{"id":5431,"date":"2026-08-14T08:53:01","date_gmt":"2026-08-14T08:53:01","guid":{"rendered":"https:\/\/beiyutitanium.com\/titanium-bar-diameter-tolerance-how-to-specify\/"},"modified":"2026-08-15T01:47:35","modified_gmt":"2026-08-15T01:47:35","slug":"titanium-bar-diameter-tolerance-how-to-specify","status":"publish","type":"post","link":"https:\/\/beiyutitanium.com\/fr\/titanium-bar-diameter-tolerance-how-to-specify\/","title":{"rendered":"Tol\u00e9rance de diam\u00e8tre des barres en titane : valeur ou classe ISO"},"content":{"rendered":"<figure class=\"ti-hero-image\" style=\"margin:0 0 1.2em;\"><img decoding=\"async\" src=\"https:\/\/beiyutitanium.com\/wp-content\/uploads\/2026\/08\/titanium-bar-diameter-measurement.jpg\" alt=\"Digital micrometer reading titanium bar diameter on a granite surface plate\" loading=\"eager\" style=\"width:100%;height:auto;border-radius:8px;\" \/><\/figure>\n<h2>Une tol\u00e9rance n'est pas un chiffre unique pour toute la gamme de barres<\/h2>\n<p>La tol\u00e9rance de diam\u00e8tre d\u00e9pend <a href=\"https:\/\/beiyutitanium.com\/fr\/titanium-bar-peeled-turned-or-ground\/\">de la finition de la barre<\/a> et du diam\u00e8tre lui-m\u00eame. Demander une valeur unique sur une plage de dimensions produit g\u00e9n\u00e9ralement une offre qui ne signifie pas ce que l'acheteur pensait qu'elle signifiait.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ce qui modifie la tol\u00e9rance r\u00e9alisable<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L'\u00e9tat de surface auquel la barre est finie<\/td>\n<\/tr>\n<tr>\n<td>Le diam\u00e8tre command\u00e9<\/td>\n<\/tr>\n<tr>\n<td>Si la valeur est requise pour chaque barre ou comme moyenne de lot<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Ce que Beiyu respecte sur la fili\u00e8re de rectification de pr\u00e9cision<\/h2>\n<table>\n<thead>\n<tr>\n<th>Exigence<\/th>\n<th>Tol\u00e9rance de diam\u00e8tre<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Barre standard rectifi\u00e9e sans centre de pr\u00e9cision<\/td>\n<td>Plus ou moins 0,0127 mm<\/td>\n<\/tr>\n<tr>\n<td>Resserr\u00e9e, lorsque le plan l'exige<\/td>\n<td>Plus ou moins 0,0076 mm<\/td>\n<\/tr>\n<tr>\n<td>Barre pel\u00e9e ou tourn\u00e9e<\/td>\n<td>Selon le tableau des tol\u00e9rances de la norme command\u00e9e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>La valeur resserr\u00e9e est d\u00e9finie par rapport au plan plut\u00f4t que propos\u00e9e comme capacit\u00e9 g\u00e9n\u00e9rale, et elle est confirm\u00e9e pour le diam\u00e8tre command\u00e9 avant chiffrage.<\/p>\n<h2>Les classes ISO h et les valeurs plus ou moins sont des langages diff\u00e9rents<\/h2>\n<p>Les plans d'usinage indiquent souvent une classe de tol\u00e9rance ISO, tandis que les lignes de commande de l'usine indiquent souvent une valeur plus ou moins. Elles ne sont pas interchangeables, car une classe ISO d\u00e9pend du diam\u00e8tre et une valeur plus ou moins n'en d\u00e9pend pas.<\/p>\n<table>\n<thead>\n<tr>\n<th>Mode d'indication<\/th>\n<th>Ce que cela implique<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Classe ISO h<\/td>\n<td>La plage admissible varie selon le diam\u00e8tre nominal<\/td>\n<\/tr>\n<tr>\n<td>Valeur plus ou moins<\/td>\n<td>La m\u00eame plage pour chaque diam\u00e8tre de la commande<\/td>\n<\/tr>\n<tr>\n<td>Classe sans dimension nominale<\/td>\n<td>Ne peut pas \u00eatre convertie en limite d'usinage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>La tol\u00e9rance de diam\u00e8tre est mesur\u00e9e, non suppos\u00e9e<\/h2>\n<p>Le diam\u00e8tre est mesur\u00e9 par laser infrarouge sur chaque pi\u00e8ce sortant du parcours de rectification de pr\u00e9cision, ce qui permet de consid\u00e9rer la plage comme un crit\u00e8re d'acceptation plut\u00f4t que comme une cible.