Concrete screws are a new fastening system. During installation, concrete screws cut a thread into the wall of the drilled hole. Therefore, tensile loads are transferred into the base material by mechanical interlock. The failure load is about 20 percent lower than the concrete cone failure load of expansion or undercut anchors. Concrete screws with a Technical Approval of the DIBt can be used in cracked and non-cracked concrete. The embedment depth must be deep enough to avoid the shearing of the threads cut into the wall of the drilled hole during installation.
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