{"id":28246,"date":"2026-09-17T09:09:11","date_gmt":"2026-09-17T12:09:11","guid":{"rendered":"https:\/\/chousa.com.ar\/?p=28246"},"modified":"2026-09-17T11:12:04","modified_gmt":"2026-09-17T14:12:04","slug":"recubrimiento-anticorrosivo-bulones-allen","status":"publish","type":"post","link":"https:\/\/chousa.com.ar\/en\/recubrimiento-anticorrosivo-bulones-allen\/","title":{"rendered":"Anticorrosion Coating for Allen Bolts 8.8, 10.9 and 12.9: Technical Selection Guide"},"content":{"rendered":"<h4 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">In this article:<\/mark><\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong>What are Allen bolts and their strength classes<\/strong><\/mark><\/li>\n\n\n\n<li><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Hydrogen embrittlement in Allen bolts: a factor to consider<\/mark><\/strong><\/li>\n\n\n\n<li><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Laurentcoat\u00ae zinc flake: anticorrosion coating for high-strength Allen bolts<\/mark><\/strong><\/li>\n\n\n\n<li><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Comparative table: electrolytic zinc plating vs zinc flake for Allen bolts<\/mark><\/strong><\/li>\n\n\n\n<li><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Factors to evaluate when choosing the right coating<\/mark><\/strong><\/li>\n\n\n\n<li><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Industrial applications of high-strength Allen bolts<\/mark><\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Allen bolts are fastening elements widely used in industrial applications where mechanical strength, precision and reliability in the joint are required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Their most recognizable feature is the interior hexagonal socket head, which allows high torque values to be transmitted using an Allen key and facilitates assembly in confined spaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These bolts are manufactured in different strength classes \u2014 8.8, 10.9 and 12.9 \u2014 and as mechanical strength increases, the correct selection of the anticorrosion coating for Allen bolts becomes increasingly important.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong>What do classes 8.8, 10.9 and 12.9 mean?<\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The strength class of a bolt identifies its main mechanical properties:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">CLASS<\/mark><\/strong><\/td><td><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">TENSILE STRENGTH<\/mark><\/strong><\/td><\/tr><tr><td>&nbsp;8.8<\/td><td>800 MPa<\/td><\/tr><tr><td>10.9<\/td><td>1.000 MPa<\/td><\/tr><tr><td>12.9<\/td><td>1.200 MPa<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As steel strength increases, other factors that can affect fastener performance must be controlled: corrosion, dimensional tolerances, friction behavior and, especially, the potential risk of hydrogen embrittlement in high-strength Allen bolts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"765\" height=\"1024\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-765x1024.jpg\" alt=\"\" class=\"wp-image-28247\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-765x1024.jpg 765w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-359x480.jpg 359w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-768x1027.jpg 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-1148x1536.jpg 1148w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png-9x12.jpg 9w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen1.png.jpg 1181w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong>Hydrogen embrittlement in Allen bolts: a factor to consider<\/strong><\/mark><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hydrogen embrittlement is a phenomenon that can affect certain high-strength steels when hydrogen atoms enter the microstructure of the material.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the particularities of this phenomenon is that the part may initially pass dimensional and visual inspection and yet subsequently show delayed fracture under load.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, in high-strength Allen bolts \u2014 especially in classes 10.9 and 12.9 \u2014 the selection and control of the anticorrosion coating become especially important.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In electrolytic treatments, certain stages of the process can introduce hydrogen into the material. This does not mean that electrolytic zinc plating cannot be used on high-strength fasteners. There are specific procedures, process controls and hydrogen bake-out treatments designed to minimize this risk. The decision must be made taking into account the characteristics of the part and the requirements of the application.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><strong>Laurentcoat\u00ae zinc flake: anticorrosion coating for high-strength Allen bolts<\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An alternative for certain applications is zinc flake coating.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-1024x683.png\" alt=\"\" class=\"wp-image-28266\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-1024x683.png 1024w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-640x427.png 640w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-768x512.png 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-18x12.png 18w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"wp-block-paragraph\">Unlike electrolytic zinc plating, zinc flake is a non-electrolytic process. Laurentcoat\u00ae allows high-strength Allen bolts to be protected without introducing hydrogen during the application of the anticorrosion coating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Laurentcoat\u00ae is applied using a dip-spin process and thermal curing, achieving typical thicknesses of 5 to 12 microns and reaching up to 1,000 hours of corrosion resistance in salt spray testing per ASTM B117.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The reduced thickness is especially relevant for Allen bolts because it provides high anticorrosion protection while maintaining the dimensional tolerances of the threads \u2014 a critical factor in 10.9 and 12.9 bolts where tolerances are very tight.