<\/p>\n<table>\n<thead>\n<tr>\n<th>Contr\u00f4le \u00e0 100 pour cent sur ce parcours<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u00e9tection de d\u00e9fauts par ultrasons<\/td>\n<\/tr>\n<tr>\n<td>D\u00e9tection de d\u00e9fauts par courants de Foucault<\/td>\n<\/tr>\n<tr>\n<td>Contr\u00f4le optique de surface<\/td>\n<\/tr>\n<tr>\n<td>Mesure du diam\u00e8tre par laser infrarouge<\/td>\n<\/tr>\n<tr>\n<td>D\u00e9tection de la rectitude<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Les champs associ\u00e9s \u00e0 la tol\u00e9rance<\/h2>\n<p>Une tol\u00e9rance de diam\u00e8tre seule ne rend pas une barre usinable. Voici <a href=\"https:\/\/beiyutitanium.com\/fr\/machining-titanium-bar-stock-guide\/\">les param\u00e8tres qui d\u00e9terminent si elle se comporte comme pr\u00e9vu sur la machine<\/a>.<\/p>\n<table>\n<thead>\n<tr>\n<th>Champ<\/th>\n<th>Pourquoi il doit figurer sur la m\u00eame ligne<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00c9tat de surface<\/td>\n<td>D\u00e9termine quelle plage de tol\u00e9rance est r\u00e9alisable<\/td>\n<\/tr>\n<tr>\n<td>Rectitude<\/td>\n<td>Une barre conforme \u00e0 la tol\u00e9rance de diam\u00e8tre peut n\u00e9anmoins mal avancer<\/td>\n<\/tr>\n<tr>\n<td>Tol\u00e9rance de longueur et de coupe<\/td>\n<td>D\u00e9termine le chargement de la barre et la quantit\u00e9 perdue par pi\u00e8ce<\/td>\n<\/tr>\n<tr>\n<td>Sur\u00e9paisseur d'usinage<\/td>\n<td>Indique si une sur\u00e9paisseur est laiss\u00e9e pour une coupe de finition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Que mentionner dans la commande<\/h2>\n<pre style=\"white-space:pre-wrap;background:#f4f6f7;border:1px solid #dfe4e8;border-radius:4px;padding:14px 16px;font-size:13.5px;line-height:1.7;overflow-x:auto\">Diam\u00e8tre nominal: ______ Tol\u00e9rance de diam\u00e8tre: ______ (indiquer une valeur plus ou moins, ou une classe ISO avec la dimension nominale) \u00c9tat de surface: ______ (pel\u00e9, tourn\u00e9, rectifi\u00e9 sans centre ou poli) Rectitude: ______ mm par m\u00e8tre Tol\u00e9rance de longueur et de coupe: ______ Sur\u00e9paisseur d'usinage: ______ (indiquer si une sur\u00e9paisseur doit \u00eatre laiss\u00e9e pour une coupe de finition)<\/pre>\n<p>Une plage de tol\u00e9rance courante pour un diam\u00e8tre peut n\u00e9cessiter une op\u00e9ration sp\u00e9ciale pour un autre. Beiyu confirme <a href=\"https:\/\/beiyutitanium.com\/fr\/titanium-bar-forms-sizes-tolerances-guide\/\">la plage en fonction du diam\u00e8tre command\u00e9 et de l'\u00e9tat de surface<\/a> avant de soumettre une offre.<\/p>\n<div class=\"ti-rfq-box\">\n<h2>D\u00e9tails des sp\u00e9cifications avec sources<\/h2>\n<p>La tol\u00e9rance de diam\u00e8tre se d\u00e9termine dans un tableau de la norme produit, et non par une valeur unique. <a href=\"https:\/\/store.astm.org\/standards\/b348\" target=\"_blank\" rel=\"noopener\">ASTM B348<\/a> indique que les tol\u00e9rances applicables au mat\u00e9riau couvert par la sp\u00e9cification doivent \u00eatre celles indiqu\u00e9es dans ses tableaux dimensionnels (ASTM B348, dimensions, poids et variations admissibles), raison pour laquelle une tol\u00e9rance cit\u00e9e sans son diam\u00e8tre et sa forme de produit n'a pas de signification pr\u00e9cise.<\/p>\n<table data-c195=\"1\">\n<thead>\n<tr>\n<th>Ce que vous indiquez<\/th>\n<th>Ce avec quoi cela doit \u00eatre associ\u00e9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Une valeur plus et moins<\/td>\n<td>Le diam\u00e8tre command\u00e9, puisque la valeur n'est pas ind\u00e9pendante du diam\u00e8tre<\/td>\n<\/tr>\n<tr>\n<td>Une classe de tol\u00e9rance ISO<\/td>\n<td>La dimension \u00e0 laquelle elle s'applique, puisque la classe varie avec la taille<\/td>\n<\/tr>\n<tr>\n<td>Une plage resserr\u00e9e<\/td>\n<td>Le plan qui l'exige et l'\u00e9tat de surface auquel elle s'applique<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>La limite du produit est \u00e9galement importante : ASTM B348 d\u00e9finit une barre comme une section pleine de 16 pouces carr\u00e9s, 10 323 millim\u00e8tres carr\u00e9s, ou moins de surface de section transversale, une barre rectangulaire ne d\u00e9passant pas 10 pouces, 254 millim\u00e8tres, en largeur et d\u00e9passant 0.1875 pouce, 4.8 millim\u00e8tres, en \u00e9paisseur (ASTM B348, terminologie). Une entr\u00e9e de tableau de tol\u00e9rances pour barre ne s'applique pas \u00e0 la billette. Dans la pratique d'approvisionnement de Beiyu, les plages resserr\u00e9es indiqu\u00e9es sur cette page concernent la fili\u00e8re de barre rectifi\u00e9e sans centre de pr\u00e9cision et sont confirm\u00e9es pour le diam\u00e8tre et l'\u00e9tat de surface command\u00e9s avant \u00e9tablissement du prix.