Hex Head Removable-Bolt Anchors for Block and Brick. A hex head allows for a secure grip with a wrench. Also known as sleeve anchors, these have a sleeve that expands for a secure hold in block and brick. They're often used to hold steel and wood panels, doors, framing, and shelving. To install, tap the anchor into a hole and tighten the bolt to expand the sleeve. As you tighten, the nylon ring compresses to secure the fixture against the base material. Made from 18-8 stainless steel, they're chemical resistant and may be mildly magnetic. Pull-out strength and shear strength values are 25% of the ultimate values.For elevator decoration industry, The external hexagonal internal expansion screw is a common expansion screw. The installation principle is to compress the expansion screw through the threaded screw so that it can pass through the pre-drilled hole and enter the interior of the substrate. When the threaded screw is tightened, the head of the screw and the tail of the expansion nut are squeezed together to generate pressure, so that the tail of the expansion screw expands to form a firm connection. Because the expansion process is uniform, damage to the material can be avoided, and it has good reliability and durability. In practical applications, hexagonal inner expansion screws are usually used for medium and heavy components fixed and connected in steel structures, bridges, road guardrails, mechanical equipment, and buildings.