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><strong><strong>Comparative table: electrolytic zinc plating vs zinc flake for Allen bolts<\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Criterion<\/mark><\/strong><\/td><td><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\">Electrolytic zinc plating<\/mark><\/strong><\/td><td><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong>Zinc flake Laurentcoat\u00ae<\/strong><\/mark><\/strong><\/td><\/tr><tr><td>Process<\/td><td>Electrolytic<\/td><td>Non-electrolytic<\/td><\/tr><tr><td>Corrosion resistance (NSS)<\/td><td>Up to 96 hrs<\/td><td>Up to 1,000 hrs<\/td><\/tr><tr><td>Hydrogen embrittlement risk<\/td><td>Present \u2014 requires bake-out<\/td><td>No risk<\/td><\/tr><tr><td>Dimensional Tolerances<\/td><td>May affect threads<\/td><td>Does not alter tolerances<\/td><\/tr><tr><td>Reference Standards<\/td><td>ASTM B633<\/td><td>ASTM F1136 \/ ISO 10683<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><strong><strong><strong>Electrolytic zinc plating or zinc flake for high-strength Allen bolts?<\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There is no universal anticorrosion coating for all Allen bolts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Electrolytic zinc plating remains a widely used and efficient solution for numerous industrial applications. Zinc flake, on the other hand, becomes especially relevant when high corrosion resistance requirements are combined with high-strength steels \u2014 such as Allen bolts 10.9 and 12.9 \u2014 and the need to avoid hydrogen incorporation during the coating process.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1774\" height=\"634\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited.png\" alt=\"Bulones Allen de alta resistencia con recubrimiento de zinc laminar Laurentcoat\u00ae\" class=\"wp-image-28257\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited.png 1774w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited-640x229.png 640w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited-1024x366.png 1024w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited-768x274.png 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited-1536x549.png 1536w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen-de-alta-resistencia-con-recubrimiento-de-zinc-laminar-Laurentcoat\u00ae-edited-18x6.png 18w\" sizes=\"(max-width: 1774px) 100vw, 1774px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The selection of the anticorrosion coating for Allen bolts should not be made solely based on salt spray hours. The following factors must also be analyzed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Bolt strength class and hardness<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Environmental working conditions<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Torque and friction requirements<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Dimensional Tolerances<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Part geometry<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-black-color\">Applicable standards and specifications<\/mark><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><strong><strong><strong><strong>Industrial applications of high-strength Allen bolts<\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">High-strength Allen bolts can be found in a wide variety of sectors, including agricultural machinery, automotive, mining, Oil &amp; Gas, structures and industrial equipment.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-1024x608.jpg\" alt=\"Bulones Allen de alta resistencia con recubrimiento de zinc laminar Laurentcoat\u00ae\" class=\"wp-image-28252\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-1024x608.jpg 1024w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-640x380.jpg 640w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-768x456.jpg 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-1536x912.jpg 1536w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-2048x1216.jpg 2048w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Bulones-Allen4-18x12.jpg 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"wp-block-paragraph\">Operating conditions can vary greatly between applications. Therefore, even using the same type of Allen bolt, the appropriate anticorrosion coating may change depending on the environment where the part will operate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At Chousa we work with different surface protection technologies, including electrolytic zinc plating, zinc-nickel and Laurentcoat\u00ae zinc flake, evaluating each application to determine the most suitable alternative. Because the goal is not simply to protect an Allen bolt against corrosion, but to ensure that the anticorrosion coating supports the performance for which the part was designed.<\/p>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-green-cyan-color\"><strong><strong><strong><strong><strong><strong>Do you work with high-strength Allen bolts and need to evaluate the correct anticorrosion coating for your application?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can contact us at <strong><a href=\"mailto:info@chousa.com.ar\">info@chousa.com.ar<\/a><\/strong> and connect with our technical team.<\/p>","protected":false},"excerpt":{"rendered":"<p>Allen bolts are fastening elements widely used in industrial applications where mechanical strength, precision and reliability in the joint are required.<br \/>\nTheir most recognizable feature is the interior hexagonal socket head, which allows high torque values to be transmitted using an Allen key and facilitates assembly in confined spaces.<\/p>","protected":false},"author":3,"featured_media":28263,"comment_status":"closed","ping_status":"close","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[59],"tags":[],"class_list":["post-28246","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laurentcoat"],"acf":[],"_links":{"self":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28246","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/comments?post=28246"}],"version-history":[{"count":13,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28246\/revisions"}],"predecessor-version":[{"id":28268,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28246\/revisions\/28268"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/media\/28263"}],"wp:attachment":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/media?parent=28246"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/categories?post=28246"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/tags?post=28246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}