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We have a ton of free resources to help you build the AR4 robot?
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HTD Series Belt Update for Joint 3

$32.50

View the Robot Build Manual
Your complete offline reference. Includes full assembly instructions, wiring diagrams, and technical specs. Always up to date, perfect for printing or workshop use.
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This includes the long and short HTD-20 pulleys and HTD 550-5M belt for the AR4 robot. These parts come with the robot combo kit and hardware kit.

This update is only needed if you have previously built the AR4 robot and would like to upgrade your belt and pulleys.
AR4 Robot Build Resources
Master your AR4 robot from build to advanced programming. Our ecosystem provides step-by-step guidance with the Build Manual, continuous learning through Tutorials & Courses, instant answers in the Knowledge Base, and direct support from our Community and Legacy Forums.
Additional Products

AR4 MK3 Robot Combo Kit

$1,329.00

Complete AR4 MK3 stepper-motor, driver & power supply package – factory direct from Stepperonline

AR4 MK3 Aluminum Parts Kit

$820.00

AR4 MK3 Hardware Kit

$429.00

AR4 MK3 Electrical Parts Kit

$230.00

Pneumatic Gripper Parts Kit

$152.50

Servo Gripper Parts kit

$84.50

AR4 Modbus PLC upgrade option

$16.00

AR4 MK3 CAD Models – SOLIDWORKS & .STEP files

$99.00

HTD Series Belt Update for Joint 3

$32.50

J6 Housing and Gripper Mount – for upgrading to MK3 from previous versions

$38.50

AR4 Robot Clear Arm Covers

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