{"id":3922,"date":"2026-08-06T07:38:42","date_gmt":"2026-08-06T07:38:42","guid":{"rendered":"https:\/\/www.rlfasteners.com\/?p=3922"},"modified":"2026-09-02T07:58:00","modified_gmt":"2026-09-02T07:58:00","slug":"torque-to-yield-bolts-guide","status":"publish","type":"post","link":"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/","title":{"rendered":"Torque-to-Yield Bolts: How Does Permanent Plastic Deformation Impact Engine Cylinder Head Clamp Force?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_69_1 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\">\u00cdndice<\/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=\"Alternar \u00cdndice\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/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 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Quick_Answer\" title=\"Quick Answer:\">Quick Answer:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Why_did_TTY_bolts_change_engine_assembly\" title=\"Why did TTY bolts change engine assembly?\">Why did TTY bolts change engine assembly?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#What_are_torque-to-yield_bolts\" title=\"What are torque-to-yield bolts?\">What are torque-to-yield bolts?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#How_plastic_deformation_affects_clamp_force\" title=\"How plastic deformation affects clamp force\">How plastic deformation affects clamp force<\/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:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#How_do_TTY_bolts_compare_with_standard_bolts\" title=\"How do TTY bolts compare with standard bolts?\">How do TTY bolts compare with standard bolts?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Can_you_reuse_torque-to-yield_bolts\" title=\"Can you reuse torque-to-yield bolts?\">Can you reuse torque-to-yield bolts?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Why_replacement_is_normally_required\" title=\"Why replacement is normally required\">Why replacement is normally required<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#How_can_TTY_bolts_be_identified_in_automotive_applications\" title=\"How can TTY bolts be identified in automotive applications?\">How can TTY bolts be identified in automotive applications?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Common_identification_clues\" title=\"Common identification clues\">Common identification clues<\/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:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/torque-to-yield-bolts-guide\/#Why_does_CNRL_manufacture_OEM-grade_TTY_bolts\" title=\"Why does CNRL manufacture OEM-grade TTY bolts?\">Why does CNRL manufacture OEM-grade TTY bolts?<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quick_Answer\"><\/span><strong>Quick Answer<\/strong>:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Torque-to-yield bolts deform plastically during installation and are designed to do so. Deformation in the plastic zone ensures uniform distribution of load on an engine cylinder head and gasket. Permanent deformation is another reason why torque-to-yield bolts need to be changed once installed in the assembly and should not be reused, as it may change the nature of clamping. CNRL makes automotive fasteners for engines, chassis, transmissions, and other automotive components.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_did_TTY_bolts_change_engine_assembly\"><\/span>Why did TTY bolts change engine assembly?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The cylinder heads should provide gasket compression under varying conditions of engine heating, cooling, vibrations, and combustion pressure. In this respect, the fasteners must provide controlled clamping force through the joint.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Traditionally, bolts normally operate in the elastic region when tightened. The stretching is reversible, which allows for returning to the initial length of the bolt after it is unloaded.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TTY fasteners operate using another principle. The bolts are tightened until controlled plastic deformation takes place, which may lead to obtaining more controlled clamp force.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It has been discovered in cylinder head fastening research that torque-angle tightening is better than direct torque tightening in providing clamp force control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This technique is especially effective in cases where the seal of the gasket requires even distribution of forces on the cylinder head.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_torque-to-yield_bolts\"><\/span><strong>What are<\/strong> <strong>torque-to-yield bolts<\/strong>?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">UM <strong>torque-to-yield bolt<\/strong> is a type of fastener that goes past its elastic limit when tightened. Until the point of yielding, the bolt experiences elastic stretching. When the load is released, most of this stretch will return to the bolt. Once the yield point is achieved, some of this stretch will be permanent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_plastic_deformation_affects_clamp_force\"><\/span>How plastic deformation affects clamp force<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It is not just the goal to stretch the fastener to its maximum extent. There is a tightening requirement that dictates the extent of deformation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For most cases of cylinder head bolts, it requires a torque followed by an angle. The torque angle method minimizes the influence of friction in the formation of the clamp load.