Looking for appropriate 1/2 diameter anchor (1/2-13) for exterior post-installed anchors for a switchboard that requires mounting hardware (as seismically tested) with a torque value of 60 ft. lbs. Fixture holes are 0.625" with a pipe spacer of 2.10 inches. Would a Hilti KB TZ2 anchor be appropriate for this?
Hi John,
Thank you for reaching out. The installation torque required for a ½” SS KB-TZ2 into concrete is 40 ft-lb. Hilti would not recommend exceeding the recommended installation torque or violating any other installation parameters specified in Table 1 of the Technical Guide, as concrete splitting and anchor failure could become concerns.
Ultimately, all design decisions (including anchor selection) are at the discretion of the Engineer of Record (EOR) on the project.
Regards,
Katelyn
Note that the KB TZ2 for the Stainless Steel 1/2" diameter anchor only has 40 ft lb installation torque but 60 ft lb required.
A similar anchor provided by Simpson - Strong Bolt 2 for their 1/2" diameter anchor has an installation torque of 65 ft lb. My question is whether the Hilti KB TZ2 1/2" diameter stainless steel anchor can work with the required 60 ft lbs torque or would it cause the anchor to fail. We had specified Hilti KB TZ2 elsewhere on this project - and this is the first instance of a condition where the Electrical enclosure seismic qualification requires a torque of 60 ft lbs for a 1/2" diameter anchor. This is for an outdoor installation of a NEMA 3 tin - aluminum enclosure.