{"id":8782,"date":"2021-02-11T21:30:24","date_gmt":"2021-02-11T13:30:24","guid":{"rendered":"https:\/\/xzfastener.com\/?p=8782"},"modified":"2026-06-29T21:32:23","modified_gmt":"2026-06-29T13:32:23","slug":"bolt-diameter-guide-nominal-size-shank-size-and-thread-size","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/fr\/bolt-diameter-guide-nominal-size-shank-size-and-thread-size\/","title":{"rendered":"Guide des diam\u00e8tres de boulons\u00a0: taille nominale, taille de tige et taille de filetage"},"content":{"rendered":"<p>Bolt diameter looks simple until an RFQ, drawing, and actual part do not match. A buyer may write \u201cM12 bolt,\u201d but the supplier still needs to know the standard, thread pitch, shank style, tolerance, and whether the bolt is fully threaded or partially threaded.<\/p>\n\n\n\n<p>For industrial purchasing, diameter is not one number. It is a set of related dimensions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Three Diameter Terms Buyers Should Know<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Dur\u00e9e<\/th><th>Signification<\/th><th>Pourquoi c'est important<\/th><\/tr><\/thead><tbody><tr><td>Taille nominale<\/td><td>The named bolt size, such as M12 or 1\/2 inch<\/td><td>Used for RFQs, catalogs, and standard selection<\/td><\/tr><tr><td>Shank size<\/td><td>The unthreaded body diameter under the head<\/td><td>Affects fit through holes and shear area<\/td><\/tr><tr><td>Taille du fil<\/td><td>The thread diameter and pitch, such as M12 x 1.75 or 1\/2-13 UNC<\/td><td>Controls nut fit, thread engagement, and compatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Pour les articles courants du catalogue, les acheteurs peuvent consulter <a href=\"https:\/\/xzfastener.com\/fr\/products-category\/standard-fasteners\/\">attaches standards<\/a> et confirmez la norme exacte avant de commander.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nominal Diameter Is a Name, Not Always the Measured Value<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Metric Bolts<\/h3>\n\n\n\n<p>For metric bolts, \u201cM12\u201d means the nominal thread diameter is 12 mm. The actual outside diameter of the thread is usually slightly below 12 mm because of manufacturing tolerances.<\/p>\n\n\n\n<p>A typical metric callout may be:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M12 x 1.75 x 60 mm<\/li>\n\n\n\n<li>M12 = nominal thread diameter<\/li>\n\n\n\n<li>1.75 = thread pitch in millimeters<\/li>\n\n\n\n<li>60 mm = bolt length<\/li>\n<\/ul>\n\n\n\n<p>For metric standard comparison, this <a href=\"https:\/\/xzfastener.com\/fr\/din-iso-fastener-standards-complete-overview-for-industrial-buyers\/\">Guide des normes de fixation DIN et ISO<\/a> helps buyers avoid confusing similar standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inch Bolts<\/h3>\n\n\n\n<p>For inch fasteners, a size such as 1\/2-13 UNC means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1\/2 inch = nominal diameter<\/li>\n\n\n\n<li>13 = threads per inch<\/li>\n\n\n\n<li>UNC = Unified coarse thread<\/li>\n<\/ul>\n\n\n\n<p>UNF threads use more threads per inch and are not interchangeable with UNC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Shank Diameter and Hole Fit<\/h2>\n\n\n\n<p>The shank is the unthreaded portion of a partially threaded bolt. It may be close to the nominal diameter, but the exact tolerance depends on the standard and product type.<\/p>\n\n\n\n<p>Shank size matters when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The bolt passes through precision holes.<\/li>\n\n\n\n<li>The joint carries shear load.<\/li>\n\n\n\n<li>The assembly needs alignment.<\/li>\n\n\n\n<li>The drawing requires a shoulder or close body fit.<\/li>\n<\/ul>\n\n\n\n<p>Do not assume a fully threaded bolt and a partially threaded bolt will behave the same in a shear joint.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thread Diameter and Pitch<\/h2>\n\n\n\n<p>Thread size controls assembly with nuts or tapped holes. A bolt with the correct nominal diameter but wrong pitch will not fit.<\/p>\n\n\n\n<p>Les acheteurs doivent confirmer\u00a0:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Filetage m\u00e9trique ou inch.<\/li>\n\n\n\n<li>Coarse or fine pitch.<\/li>\n\n\n\n<li>Filetage complet ou filetage partiel.<\/li>\n\n\n\n<li>Thread tolerance class.<\/li>\n\n\n\n<li>Matching nut standard.<\/li>\n\n\n\n<li>Coating effect on thread fit.<\/li>\n<\/ol>\n\n\n\n<p>For coated parts, confirm thread fit after finishing, especially for hot-dip galvanized fasteners.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Liste de contr\u00f4le de la demande de prix<\/h2>\n\n\n\n<p>Avant de demander un devis, fournissez :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Standard or drawing.<\/li>\n\n\n\n<li>Nominal size.<\/li>\n\n\n\n<li>Length.<\/li>\n\n\n\n<li>Thread pitch.<\/li>\n\n\n\n<li>Filetage complet ou filetage partiel.<\/li>\n\n\n\n<li>Shank requirement.<\/li>\n\n\n\n<li>Grade and material.<\/li>\n\n\n\n<li>Finish.<\/li>\n\n\n\n<li>Quantity and inspection needs.<\/li>\n<\/ul>\n\n\n\n<p>For mixed bolt, nut, and washer orders, buyers can <a href=\"https:\/\/xzfastener.com\/fr\/home\/contact-us\/\">contacter XZ Fastener<\/a> with drawings or size lists to reduce diameter and thread specification errors.<\/p>","protected":false},"excerpt":{"rendered":"<p>Bolt diameter looks simple until an RFQ, drawing, and actual part do not match. A buyer may write \u201cM12 bolt,\u201d but the supplier still needs to know the standard, thread pitch, shank style, tolerance, and whether the bolt is fully threaded or partially threaded. For industrial purchasing, diameter is not one number. It is a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[479],"tags":[482],"class_list":["post-8782","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library","tag-fastener-sizes-specifications"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/posts\/8782","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/comments?post=8782"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/posts\/8782\/revisions"}],"predecessor-version":[{"id":8783,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/posts\/8782\/revisions\/8783"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/media?parent=8782"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/categories?post=8782"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/fr\/wp-json\/wp\/v2\/tags?post=8782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}