TnA® FAQ Page2017-03-06T08:18:32-05:00


Do the tools need to be calibrated regularly?2014-07-30T16:52:49-05:00

The TA Series tools use a combination of torque for snugging and angle for final installation. Each of these functions require calibration at least annually. A quick way to verify snug torque is to use one of our Digital Torque Meters. The DTM can be easily attached to the TA Series Wrenches and will produce a real time torque that is displayed on the digital read out. If the reading on the DTM is close to the rated output of the tool you know your calibration is good.

Will the tool fit in my connection area?2017-03-22T05:05:33-05:00

The TA Series tools used with TNA® bolts will fall within current clearance guideline found in AISC Manual Table 7. Stagger and Clearance drawings are available for download.

Will I pay more if I use TNA®?2017-03-22T05:01:55-05:00

The short answer is no. TNA® is made from readily available raw material and doesn’t require any special manufacturing practices. In fact, in some applications using TNA® can save you as much as 30% on fastener cost alone. The greatest savings can be returned when taking advantage of TNA® strength values which can reduce your total installed cost by as much as 20%.

When I specify TNA® what design criteria should I use?2017-03-22T05:06:45-05:00

TNA® can be used and specified in a few ways. The first way is a direct replacement for ASTM A325 and F1852 bolts. TNA® bolts are made of the same raw material and conform to the same dimensional standards. So using existing A325 design criteria will apply. The other way is to use A490 design criteria. This is where you get the full value of TNA®. The system is designed around capturing the inherent strength available in modern raw materials used to make A325 bolts. By making a small change to hardness and controlling both steps of the installation process we can achieve A490 tension values. Our minimum tension values are A490 tension values, so all existing software packages can make the switch without any outside calculation.

How do I specify TNA® for my project?2017-03-22T05:07:07-05:00

Simple. Download and review the Product Submittal. Call out TNA® by name in your project documents. LeJeune can provide 3 levels of technical support to help with the process and will work with your General Contractor and their sub contractors to instruct and train personnel in the application of the system.

What is “144”?2017-03-22T04:59:04-05:00

The “144” in TNA® 144 is the minimum tensile strength of the bolts; 144ksi. A325 is 120ksi and A490 is 150ksi. Our 144 ksi tensile strength allows us to use A325 raw material but achieve A490 tension values. We get all the benefits of A325 like ductility, coating options, and low cost while gaining the value of a higher strength fastener that will allow for fewer bolts in a connection.

Why doesn’t the spline come off during installation?2017-03-22T04:59:42-05:00

The TNA® bolt is a fixed spline fastener, meaning the tip will not be removed during installation. There are a few reasons for the design. Primarily the spline remains fixed to the bolt because we are performing a 2-step installation process with the TA Series Wrenches, snug tight and final installation using angle. Some other benefits to a fixed spline bolt are; No touch up of bare metal for mechanically galvanized bolts, no drop or slip hazard of loose tips in the shop or on the jobsite, and easy removal when required with a single tool from a single side.

Will the spline interfere with installation?2017-03-22T05:00:06-05:00

There isn’t a fastener available that can meet 100% of the clearance issues found on jobsite every day. The spline of the TNA® bolt is within the detailing clearance recommended in the AISC Design manual, Table 7. In short, the TnA™ bolt should not interfere with bolt installation if AISC design criteria is followed for clearance and stagger.