Engineered for giant-scale 3D aerobatic airframes, large turbine jets, and extreme industrial platforms, the KST X20-7512 high-voltage brushless digital servo delivers an immense 82.0 kgf.cm of stall torque and a rapid 0.11s/60° transit speed at 8.4V. Driven by a high-efficiency 4-pole brushless DC motor, hardened steel geartrain with dual ball bearings, and a rigid CNC aluminum alloy casing, the X20-7512 satisfies the most demanding competition 3D pilots with unyielding holding authority, zero backlash, and rapid-fire centering response.

Key Features

• High-Torque 4-Pole Brushless DC Motor: Advanced 4-pole architecture produces immense electromagnetic torque density, instantaneous control response, and exceptional thermal efficiency under heavy cyclic loads.
• Colossal 82.0 kgf.cm Stall Torque: Delivers massive holding power to keep giant-scale elevators, ailerons, and rudders rigidly positioned through high-speed snaps, knife-edge passes, and aggressive harrier maneuvers.
• Hardened Steel Geartrain: Precision-machined steel gears supported by dual ball bearings minimize backlash and withstand extreme aerodynamic hinge flutter and landing shock loads.
• Standard 25T-6 Output Spline: Industry-standard 25-tooth (6mm) output spline ensures broad compatibility with aftermarket aluminum servo horns.
• Full CNC Aluminum Casing: Precision-machined alloy housing guarantees structural rigidity, tight geartrain alignment, and rapid thermal dissipation during extended flights.
• High-Voltage Operation: Native 6.0V–8.4V operating range supports direct 2S LiPo receiver packs without dedicated voltage regulators.
• Programmable & Soft Start: Configurable parameters and soft-start protection (compatible with KST Tool #3 and Tool #5) to prevent sudden power-up linkage stress.

Technical Specifications

• Model: X20-7512 High-Torque Brushless Servo
• Application: Giant-Scale 3D Aerobatic Airplanes, Turbine Jets, Large Scale Models
• Rated Voltage: DC 7.4V
• Voltage Range: DC 6.0V – 8.4V (2S LiPo Direct Drive)
• Motor Type: 4-Pole Brushless DC Motor
• Gear Set Material: Hardened Steel
• Case Material: CNC Aluminum Alloy
• Bearings: Dual Ball Bearings (2BB)
• Output Spline: 25T - 6mm
• Position Sensor: High-Precision Potentiometer
• Working Frequency: 1520μs / 333Hz (1000μs – 2000μs)
• Operating Temperature: -10°C to +65°C
• Soft Start / Programmability: Yes (Programmable with KST Tool #3 & #5)
• Dimensions: 40.5 × 20.0 × 38.0 mm
• Weight: 70g (±10%)

Performance Ratings

• Stall Torque:
  • 65.0 kgf.cm @ 6.0V
  • 75.0 kgf.cm @ 7.4V
  • 82.0 kgf.cm @ 8.4V
• Operating Speed (No-Load):
  • 0.14 sec/60° @ 6.0V
  • 0.12 sec/60° @ 7.4V
  • 0.11 sec/60° @ 8.4V
• Stall Current:
  • 8.80A @ 6.0V
  • 10.80A @ 7.4V
  • 12.30A @ 8.4V

Wiring & Power Requirements

• Power Supply: High-torque operation draws up to 12.3A at stall. Please ensure your receiver power supply or battery eliminator circuit (BEC) is adequately dimensioned.
• Extension Leads: For long servo lead runs, always use high-quality twisted servo wire with a minimum conductor cross-section of 0.5mm² (approx. 20 AWG) to prevent voltage drop.
• *Always consult your model manufacturer's recommended servo specifications before installation.

Size

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