{"id":2123,"date":"2026-06-11T14:00:00","date_gmt":"2026-06-11T12:00:00","guid":{"rendered":"https:\/\/www.vis-express.fr\/blog\/?p=2123"},"modified":"2026-06-04T15:42:24","modified_gmt":"2026-06-04T13:42:24","slug":"vis-8-8-10-9-et-12-9-comment-choisir-la-bonne-classe-mecanique","status":"publish","type":"post","link":"https:\/\/www.vis-express.fr\/blog\/vis-8-8-10-9-et-12-9-comment-choisir-la-bonne-classe-mecanique\/","title":{"rendered":"Vis 8.8, 10.9 et 12.9 : comment choisir la bonne classe m\u00e9canique ?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>Les chiffres 8.8, 10.9 ou 12.9 indiquent : la classe m\u00e9canique d\u2019une vis.<\/p>\n\n\n\n<p>Cette classe d\u00e9finit :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la r\u00e9sistance m\u00e9canique<\/li>\n\n\n\n<li>la capacit\u00e9 de serrage<\/li>\n\n\n\n<li>la r\u00e9sistance \u00e0 la traction<\/li>\n\n\n\n<li>les applications compatibles<\/li>\n<\/ul>\n\n\n\n<p>Choisir une mauvaise classe peut entra\u00eener :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>rupture<\/li>\n\n\n\n<li>d\u00e9formation<\/li>\n\n\n\n<li>desserrage<\/li>\n\n\n\n<li>fatigue m\u00e9canique<\/li>\n\n\n\n<li>d\u00e9faillance structurelle<\/li>\n<\/ul>\n\n\n\n<p>Dans ce guide, Vis Express vous explique les diff\u00e9rences entre les vis 8.8, 10.9 et 12.9 et comment choisir la bonne fixation selon votre application.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Que signifie la classe m\u00e9canique d\u2019une vis ?<\/h2>\n\n\n\n<p>Les classes m\u00e9caniques suivent une norme internationale.<\/p>\n\n\n\n<p>Exemples :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>6.8<\/li>\n\n\n\n<li>8.8<\/li>\n\n\n\n<li>10.9<\/li>\n\n\n\n<li>12.9<\/li>\n<\/ul>\n\n\n\n<p>Plus le chiffre est \u00e9lev\u00e9 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>plus la vis est r\u00e9sistante<\/li>\n\n\n\n<li>plus elle supporte des charges importantes<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comprendre les chiffres 8.8, 10.9 et 12.9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Classe 8.8<\/h3>\n\n\n\n<p>La vis 8.8 est la plus utilis\u00e9e dans :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>le b\u00e2timent<\/li>\n\n\n\n<li>la charpente m\u00e9tallique<\/li>\n\n\n\n<li>l\u2019industrie g\u00e9n\u00e9rale<\/li>\n\n\n\n<li>les assemblages courants<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Avantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;polyvalente<\/li>\n\n\n\n<li>bon rapport r\u00e9sistance\/prix<\/li>\n\n\n\n<li>tr\u00e8s r\u00e9pandue<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>structures m\u00e9talliques<\/li>\n\n\n\n<li>assemblages m\u00e9caniques<\/li>\n\n\n\n<li>machines<\/li>\n\n\n\n<li>maintenance<\/li>\n\n\n\n<li>fixation industrielle<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Classe 10.9<\/h3>\n\n\n\n<p>La<strong> <a href=\"https:\/\/www.vis-express.fr\/s\/5011\/vis-classe-10-9\">classe 10.9<\/a> <\/strong>offre : <strong>une r\u00e9sistance sup\u00e9rieur \u00e0 la 8.8<\/strong><\/p>\n\n\n\n<p>Elle est utilis\u00e9e pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fortes contraintes m\u00e9caniques<\/li>\n\n\n\n<li>machines industrielles<\/li>\n\n\n\n<li>automobile<\/li>\n\n\n\n<li>\u00e9quipements soumis aux vibrations<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Avantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;haute r\u00e9sistance<\/li>\n\n\n\n<li>meilleure tenue m\u00e9canique<\/li>\n\n\n\n<li>&nbsp;adapt\u00e9e aux fortes charges<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>m\u00e9canique industrielle<\/li>\n\n\n\n<li>automobile<\/li>\n\n\n\n<li>engins<\/li>\n\n\n\n<li>structures fortement sollicit\u00e9es<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Classe 12.9<\/h3>\n\n\n\n<p>La classe 12.9 est : <strong>une tr\u00e8s haute r\u00e9sistance m\u00e9canique<\/strong><\/p>\n\n\n\n<p>Elle est utilis\u00e9e dans :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>m\u00e9canique lourde<\/li>\n\n\n\n<li>applications techniques exigeantes<\/li>\n\n\n\n<li>assemblages tr\u00e8s sollicit\u00e9s<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Avantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;r\u00e9sistance maximale<\/li>\n\n\n\n<li>&nbsp;tr\u00e8s forte capacit\u00e9 de serrage<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Attention<\/h3>\n\n\n\n<p>Les vis 