{"id":97656,"date":"2023-12-05T03:17:58","date_gmt":"2023-12-05T11:17:58","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=97656"},"modified":"2024-02-19T15:08:07","modified_gmt":"2024-02-19T23:08:07","slug":"common-reasons-why-vehicle-fasteners-fail","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/common-reasons-why-vehicle-fasteners-fail\/","title":{"rendered":"Common Reasons Why Vehicle Fasteners Fail"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_5e6dab-1b > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_5e6dab-1b > .kt-inside-inner-col,.kadence-column_5e6dab-1b > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_5e6dab-1b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_5e6dab-1b > .kt-inside-inner-col{flex-direction:column;}.kadence-column_5e6dab-1b > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_5e6dab-1b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_5e6dab-1b{position:relative;}@media all and (max-width: 1024px){.kadence-column_5e6dab-1b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_5e6dab-1b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_5e6dab-1b qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-d48de1  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-296795\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_83b171-69, .wp-block-kadence-advancedheading.kt-adv-heading_83b171-69[data-kb-block=\"kb-adv-heading_83b171-69\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_83b171-69 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_83b171-69[data-kb-block=\"kb-adv-heading_83b171-69\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_83b171-69 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_83b171-69[data-kb-block=\"kb-adv-heading_83b171-69\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_83b171-69 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_83b171-69\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Fasteners are responsible for connecting and securing parts of a vehicle. Despite being made from durable metals, fasteners can still fail for various reasons.<\/li><li>Fasteners can fail because of tensile overload, torsional wear, corrosion, hydrogen embrittlement, and cyclic fatigue.<\/li><li>If you want to avoid fastener failures, you have to understand a fastener&rsquo;s weaknesses so that you can implement correct design and installation practices.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/stud\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Studs\">Studs<\/a>, <a href=\"https:\/\/www.carparts.com\/rivet\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"rivets\">rivets<\/a>, <a href=\"https:\/\/www.carparts.com\/bolt\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"bolts\">bolts<\/a>, <a href=\"https:\/\/www.carparts.com\/screw\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"screws\">screws<\/a>, <a href=\"https:\/\/www.carparts.com\/clamp-set\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"clamps\">clamps<\/a>, and pins are examples of fasteners. Without them, many components won&rsquo;t be able to be connected securely. Despite being made from durable metals, fasteners can still fail for various reasons. In this article, we&rsquo;ll go through the reasons why fasteners fail.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mechanical Failure or Tensile Overload<\/h3>\n\n\n\n<p>Tensile strength is a measure of the stress a bolt can withstand while being stretched before it is pulled in two. When a fastener such as a bolt has too much load or if it was overtightened, then the bolt can stretch. This is the simplest form of fastener failure, as the bolt or screw fails simply because it&rsquo;s bearing too much weight.<\/p>\n\n\n\n<p>It bears mention that on most engines built since the &lsquo;80s, it has become increasingly common for cylinder head bolts to be designed to stretch for maximum clamping force. These head bolts are torqued to a given foot pound value and then torqued another 90 degrees to provide the required stretch. But they&rsquo;re only supposed to be used once and replaced with new bolts once removed.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>It bears mention that on most engines built since the &lsquo;80s, it has become increasingly common for cylinder head bolts to be designed to stretch for maximum clamping force.<\/p><cite><em>&ndash;&nbsp;<\/em><a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>Tensile overload tends to occur between a bolt&rsquo;s shank and threads. The shank is the portion below the head that doesn&rsquo;t have threading. The telltale signs of tensile overload are cup and cone formations around the break point.<\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><div style=\"clear:both; margin-top:0em; margin-bottom:1em;\"><a href=\"https:\/\/www.carparts.com\/blog\/the-best-tips-for-removing-a-stripped-bolt\/\" target=\"_self\" rel=\"dofollow\" class=\"u78bba2f83a402ec7591b93e030fd1b64\"><style> .u78bba2f83a402ec7591b93e030fd1b64 { padding:0px; margin: 0; padding-top:1em!important; padding-bottom:1em!important; width:100%; display: block; font-weight:bold; background-color:#eaeaea; border:0!important; border-left:4px solid #34495E!important; text-decoration:none; } .u78bba2f83a402ec7591b93e030fd1b64:active, .u78bba2f83a402ec7591b93e030fd1b64:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; text-decoration:none; } .u78bba2f83a402ec7591b93e030fd1b64 { transition: background-color 250ms; webkit-transition: background-color 250ms; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; } .u78bba2f83a402ec7591b93e030fd1b64 .ctaText { font-weight:bold; color:#464646; text-decoration:none; font-size: 16px; } .u78bba2f83a402ec7591b93e030fd1b64 .postTitle { color:#000000; text-decoration: underline!important; font-size: 16px; } .u78bba2f83a402ec7591b93e030fd1b64:hover .postTitle { text-decoration: underline!important; } <\/style><div style=\"padding-left:1em; padding-right:1em;\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">The Best Tips for Removing a Stripped Bolt<\/span><\/div><\/a><\/div><\/div>\n\n\n\n<p>Avoiding mechanical failures because of tensile overload underscores the importance of correct design, as having undersized or misaligned bolts is typically the result of poor planning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Torsional Wear<\/h3>\n\n\n\n<p>The shear failure threshold of a bolt is around half its tensile strength. This means that if it takes 100 pounds of force to pull a bolt apart, then it&rsquo;ll take around half the amount of force to twist it until failure.