{"id":2196,"date":"2026-02-09T11:26:43","date_gmt":"2026-02-09T11:26:43","guid":{"rendered":"https:\/\/www.viteriafusani.it\/?p=2196"},"modified":"2026-03-06T10:21:57","modified_gmt":"2026-03-06T10:21:57","slug":"screw-strength-classes","status":"publish","type":"post","link":"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/","title":{"rendered":"Screw Strength Classes (8.8, 10.9, 12.9): Table and Guide to Mechanical Properties"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]The strength classes of carbon steel or low-alloy steel screws and bolts indicate the level of mechanical strength provided, according to the <a href=\"https:\/\/www.iso.org\/obp\/ui\/en\/#iso:std:iso:898:-1:ed-5:v1:en\" target=\"_blank\" rel=\"noopener\">ISO 898-1 standard<\/a>.<br \/>\nThese classes allow you to specifically know the tensile strength and yield strength. This, of course, enables selecting the most suitable component for the application and the material used.<br \/>\nScrew strength classes apply to components with a nominal thread diameter of less than 39 mm.<br \/>\nThe class designation consists of two numbers separated by a dot:<\/p>\n<ul>\n<li>The first number indicates the <strong>minimum tensile strength<\/strong>;<\/li>\n<li>The second number represents <strong>the percentage ratio between the yield strength and the tensile strength<\/strong>.<\/li>\n<\/ul>\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\/screw-strength-classes\/#ISO_Nomenclature_for_Screws\" >ISO Nomenclature for Screws<\/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\/screw-strength-classes\/#Mechanical_Values_and_Typical_Uses_of_Screws\" >Mechanical Values and Typical Uses of Screws<\/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\/screw-strength-classes\/#Differences_in_Use_Between_Classes\" >Differences in Use Between Classes<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Class_88_Screws\" >Class 8.8 Screws<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Class_109_Screws\" >Class 10.9 Screws<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Class_129_Screws\" >Class 12.9 Screws<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Matching_Screws_and_Nuts\" >Matching Screws and Nuts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#What_Type_of_Strength_to_Look_for_in_Screws\" >What Type of Strength to Look for in Screws?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Stainless_Steel_Corrosion_Resistance_and_Mechanical_Strength\" >Stainless Steel, Corrosion Resistance, and Mechanical Strength<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/fusani.demosixor.it\/en\/screw-strength-classes\/#Materials_and_Quality_According_to_Viteria_Fusani\" >Materials and Quality According to Viteria Fusani<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"ISO_Nomenclature_for_Screws\"><\/span>ISO Nomenclature for Screws<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>As mentioned above, screws are identified by a numerical code (e.g., 8.8, 10.9, or 12.9) that defines their strength class.<br \/>\nThe calculation to determine the tensile and yield strength provided by the component is as follows:<\/p>\n<ul>\n<li>First number \u00d7 100 = minimum tensile strength (MPa).<\/li>\n<li>Second number \u00d7 10% \u00d7 first number = yield strength.<\/li>\n<\/ul>\n<p>This system allows for a quick comparison of the mechanical properties of different components and helps choose the correct screw based on the expected load.<br \/>\n<strong>For example, a class 8.8 screw can provide<\/strong>:<\/p>\n<ul>\n<li>Tensile strength \u2248 800 N\/mm\u00b2 (i.e., 8 \u00d7 100)<\/li>\n<li>Yield strength equal to 80% of tensile strength (i.e., 640 N\/mm\u00b2) (i.e., 8 \u00d7 80)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Mechanical_Values_and_Typical_Uses_of_Screws\"><\/span>Mechanical Values and Typical Uses of Screws<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Below is a comprehensive table showing the mechanical values offered by the most commonly used screw classes.<\/p>\n<table>\n<thead>\n<tr>\n<td><strong>Class<\/strong><\/td>\n<td><strong>Tensile Strength (N\/mm\u00b2)<\/strong><\/td>\n<td><strong>Yield Strength (N\/mm\u00b2)<\/strong><\/td>\n<td><strong>Typical Use<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>3.6<\/td>\n<td>300<\/td>\n<td>180<\/td>\n<td>Low-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>4.6<\/td>\n<td>400<\/td>\n<td>240<\/td>\n<td>Low-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>4.8<\/td>\n<td>400<\/td>\n<td>320<\/td>\n<td>Low-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>5.6<\/td>\n<td>500<\/td>\n<td>300<\/td>\n<td>Medium-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>5.8<\/td>\n<td>500<\/td>\n<td>400<\/td>\n<td>Medium-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>6.8<\/td>\n<td>600<\/td>\n<td>480<\/td>\n<td>Medium-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>8.8<\/td>\n<td>800<\/td>\n<td>640<\/td>\n<td>High-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>10.9<\/td>\n<td>1000<\/td>\n<td>900<\/td>\n<td>Very high-strength bolts<\/td>\n<\/tr>\n<tr>\n<td>12.9<\/td>\n<td>1200<\/td>\n<td>1080<\/td>\n<td>Very high-strength bolts<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Naturally, higher classes are generally used in applications subjected to high loads and cyclic stresses, where good resistance is required.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2115 size-full\" src=\"https:\/\/www.viteriafusani.it\/wp-content\/uploads\/2026\/02\/Foto-2-Articolo-1.jpg\" alt=\"Alcune viti sottoposte a test per determinare la classe di resistenza\" width=\"950\" height=\"1000\" srcset=\"https:\/\/fusani.demosixor.it\/wp-content\/uploads\/2026\/02\/Foto-2-Articolo-1.jpg 950w, https:\/\/fusani.demosixor.it\/wp-content\/uploads\/2026\/02\/Foto-2-Articolo-1-285x300.jpg 285w, https:\/\/fusani.demosixor.it\/wp-content\/uploads\/2026\/02\/Foto-2-Articolo-1-768x808.jpg 768w\" sizes=\"auto, (max-width: 950px) 100vw, 950px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Differences_in_Use_Between_Classes\"><\/span>Differences in Use Between Classes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Here are some examples of screw use based on their strength class.