AR4-MK5

The robot
anyone can build.

Open-source 6-axis arm for a desk. Machine the aluminum or print the parts, then program it in Python or ROS. Built for schools, shops, and makers who want industrial motion without the industrial price.

ROS 2StepperOnline
Click to jogClick to teach
AR4 robot arm base and shoulder joint
Annin Robotics AR4 6-axis robot armAR4 robot arm forearm and wrist
Axes
6 DOF
Reach
24.75 in
Payload
4.15 lb
Repeatability
0.25 mm
Mass
27 lb
Power
198 W

Who it's for

AR4 6-axis robot arm

For industry

AR4 for Industry

Deploy the AR4 for light assembly, prototyping, or production tasks. Its Arduino/Python control and Modbus support bridge DIY projects and professional automation.

Students building with an AR4 in class

For education

AR4 for Education

From STEM classrooms to university labs, the AR4 teaches real-world automation with accessible Python programming and 3D-printable customization.

Control options

Multiple Ways to Control the AR4

Choose the workflow that fits your application, from a visual interface to ROS2 and a full Python API.

Annin Robotics

Graphic User Interface

Direct manual control, teach points, jogging, and program editing.

Python

Python API

Programmatically connect, move, and automate with a full API.

Also supports

Applications

Application Examples

AR4 pick and place cell
Pick and place01 / 13

Videos

Highlighted Videos

Robot kits

Build your own AR4

Everything you need to assemble a 6 axis robot arm on your bench, with a manual and videos for every step.

AssemblyEasy to assemble
AR4 robot kit parts laid outAR4 kit parts
  • Easy to assembleFree build manual and step by step video tutorials.
  • Complete AR4 kitMachined aluminum, bearings, belts, and hardware.
  • Motors and electronicsStepper motors, drivers, and wiring for smooth motion.

In the wild

User builds

Real projects from workshops, labs, and makers.

View builds

The film

The AR4 in motion

Ready to build

The kit. Free manuals. Open software.

Start with the combo kit, add motors and a gripper, print the covers, or buy a finished set. Everything you need to assemble and run the AR4 is documented.

AR4 robot ready to build