Overview
KST A12-S is a servo motor (HV digital metal servo) designed for fast, precise actuation in robotics mechanisms and RC control surfaces. It uses a 7-phase coreless DC motor, hardened steel gears, and a contactless magnetic position sensor in an aluminum alloy case.
Key Features
- 7-phase coreless DC motor
- Hardened steel gear set
- Contactless (magnetic) position sensor
- 2BB ball bearing support
- Soft start and programmable support: Yes / Yes
- Compact and light weight design
Specifications
| Rated voltage | DC 7.4V |
| Voltage range | DC 6.0V - 8.4V |
| Torque | 1.10 N.m @ 6.0V; 1.28 N.m @ 7.4V; 1.35 N.m @ 8.4V |
| Speed (60deg rotation) | 0.11 sec @ 6.0V; 0.09 sec @ 7.4V; 0.08 sec @ 8.4V |
| Working frequency | 1520 us / 333 Hz |
| Default travel angle | +/-60 deg = 120 deg Total |
| Signal voltage | HIGH: min. 3.3V, max. 5.0V; LOW: min. 0.0V, max. 1.5V |
| Pulse lengths | 900 us - 2100 us |
| Pulse lengths for position (-50 deg / 0 deg / +50 deg) | 1000 us / 1500 us / 2000 us |
| Soft start / Programmable support | Yes / Yes |
| Motor type | 7 Phases Coreless DC Motor |
| Gear set material | Hardened Steel |
| Position sensor | Contactless (Magnetic Sensor) |
| Ball bearing | 2BB |
| Case material | Aluminum Alloy |
| Case dimensions | 30 mm x 12 mm x 35.5 mm +/- 0.2 mm |
| Weight | 32 g +/- 10% |
| Temperature range | -10 deg C ~ +60 deg C |
| Performance callout | 13.5 kgf.cm; 0.09 sec/60deg |
What's Included
- 1 x A12-S HV Metal Servo
- 2 x Plastic Servo Horn
- 4 x Mounting Screw
- 2 x Servo Horn Screw
Applications
- Humanoid robots
- Robotic arms
- Exoskeletons
- Quadruped robots
- AGV vehicles
- ARU robots
- Large scale gliders
- Open class GPS gliders
- Large aerobatic gliders
Manuals
Details
Built around a 7‑phase coreless DC motor for fast, precise actuation in compact robotics and RC installations.
Everything needed to install the servo comes in the box, including two plastic horns and mounting hardware.
