Expansion anchors are among the most popular masonry fasteners for building decoration. Different subtypes are designed for concrete, solid brick, natural stone and other base materials. Many builders feel confused when picking expansion anchors for light and medium load projects.
The core working principle relies on expansion deformation. When tightening the nut, the expansion shell opens and grips the hole wall. The substrate condition determines the anchor’s actual load capacity. Hollow or cracked masonry will greatly reduce the pull-out resistance.
Key factors for selection include load requirement, base material, installation space and anti-corrosion demand. Zinc plated anchors are common for indoor projects, while hot dip galvanized versions serve outdoor environments. Always carry out on-site pull test for important decoration projects.