Three-piece Built-in Expansion Bolts for Hollow/Porous/Foam Brick

Designed for secure fastening in special building materials like hollow brick, porous brick, and foam brick, our Three-piece expansion bolts deliver reliable performance with their robust construction.

Crafted from carbon steel material screws and available with plain finish expansion bolts or zinc plated finish screws for corrosion resistance, these built-in expansion screws ensure durability in various building application screws scenarios—such as wall-mounted fixtures, brackets, or light structural supports.