XQ-S4020D 6V 21 kg-cm Digital Servo | Coreless Motor | Titanium Gears
Description
Discover a powerful classic actuation solution with the SPIDER Automation XQ-S4020D 6V 21 kg-cm Digital Servo. Engineered with dual ball bearings and high-precision titanium gears, this digital servo offers exceptional mechanical strength, wear resistance, and precise control. Operating natively across a 4.8V–6.0V range (and safely handling up to 7.2V maximum), it provides a robust torque output of 21 kg-cm (spanning a practical range of 17.2 to 20.0 kg-cm). Whether you are equipping 100cc fixed-wing aircraft, gliders, helicopters, boats, or custom industrial mechatronics, the XQ-S4020D delivers the significant force and reliability required for demanding workloads.
Key Features
- Classic Coreless Motor Design: High-efficiency coreless architecture providing smooth movement, minimal electrical latency, and fast responsiveness.
- High-Precision Titanium Gears: Hardened titanium gear train offering supreme structural integrity, strip resistance, and long-term durability.
- Dual Ball Bearing Support: Minimizes friction and shaft play for ultra-smooth rotation and extended mechanical lifespan.
- Wide Voltage Compatibility: Supports standard 4.8V to 6.0V power setups, with headroom to handle up to 7.2V maximum inputs.
- Digital Precision: Advanced internal circuitry ensuring accurate positioning and reliable control under dynamic workloads.
Benefits
- Significant Force Output: Delivers high torque to handle heavy physical loads, complex control surfaces, and rigorous mechanical resistance.
- Enhanced Gear Durability: Titanium gearing withstands sudden impact shocks and high-load directional changes much better than standard brass or plastic gears.
- Reliable Operation: Consistent performance in continuous hobby and industrial operating environments.
- Versatile Application Potential: Widely trusted across large flight control surfaces, surface vehicles, and marine models.
Applications
- Fixed-Wing Aircraft & Gliders: Ideal high-torque control surface actuation for 100cc and large-scale fixed-wing models, gliders, and sailplanes.
- RC Helicopters & Boats: Heavy-duty swashplate control, rudder mechanisms, and high-load marine steering links.
- Remote-Controlled Vehicles: Steering and throttle linkages for rugged RC cars, buggies, and trucks.
- Industrial & Robotics Projects: General automation, heavy mechanical jigs, and precision mechatronic testing prototypes.
Package Includes
- 1 x XQ-S4020D – 6V21.8kg-cm Digital Servo
Specifications
| Parameter | Specification |
|---|---|
| Item Type | Digital Servo Motor |
| Brand / Series | SPIDER Automation / XQ Series |
| Model No. | XQ-S4020D |
| Motor Type | Coreless Motor |
| Casing Material | Plastics & Aluminium Combined Casing |
| Gear Train & Bearings | High-Precision Titanium Gear, Dual Ball Bearing |
| Servo Input Voltage | 4.8V – 6.0V (Supports up to 7.2V Max) |
| Torque Rating | 21.0 kg-cm (Operational range: 17.2 – 20.0 kg-cm) |
| Operating Speed | 0.13 sec / 60° |
| Physical Dimensions (L x W x H) | 40.2 mm × 20.1 mm × 38.8 mm |
| Servo Weight | 57.5 g |
| Shipping Weight | 0.065 kg |
| Shipping Dimensions | 10 × 9 × 4 cm |












