{"id":2205,"date":"2026-02-27T07:30:44","date_gmt":"2026-02-27T07:30:44","guid":{"rendered":"https:\/\/www.viteriafusani.it\/coppia-serraggio-viti-metriche\/"},"modified":"2026-03-20T13:43:12","modified_gmt":"2026-03-20T13:43:12","slug":"coppia-serraggio-viti-metriche","status":"publish","type":"post","link":"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/","title":{"rendered":"The Tightening Guide: What Is the Tightening Torque of Metric Screws and How Is It Calculated?"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<strong>The tightening torque of metric screws<\/strong> is the torque applied to generate the correct preload in the screw, with the aim of ensuring stability and safety of the joint.<br \/>\nCorrect tightening <strong>prevents breakage, loosening, and loss of performance<\/strong> of the assembly.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\"><\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Why_is_tightening_torque_fundamental\" >Why is tightening torque fundamental?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#The_3_factors_that_influence_tightening_torque\" >The 3 factors that influence tightening torque<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Why_a_screw_breaks_if_tightened_too_much\" >Why a screw breaks if tightened too much<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Why_a_screw_loosens_if_tightened_too_little\" >Why a screw loosens if tightened too little<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Tightening_torques\" >Tightening torques<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Technical_note\" >Technical note<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Mechanical_and_chemical_locking_systems_to_maintain_tightening_over_time\" >Mechanical and chemical locking systems to maintain tightening over time<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/fusani.demosixor.it\/en\/coppia-serraggio-viti-metriche\/#Tightening_torque_not_only_numbers_but_knowledge\" >Tightening torque: not only numbers, but knowledge<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"Why_is_tightening_torque_fundamental\"><\/span>Why is tightening torque fundamental?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Tightening torque<\/strong> is the rotational force applied to a screw to obtain <strong>controlled preload.<br \/>\n<\/strong>The purpose of this action is not the most obvious one of \u201clocking\u201d the parts together, but rather to <strong>elastically tension the screw<\/strong>. In practice, the screw becomes a real spring that keeps the components together.<br \/>\nIn fact, according to our experience at <strong>Viteria Fusani<\/strong>, manufacturing screws since 1955, most problems in bolted joints <strong>do not originate from the screw itself, but from incorrect tightening<\/strong>.<br \/>\nCorrect screw tightening is able to provide long-term stability, resistance to vibrations and dynamic loads, structural safety, and extended component life.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_3_factors_that_influence_tightening_torque\"><\/span>The 3 factors that influence tightening torque<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>More than 85\u201390% of the applied tightening torque is <strong>absorbed by friction<\/strong>. For this reason, <strong>Viteria Fusani<\/strong> recommends always considering these three fundamental factors:<\/p>\n<ul>\n<li><strong>Lubrication<\/strong><br \/>\nA lubricated screw <strong>reduces friction and increases preload<\/strong> for the same torque value. Applying a \u201cdry\u201d torque value to a lubricated screw can lead to overload and breakage.<\/li>\n<li><strong>Surface coating<\/strong><br \/>\nZinc plating, black oxide treatment, special treatments, or anti-friction coatings significantly modify friction.<\/li>\n<li><strong>Material of the screw and the clamped components<\/strong><br \/>\n<strong>Strength class, elastic modulus, and hardness<\/strong> influence load distribution and the elastic response of the joint.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Why_a_screw_breaks_if_tightened_too_much\"><\/span>Why a screw breaks if tightened too much<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Excessive tightening pushes the screw beyond its <strong>elastic limit<\/strong>. This action triggers crack initiation or permanent deformation, and the preload does not increase further.<br \/>\nTypical consequences of excessive tightening are immediate breakage of the element, delayed failure after load application, or subsequent fatigue failure.<br \/>\nTherefore, most of the time the screw is not defective: it has simply been <strong>tightened beyond the correct<\/strong><strong>value.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_a_screw_loosens_if_tightened_too_little\"><\/span>Why a screw loosens if tightened too little<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>On the other hand, insufficient preload in screw tightening <strong>does not ensure complete adhesion between the surfaces.<br \/>\n<\/strong>In fact, when preload is insufficient, micro-movements occur, progressive loss of tension develops, and spontaneous separation of the surfaces begins.<br \/>\nIn the presence of vibrations or alternating loads, the screw <strong>loosens even if it initially \u201cseems tight<\/strong>\u201d.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tightening_torques\"><\/span>Tightening torques<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>It is not possible to create a universal table for tightening torques, as these values may vary significantly depending on several factors, such as lubrication, surface treatments, strength class, screw geometry, and assembly conditions.<br \/>\nTo determine the correct values, it is recommended to refer to the applicable technical standards (e.g. ISO 898-7 for breaking torques).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Technical_note\"><\/span>Technical note<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Correct tightening always comes from the combination of <strong>calculation, experience, and real application.<br \/>\n<\/strong>However, there are factors that must be considered:<\/p>\n<ul>\n<li>In the presence of <strong>lubrication or low-friction coatings<\/strong>, the torque may be reduced by up to 40%.<\/li>\n<li>For <strong>12.9<\/strong> screws, tightening control is even more critical: there is a high risk of breakage due to overload.<\/li>\n<li>The use of <strong>thread lockers or polyamide patches<\/strong> modifies the behavior of the thread.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Mechanical_and_chemical_locking_systems_to_maintain_tightening_over_time\"><\/span>Mechanical and chemical locking systems to maintain tightening over time<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Correct tightening does not depend only on the applied torque. In many applications it is necessary <strong>to act on the behavior of the thread.<br \/>\n<\/strong>Other solutions to ensure proper tightening include:<\/p>\n<ul>\n<li><strong>Polyamide inserts (nylon patch)<\/strong><br \/>\nInserted directly on the thread, they increase friction and prevent loosening without damaging the joint.<\/li>\n<li><strong>Chemical thread lockers<br \/>\nAnaerobic resins<\/strong> that polymerize in the absence of air, ideal for applications subject to vibrations.<\/li>\n<li><strong>Safety washers<\/strong><br \/>\nSpring, toothed, or wedge-lock washers contribute to tightening stability.<\/li>\n<li><strong>Self-locking nuts<\/strong><br \/>\nThey incorporate elastic elements or controlled deformation to maintain preload.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tightening_torque_not_only_numbers_but_knowledge\"><\/span>Tightening torque: not only numbers, but knowledge<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tables are useful tools, but <strong>they do not replace the analysis of the real application.<br \/>\n<\/strong>Correct tightening comes from the combination of theoretical calculation, practical experience, and knowledge of materials.<br \/>\nUnderstanding <strong>what the tightening torque of metric screws is and evaluating all its critical aspects<\/strong> means preventing failures, increasing safety, and improving the durability of assemblies.<\/p>\n<p>This is precisely the approach that has always distinguished <strong>Viteria Fusani, screw manufacturer since 1955<\/strong>, in supplying reliable fastening solutions.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]The tightening torque of metric screws is the torque applied to generate the correct preload in the screw, with [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2167,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-insights"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is metric screw torque and how is it calculated?<\/title>\n<meta name=\"description\" content=\"Correctly tightening screws helps prevent breakage, loosening, and performance losses during assembly. 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