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This leads to better control of the interaction of the bolt stretch and the clamp load. This is important for the sealing capability of a cylinder head gasket throughout the engine operating range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CNRL&#8217;s guide on <a href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/what-is-fastener-tensile-strength-and-yield-strength\/\" target=\"_blank\" rel=\"noreferrer noopener\">fastener tensile strength and yield strength<\/a> provides additional background on these material properties.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_do_TTY_bolts_compare_with_standard_bolts\"><\/span>How do TTY bolts compare with standard bolts?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The main difference in torque-to-yield vs regular bolts is the intended deformation range during tightening.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Recurso<\/strong><\/td><td><strong>TTY Bolt<\/strong><\/td><td><strong>Standard Bolt<\/strong><\/td><\/tr><tr><td>Tightening approach<\/td><td>Torque and angle often specified<\/td><td>Torque commonly specified<\/td><\/tr><tr><td>Elastic deformation<\/td><td>Sim<\/td><td>Sim<\/td><\/tr><tr><td>Plastic deformation<\/td><td>Intentional<\/td><td>Normally avoided<\/td><\/tr><tr><td>Permanent stretch<\/td><td>Expected<\/td><td>Normally absent<\/td><\/tr><tr><td>Reuse<\/td><td>Usually not permitted<\/td><td>May be permitted<\/td><\/tr><tr><td>Common application<\/td><td>Cylinder heads and critical joints<\/td><td>General automotive assemblies<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A standard bolt is normally selected to remain within its elastic range. A TTY fastener is specifically designed to enter a controlled yield range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This difference affects replacement requirements. A bolt that has already yielded cannot be expected to behave exactly like a new bolt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CNRL also explains the basic role and construction of <a href=\"https:\/\/www.rlfasteners.com\/pt\/blog\/automotive-fastener\/bolt\/what-is-a-bolt-in-automotive\/\" target=\"_blank\" rel=\"noreferrer noopener\">parafusos automotivos<\/a> in its related guide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_you_reuse_torque-to-yield_bolts\"><\/span><strong>Can you reuse torque-to-yield bolts<\/strong>?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The short answer is generally no. This question frequently arises when working on cylinder heads. The moment the bolt stretches past its elastic limit, it alters in size and material behavior. Hence, reuse of this fastener would give different clamp load values at the same torque specification level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_replacement_is_normally_required\"><\/span>Why replacement is normally required<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A number of reasons exist for why replacement is normally needed when dealing with yielded <a href=\"https:\/\/www.rlfasteners.com\/pt\/products\/068103384a-m12x1-75x115-carbon-steel-hex-socket-cap-cylinder-head-bolt\/\" target=\"_blank\" rel=\"noreferrer noopener\">cylinder head bolts<\/a>. These include the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Permanently elongated.<\/li>\n\n\n\n<li>Reduced deformation capability.<\/li>\n\n\n\n<li>Different clamp load compared to new bolts.<\/li>\n\n\n\n<li>The bolt is single-use by the manufacturer.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">CNRL&#8217;s guidelines for automotive fasteners also indicate that some fasteners cannot be reused after being subjected to heavy loads, overheating, or multiple tightening.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are some cases where there are clear guidelines regarding how to inspect the bolts. However, a general visual inspection must not take precedence over instructions from the engine manufacturer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_can_TTY_bolts_be_identified_in_automotive_applications\"><\/span>How can TTY bolts be identified in automotive applications?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Knowing how to identify torque-to-yield bolts starts with the manufacturer&#8217;s service information. This is more dependable than judging the bolt from its appearance. A service manual may specify torque followed by an angle of rotation. It may also state that the cylinder head fasteners require replacement after removal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_identification_clues\"><\/span>Common identification clues<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Several features can help identify a possible TTY fastener:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Torque-plus-angle tightening specifications.<\/li>\n\n\n\n<li>A reduced-diameter section along the shank.<\/li>\n\n\n\n<li>A manufacturer instruction requiring replacement.<\/li>\n\n\n\n<li>A part number linked to a specific cylinder head application.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The bolt&#8217;s appearance alone is not enough. A yielded fastener can look normal even after permanent deformation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For procurement, the engine model, original part number, dimensions, thread specification, material, and required mechanical properties should all be checked.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_does_CNRL_manufacture_OEM-grade_TTY_bolts\"><\/span>Why does CNRL manufacture OEM-grade TTY bolts?