<\/p>\n\n\n<style>.kadence-column_4a6c9d-bf > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_4a6c9d-bf > .kt-inside-inner-col,.kadence-column_4a6c9d-bf > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_4a6c9d-bf > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_4a6c9d-bf > .kt-inside-inner-col{flex-direction:column;}.kadence-column_4a6c9d-bf > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_4a6c9d-bf > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_4a6c9d-bf{position:relative;}@media all and (max-width: 1024px){.kadence-column_4a6c9d-bf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_4a6c9d-bf > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_4a6c9d-bf kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_6a408c-3b > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_6a408c-3b > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_6a408c-3b > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}#kt-layout-id_6a408c-3b > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_6a408c-3b .kt-row-layout-top-sep{height:100px;}#kt-layout-id_6a408c-3b .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_6a408c-3b .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_6a408c-3b > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_6a408c-3b > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_6a408c-3b .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_6a408c-3b\" class=\"kt-row-layout-inner kt-layout-id_6a408c-3b\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_6a253b-10 > .kt-inside-inner-col{display:flex;}.kadence-column_6a253b-10 > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6a253b-10 > .kt-inside-inner-col,.kadence-column_6a253b-10 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_6a253b-10 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_6a253b-10 > .kt-inside-inner-col > *, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_6a253b-10 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_6a253b-10 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6a253b-10{position:relative;}@media all and (max-width: 1024px){.kadence-column_6a253b-10 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column_6a253b-10 > .kt-inside-inner-col > *, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_6a253b-10 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_6a253b-10 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_6a253b-10 > .kt-inside-inner-col > *, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_6a253b-10 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_6a253b-10 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6a253b-10 kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_84b644-5e.kb-image-is-ratio-size, .kb-image_84b644-5e .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_84b644-5e.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_84b644-5e .kb-image-is-ratio-size{align-self:unset;}.kb-image_84b644-5e figure{max-width:45px;}.kb-image_84b644-5e .image-is-svg, .kb-image_84b644-5e .image-is-svg img{width:100%;}.kb-image_84b644-5e .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_84b644-5e\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column_a6b150-02 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_a6b150-02 > .kt-inside-inner-col,.kadence-column_a6b150-02 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_a6b150-02 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_a6b150-02 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_a6b150-02 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_a6b150-02 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_a6b150-02{position:relative;}@media all and (max-width: 1024px){.kadence-column_a6b150-02 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_a6b150-02 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_a6b150-02 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nBolts are all about clamping force. Lubricating the threads and the underside of the bolt head will tremendously increase clamping force even if the bolt is torqued the same.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<p>Fasteners aren&rsquo;t usually subjected to torsional stress or stress caused by twisting. However, torsional stress can occur in a vehicle driveshaft, input shaft, and output shaft. Misalignment between male and female threads or using the wrong lubricant can also lead to this type of failure.<\/p>\n\n\n<style>.kadence-column_9f7d58-9a > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_9f7d58-9a > .kt-inside-inner-col,.kadence-column_9f7d58-9a > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_9f7d58-9a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_9f7d58-9a > .kt-inside-inner-col{flex-direction:column;}.kadence-column_9f7d58-9a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_9f7d58-9a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_9f7d58-9a{position:relative;}@media all and (max-width: 1024px){.kadence-column_9f7d58-9a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_9f7d58-9a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_9f7d58-9a kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_45e73c-bd > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_45e73c-bd > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_45e73c-bd > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}#kt-layout-id_45e73c-bd > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_45e73c-bd .kt-row-layout-top-sep{height:100px;}#kt-layout-id_45e73c-bd .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_45e73c-bd .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_45e73c-bd > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_45e73c-bd > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_45e73c-bd .