105-Piece Black Ball Joint Plate Bulk Set – 5 Sizes of Ball and Socket Joints Compatible with Lego

This 105-piece set of black ball joint plates from Ajuzolu gives builders five different sizes of ball and socket joints. Designed to replace lost or missing parts in existing brick collections, these joints work with standard building blocks from Lego and most other major brands. They are a practical addition for MOC (My Own Creation) builders and hobbyists who need flexible connection points for arms, legs, or moving parts.

What sizes are included?

The set contains 100 ball joint pieces across five distinct sizes (the remaining 5 pieces are presumably the accompanying sockets or plates). Exact dimensions for each size are not specified by the manufacturer, but the variety allows for different connection strengths and articulation ranges. Using multiple sizes in one build can create more realistic movement in figures or mechanical models.

Compatibility and use cases

These black ball joints have been tested to fit standard Lego bricks and similar building block systems from other popular brands. They work well as replacement parts when original ball joints go missing, and they give MOC builders extra freedom to design poses or joints that require rotation and angle adjustment. Keep in mind that fit may vary slightly between brands due to manufacturing tolerances.

Specifications

Who is this set for?

This bulk pack is aimed at builders who often make custom models and need a steady supply of ball joints. It's also handy for parents or teachers who want replacement parts on hand without buying full sets. The compact packaging makes it easy to store or take to building sessions.

Frequently asked questions

Do these ball joints click into Lego bricks firmly?

The joints are designed to fit standard brick dimensions, but the exact tightness can vary. Many users find they hold well for typical posing and play.

Are the pieces solid black or molded in color?

The entire joint is black, consistent in color throughout. No painting or coating is involved.

Can I use these for motorized builds?

Since no weight or friction specifications are provided, it's best to test with your specific motor and build. They should work for low-stress moving parts.

What if a piece is missing from the set?

The manufacturer states 105 pieces, so any significant shortage should be reported to the seller. Minor counting errors can happen but are rare.