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How Does a Wedge Anchor Work?

Again, wedge type concrete fasteners are designed to use in solid concrete only. They are designed to go into a pre-drilled hole in concrete. Once installed, these wedge anchors cannot be removed without destroying the concrete. The size of the anchor is always equal to the size of the hole that needs to be drilled into the concrete. The tolerance between the hole and anchor is very tight. As the anchor is hammered into the hole, the clip is recessed in the gap of the conical space, allowing the anchor to penetrate the hole. To set the anchor, the rod must be pulled up (which occurs while the nut is being tightened), making the clip move outward on the tapered space, wedging itself between the rod and the wall of the hole.

Since the hole tolerance is critical in the performance of the wedge anchor, it is important that the correct drill and drill bits are used. A hammer drill should be used rather than a standard power drill because it creates a better quality hole. A carbide-tipped masonry bit should also be used because they are specifically designed for use in hammer drills and meet ANSI standards.

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