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_45e73c-bd\" class=\"kt-row-layout-inner kt-layout-id_45e73c-bd\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_7cafcd-f9 > .kt-inside-inner-col{display:flex;}.kadence-column_7cafcd-f9 > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_7cafcd-f9 > .kt-inside-inner-col,.kadence-column_7cafcd-f9 > 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figure.wp-block-image, .kadence-column_7cafcd-f9 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_7cafcd-f9 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_7cafcd-f9 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_7cafcd-f9 > .kt-inside-inner-col > *, .kadence-column_7cafcd-f9 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_7cafcd-f9 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_7cafcd-f9 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_7cafcd-f9 kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_09f289-8e.kb-image-is-ratio-size, .kb-image_09f289-8e .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_09f289-8e.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_09f289-8e .kb-image-is-ratio-size{align-self:unset;}.kb-image_09f289-8e figure{max-width:45px;}.kb-image_09f289-8e .image-is-svg, .kb-image_09f289-8e .image-is-svg img{width:100%;}.kb-image_09f289-8e .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_09f289-8e\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column_6b9524-f0 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6b9524-f0 > .kt-inside-inner-col,.kadence-column_6b9524-f0 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_6b9524-f0 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6b9524-f0 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6b9524-f0 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6b9524-f0 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6b9524-f0{position:relative;}@media all and (max-width: 1024px){.kadence-column_6b9524-f0 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6b9524-f0 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_6b9524-f0 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nOver-torquing with an impact wrench or a cheater pipe tends to twist bolts to the breaking point, but bolts have different grades, and a lower grade bolt will twist off easier than a higher grade bolt.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts-1024x332.jpg\" alt=\"illustration showing the difference between imperial bolts and metric bolts\" class=\"wp-image-101865\" width=\"1024\" height=\"332\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts-1024x332.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts-300x97.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts-768x249.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts-150x49.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/02\/illustration-showing-the-difference-between-imperial-bolts-and-metric-bolts.jpg 1211w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>&nbsp;Illustration showing the difference between imperial bolts and metric bolts | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Embrittled Metals Because of Leftover Hydrogen<\/h3>\n\n\n\n<p>This is a type of failure that can happen to high-stretch steel alloys such as L-19&reg;, H-11, 300M, and Aeromet. The weakened metal can fail within an hour of torquing the bolt. Fasteners will fail early because there&rsquo;s an existing issue that stems from the electroplating process during production. As water is made up of hydrogen and oxygen, the electricity involved in electroplating can free hydrogen molecules and permeate the steel, which can weaken the bolt.<\/p>\n\n\n\n<p>To prevent hydrogen embrittlement, the hydrogen molecules must be burnt off after electroplating by heating the metal to a certain temperature. The US passed the Fastener Act of 1990, which established manufacturing practices and forced traceability of fasteners to protect the public.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stress Corrosion<\/h3>\n\n\n\n<p>When steel alloys are exposed to moist, corrosive environments, they can develop rust, which can cause cracks. High-strength steel alloys like L-19, H-11, 300M, and Aeromet are prone to stress corrosion, and they must be kept well-oiled and protected from moisture and electrolytes like salt.<\/p>\n\n\n\n<p>This type of failure occurs similarly to hydrogen embrittlement because the fastener head can break off. Unlike hydrogen embrittlement, stress corrosion can take place in the first 24 hours to 2 months after fasteners are torqued.<\/p>\n\n\n\n<p>If you want to avoid stress corrosion and hydrogen embrittlement, you should carefully consider the use of high-strength metals in fasteners.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Cyclic Fatigue<\/h3>\n\n\n\n<p>Cyclic fatigue occurs when a load is constantly applied, removed, and then reapplied on a fastener. While fasteners are built to withstand a set load, they can be weakened if smaller loads are constantly applied, removed, and reapplied. A case where this can occur is if the fastener is improperly installed, as vibration or play can cause cyclic fatigue.<\/p>\n\n\n\n<p>If you want to avoid fastener failure, you have to understand a fastener&rsquo;s weaknesses. So far, their weaknesses include excessive load, cyclic fatigue, corrosion, and torsional stress. Properly preloading bolts are also critical in preventing failures. Engineers and mechanics should always acknowledge the possibility of bolt failure so that they can design structures and parts carefully.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Studs, rivets, bolts, screws, clamps, and pins are examples of fasteners. Without them, many components won&rsquo;t be able to be&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/common-reasons-why-vehicle-fasteners-fail\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":97717,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3743],"tags":[4000,4014,4012,4013,4001],"ppma_author":[2607,2985],"class_list":{"0":"post-97656","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-maintenance","9":"tag-bolt","10":"tag-clamp-set","11":"tag-rivet","12":"tag-screw","13":"tag-stud","14":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Common Reasons Why Vehicle Fasteners Fail - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Fasteners can fail for various reasons. 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