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Concrete Stud Anchors

Wednesday, February 2, 2011
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Purchase Wedge Anchors

Types of Concrete Stud Anchors

Concrete stud anchors are manufactured out of a number of different types of materials or coatings that are used in different types of applications.

  • Zinc Plated - the zinc plated concrete stud anchors are manufactured from carbon steel and the zinc plated and is for dry indoor applications where moisture is not present.
  • Hot-Dipped Galvanized - concrete stud anchors manufactured from carbon steel and then hot-dipped galvanized for use in outdoor applications where moisture is present.
  • 303-304 stainless steel - concrete stud anchors manufactured from these two types of stainless steel are for use in wet environments and may be submerged in water.
  • 316 stainless steel - for use in caustic-type environments where chemicals such as chlorine are present or submerged in salt water.

Available Sizes

The concrete stud anchor dimensions are described as the diameter of the concrete stud anchor as well as the length of the concrete stud anchor. The available sizes are shown with the diameter first and then the time's sign (X) and then the length for example 3/8" x 5" would describe a concrete stud anchor that is 3/8" in diameter and 5" long.

Diameter - the diameter of the concrete stud anchor refers to the tread end and the diameter of the nut that can be threaded onto it.

Length - the length of the concrete stud anchor is measured as an overall length from one end to the other, including the threads and the clipped area of the stud.

Diameter to Use

The diameter of concrete stud anchor to use in any particular application is dependent on many factors, such as the weight of an object being fastened, depth of embedment, the strength of the concrete, the diameter of the hole in the item being fastened whether or not the diameter has been specified by an engineer. The larger in diameter the concrete stud anchor is the more weight it is able to hold and the deeper the embedment the better the holding value may be attainable.

The higher the strength of concrete that the concrete stud anchor is placed within, the higher the potential holding values will be. The predrilled hole in the fixture may also be a determining factor if the hole in the fixture is a certain size than the diameter of wedge anchor that can be used is limited to the size of concrete stud anchor that will fit through the hole. An engineer for the company of the item being attached determines many types the diameter of concrete stud anchor.

Length to Use

The minimum length of concrete stud anchor to use is determined by adding the thickness of the material being fastened to the minimum embedment for the diameter of concrete stud anchor, plus space for the nut and washer. Each diameter of concrete stud anchor must be installed into the concrete at a minimum depth of embedment.

Diameter of Hole

The diameter of the hole that must be drilled into the concrete must be equal to the diameter of concrete stud anchor being installed,  5/8" concrete stud anchor requires a 5/8" hole.

Depth of Hole

The hole must be drilled a minimum of 1/2" deeper into the concrete then the concrete stud anchor will penetrate. This will ensure that the concrete stud anchor will not bottom out in the hole and will allow space for any dust that is created during the installation process to fall into making sure it does not affect the installation of the concrete stud anchor.

Concrete Stud Anchor Installation

Watch a wedge anchor installation video here or follow the steps below to install a concrete wedge anchor.

  1. With a hammer drill in the hammer mode and a carbide tipped drill bit that meets ANSI standard B212.15 that is the same diameter as the diameter of the concrete wedge anchor being installed drill a hole in the concrete.
  2. Drill the depth of the hole a minimum of 1/2” deeper than concrete wedge anchor will penetrate or 1/2” deeper than the minimum depth of embedment.
  3. Using a wire brush, compressed air or vacuum clean out the hole of all debris and dust.
  4. Thread the nut onto the threaded end of concrete wedge anchor, so that the top of the nut is flush with the top of the concrete wedge anchor, this will protect the threads from damage during installation.
  5. Insert concrete wedge anchor, clipped end first, into the predrilled hole in the concrete. If the concrete wedge anchor is being installed through a hole in a fixture make sure that the hole diameter is larger than the diameter of the concrete wedge anchor being used.
  6. With a hammer strike, the nutted end of the concrete wedge anchor until a minimum of 6 threads are below the surface of the concrete or the surface of the item being attached.
  7. Using your fingers, tighten the nut.

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Always use personal protective equipmentAs with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.

Article Written By:
Mike Pistorino, Vice-President Operations





Concrete Fastening Systems, Inc. has over 40 years of experience selling concrete fasteners. We can ship out one box or a whole pallet of concrete anchors. Our products are of the highest quality... "your satisfaction is guaranteed". We ship all orders the same day the order is received.

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