{"id":5160,"date":"2025-06-30T14:31:31","date_gmt":"2025-06-30T12:31:31","guid":{"rendered":"https:\/\/www.traxx-group.com\/en\/?p=5160"},"modified":"2025-05-28T14:49:54","modified_gmt":"2025-05-28T12:49:54","slug":"industrial-fastening-why-tension-matters-more-than-torque","status":"publish","type":"post","link":"https:\/\/www.traxx-group.com\/en\/2025\/06\/30\/industrial-fastening-why-tension-matters-more-than-torque\/","title":{"rendered":"Rethinking Industrial Fastening: Why Tension Matters More Than Torque"},"content":{"rendered":"\t\t
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Rethinking Industrial Fastening: why tension matters more than torque<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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At TRAXX, we\u2019ve made it our mission to address this issue head-on by focusing on what truly matters: measuring and controlling BOLT TENSION<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\ud83d\udd29 The Problem with Traditional Torque-Based Tightening<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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For decades, most bolted joints have been assembled using torque tightening<\/strong> \u2014 applying a predefined amount of torque, based on the assumption that it directly correlates with the tension inside the bolt.<\/p>

That assumption is not only flawed \u2014 it\u2019s dangerously imprecise.<\/p>

According to Michel Berbesson, Technical Director at TRAXX, field data shows that torque-based methods can result in tension variations of \u00b150%<\/strong>, even when using calibrated tools and skilled operators.<\/p>

Why? Because 80% of the torque is lost to friction<\/strong>, and only 20% contributes to actual bolt stretch.
And friction is unpredictable \u2014 it varies with lubrication, surface finish, temperature, humidity, corrosion, and more.
A small change in friction can dramatically shift the amount of tension, without any indication to the operator.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\ud83d\udcd0 Precision Cannot Be Assumed \u2014 It Must Be Measured<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Even the most advanced torque wrenches in the world can\u2019t guarantee consistent tension.
When bolts are too tight, you risk thread damage or shearing. When they\u2019re too loose, joints can loosen or fail entirely.<\/p>

Industries like aerospace, automotive, energy, and nuclear power \u2014 where safety is non-negotiable \u2014 can no longer afford to rely on guesswork.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\ud83d\udee0 What Actually Holds a Bolted Joint Together?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The key to joint integrity isn\u2019t torque \u2014 it\u2019s tension<\/strong>.<\/p>

Tension is the axial force created when a bolt is stretched.<\/a> This clamping force presses the assembled components together and keeps them from separating during use.
It is this internal force \u2014 measured in newtons (N) or kilonewtons (kN) \u2014 that defines whether a joint will hold or fail.<\/p>

Yet, most operators don\u2019t have access to tension measurement tools during assembly.
Instead, engineers provide torque targets calculated from CAD simulations and theoretical tables \u2014 because torque is the only variable they can easily control.<\/strong><\/p>

But controlling torque doesn’t mean controlling tension. And that\u2019s the heart of the issue.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\ud83d\udd27 The TRAXX Approach: Measure What Matters<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fortunately, there\u2019s a proven and precise alternative:
Ultrasonic tension measurement.<\/strong><\/p>

When a bolt is tightened, it elongates slightly. By sending an ultrasonic pulse through the bolt and measuring its travel time (time of flight), it\u2019s possible to determine the change in length \u2014 and therefore the actual bolt tension.<\/p>

This technique, though known since the 1970s, was once unreliable due to poor electronics.
Today, with high-performance systems like TRAXX-M2<\/strong>, this method is now fast, accurate, and non-intrusive<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\ud83d\udd04 But Can You Measure Tension After Tightening?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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This is the question we hear most. And the honest answer is:
\u274c No, you cannot measure the tension of an already-tightened bolt unless you recorded its initial condition.<\/strong><\/p>

Even so-called \u201cabsolute\u201d methods tested over the past 40 years have proven too inconsistent to be reliable.
Empirical alternatives, such as breakaway torque tests, are often misleading \u2014 a rusted bolt may require huge torque to loosen, even though the tension is zero.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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TRAXX-M2: Reliable Tension, From Day One<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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That\u2019s why the only reliable solution is to measure tension from the beginning.<\/strong><\/p>

TRAXX developed the M2 system<\/strong>, a \u201cplug & play\u201d ultrasonic tension meter designed to deliver real-time, high-precision measurements of bolt load.<\/p>

With TRAXX-M2, you can:<\/p>

  • \ud83d\udd29 Tighten bolts directly to their specified tension during assembly \u2014 fast, accurate, and repeatable.<\/p><\/li>

  • \ud83d\udd0d Check existing tension at any time, without disassembling the joint (measurement takes just seconds).<\/p><\/li>

  • \ud83d\udcc8 Monitor tension changes in real-time during machine operation \u2014 ideal for predictive maintenance.<\/p><\/li><\/ul>

    Already in use by leading manufacturers in aerospace, nuclear energy, and transportation, TRAXX-M2 sets a new standard for bolted joint control.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"automotive\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Conclusion: From Torque to Tension<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Torque-based tightening is a legacy method.
    Modern industry demands higher performance, tighter control, and fewer failures.<\/p>

    And that begins by measuring what really matters<\/strong>:
    \"\u2705\" Tension.<\/strong><\/p>

    TRAXX helps manufacturers shift from assumptions to certainty \u2014 one bolt at a time.<\/p>

    \"\ud83d\udcde\" Want to learn more about ultrasonic tension measurement?
    Reach out to our team of experts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    In the world of industrial assembly, bolts and nuts remain essential. They\u2019re simple, cost-effective, and quick to install.
    \nBut behind this simplicity lies a persistent problem \u2014 one that costs time, money, and sometimes even safety.<\/p>\n","protected":false},"author":2,"featured_media":5161,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-5160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nIndustrial Fastening: Why Tension Matters More Than Torque<\/title>\n<meta name=\"description\" content=\"At TRAXX, we\u2019ve made it our mission to address this issue head-on by focusing on what truly matters: measuring and controlling BOLT TENSION.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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