torque @ 7.4V | 12 kg·cm |
| Stall Torque @ 8.4V | 13 kg·cm |
| Speed @ 6.0V | 0.055 sec/60° |
| Speed @ 7.4V | 0.050 sec/60° |
| Speed @ 8.4V | 0.045 sec/60° |
| Gear | Stainless Steel |
| Output Shaft | Ø5.9 mm 25T |
S16 Short-Body Servo Specifications
The TopServo S16 combines the same compact short-body dimensions as the S12 with increased torque of up to 18 kg·cm at 8.4V.
| Specification | S16 |
|---|---|
| Weight | 53 ±2 g |
| Dimensions | 40 × 20 × 26 mm |
| Stall Torque @ 6.0V | 14 kg·cm |
| Stall Torque @ 7.4V | 16 kg·cm |
| Stall Torque @ 8.4V | 18 kg·cm |
| Speed @ 6.0V | 0.070 sec/60° |
| Speed @ 7.4V | 0.060 sec/60° |
| Speed @ 8.4V | 0.058 sec/60° |
| Gear | Stainless Steel |
| Output Shaft | Ø5.9 mm 25T |
S35 Standard Servo Specifications
The TopServo S35 offers a strong combination of high torque and very fast response. At 8.4V, it provides 40 kg·cm torque with a speed of 0.056 sec/60°.
| Specification | S35 |
|---|---|
| Weight | 86 ±2 g |
| Dimensions | 40 × 20 × 39.2 mm |
| Stall Torque @ 6.0V | 25 kg·cm |
| Stall Torque @ 7.4V | 35 kg·cm |
| Stall Torque @ 8.4V | 40 kg·cm |
| Speed @ 6.0V | 0.080 sec/60° |
| Speed @ 7.4V | 0.060 sec/60° |
| Speed @ 8.4V | 0.056 sec/60° |
| Gear | Titanium Alloy + Stainless Steel |
| Output Shaft | Ø5.9 mm 25T |
S45 Standard Servo Specifications
The TopServo S45 increases maximum stall torque to 50 kg·cm at 8.4V, making it suitable for larger or heavier RC steering and control systems.
| Specification | S45 |
|---|---|
| Weight | 86 ±2 g |
| Dimensions | 40 × 20 × 39.2 mm |
| Stall Torque @ 6.0V | 35 kg·cm |
| Stall Torque @ 7.4V | 45 kg·cm |
| Stall Torque @ 8.4V | 50 kg·cm |
| Speed @ 6.0V | 0.11 sec/60° |
| Speed @ 7.4V | 0.09 sec/60° |
| Speed @ 8.4V | 0.075 sec/60° |
| Gear | Titanium Alloy + Stainless Steel |
| Output Shaft | Ø5.9 mm 25T |
S55 Standard Servo Specifications
The TopServo S55 is the highest-torque model in the S Series, delivering up to 60 kg·cm at 8.4V for demanding high-load RC applications.
| Specification | S55 |
|---|---|
| Weight | 86 ±2 g |
| Dimensions | 40 × 20 × 39.2 mm |
| Stall Torque @ 6.0V | 43 kg·cm |
| Stall Torque @ 7.4V | 55 kg·cm |
| Stall Torque @ 8.4V | 60 kg·cm |
| Speed @ 6.0V | 0.14 sec/60° |
| Speed @ 7.4V | 0.12 sec/60° |
| Speed @ 8.4V | 0.10 sec/60° |
| Gear | Titanium Alloy + Stainless Steel |
| Output Shaft | Ø5.9 mm 25T |
Common Specifications
| Specification | Details |
|---|---|
| Operating Voltage | 4.8–8.4V |
| Motor Type | Brushless Motor |
| Pulse Width | 900–2100 μs |
| Neutral Position | 1500 μs |
| Signal Frequency | 333Hz |
| Operating Angle | 120° ±10° |
| Dead Band | 2 μs |
| Operating Temperature | -10°C to 50°C |
| Housing | Aluminum Alloy |
| Waterproof Rating | IP68 |
| Servo Cable | 250 mm |
| Connector | JR Type |
| Receiver Compatibility | JR / Futaba |
| Standby Current | 20 mA |
| No-Load Current | 200 mA Max |
| Stall Current | 4000 mA Max |
Gear Configuration
The models use different gear configurations based on their intended torque range:
- S12 / S16: Stainless steel gears with Ø5.9 mm 25T output shaft
- S35 / S45 / S55: Titanium alloy + stainless steel gear train with Ø5.9 mm 25T output shaft
This metal gear construction provides increased strength and durability for high-load steering and control applications.
Applications
The TopServo S Series can be used in a wide range of RC and robotic applications, including:
- 1/10 and 1/8 RC cars
- RC trucks
- RC crawlers
- Off-road RC vehicles
- RC boats
- Robotics
- Mechanical control systems
- DIY RC projects
The S12 and S16 are especially suitable where a shorter servo body is required, while the S35, S45, and S55 provide progressively higher torque for heavier-duty installations.
What’s Included
- 1 × TopServo S Series Brushless Servo
