Chemical Anchors

When fixing to concrete in high-load structural applications, it is suggested that you use a chemical anchor.

What Are Chemical Anchors

These types of fixers are used to secure threaded rod and rebar in high-load and critical fixings. The process involves properly cleaning the hole then applying a flexible adhesive to the fixture rather than using a mechanical anchor. The adhesive used is an epoxy, resin or polyester.

The epoxy is injected into a hole before the stud is dropped into it. Once the stud is in place, the chemical fills all gaps in the hole, ensuring that the hole is airtight. This results in an extra bond that creates additional strength for the stud to remain in place.


Our chemical adhesive anchoring systems are specifically intended to work with concrete. offers the full line of Simpson adhesives used in chemical anchoring.

The Simpson AT-XP fast-curing anchor is also intended for use with cracked and non-cracked concrete. However, it features a new technology to ensure a high strength anchor for rebar and threaded rods in concrete. It can be used in a variety of conditions and is formulated to withstand them.

Whether the ambient temperature is hot or cold, the Simpson AXP fast-curing adhesive will dispense from the tube easily.

The AT-XP materials can anchor a stud into any type of concrete, regardless of whether it is into hollow masonry or solid concrete.

When To Use Chemical Fixings

If you’re assigned to hanging a gate, fixing a letterbox, or nameplate close to the edge of a brick or stone pier, using screws and bolts won’t suffice because the fastener may expand causing the concrete or masonry to crack or split. The better alternative is to fix the components using chemical fixings and chemical resin injected into a pre-drilled hole.

A threaded stud is then screwed and bonded into the hole. A short length of thread sticks out and the ornament, gatepost, bracket or other component is then bolted to it.

Preparing For And Installing A Chemical Anchor

Materials you will need to complete the installation:

  • Studs (They are available in 8, 10, and 12 mm sizes)
  • Adhesive
  • Vacuum cleaner or air compressor
  • Wire brush
  • Drill and bit

Here is a step-by-step explanation on how to perform a chemical anchor installation.

  1. Drill the hole. Assure that the hole is drilled to the proper depth. For information on diameter and drill bit size refer to the adhesive specifications.
  2. Clean the hole.  Use a two-step method that involves blowing out the hole with a vacuum cleaner or air compressor and then cleaning it further with a wire brush to ensure that it is free of debris.
  3. Dispense the adhesive. Insert the epoxy into the proper dispensing tool and squirt out about 50- milileters of adhesive to ensure that it is mixed properly.
  4. Fill the hole from the bottom with the epoxy until it is about 2/3rds full.
  5. Slowly insert the threaded rod or rebar into the hole. Turn it as it is being inserted so that it embeds into the epoxy. This assures that the epoxy is distributed evenly around the stud.
  6. Allow the epoxy time to cure once the rod is fully inserted.
  7. Clean up excess epoxy that may have come out of the hole.

Abrafast offers a variety of anchors from chemical to mechanical and from anchor bolts and sag rods to blind bolts.