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Class_88_Screws\"><\/span>Class 8.8 Screws<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>This class provides components suitable <strong>for general and light structural applications<\/strong>. It offers a good balance between strength and cost.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Class_109_Screws\"><\/span>Class 10.9 Screws<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Components in this class are used for more <strong>demanding mechanical situations<\/strong>, such as engines and industrial machines, where higher yield strength is required.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Class_129_Screws\"><\/span>Class 12.9 Screws<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Screws in this strength class can be <strong>used in extreme conditions<\/strong>, with <strong>high loads and concentrated stresses<\/strong>. <strong>Hardened alloy steel<\/strong> is often used for this class of screws, which ensures maximum safety.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Matching_Screws_and_Nuts\"><\/span>Matching Screws and Nuts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To ensure proper functioning of the threaded connection, the <strong>correct match<\/strong> between the screw class and nut class must be observed. Below is a table showing nut classes and compatible screw classes.<\/p>\n<table cellspacing=\"3\">\n<thead>\n<tr>\n<td><strong>Nut Class<\/strong><\/td>\n<td><strong>Compatible Screw Classes<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>4A<\/td>\n<td>3.6 \u2013 4.6<\/td>\n<\/tr>\n<tr>\n<td>4D<\/td>\n<td>4.6 \u2013 4.8<\/td>\n<\/tr>\n<tr>\n<td>5S<\/td>\n<td>4.8 \u2013 5.6<\/td>\n<\/tr>\n<tr>\n<td>6S<\/td>\n<td>5.6 \u2013 5.8 \u2013 6.6<\/td>\n<\/tr>\n<tr>\n<td>8G<\/td>\n<td>6.8 \u2013 8.8<\/td>\n<\/tr>\n<tr>\n<td>10K<\/td>\n<td>8.8 \u2013 10.9 \u2013 12.9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"What_Type_of_Strength_to_Look_for_in_Screws\"><\/span>What Type of Strength to Look for in Screws?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When discussing screw strength, it is important to understand <strong>what type of strength is actually required<\/strong>.<br \/>\nIf high tensile strength and core hardness are needed, suitable for withstanding high loads without deforming, screws of class 8.8 or higher should be chosen, often obtained through <strong>tempering treatments<\/strong> that harden the entire material.<br \/>\nIf surface strength is the primary concern, such as ensuring proper thread formation in the material, the best solution is screws with surface hardening, obtained through <strong>carburizing or carbonitriding treatments<\/strong>.<br \/>\nSo, understanding if core or surface strength is required, is the first step in selecting the correct screw.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Stainless_Steel_Corrosion_Resistance_and_Mechanical_Strength\"><\/span>Stainless Steel, Corrosion Resistance, and Mechanical Strength<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Stainless steel is often automatically associated with a \u201cstrong\u201d material.<br \/>\nIn reality, this strength <strong>mainly refers to corrosion resistance<\/strong>, due to its chemical composition and chromium content (with differences between more or less ferritic stainless steels).<br \/>\nIf mechanical strength and hardness are needed, it is important to specify the required performance. Stainless steel screws can also be produced in different strength classes.<\/p>\n<p>At <strong>Viteria Fusani<\/strong>, we also produce stainless steel screws in <strong>A2-50, A2-70<\/strong>, and A2-80 according to <strong><a href=\"https:\/\/it.scribd.com\/document\/804219584\/ISO-3506-20\" target=\"_blank\" rel=\"noopener\">ISO 3506<\/a><\/strong>. This allows selecting the most suitable solution based on the loads to be supported and the function of the connection.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Materials_and_Quality_According_to_Viteria_Fusani\"><\/span>Materials and Quality According to Viteria Fusani<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Viteria Fusani<\/strong>, a manufacturer since 1955, produces <strong>high-quality screws<\/strong> using quality steels and certified heat treatments.<br \/>\nThis ensures compliance with ISO strength classes, reliability, and long life of every component produced.<br \/>\nViteria Fusani always keeps the customer\u2019s needs in mind, to understand the expected performance of the screw and propose the right solution, while respecting the technical standards required by industry regulations.<br \/>\nThe company experience, gained through <strong>years of <em>solving problems<\/em><\/strong>, has allowed to identify the best cycles to ensure repeatable and constant results.[\/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 strength classes of carbon steel or low-alloy steel screws and bolts indicate the level of mechanical strength provided, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2196","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>Screw strength classes (8.8, 10.9, 12.9): table and guide<\/title>\n<meta name=\"description\" content=\"Read the article to learn everything about the strength classes of carbon or low-alloy steel 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