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This is a 6 piece Bulk package of the AX-18A. In this bulk pack, the servos are bare and do not come with any additional cables, brackets, or hardware. If you need this hardware, it must be purchased separately.

The AX-18A servo actuator from Robotis is the next step up from the hugly popular AX-12A Servo, offering nearly twice the speed and 15% more torque! The AX-18A robot servo retains the formfactor and all of the same features of its predecessor: the ability to track its speed, temperature, shaft position, voltage, and load. As if this weren't enough, the control algorithm used to maintain shaft position on the AX-18A actuator can be adjusted individually for each servo, allowing you to control the speed and strength of the motor's response. All of the sensor management and position control is handled by the servo's built-in microcontroller. This distributed approach leaves your main controller free to perform other functions.
CAD Files
Dimensions AX-18A Drawing
Manual AX-18 manual `
Special thanks to Humanoid Robot Lab for making
the CAD files available. All rights reserved.
AX-18A Stats
Operating Voltage 12V
Stall Torque* 18.3 kg·cm
254.9 oz·in
1.8 Newton Meter
No-load Speed 97rpm
0.103 sec/60°
Weight 54.5g
Size 32 x 50 x 40mm
Resolution 0.29°
Reduction Ratio 1/254
Operating Angle 300° or Continuous Turn
Max Current 2200 mA
Standby Current 50 mA
Operating Temp -5°C ~ 85°C
Protocol TTL Half Duplex Async Serial
Module Limit 254 valid addresses
Com Speed 7343bps ~ 1Mbps
Position Feedback Yes
Temp Feedback Yes
Load Voltage Feedback Yes
Input Voltage Feedback Yes
Compliance/PID Yes
Material Plastic Gears and Body
Motor Cored Motor
Manual Download AX-18A manual
Controller List

3-Pin TTL DYNAMIXEL Compatible Controllers

*Stall torque is the maximum instantaneous and static torque. ROBOTIS recommends that your robot or project uses 1/5 or less of the stall torque to create stable motions.


Projects Using the AX-12 Dynamixel Servos & Brackets

AX-12 Robot AX-12 Robot AX-12 Robot
AX-12 Robot AX-12 Robot AX-12 Robot
AX-12 Robot AX-12 Robot AX-12 Robot
Strength & Speed Chart of the Dynamixel Family
AX-18A Physical Dimensions
AX-18A servo dimensions