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cylinder head fasteners are application-specific components. Material strength, dimensions, thread accuracy, heat treatment, and surface condition can all affect their performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CNRL manufactures automotive fasteners for OEM and specialized applications. Its automotive range covers engine, chassis, body, transmission, and brake system components. The company lists performance classes from 4.8 to 12.9, with diameters from 3 mm to 30 mm and lengths from 6 mm to 300 mm.<\/p>\n\n\n\n<style>\n  .product-card {\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    height: 400px;\n    border: 1px solid #ddd;\n    border-radius: 10px;\n    overflow: hidden;\n    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);\n    max-width: 900px;\n    margin: 0 auto;\n    gap: 40px;\n    padding: 20px;\n    box-sizing: border-box;\n  }\n\n  .product-left,\n  .product-right {\n    flex: 1 1 50%;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    align-items: center;\n    text-align: center;\n  }\n\n  .product-left {\n    gap: 20px;\n  }\n\n  .product-title {\n    font-size: 24px;\n    font-weight: 700;\n    color: #b59d53;\n    margin: 0;\n  }\n\n  .product-details {\n    margin: 0;\n    color: #555;\n    font-size: 14px;\n    line-height: 1.5;\n  }\n\n  .product-button {\n    background-color: transparent;\n    color: #b59d53;\n    border: 2px solid #b59d53;\n    padding: 12px 24px;\n    font-size: 15px;\n    border-radius: 6px;\n    cursor: pointer;\n    transition: all 0.3s ease;\n    text-decoration: none;\n    display: inline-block;\n  }\n\n  .product-button:hover {\n    border-color: #333333;\n    color: #333333;\n    transform: scale(1.1);\n  }\n\n  .product-right img {\n    max-width: 100%;\n    max-height: 360px;\n    object-fit: contain;\n    border-radius: 10px;\n  }\n\n  @media (max-width: 768px) {\n    .product-card {\n      flex-direction: column;\n      height: auto;\n      padding: 15px;\n      gap: 15px;\n    }\n\n    .product-left,\n    .product-right {\n      flex: none;\n      width: 100%;\n      text-align: center;\n    }\n\n    .product-right img {\n      max-height: 300px;\n      margin-bottom: 15px;\n    }\n\n    .product-left {\n      order: 2;\n      gap: 10px;\n      align-items: center;\n    }\n\n    .product-right {\n      order: 1;\n    }\n  }\n<\/style>\n\n<div class=\"product-card\">\n  <div class=\"product-right\">\n    <img decoding=\"async\" src=\"https:\/\/www.rlfasteners.com\/wp-content\/uploads\/2022\/07\/%E4%B8%BB%E5%9B%BE-02-8.jpg\" alt=\"Parafuso sextavado automotivo galvanizado colorido n\u00e3o padr\u00e3o grau 10.9\">\n  <\/div>\n  <div class=\"product-left\">\n    <p class=\"product-title\">Parafuso sextavado automotivo galvanizado colorido n\u00e3o padr\u00e3o grau 10.9<\/p>\n    <div class=\"product-details\">\n      <p style=\"margin: 0;\"><strong>Shape:<\/strong> Round<\/p>\n      <p style=\"margin: 0;\"><strong>Size:<\/strong> M3-M72(3\/16\u201d- 4\u201d)<\/p>\n      <p style=\"margin: 0;\"><strong>Color:<\/strong> Zinc White<\/p>\n    <\/div>\n    <a href=\"https:\/\/www.rlfasteners.com\/pt\/products\/grade10-9-non-standard-color-zinc-plated-automobile-standard-hex-bolt\/\" target=\"_blank\" class=\"product-button\">Mais detalhes<\/a>\n  <\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CNRL also provides custom fastener solutions based on application requirements. Its stated quality systems include <a href=\"https:\/\/www.rlfasteners.com\/pt\/industry\/iatf-16949-certification-fastener-manufacturers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Norma IATF 16949<\/a>, ISO 14001, and ISO 45001.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This production approach is useful when a project requires a specific bolt design rather than a standard catalog fastener.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For manufacturers, distributors, and automotive parts suppliers seeking <strong>torque-to-yield bolts<\/strong> for cylinder head applications, CNRL can support application-specific requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.rlfasteners.com\/pt\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contato CNRL<\/a> to discuss TTY cylinder head bolts, OEM fastener requirements, or custom automotive fastening projects.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div style=\"--wp--block-button--width: 50;\" class=\"wp-block-button has-custom-width wp-block-button__width wp-block-button__width-50\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-medium-font-size has-custom-font-size wp-element-button\" href=\"https:\/\/www.rlfasteners.com\/pt\/contact\/\" style=\"background-color:#b59d53\" target=\"_blank\" rel=\"noreferrer noopener\">Obtenha um or\u00e7amento gratuito<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Quick Answer: Torque-to-yield bolts deform plastically during installation and are designed to do so. Deformation in the plastic zone ensures uniform distribution of load on an engine cylinder head and gasket. Permanent deformation is another reason why torque-to-yield bolts need to be changed once installed in the assembly and should not be reused, as it [&hellip;]<\/p>","protected":false},"author":1,"featured_media":3924,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[186],"tags":[],"class_list":["post-3922","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bolt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Torque-to-Yield Bolts: Clamp Force, Reuse &amp; Identification | CNRL<\/title>\n<meta name=\"description\" content=\"Learn what torque-to-yield bolts are, why they are normally replaced, how to identify them, and how plastic deformation affects clamp force.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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