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Applications for the ESR-2251 Wedge Anchor

The Trubolt wedge anchor manufactured by ITW Red Head is used in uncracked, normal weight concrete in tension and shear loads.


The Trubolt wedge anchor is available in the following diameters: 1/4”, 3/8” and 1/2” and are fully threaded. They are composed of four parts: stud, expansion clip, nut, and washer. The anchor body or stud is cold-formed from carbon steel; the clip is manufactured from stainless steel. The Trubolt wedge anchor is an expansion anchor that is torque-controlled and zinc plated.The anchor body is threaded for most of its length. The end of the expansion clip attached is cone-shaped and reduced in diameter from the nominal diameter of the anchor body.

How it Works:

The Trubolt wedge anchors work by turning the nut clockwise, thus pulling the anchor body up and engaging the expansion clip against the wall of the concrete.


The Trubolt wedge anchor is designed for use in uncracked concrete, with requirements set for the concrete breakout strength, critical edge distance, pullout and shear strengths, minimum member thickness and minimum edge distance. All of the tables and mathematical equations for these requirements can be found in the report Table 2, 3 and Table 4 with the mathematical equations on page 1 and 2.


The trubolt wedge anchor must be installed in accordance with the manufacturer’s installation and the ESR-2251 report.

  1. A hole must be drilled into concrete with the compression strength of the concrete between 2,500 psi and 8,000 psi.
  2. A carbide tipped bit that meets ANSI B212.15-1994 must be used to ensure hole tolerance requirements.
  3. The diameter of the bit used should equal the diameter of the trubolt wedge anchor being installed.
  4. Hole depth must exceed the required embedment depth, as shown in Table 2 of the ESR-2251 report.
  5. The hole must be cleaned using pressurized air before trubolt wedge anchor is inserted into the hole.
  6. Turn the nut clockwise 3 to 5 times until the minimum torque values for the diameter of trubolt wedge anchor being installed is reached. The torque values can be found in Table 2 of the report.

Special Instructions- in accordance with Section 1704.13 of the IBC, special inspection is required with this anchor. The inspector must be on the job site when the trubolt wedge anchors are being installed to verify the correct diameter, length, type and strength of concrete, hole dimensions, slab thickness and torque values and spacing requirements are being met.

Conditions of Use: For a complete list see the ESR-2251 report

  1. As set forth in the ESR-2251 report, the anchor size, dimensions, and installation are followed.
  2. The trubolt wedge anchors are installed per manufacturer’s instructions in normal weight, uncracked concrete.
  3. The zinc plated carbon steel trubolt wedge anchors are limited to dry, interior applications.
  4. The compression strength of the concrete that the trubolt wedge anchor is installed in does not exceed 8,000 psi.
  5. Strength design must be in accordance with section 4.1 of the ESR report.
  6. The allowable design values must be in accordance with section 4.2 f the ESR report.
  7. Trubolt wedge anchors can be used in short-term loading applications due to the wind, subject to the conditions of the ESR-2251 report.


The anchor is identified by the diameter and length, and by the length identification letter stamped on the end of the anchor body. The length identification letter table can be found on page 3, Table 1.

To learn about more types of wedge anchors carried by Concrete Fastening Systems,

Purchase Wedge Anchors

Mar 20th 2011 Bob Carlisle

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