Substitution Letter for KB-TZ to KB-TZ2

Hilti Inc.
7250 Dallas Parkway, Suite 1000
Plano, TX 75024
1-800-879-8000
www.hilti.com
November 1, 2021
RE: Hilti KB-TZ2 to replace Hilti KB-TZ
To Whom It May Concern:
For over 10 years, Hilti has been providing the Kwik Bolt TZ (KB-TZ) carbon and stainless-steel anchors in
cracked and uncracked concrete and grout-filled CMU for various anchoring applications in the construction
industry. Although KB-TZ is already an outstanding expansion anchor solution in the market, Hilti wants to take
the expansion anchor further to provide an even more optimized fastening solution.
In 2021, we are happy to announce Hilti is introducing the Kwik Bolt TZ2 (KB-TZ2) as a replacement to the KB-
TZ. Similar to the KB-TZ, the KB-TZ2 anchor is a torque-controlled, mechanical expansion anchor consisting of a
stud, wedge, washer and nut. When compared to KB-TZ, the KB-TZ2 will offer a wider portfolio of diameters and
lengths.
The KB-TZ2 can be used in the following base materials:
• Cracked and uncracked normal-weight concrete to lightweight concrete (specified compressive strength,
f′
c
, of 2,500 psi to 8,500 psi)
• Lightweight concrete over metal deck (3,000 psi minimum specified compressive strength)
• Uncracked, fully grouted concrete masonry unit (CMU) construction
As with the KB-TZ, Hilti has thoroughly tested the KB-TZ2 in accordance with the following:
• ICC-ES Acceptance Criteria for Mechanical Anchors in Concrete Elements (AC193) which incorporates
requirements in ACI 355.2-07
• ICC-ES Acceptance Criteria for Expansion Anchors in Masonry Elements (AC01)
• FM 1951 and UL 203 for use with fire sprinkler pipes
Based on this testing, ICC-ES recently released the Evaluation Report ESR-4266 (Concrete) and ESR-4561
(Masonry). The KB-TZ2 is an ultimate performance anchor and in most cases has the best performance in the
industry. The KB-TZ2 is equal to or better than the KB-TZ with limited exceptions.
The full ICC ES reports for KB-TZ2 are available for download at www.hilti.com or www.icc.es.org
. It is highly
recommended to use PROFIS Engineering to redesign your existing projects with the new KB-TZ2.
Please feel free to contact our Engineering Technical Services department for more information or any questions.
Hilti Engineering Technical Services – United States
[phone] toll free
[e-mail]
Hilti Engineering Technical Services – Canada
[phone] toll free
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