Technic Ball Joint Brick 57909b 2x2 with Axle Hole

This LEGO® Technic Ball Joint Brick 2 x 2 with Axle Hole (57909b) combines a sturdy brick connection with an integrated ball joint and Technic axle hole, making it an excellent choice for articulated mechanisms. The compact design allows builders to create smooth moving joints while reinforcing assemblies with an axle for improved strength and stability.

Technic Ball Joint Brick Features

• Modified 2 x 2 Technic brick
• Integrated Technic ball joint
• Built-in axle hole for reinforced connections
• Four upper studs for standard brick building
• Compatible with matching Technic ball joint sockets
• Available in the colour variant selected on this product page

Building Applications

Part 57909b is widely used in articulated models where reliable movement and structural strength are equally important. The axle hole allows additional reinforcement through the centre of the brick, making it suitable for larger mechanisms that experience repeated movement. It works well in poseable robots, mechanical creatures, suspension systems, cranes, construction equipment and custom Technic projects.

Pair this element with compatible Technic ball joints and sockets, strengthen surrounding assemblies using LEGO Technic bricks, secure mechanisms with LEGO Technic pins and connectors, or browse our complete range of LEGO Technic pieces.