An anchor nut, sometimes called a plate nut, is a self-locking, self-wrenching fastener. It provides a permanent nut element in a material so that other materials can be attached to it using a screw. In fact, it is a reliable way of making sure nuts and screws (for additional components) are placed exactly where they should be onto a workpiece. 

It’s particularly used for space constrained areas, ones that are difficult to access, or spots that are not thick enough, commonly known as inaccessible or blind locations. Basically, areas where threads would be too big. A plate nut is also recommended in areas where welding is not advisable. The heat coming from the welding process can weaken a surface, which may cause deformities and breakage later on. However, for stress purposes, a plate nut may be welded in place. This is because drill holes will be minimized. An anchor nut is ideal for stressed-skin applications because using these fasteners do not require additional stresses around the bolt hole.

Anchor nuts come in different styles. There are those with lugs and those without. This plate nut doesn’t come with lugs. Instead, it’s designed to be built right into the workpiece. It will be secured using rivets.