Wedge Anchors are mechanical anchors for fastening items to concrete. They have a loose metal clip around one end of the fastener that slides down the wedge shaped end when the nut is tightened on the threaded end until it can no longer move. When the collar can no longer move, the anchor is locked into the concrete and so is the item being fastened with the anchor. Wedge anchors are installed in holes the same diameter as the anchors themselves, so a 1/2″ anchor requires a 1/2″ hole in the concrete it’s being placed in.
Wedge anchors must be placed into holes that allow them to meet the minimum embedment figures on their chart. The chart should be easily located in every box to prevent errors. Because they rely on a certain amount of concrete to engage and hold the anchor, following the chart is critical or failure could occur. Note, the anchor may engage and hold in less than it’s required minimum but the pull out value will not be the same as a correctly installed anchor