<\/p>\n<h2>Envoyer une demande de prix technique<\/h2>\n<p>Pour les demandes de prix de barres en titane, incluez la nuance, la norme, le diam\u00e8tre command\u00e9, la tol\u00e9rance exprim\u00e9e soit comme une classe avec sa dimension, soit comme une valeur plus et moins, l'\u00e9tat de surface, la longueur, la quantit\u00e9 et le certificat mati\u00e8re requis.<\/p>\n<p><a class=\"contact-popup-btn\" href=\"#contact-popup-btn\">Envoyer les d\u00e9tails de la demande de prix<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A tolerance is not one number for the whole bar range Diameter tolerance depends on how the bar was finished and on the diameter itself. Asking for a single figure across a size range usually produces a quotation that does not mean what the buyer thought it meant. What changes the achievable tolerance The surface [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[27,137],"tags":[],"class_list":["post-5431","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-technical-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Titanium Bar Diameter Tolerance: Value or ISO Class<\/title>\n<meta name=\"description\" content=\"A diameter tolerance is not one number across a size range. See what changes the achievable band and why an ISO h class and a plus-minus value are not interchangeable.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/beiyutitanium.com\/fr\/titanium-bar-diameter-tolerance-how-to-specify\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Titanium Bar Diameter Tolerance: Value or ISO Class\" \/>\n<meta property=\"og:description\" content=\"A diameter tolerance is not one number across a size range. See what changes the achievable band and why an ISO h class and a plus-minus value are not interchangeable.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/beiyutitanium.com\/fr\/titanium-bar-diameter-tolerance-how-to-specify\/\" \/>\n<meta property=\"og:site_name\" content=\"Beiyu Titanium\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-14T08:53:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-15T01:47:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/beiyutitanium.com\/wp-content\/uploads\/2026\/08\/titanium-bar-diameter-measurement.jpg\" \/>\n<meta name=\"author\" content=\"Penn Ma\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Penn Ma\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/\"},\"author\":{\"name\":\"Penn Ma\",\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/#\\\/schema\\\/person\\\/3560db17cf08813edf34f012735b971b\"},\"headline\":\"Titanium Bar Diameter Tolerance: Value or ISO Class\",\"datePublished\":\"2026-08-14T08:53:01+00:00\",\"dateModified\":\"2026-08-15T01:47:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/\"},\"wordCount\":669,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/beiyutitanium.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/titanium-bar-diameter-measurement-scaled.jpg\",\"articleSection\":[\"News\",\"Technical Guides\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/\",\"url\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/\",\"name\":\"Titanium Bar Diameter Tolerance: Value or ISO Class\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/titanium-bar-diameter-tolerance-how-to-specify\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/beiyutitanium.