Technic Rotation Joint Disk 3L Liftarm (4225)

The LEGO® Technic rotation joint disk 4225 combines a pivoting disk element with a 3L thick liftarm, enabling controlled rotational movement in mechanical builds. This part integrates a large pin connection for secure attachment within Technic structures.

Mechanical Function & Design

This element is designed to create pivot points between connected components. The rotation disk allows smooth movement along a fixed axis, while the integrated liftarm provides structural support and alignment within Technic assemblies.

Applications in Technic Builds

• Rotation joint disk for controlled pivot movement
• Integrated 3L thick liftarm for structural reinforcement
• Large pin connection for stable Technic compatibility

Browse more components in the LEGO® Technic parts collection to expand your mechanical builds.