Stabilize Builds with the Technic Rotation Joint Disk

The Technic Rotation Joint Disk with Large Pin (79505) is the heavy-duty solution for creating articulated joints that can support significant weight. Unlike standard friction pins which may buckle under load, this specialized disk features a large, integrated rotation pin and robust connection points. It is the go-to element for builders designing large-scale mechs, construction equipment, or heavy walkers that require stiff, stable knees and elbows.

Essential for Walkers and Robots

This part is a staple in the Star Wars theme, specifically for the legs of heavy walkers like the AT-TE and AT-AT. Its high-friction design ensures that these massive models can hold their pose without collapsing. If you are building a custom robot or a large exosuit, this joint is critical for maintaining structural integrity while still allowing for playability.

Mating Components

To function correctly, this "male" half of the joint typically pairs with a matching socket disk. It connects seamlessly with standard beams and frames found in our Technic Pieces collection. Whether used for the boom arm of a crane or the hip joint of a titan, this part provides the mechanical strength professional builders rely on.

Discover more in our LEGO® Technic Pieces Collection.

LEGO® parts are intended for builders aged 4 and up. They may pose a choking hazard for children under 3 years old.