1/2" and 5/8" dia. Kwik Bolt TZ2 SS316 anchors were specified for securing equipment to the top of a concrete slab for seismic resistance for a wastewater treatment plant in North Carolina (Building Category III w/ SDC C). The contractor used, HST2-R anchors that came with the equipment by accident. The HST2-R anchors have an equal or greater embedment depth than the specified Kwik Bolt TZ2 anchors and edge distances are met. Profis does have HST2, HST3, and HST3-R options, but not HST2-R. However, thus far it appears, HST2 anchors are meeting the demands per the program and thus far in the comparison review, the HST2/3 ETA report appears to be closely similar to the KBTZ2 ICC. Would Hilti be able to offer their manufacturer's knowledge and any additional information on this?
Thanks for your question, from an application point of view the KBTZ2 ss316 and the HST2-R A4 are both mechanical stud / wedge anchors that are similar however, the technical data and approvals are different.
The technical data given in the European Technical Assessment (ETA) are based on tests and evaluation according to European guidelines (Eurocode 2 Part 4 ), while the technical data in the ICC-ESR are based on tests and
evaluation according to US regulations, even so both EU and US regulations can be similar for anchor approvals they
are not the same. For example the HST2-R has no approval for fixing into metal composite decks or masonry structures whist the KB-TZ2 does.
Please be also aware, that the technical data for HST2-R given in the ETA is only valid, if the requirements and conditions given in the ETA are fulfilled, e.g. drilling diameter (do not use inch size drill bits for metric size anchors, if not
stated so in the approval).
It is important to also be aware, that the HST2-R has no US approval (ICC-ESR). If an ICC-ESR and or Nuclear (NQA-1) is a requirement in the specification, then the HST2-R must not be used..