{"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\/it\/titanium-bar-diameter-tolerance-how-to-specify\/","title":{"rendered":"Tolleranza del diametro della barra di titanio: valore o classe ISO"},"content":{"rendered":"
\"Digital<\/figure>\n

Una tolleranza non \u00e8 un solo numero per l'intera gamma di barre<\/h2>\n

La tolleranza del diametro dipende da come \u00e8 stata finita la barra<\/a> e dal diametro stesso. Richiedere un valore unico per un intervallo di dimensioni produce solitamente un'offerta che non significa ci\u00f2 che l'acquirente riteneva significasse.<\/p>\n\n\n\n\n\n\n\n
Cosa modifica la tolleranza ottenibile<\/th>\n<\/tr>\n<\/thead>\n
La condizione superficiale a cui viene finita la barra<\/td>\n<\/tr>\n
Il diametro ordinato<\/td>\n<\/tr>\n
Se il valore \u00e8 necessario su ogni barra o come media del lotto<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Cosa Beiyu mantiene nella linea di rettifica di precisione<\/h2>\n\n\n\n\n\n\n\n
Requisito<\/th>\nTolleranza sul diametro<\/th>\n<\/tr>\n<\/thead>\n
Barra standard rettificata senza centri di precisione<\/td>\nPi\u00f9 o meno 0,0127 mm<\/td>\n<\/tr>\n
Ristretta, dove il disegno lo richiede<\/td>\nPi\u00f9 o meno 0,0076 mm<\/td>\n<\/tr>\n
Barra pelata o tornita<\/td>\nSecondo la tabella delle tolleranze della norma ordinata<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Il valore ristretto viene definito rispetto al disegno anzich\u00e9 offerto come capacit\u00e0 generale, e viene confermato per il diametro ordinato prima della quotazione.<\/p>\n

I gradi ISO h e i valori pi\u00f9 o meno sono linguaggi diversi<\/h2>\n

I disegni di lavorazione meccanica riportano spesso una classe di tolleranza ISO, mentre le righe d'ordine dello stabilimento produttore riportano spesso un valore pi\u00f9 o meno. Non sono intercambiabili, perch\u00e9 una classe ISO dipende dal diametro e un valore pi\u00f9 o meno no.<\/p>\n\n\n\n\n\n\n\n
Come viene scritto<\/th>\nCosa implica<\/th>\n<\/tr>\n<\/thead>\n
Classe ISO h<\/td>\nLa fascia consentita cambia con il diametro nominale<\/td>\n<\/tr>\n
Pi\u00f9 o meno un valore<\/td>\nLa stessa fascia a ogni diametro nell'ordine<\/td>\n<\/tr>\n
Classe senza dimensione nominale<\/td>\nNon pu\u00f2 essere convertita in un limite di lavorazione meccanica<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

La tolleranza del diametro viene misurata, non presunta<\/h2>\n

Il diametro \u00e8 rilevato con laser a infrarossi su ogni pezzo che esce dalla linea di rettifica di precisione, motivo per cui la fascia pu\u00f2 essere trattata come criterio di accettazione anzich\u00e9 come obiettivo.<\/p>\n\n\n\n\n\n\n\n\n\n
Controllo al 100 per cento su tale linea<\/th>\n<\/tr>\n<\/thead>\n
Rilevamento dei difetti a ultrasuoni<\/td>\n<\/tr>\n
Rilevamento dei difetti a correnti indotte<\/td>\n<\/tr>\n
Controllo ottico superficiale<\/td>\n<\/tr>\n
Misurazione del diametro con laser a infrarossi<\/td>\n<\/tr>\n
Rilevamento della rettilineit\u00e0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

