CONFAST Strike Anchors

Technical specs and installation instructions on how to install a CONFAST Strike Anchor in concrete.

CONFAST Strike Anchors
Concrete Fasteners Inc.

Strike Anchors are designed for anchoring into concrete. 

  • CONFAST Strike anchors should be used only in solid concrete and should never be installed in any other type of masonry material.
  • Never install the CONFAST Strike anchor in ACQ treated lumber.
  • Designed to be used where consistent embedment and protrusion above the surface is critical.
  • Visually inspectable due to the positive drive and positive setting of the anchor.
  • Available in six diameters of 1/4 in., 5/16 in., 3/8 in., 1/2 in., 5/8 in., 3/4 in. and a wide variety of lengths that will meet most application requirements.
  • Each box of anchors comes packaged with nuts and washers. The number of anchors in a box varies depending on the length and diameter of the anchor.
  • The length of the anchor is measured as an overall length with the body of the anchor being threaded for a portion of its length.

Technical Specifications

Before installing strike anchors, certain technical specifications must be considered to ensure the correct size and length are used. Considerations include ultimate holding values, minimum embedment, the spacing between anchors and minimum edge distance. They are available in diameters ranging from 1/4 in. to 3/4 in. and with lengths up to 6 in.. Strike anchors are made from carbon steel and plated with a yellow dichromate zinc plating. Strike anchors should be used in solid concrete only.

Length: To determine the length required, add the thickness of the material to be fastened, plus minimum embedment, plus the thickness of the nut and washer. The sum of these three items equals the minimum length.

Spacing: The forces on a strike anchor are transferred to the material in which it is installed. If the anchors are installed too close together, it can cause an interaction of the forces, thus reducing the holding power. As a rule of thumb, the expansion anchor industry has established a minimum standard of ten (10) anchor diameters for spacing between anchors and five (5) anchor diameters from an unsupported edge. When vibration or sudden impact is part of the load conditions, the spacing should be increased.

Ultimate Load Values in 2000 PSI Concrete

CONFAST Strike AnchorsConcrete Fasteners Inc.

Values shown are average ultimate values and are offered only as a guide and are not guaranteed. A safety factor of 4:1 or 25% is generally accepted as a safe working load. Reference should be made to applicable codes for the specific working ratio. 

Installation Instructions

Insert the Strike Anchor into a pre-drilled hole in the concrete. Set the anchor by striking the nail into the anchor. The nail expands the Strike Anchor in the concrete.

Installing concrete strike anchors can be completed in six easy steps. Strike anchors are designed to be used in solid concrete base material and are best suited for medium to heavy-duty fastening purposes. They are made from carbon steel and are plated with yellow dichromate. Strike anchors can be visually inspected after installation, which makes necessary inspection quick and easy. The nuts and bolts needed for installation are included and can be pre-set for the desired embedment. 

CONFAST Strike AnchorsConcrete Fasteners Inc.

  1. Drill hole using carbide bit, hole size is anchor size. Drill hole of sufficient depth. Set pin, with several sharp and square strikes on head of pin until pin is flush with top of anchor. Anchor is set with no need to torque nut to set anchor.
  2. Clean out the hole of all debris.
  3. Put the nut and washer on the strike anchor. The nut may be flush with the top of the anchor or threaded on fully.
  4. Insert the strike anchor through the fixture and into the hole with the nut/washer and set-pin in place. 
  5. Using a hammer, set the pin with several sharp and square strikes on the head of the pin until the pin is flush with the top of the strike anchor.
  6. The anchor is set with no need to torque the nut.

Holding Strengths

  • All concrete fasteners, including the CONFAST Strike anchor, derive all of their holding values from the concrete that they are installed in.
  • All holding values quoted are offered only as a guideline and are not guaranteed.
  • A rule of thumb for fastening to concrete is that the larger the diameter and the deeper the embedment then the greater the holding values that may be obtained.
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