Use ETA-Approved cordless impact wrench to setup stud anchors, report generated automatically to keep the consultant happy.

Adaptive torque system
Over-torqued and under-torqued anchors are among the most common causes of failed jobsite inspections

Torque: hard to see; easy to neglect. When it comes to anchoring in concrete, applying the right torque is critically important. In other words, if an anchor is not set with the specified torque, it is only a matter of time before defects appear. The American Construction Inspector Association (ACIA) ranks over-and under-torqued anchors as the number-two reason for failed jobsite inspections.

There are many reasons for why the specified torque would not be reached in reality. One of them being speed: with scheduling pressure increasing, finding the time to carefully set and check every single anchor is practically impossible. On top of that, experienced jobsite professionals are not always on site.

*Currently designed for select sizes of Hilti HST3 & HST2 anchors only.  Contact Hilti for details.


The AT system is made up of four components:

  • SIW 6AT-A22 cordless impact wrench: it looks and works like the Hilti SIW 22-A cordless impact wrench but with intelligent electronics, a more robust anvil and a sleeker front part which can reach into tighter spaces.
  • SI-AT-A22 module which is a small, very light interface which slots in between the impact wrench and battery and crunches live data from the SIW 6AT-A22 to recognize when an anchor has been correctly installed.
  • Documentation software so that the SI-AT-A22’s job history can be transferred to a PC and used to create a detailed installation certificate.
  • Stud Anchors for example Hilti HST 3, HST 2.

AT-ready tools are equipped with the sensors and on-board intelligence to confirm if an anchor has been torqued according to ETA approvals. The operator simply inputs which anchor is being used – as easy as scanning the box with the SI-AT-A22’s integrated barcode reader – and the tool does the rest. Afterwards, the tool can be connected to a computer to instantly generate an installation report, offering inspectors and specifiers a guarantee that the work has been carried out exactly as specified.

Simple, Fast, Effective

HST3 stud anchor, KB-TZ stud anchor, cordless impact wrench, adaptive torque module, compact battery, long socket

Select your anchor

Use the SI-AT-A22 module’s built-in scanner to read the barcode on your box of anchors. The SIW 6AT-A22 impact wrench then adjusts the torque setting to meet certification requirements. Tap the lock button to confirm your selection, and the impact wrench is ready to use

SIW 6AT-A22, SI-AT-A22, B22, SI-S, Pipe flange application, cordless impact wrench, adaptive torque module, compact battery, long socket

Pull the trigger

With the SIW 6AT-A22 impact wrench, all you need to do is pull the trigger and let the tool work. As soon as the SI-AT module lights up green, you know the anchor has been torqued to exactly the right level to comply with ETA approvals.

SIW 6AT-A22, SI-AT-A22, B22, SI-S, MQN, MQ Bracket, MQN galvanized, cordless impact wrench, adaptive torque module, compact battery, long socket

Adjust and retorque

Giving you confidence that the anchor has been correctly installed, sensors in the SIW 6AT-A22 recognize if an anchor has been loosened and, on retightening, will restore the correct torque. And with the AT System can you adjust and retorque up to three times.

Easily generate your installation report

Easily generate your installation report

Full accountability has never been easier. Simply connect the SI-AT-A22 module to a computer using a standard USB cable and the AT Documentation Software then downloads performance data stored by the SI-AT-A22, which can be used to produce an installation report.

The report lists all products used, the method of selection (scan or manual) and completion time and date.  

From a consultant's perspective, this report proves that the anchors have been correctly installed and meet certification requirements. From an installer’s point of view, it can help you breeze through site inspections.



Changes encouraged


The SIW 6AT-A22 impact wrench is intelligent enough to detect an anchor which has been tightened and then loosened again, a function which is useful for straightening or aligning neighboring fixtures, such as railings.

During this process the SI-AT-A22 module will use an algorithm, develop from over 10,000 tests, to retightening the anchor ensuring no over-torqueing occurs. Once complete, SI-AT-A22 provides a visual indication to the operator by flashing a yellow light, displaying a notification on display and plays a sound.

The anchor setting trifecta: SafeSet


Safety. Productivity. Approval. SafeSet is Hilti’s proven methodology for consistently high-quality anchor installation at lightning speed.

The SIW 6AT-A22, along with the SI-AT-A22 module, fulfills all SafeSet criteria because they save time and reduce costs while also removing scope for installation error.

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