I campi associati alla tolleranza<\/h2>\n

Una tolleranza del diametro da sola non rende una barra lavorabile. Questi sono i campi che determinano se si comporta come previsto sulla macchina<\/a>.<\/p>\n\n\n\n\n\n\n\n\n
Campo<\/th>\nPerch\u00e9 appartiene alla stessa riga<\/th>\n<\/tr>\n<\/thead>\n
Stato superficiale<\/td>\nDetermina quale fascia di tolleranza sia ottenibile<\/td>\n<\/tr>\n
rettilineit\u00e0<\/td>\nUna barra entro la tolleranza di diametro pu\u00f2 comunque alimentarsi male<\/td>\n<\/tr>\n
Lunghezza e tolleranza di taglio<\/td>\nDetermina come viene caricata la barra e quanto si perde per componente<\/td>\n<\/tr>\n
Sovrametallo di lavorazione<\/td>\nIndica se viene lasciato sovrametallo per un taglio di finitura<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Cosa scrivere sull'ordine<\/h2>\n
Diametro nominale: ______\nTolleranza del diametro: ______ (indicare un valore pi\u00f9 o meno, oppure una classe ISO con la dimensione nominale)\nCondizione superficiale: ______ (pelata, tornita, rettificata senza centri o lucidata)\nrettilineit\u00e0: ______ mm per metro\nLunghezza e tolleranza di taglio: ______\nSovrametallo per lavorazione meccanica: ______ (indicare se deve essere lasciato sovrametallo per un taglio di finitura)<\/pre>\n
Una fascia di tolleranza ordinaria a un diametro pu\u00f2 essere un'operazione speciale a un altro. Beiyu conferma la fascia rispetto al diametro e alla condizione superficiale ordinati<\/a> prima di fare un'offerta.<\/p>\n
\n
Dettagli delle specifiche con fonti<\/h2>\n
La tolleranza sul diametro si ricava dalle tabelle della norma di prodotto, non \u00e8 un valore unico. ASTM B348<\/a> stabilisce che le tolleranze del materiale coperto dalla specifica devono corrispondere a quelle delle relative tabelle dimensionali (ASTM B348, dimensioni, peso e variazioni ammissibili), perci\u00f2 una tolleranza citata senza il diametro e la forma di prodotto non ha un significato preciso.<\/p>\n\n\n\n\n\n\n\n
Cosa indicare<\/th>\nA cosa deve essere associato<\/th>\n<\/tr>\n<\/thead>\n
Un valore positivo e negativo<\/td>\nIl diametro ordinato, poich\u00e9 il valore non \u00e8 indipendente dal diametro<\/td>\n<\/tr>\n
Una classe di tolleranza ISO<\/td>\nLa dimensione a cui si applica, poich\u00e9 la classe varia con la dimensione<\/td>\n<\/tr>\n
Un intervallo pi\u00f9 restrittivo<\/td>\nIl disegno che lo richiede e lo stato superficiale a cui si applica<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Conta anche il confine tra i prodotti: ASTM B348 definisce la barra come una sezione piena con area trasversale pari o inferiore a 16 square inches, 10 323 square millimetres, con barra rettangolare di larghezza non superiore a 10 inches, 254 millimetres, e spessore superiore a 0.1875 inch, 4.8 millimetres (ASTM B348, terminologia). Una voce della tabella delle tolleranze per le barre non si trasferisce alle billette. Nella prassi di fornitura di Beiyu, gli intervalli pi\u00f9 ristretti offerti in questa pagina riguardano il processo delle barre rettificate senza centri di precisione e vengono confermati per il diametro e lo stato superficiale ordinati prima della definizione del prezzo.<\/p>\n
Inviare una richiesta di offerta tecnica<\/h2>\n
Per le richieste di offerta di barre di titanio, includere il grado, la norma, il diametro ordinato, la tolleranza espressa come classe con la relativa dimensione oppure come valore positivo e negativo, lo stato superficiale, la lunghezza, la quantit\u00e0 e il certificato del materiale richiesto.<\/p>\n
Inviare i dettagli della richiesta di offerta<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"
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 […]<\/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":"\nTitanium Bar Diameter Tolerance: Value or ISO Class<\/title>\n<meta name=\"description\" content=\"A diameter tolerance is not one number across a size range. 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Production runs through the Beiyu titanium mill in Baoji, Shaanxi. Orders are RFQ-based, with EN 10204 3.1 mill test certificates and heat-number traceability available on request.\",\"areaServed\":\"Worldwide\",\"knowsAbout\":[\"Titanium\",\"Titanium alloy\",\"Titanium bar\",\"Titanium sheet and plate\",\"Titanium tube and pipe\",\"Titanium forgings\",\"Titanium wire\",\"Titanium anode\"],\"address\":{\"@type\":\"PostalAddress\",\"streetAddress\":\"Baotai Road Industrial Park, High-tech Development Zone\",\"addressLocality\":\"Baoji\",\"addressRegion\":\"Shaanxi\",\"addressCountry\":\"CN\"},\"legalName\":\"Jiaxing Beiyu New Materials Technology Co., Ltd.