{"id":28328,"date":"2026-10-20T09:26:49","date_gmt":"2026-10-20T12:26:49","guid":{"rendered":"https:\/\/chousa.com.ar\/?p=28328"},"modified":"2026-10-20T09:26:52","modified_gmt":"2026-10-20T12:26:52","slug":"galvanizado-caliente-buloneria-repaso-rosca","status":"publish","type":"post","link":"https:\/\/chousa.com.ar\/en\/galvanizado-caliente-buloneria-repaso-rosca\/","title":{"rendered":"Hot-Dip Galvanizing and Fasteners: Why Thread Chasing Destroys Corrosion Protection"},"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 is thread chasing and why does it occur<\/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\">Why thread chasing increases the cost of galvanized fasteners<\/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\">Where this problem appears in industry<\/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\">Zinc flake: the alternative for fasteners<\/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\">Hot-dip galvanizing and zinc flake don\u2019t compete \u2014 they complement each other<\/mark><\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Hot-dip galvanizing is robust, cost-effective, and proven for large structural surfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But when that same specification criterion is applied to fasteners, a problem appears that few anticipate \u2014 and whose cost only becomes apparent later.<\/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><strong>What is thread chasing and why does it occur<\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The hot-dip galvanizing process submerges parts in molten zinc at approximately 450\u00b0C. The result is a coating between 45 and 85 microns thick. For a beam or a column, that thickness is not a problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a bolt or a nut, it is.<\/p>\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-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1214\" height=\"1092\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1.png\" alt=\"\" class=\"wp-image-28330\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1.png 1214w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1-534x480.png 534w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1-1024x921.png 1024w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1-768x691.png 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria1-13x12.png 13w\" sizes=\"(max-width: 1214px) 100vw, 1214px\" \/><\/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\">A standard metric thread has dimensional tolerances of between 20 and 30 microns. The hot-dip galvanizing coating practically doubles that margin. The direct consequence: the nut won\u2019t fit. Or it fits with so much friction that assembly becomes impractical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The solution applied in the plant is thread chasing: running a tap or die to recover the dimensional tolerance and allow assembly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The problem is what gets lost in that process.<\/p>\n<\/div>\n<\/div>\n\n\n\n<ul class=\"wp-block-list\"><\/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>Why thread chasing increases the cost of galvanized fasteners<\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thread chasing is not just an additional operation. It is an operation that damages the coating that was just applied.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cWhen the thread is chased, part of the zinc is removed from the contact zones \u2014 exactly where the component will be subjected to the greatest friction, moisture, and load.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The other alternative used in industry is to manufacture parts with oversized tolerances to account for the galvanizing thickness \u2014 but that comes with its own cost: modifying the original dimensions of the bolt can compromise its mechanical properties and behavior under load.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In either case, the costs that accumulate are not always accounted for in the original specification:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Additional plant operation time<\/li>\n\n\n\n<li>Thread chasing tools and their maintenance<\/li>\n\n\n\n<li>Risk of thread damage if chasing is not precise<\/li>\n\n\n\n<li>Higher in-service failure rate due to uncoated zones or compromised mechanical properties<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A part that seemed more economical at the purchasing stage may end up being more expensive over its service life.<\/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><strong><strong><strong>Where this problem appears in industry<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thread chasing on galvanized fasteners is common in projects where hot-dip galvanizing is specified for the entire structure:<\/p>\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-full\"><img decoding=\"async\" width=\"1352\" height=\"896\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3.png\" alt=\"\" class=\"wp-image-28332\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3.png 1352w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3-640x424.png 640w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3-1024x679.png 1024w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3-768x509.png 768w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria3-18x12.png 18w\" sizes=\"(max-width: 1352px) 100vw, 1352px\" \/><\/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<ul class=\"wp-block-list\">\n<li>Metal structures for mining, construction, and oil &amp; gas<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Supports and structures for solar panels<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Electrical transmission towers and transformer hardware<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Road and transport infrastructure<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">In all these cases, the volume of fasteners is significant. Thread chasing, multiplied across thousands of parts, stops being a minor detail and becomes a process problem with a direct impact on costs and quality.