12.9 sont :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>plus dures<\/li>\n\n\n\n<li>parfois plus sensibles \u00e0 certaines contraintes de fatigue ou corrosion<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Tableau comparatif 8.8 vs 10.9 vs 12.9<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Classe<\/th><th>R\u00e9sistance<\/th><th>Usage principal<\/th><\/tr><\/thead><tbody><tr><td>8.8<\/td><td>standard renforc\u00e9<\/td><td>b\u00e2timent, industrie g\u00e9n\u00e9rale<\/td><\/tr><tr><td>10.9<\/td><td>haute r\u00e9sistance<\/td><td>m\u00e9canique, automobile<\/td><\/tr><tr><td>12.9<\/td><td>tr\u00e8s haute r\u00e9sistance<\/td><td>m\u00e9canique lourde<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sistance m\u00e9canique des vis<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">Plus la classe est \u00e9lev\u00e9e :<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>plus la limite \u00e9lastique augmente<\/li>\n\n\n\n<li>plus la r\u00e9sistance \u00e0 la traction augmente<\/li>\n<\/ul>\n\n\n\n<p>Cela permet :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>un serrage plus important<\/li>\n\n\n\n<li>une meilleure reprise des charges<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Quelle classe choisir selon l\u2019application ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. B\u00e2timent et assemblages courants<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Recommandation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;<a href=\"https:\/\/www.vis-express.fr\/s\/5012\/vis-classe-8-8\"><strong>vis 8.8<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<p>Suffisante pour la majorit\u00e9 des usages standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Machines et \u00e9quipements soumis aux vibrations<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Recommandation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>vis 10.9<\/li>\n<\/ul>\n\n\n\n<p>Meilleure r\u00e9sistance m\u00e9canique et meilleure tenue sous contraintes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Applications fortement sollicit\u00e9es<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Recommandation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;vis 12.9<\/li>\n<\/ul>\n\n\n\n<p>Pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>efforts tr\u00e8s \u00e9lev\u00e9s<\/li>\n\n\n\n<li>contraintes m\u00e9caniques importantes<\/li>\n\n\n\n<li>assemblages techniques<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Attention au couple de serrage<\/h2>\n\n\n\n<p>Une vis haute r\u00e9sistance n\u00e9cessite : un serrage adapt\u00e9<\/p>\n\n\n\n<p>Un mauvais couple peut provoquer :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>rupture<\/li>\n\n\n\n<li>fatigue m\u00e9canique<\/li>\n\n\n\n<li>desserrage<\/li>\n<\/ul>\n\n\n\n<p>Outil utile<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Calculateur de couple de serrage Vis Express<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Faut-il choisir syst\u00e9matiquement la classe la plus \u00e9lev\u00e9e ?<\/h2>\n\n\n\n<p>Non.<\/p>\n\n\n\n<p>Une <strong><a href=\"https:\/\/www.vis-express.fr\/s\/5013\/vis-classe-12-9\">vis 12.9<\/a><\/strong> n\u2019est pas toujours meilleure qu\u2019une 8.8.<\/p>\n\n\n\n<p>Le choix d\u00e9pend :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>des charges<\/li>\n\n\n\n<li>du mat\u00e9riau<\/li>\n\n\n\n<li>des vibrations<\/li>\n\n\n\n<li>de l\u2019environnement<\/li>\n\n\n\n<li>du co\u00fbt<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Attention \u00e0 la corrosion<\/h3>\n\n\n\n<p>Les vis haute r\u00e9sistance :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>n\u00e9cessitent parfois des traitements adapt\u00e9s<\/li>\n\n\n\n<li>peuvent \u00eatre sensibles dans certains environnements<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">En ext\u00e9rieur<\/h3>\n\n\n\n<p>Il faut v\u00e9rifier :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>zingage<\/li>\n\n\n\n<li>rev\u00eatement<\/li>\n\n\n\n<li>inox<\/li>\n\n\n\n<li>protection anticorrosion<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c0 lire aussi<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Diff\u00e9rence inox A2 et A4<\/li>\n\n\n\n<li>Corrosion galvanique<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Classe m\u00e9canique et inox<\/h2>\n\n\n\n<p>Les classes 8.8, 10.9 et 12.9 concernent principalement : les vis acier<\/p>\n\n\n\n<p>L\u2019inox suit d\u2019autres classifications :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A2-70<\/li>\n\n\n\n<li>A4-80<\/li>\n\n\n\n<li>etc.