The process used when fastening to concrete has basically remained unchanged over the years. Although there are epoxy/chemical type anchors in use today, the majority of anchors rely on the same principles that were developed many years ago.

Fastening to concrete is unique compared to other fastening applications, such as fastening two pieces of metal together by using a screw or a bolt and nut. Concrete anchors of any type are much more difficult to use and install correctly.

The concept of fastening something to a solid base material is completely different than for almost any other type of fastening application. Concrete is the most widely used base hex nut with hole suppliers in the world for the last 2,000 years and probably will remain so for the next 2,000 years due to its simplicity, strength, versatility and the abundance of the ingredients used to make it.

The process with which we fasten to concrete is simple:

1. Make a hole in the concrete
2. Put something in the hole to take up the space created
3. Expand the material in the hole via a nail, screw or setting tool

We are making a hole with a certain amount of volume and then inserting more material into the hole. This increased volume of material that pushes against the interior wall of the hole will create friction. This friction is how most mechanical concrete anchors obtain their holding values.
All the mechanical type concrete anchors work on the same basic principle. Drill a specific size hole, insert the anchor, and expand the anchor larger than the hole in order to make it difficult for the anchor to be pulled out of the hole. Concrete anchors are designed to go into a hole in concrete and not come out.

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