Delivering an astonishing 42.0 kgf.cm of stall torque in a compact 25.5mm low-profile casing, the KST SV4012-12 redefines torque density for competitive RC racing cars, large-scale fixed-wing aircraft, and high-load robotics. Powered by an advanced 4-pole brushless DC motor, native 3S LiPo / 12V direct drive capability, hardened steel gears, and an expansive 200° total default travel angle, the SV4012-12 unleashes brutal holding power and a blisteringly fast 0.10s/60° response without requiring heavy external voltage regulators.

Key Features

• High-Torque 4-Pole Brushless Motor: Advanced 4-pole rotor architecture delivers significantly higher electromagnetic torque density, cooler continuous operation, and ultra-smooth linear response under extreme steering and aerodynamic loads.
• Colossal 42.0 kgf.cm Torque in Low-Profile Form: At just 25.5mm in height and 50g, it easily installs into low-clearance 1/10 and 1/8 RC car chassis, thin wing bays, and compact robotic joints while delivering standard-size powerhouse torque.
• Super High-Voltage (SHV) Direct Drive: Native 8.4V–13.0V operating range allows direct connection to 3S LiPo batteries — eliminating bulky BEC voltage regulators, minimizing weight, and simplifying airframe and chassis wiring.
• Expansive 200° Default Travel: Wide ±100° (200° total) factory travel angle provides exceptional throw for crawlers, robotic articulation, and high-deflection aerobatic control surfaces (programmable endpoints).
• Hardened Steel Geartrain: Dual ball-bearing supported metal drive train withstands repeated curb collisions, rough track landings, and heavy hinge flutter without developing gear slop.
• Full CNC Aluminum Casing: Precision-machined aerospace alloy housing delivers maximum torsional rigidity, precise chassis fitment, and rapid heat dissipation during extended endurance racing.
• Programmable & Soft Start: Customize travel limits, direction, and soft-start ramp profiles to safeguard linkages and drivetrains on power-up.

Technical Specifications

• Model: SV4012-12 SHV Low Profile Brushless Servo
• Rated Voltage: DC 12.0V
• Voltage Range: DC 8.4V – 13.0V (2S–3S 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)
• Position Sensor: Potentiometer
• Working Frequency: 1520μs / 333Hz
• Default Travel Angle: ±100° (200° Total, Programmable)
• Operating Temperature: -20°C to +65°C
• Soft Start / Programmability: Yes (Programmable)
• Dimensions: 40.5 × 20.0 × 25.5 mm (±0.2mm)
• Weight: 50g (±10%)

Performance Ratings

• Stall Torque:
  • 35.0 kgf.cm @ 8.4V
  • 40.0 kgf.cm @ 12.0V
  • 42.0 kgf.cm @ 13.0V
• Operating Speed (No-Load):
  • 0.16 sec/60° @ 8.4V
  • 0.12 sec/60° @ 12.0V
  • 0.10 sec/60° @ 13.0V
• Start Current:
  • 2.79A @ 8.4V
  • 3.65A @ 12.0V
  • 4.05A @ 13.0V

Dimensions & Sizing

Documentation

• Download SV4012-12 Technical Specification Sheet (PDF)