<\/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><strong><strong><strong><strong>Zinc flake: the alternative for fasteners<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\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-full\"><img decoding=\"async\" width=\"524\" height=\"456\" src=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria4.png\" alt=\"\" class=\"wp-image-28333\" srcset=\"https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria4.png 524w, https:\/\/chousa.com.ar\/wp-content\/uploads\/Galvanizado-en-caliente-y-buloneria4-14x12.png 14w\" sizes=\"(max-width: 524px) 100vw, 524px\" \/><\/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\">Zinc flake is applied by dip-spin: the part is submerged in the solution and centrifuged to distribute the coating uniformly. The resulting thickness is between 5 and 12 microns \u2014 within the dimensional tolerances of any standard thread.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No thread chasing. No coating removal. No unprotected zones from day one.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In terms of corrosion protection, LAURENTCOAT\u00ae zinc flake reaches up to 1,000 hours in salt spray testing per ASTM B117 \u2014 equal to or greater than hot-dip galvanizing on fastening components.<\/p>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Characteristic<\/strong><\/td><td><strong><strong>Hot-Dip Galvanizing<\/strong><\/strong><\/td><td><strong>Zinc flake LAURENTCOAT\u00ae<\/strong><\/td><\/tr><tr><td>Coating thickness<\/td><td>45\u201385 microns<\/td><td>5\u201312 microns<\/td><\/tr><tr><td>Compatible with thread tolerances<\/td><td>No \u2014 requires chasing<\/td><td>Yes \u2014 no chasing needed<\/td><\/tr><tr><td>Coating removal during assembly<\/td><td>Yes<\/td><td>No<\/td><\/tr><tr><td>Salt spray resistance (ASTM B117)<\/td><td>500\u2013700 hrs<\/td><td>Up to 1,000 hrs<\/td><\/tr><tr><td>Recommended application<\/td><td>Structures, profiles, beams<\/td><td>Fasteners, bolts, nuts, hardware<\/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><strong><strong><strong><strong>Hot-dip galvanizing and zinc flake don\u2019t compete \u2014 they complement each other<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/mark><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The correct specification is not about choosing one over the other. It\u2019s about understanding what each treatment does well and applying it where it makes sense.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hot-dip galvanizing<\/strong> for the structure: beams, columns, profiles<\/li>\n\n\n\n<li><strong>Zinc flake<\/strong> for fasteners: bolts, nuts, studs, fixing hardware<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each treatment in its place. Complete system protection. No additional operations and no weak points in the final assembly.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">In CHOUSA we have over 65 years of experience applying surface treatments for industry. <strong>CHOUSA <\/strong>llevamos m\u00e1s de 65 a\u00f1os aplicando tratamientos superficiales para la industria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are specifying fasteners for a galvanized structure and want to evaluate the right treatment, you can contact our technical team at <strong><a href=\"mailto:info@chousa.com.ar\">info@chousa.com.ar<\/a><\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hot-dip galvanizing is robust, cost-effective, and proven for large structural surfaces. But when that same specification criterion is applied to fasteners, a problem appears that few anticipate \u2014 and whose cost only becomes apparent later.<\/p>","protected":false},"author":3,"featured_media":28329,"comment_status":"closed","ping_status":"close","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[69],"tags":[],"class_list":["post-28328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"acf":[],"_links":{"self":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28328","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=28328"}],"version-history":[{"count":2,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28328\/revisions"}],"predecessor-version":[{"id":28334,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/posts\/28328\/revisions\/28334"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/media\/28329"}],"wp:attachment":[{"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/media?parent=28328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/categories?post=28328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chousa.com.ar\/en\/wp-json\/wp\/v2\/tags?post=28328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}