\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/beiyutitanium.com\\\/#\\\/schema\\\/person\\\/3560db17cf08813edf34f012735b971b\",\"name\":\"Penn Ma\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g\",\"caption\":\"Penn Ma\"},\"description\":\"Penn Ma is the person who answers the RFQs at Beiyu Titanium. 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\\\/it\\\/author\\\/penn-ma\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Tolleranza del diametro della barra di titanio: valore o classe ISO","description":"Una tolleranza di diametro non \u00e8 un unico valore per tutto un intervallo dimensionale. Vedere cosa modifica l'intervallo ottenibile e perch\u00e9 una classe ISO h e un valore pi\u00f9-meno non sono intercambiabili.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/beiyutitanium.com\/it\/titanium-bar-diameter-tolerance-how-to-specify\/","og_locale":"it_IT","og_type":"article","og_title":"Titanium Bar Diameter Tolerance: Value or ISO Class","og_description":"A diameter tolerance is not one number across a size range. 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La produzione avviene presso lo stabilimento produttore di titanio Beiyu a Baoji, Shaanxi. Gli ordini si basano su richieste di offerta, con certificati di collaudo 3.1 secondo EN 10204 e tracciabilit\u00e0 tramite il numero di colata disponibili su richiesta.","areaServed":"Worldwide","knowsAbout":["Titanium","Titanium alloy","Titanium bar","Titanium sheet and plate","Titanium tube and pipe","Titanium forgings","Titanium wire","Titanium anode"],"address":{"@type":"PostalAddress","streetAddress":"Baotai Road Industrial Park, High-tech Development Zone","addressLocality":"Baoji","addressRegion":"Shaanxi","addressCountry":"CN"},"legalName":"Jiaxing Beiyu New Materials Technology Co., Ltd."},{"@type":"Person","@id":"https:\/\/beiyutitanium.com\/#\/schema\/person\/3560db17cf08813edf34f012735b971b","name":"Penn Ma","image":{"@type":"ImageObject","inLanguage":"it-IT","@id":"https:\/\/secure.gravatar.com\/avatar\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/0659bdefb633d0d8e567b06d2f8bffac2a369834e53e96c922a06fd8a96f3c72?s=96&d=mm&r=g","caption":"Penn Ma"},"description":"Penn Ma \u00e8 la persona che risponde alle RFQ presso Beiyu Titanium. In oltre 15 anni nell'esportazione di titanio ha imparato a riesaminare personalmente ogni riga della specifica, verificando grado, norma, dimensioni, tolleranza e ambito del certificato rispetto alla capacit\u00e0 dello stabilimento produttore prima di formulare un'offerta, anzich\u00e9 inoltrare le richieste attraverso un ufficio vendite. \u00c8 arrivato alla fornitura di titanio dall'altra parte della transazione. Prima di guidare l'attivit\u00e0 internazionale di Beiyu ha lavorato presso Koch (Koch-Glitsch) ed \u00e8 stato direttamente coinvolto nella consegna di un progetto petrolchimico SABIC a Fujian, Cina. Tale lavoro si basava su piani di controllo e prova, certificazione dei materiali e tracciabilit\u00e0 tramite il numero di colata, coordinamento del collaudo di terza parte e controllo della documentazione e dei dossier di progetto. Sono le stesse quattro cose a cui un acquirente dell'industria di processo o regolamentato sottoporr\u00e0 un fornitore di titanio, e aver dovuto farle rispettare come cliente spiega perch\u00e9 qui siano trattate come parte della fornitura anzich\u00e9 come documentazione prodotta in seguito. Il suo lavoro quotidiano copre le questioni a cui questo sito intende rispondere: scegliere tra gradi di titanio commercialmente puro e legato per un servizio corrosivo, leggere un certificato del materiale rispetto alla norma ordinata e associare la designazione di un acquirente (grado ASTM, UNS, numero Werkstoff tedesco o codice NF francese) allo stesso metallo nei vari mercati. Beiyu fornisce prodotti di stabilimento in titanio, leghe di nichel e metalli refrattari in barra, tondo, lamiera spessa, tubo, blocco, anello, bobina, lingotto, pezzi forgiati e pezzi lavorati, con documentazione EN 10204 3.1 e tracciabilit\u00e0 tramite il numero di colata.","url":"https:\/\/beiyutitanium.com\/it\/author\/penn-ma\/"}]}},"_links":{"self":[{"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/posts\/5431","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/comments?post=5431"}],"version-history":[{"count":2,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/posts\/5431\/revisions"}],"predecessor-version":[{"id":5495,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/posts\/5431\/revisions\/5495"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/media\/5271"}],"wp:attachment":[{"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/media?parent=5431"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/categories?post=5431"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/beiyutitanium.com\/it\/wp-json\/wp\/v2\/tags?post=5431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}