GALVANIZED THREADED ROD

Question

Posted by sadra mahmoodiabout 4 years ago

We are utilizing ASTM F1554 grade 36 threaded rods with Hilti's HIT-HY 270 adhesive in grouted masonry CMU walls. Would hot-dip galvanizing the threaded rods have any effective on the capacity of the anchor adhesive?

epoxy bond,galvanized steel anchor

1 Reply

Posted by Emily about 4 years ago

Hilti Verified

Hi Sadra,

HIT-HY 270 only has testing with threaded steel rods that conform to the requirements of Section 3.2.3 of ESR-4143. For all other rods, we do not have any testing and the engineer on the project should consider engineering judgment and on-site evaluation to determine suitability for the application.

See snippet attached.

Best,
Emily

3.2.3.png118.94 KB

2 comments on this reply

Posted by Emily about 4 years ago

Hi Sadra, The only hot-dipped galvanized anchor element HIT-HY 270 has testing with is with the HIS-N internally threaded insert. This is different than threaded steel rods. Section 3.2.7 states that a hot-dipped galvanized coating on a HIS-N insert is permitted. Section 5.14 does not specify threaded rod specifically, and instead mentions “steel anchoring materials”. Hope this helps. Best, Emily

Posted by sadra mahmoodiabout 4 years ago

I believe further clarification by Hilti is required. Section 5.14 of ESR-4143 states "Steel anchoring materials in contact with preservative-treated wood or fire-retardant-treated wood must be stainless steel or hot-dipped galvanized in accordance with ASTM A153 Class C or D." This statement implies that either stainless steel or hot-dipped galvanized anchors can be used. There is also a substitution letter dated January 15, 2018 from Hilti's website stating that "The new Hilti HIT-HY 270 Adhesive Anchoring System is now available as a direct replacement for Hilti HIT-HY 70 Adhesive Anchoring System in masonry applications." The previous Hilti technical document for the HIT-HY 70 adhesive indicates that all material finishes for threaded rods can be used with the adhesive: plain, zinc-coated, galvanized, and stainless steel. Please advise as on-site evaluation is not feasible for this project.