ABSTRACT
Torque-controlled expansion anchors, such as the one shown in Figure 1, develop their holding power by applying a specified torque to the bolt or nut. The tensioning force reacts to press out wedges into the base material. Loads later applied will not affect the anchor if they are less than the tensioning force. If the applied load does exceed the tensioning force, followup expansion occurs, further setting the anchor up to the point of failure.