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Erreurs fr\u00e9quentes<\/h2>\n\n\n\n<p><strong>Sous-dimensionner la classe<\/strong><\/p>\n\n\n\n<p>\u2192 risque de rupture<\/p>\n\n\n\n<p><strong>Surdimensionner inutilement<\/strong><\/p>\n\n\n\n<p>\u2192 co\u00fbt plus \u00e9lev\u00e9<\/p>\n\n\n\n<p><strong>Mauvais couple de serrage<\/strong><\/p>\n\n\n\n<p>\u2192 fatigue m\u00e9canique<\/p>\n\n\n\n<p><strong>Mauvais environnement<\/strong><\/p>\n\n\n\n<p>\u2192 corrosion pr\u00e9matur\u00e9e<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommandations Vis Express<\/h2>\n\n\n\n<p>Pour choisir la bonne classe m\u00e9canique :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;analyser les charges<\/li>\n\n\n\n<li>v\u00e9rifier les contraintes m\u00e9caniques<\/li>\n\n\n\n<li>adapter le couple de serrage<\/li>\n\n\n\n<li>choisir le bon traitement anticorrosion<\/li>\n\n\n\n<li>respecter les normes constructeur<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Produits recommand\u00e9s<\/h2>\n\n\n\n<p><strong>Vis classe 8.8<\/strong><\/p>\n\n\n\n<p>Assemblages standards industriels et b\u00e2timent.<\/p>\n\n\n\n<p><strong>Vis classe 10.9<\/strong><\/p>\n\n\n\n<p>Applications m\u00e9caniques renforc\u00e9es.<\/p>\n\n\n\n<p><strong>Vis classe 12.9<\/strong><\/p>\n\n\n\n<p>Tr\u00e8s fortes contraintes m\u00e9caniques.<\/p>\n\n\n\n<p><strong>Rondelles et \u00e9crous haute r\u00e9sistance<\/strong><\/p>\n\n\n\n<p>Pour assemblages s\u00e9curis\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kits fixation industrielle Vis Express<\/h2>\n\n\n\n<p>D\u00e9couvrez nos :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>kits fixation m\u00e9canique<\/li>\n\n\n\n<li>visserie haute r\u00e9sistance<\/li>\n\n\n\n<li>solutions industrie<\/li>\n\n\n\n<li>assemblages techniques professionnels<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Les classes m\u00e9caniques 8.8, 10.9 et 12.9 permettent d\u2019adapter la visserie :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>aux charges<\/li>\n\n\n\n<li>aux contraintes<\/li>\n\n\n\n<li>\u00e0 l\u2019environnement<\/li>\n\n\n\n<li>au niveau de s\u00e9curit\u00e9 requis<\/li>\n<\/ul>\n\n\n\n<p>Le bon choix am\u00e9liore :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la s\u00e9curit\u00e9<\/li>\n\n\n\n<li>la dur\u00e9e de vie<\/li>\n\n\n\n<li>la fiabilit\u00e9 des assemblages<\/li>\n<\/ul>\n\n\n\n<p>Chez <a href=\"https:\/\/www.vis-express.fr\/\"><strong>Vis Express<\/strong><\/a>, nous proposons :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>vis haute r\u00e9sistance<\/li>\n\n\n\n<li>fixation industrielle<\/li>\n\n\n\n<li>classes m\u00e9caniques certifi\u00e9es<\/li>\n\n\n\n<li>prix d\u00e9gressifs<\/li>\n\n\n\n<li>stock important<\/li>\n\n\n\n<li>livraison rapide<\/li>\n<\/ul>\n\n\n\n<p>Si vous avez aim\u00e9 cet article, vous aimerez peut-\u00eatre aussi notre article qui traite \u00ab&nbsp;<strong><a href=\"https:\/\/www.vis-express.fr\/blog\/vis-choisir-travaux\/\">Quelle vis choisir pour ses travaux ?<\/a>&nbsp;<\/strong>\u00bb<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Introduction Les chiffres 8.8, 10.9 ou 12.9 indiquent : la classe m\u00e9canique d\u2019une vis. Cette classe d\u00e9finit : Choisir une mauvaise classe peut entra\u00eener : Dans ce guide, Vis Express vous explique les diff\u00e9rences entre <a class=\"mh-excerpt-more\" href=\"https:\/\/www.vis-express.fr\/blog\/vis-8-8-10-9-et-12-9-comment-choisir-la-bonne-classe-mecanique\/\" title=\"Vis 8.8, 10.9 et 12.9 : comment choisir la bonne classe m\u00e9canique ?\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":7,"featured_media":2124,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[113,114,112],"class_list":["post-2123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide-de-choix","tag-vis-classe-10-9","tag-vis-classe-12-9","tag-vis-classe-8-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vis 8.8, 10.9 et 12.9 : comment choisir la bonne classe m\u00e9canique ? - Blog - Vis-Express : Tout savoir sur la visserie et les fixations<\/title>\n<meta name=\"description\" content=\"Tout savoir sur les diff\u00e9rences entre les vis 8.8, 10.9 et 12.9. 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