A wedge anchor is a type of specialty fastener used to attach objects to concrete or masonry structures. It consists of two separate pieces that are permanently pre-assembled into a single unit. The first piece is a carbon steel rod that is threaded for a portion of its length. The opposite/installed end of the anchor has a necked-down diameter, or conical space, that tapers outward back to the rod's full diameter.

The second piece of the wedge anchor is a steel slip or sleeve, that is permanently assembled around the conical section of the rod. Each wedge anchor also requires a nut and washer to complete the installation.

Wedge anchors can be used in numerous applications as long as the base material is solid concrete. Unlike many other concrete fasteners, the wedge anchor cannot be used in brick or block. Wedge anchors may also be known as anchor bolts or expansion bolts in some areas.