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/titanium-bar-diameter-measurement-scaled.jpg\",\"datePublished\":\"2026-08-14T08:53:01+00:00\",\"dateModified\":\"2026-08-15T01:47:35+00:00\",\"description\":\"A diameter tolerance is not one number across a size range. 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Over 15 years in titanium export he has learned to review each specification line himself, checking grade, standard, dimensions, tolerance and certificate scope against mill capability before quoting, rather than routing enquiries through a sales desk. He came to titanium supply from the other side of the transaction. Before leading Beiyu's international business he worked at Koch (Koch-Glitsch) and was directly involved in delivering a SABIC petrochemical project in Fujian, China. That work was built on inspection and test plans, material certification and heat traceability, third party inspection coordination, and project documentation and dossier control. Those are the same four things a process industry or regulated buyer will hold a titanium supplier to, and having had to enforce them as a customer is why they are treated here as part of the supply rather than as paperwork produced afterwards. His day-to-day work spans the questions this site is written to answer: choosing between commercially pure and alloyed titanium grades for a corrosive service, reading a mill test certificate against the ordered standard, and matching a buyer's designation (ASTM grade, UNS, German Werkstoff number or French NF code) to the same metal across markets. Beiyu supplies titanium, nickel-alloy and refractory mill products across bar, rod, plate, tube, block, ring, coil, ingot, forgings and machined parts, with EN 10204 3.1 documentation and heat-number traceability.\",\"url\":\"https:\\\/\\\/beiyutitanium.com\\\/fr\\\/author\\\/penn-ma\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Tol\u00e9rance de diam\u00e8tre des barres en titane : valeur ou classe ISO","description":"Une tol\u00e9rance de diam\u00e8tre n'est pas un chiffre unique sur toute une plage de dimensions. 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Avec plus de 15 ans d'exp\u00e9rience dans l'exportation de titane, il a appris \u00e0 examiner lui-m\u00eame chaque ligne de sp\u00e9cification, en v\u00e9rifiant la nuance, la norme, les dimensions, la tol\u00e9rance et le p\u00e9rim\u00e8tre du certificat par rapport aux capacit\u00e9s de l'usine avant d'\u00e9tablir une offre, plut\u00f4t que d'orienter les demandes vers un service commercial. Il est venu \u00e0 l'approvisionnement en titane depuis l'autre c\u00f4t\u00e9 de la transaction. Avant de diriger les activit\u00e9s internationales de Beiyu, il a travaill\u00e9 chez Koch (Koch-Glitsch) et a particip\u00e9 directement \u00e0 la r\u00e9alisation d'un projet p\u00e9trochimique SABIC dans le Fujian, en Chine. Ce travail reposait sur des plans de contr\u00f4le et d'essais, la certification des mat\u00e9riaux et la tra\u00e7abilit\u00e9 par num\u00e9ro de coul\u00e9e, la coordination du contr\u00f4le par tierce partie, ainsi que le contr\u00f4le de la documentation et des dossiers de projet. Ce sont les quatre m\u00eames \u00e9l\u00e9ments qu'un acheteur de l'industrie des proc\u00e9d\u00e9s ou un acheteur soumis \u00e0 r\u00e9glementation exigera d'un fournisseur de titane, et le fait d'avoir d\u00fb les faire appliquer en tant que client explique qu'ils soient trait\u00e9s ici comme faisant partie de la fourniture plut\u00f4t que comme des documents produits ult\u00e9rieurement. Son travail quotidien couvre les questions auxquelles ce site est destin\u00e9 \u00e0 r\u00e9pondre : choisir entre des nuances de titane commercialement pur et alli\u00e9 pour un service corrosif, lire un certificat mati\u00e8re par rapport \u00e0 la norme command\u00e9e, et faire correspondre la d\u00e9signation d'un acheteur (nuance ASTM, UNS, num\u00e9ro Werkstoff allemand ou code NF fran\u00e7ais) au m\u00eame m\u00e9tal sur diff\u00e9rents march\u00e9s. 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