{"id":5280,"date":"2026-08-11T12:27:21","date_gmt":"2026-08-11T12:27:21","guid":{"rendered":"https:\/\/beiyutitanium.com\/titanium-bar-tolerance-selector\/"},"modified":"2026-08-11T12:39:10","modified_gmt":"2026-08-11T12:39:10","slug":"titanium-bar-tolerance-selector","status":"publish","type":"page","link":"https:\/\/beiyutitanium.com\/fr\/titanium-bar-tolerance-selector\/","title":{"rendered":"S\u00e9lecteur de tol\u00e9rance pour barres en titane"},"content":{"rendered":"<p>Diameter tolerance is the field most often copied from the loosest class in the standard, and the field that most often decides whether bar runs cleanly or fights the machine. It is also written two different ways: as an ISO 286 h grade taken from the drawing, or as a plus and minus band taken from the supplier. This selector maps a diameter and an end use onto what Beiyu actually holds on the precision ground bar route, and returns the order line to write.<\/p>\n<style>\n.bytol{--ink:#14243a;--line:#dfe4e8;--mute:#5c6873;--acc:#0e8c79;--sunk:#f4f6f7;\n  font-size:15.5px;line-height:1.6;color:var(--mute)}\n.bytol .row{display:flex;flex-wrap:wrap;gap:18px;margin:18px 0}\n.bytol .fld{flex:1 1 220px;min-width:0}\n.bytol label{display:block;font-weight:600;color:var(--ink);font-size:14px;margin-bottom:6px}\n.bytol select,.bytol input{width:100%;padding:10px 12px;border:1px solid var(--line);\n  border-radius:4px;font-size:15px;background:#fff;color:var(--ink)}\n.bytol .out{margin-top:22px;border:1px solid var(--line);border-radius:5px;overflow:hidden}\n.bytol .out h4{margin:0;padding:12px 16px;background:var(--ink);color:#fff;font-size:14.5px;\n  letter-spacing:.02em}\n.bytol .out .body{padding:4px 16px 16px}\n.bytol .line{display:flex;gap:14px;padding:11px 0;border-bottom:1px solid var(--line);align-items:flex-start}\n.bytol .line:last-child{border-bottom:0}\n.bytol .line b{flex:0 0 168px;color:var(--ink);font-weight:600;font-size:14px}\n.bytol .line span{flex:1 1 auto;min-width:0}\n.bytol .flag{background:#f6e7e5;border-left:3px solid #a83f35;padding:12px 14px;margin-top:14px;\n  border-radius:0 4px 4px 0;font-size:14.5px}\n.bytol .ok{background:#e2f2ef;border-left:3px solid var(--acc)}\n.bytol .rfq{margin-top:16px;background:var(--sunk);border:1px solid var(--line);border-radius:4px;\n  padding:14px 16px;font-family:ui-monospace,\"SF Mono\",Menlo,Consolas,monospace;font-size:13.5px;\n  color:var(--ink);white-space:pre-wrap}\n.bytol .note{font-size:13.5px;margin-top:12px}\n<\/style>\n<div class=\"bytol\">\n<div class=\"row\">\n<div class=\"fld\">\n    <label for=\"bytol-dia\">Bar diameter<\/label><br \/>\n    <input id=\"bytol-dia\" type=\"number\" step=\"0.1\" min=\"0.5\" max=\"300\" value=\"10\" \/>\n  <\/div>\n<div class=\"fld\">\n    <label for=\"bytol-spec\">What the drawing specifies<\/label><br \/>\n    <select id=\"bytol-spec\"><option value=\"none\">Nothing yet, I am writing the order<\/option><option value=\"h\">An ISO 286 h grade (h6, h7, h8, h9)<\/option><option value=\"plusminus\">A plus or minus value<\/option><\/select>\n  <\/div>\n<div class=\"fld\">\n    <label for=\"bytol-use\">What happens to the bar next<\/label><br \/>\n    <select id=\"bytol-use\"><option value=\"swiss\">Sliding head or Swiss machining<\/option><option value=\"cnc\">Conventional CNC turning<\/option><option value=\"forge\">Forging or upset stock<\/option><option value=\"asis\">Used close to as supplied<\/option><\/select>\n  <\/div>\n<\/div>\n<div class=\"out\">\n<h4>What to write on the order<\/h4>\n<div class=\"body\" id=\"bytol-out\"><\/div>\n<\/div>\n<p class=\"note\">This tool reports the Beiyu supply envelope for precision ground titanium bar and what that means for the order line. It does not reproduce ISO 286 tolerance tables: state the grade your drawing calls for and it is confirmed against the current standard at quotation.<\/p>\n<\/div>\n<p><script>\n(function(){\n  var d=document.getElementById('bytol-dia'), s=document.getElementById('bytol-spec'),\n      u=document.getElementById('bytol-use'), o=document.getElementById('bytol-out');\n  if(!d||!o) return;\n  \/\/ All output is built with DOM APIs. No tag literals appear anywhere in this script,\n  \/\/ because WordPress wpautop treats tag text inside JS strings as real markup and\n  \/\/ splices paragraph tags into it, which breaks the script (hit twice on 2026-08-11).\n  function el(tag, cls, text){\n    var n=document.createElement(tag);\n    if(cls) n.className=cls;\n    if(text!=null) n.textContent=text;\n    return n;\n  }\n  function line(k,v){\n    var w=el('div','line'); w.appendChild(el('b',null,k)); w.appendChild(el('span',null,v)); return w;\n  }\n  function run(){\n    var dia=parseFloat(d.value)||0, spec=s.value, use=u.value;\n    var ground = (dia >= 3.175) && (dia <= 25.4), tiny = (dia > 0) && (dia < 3.175);\n    o.textContent='';\n    if(ground){\n    o.appendChild(line('Route','Precision centerless ground bar. This diameter sits inside the Beiyu ground range of 3.175 mm to 25.4 mm.'));\n    o.appendChild(line('Standard tolerance','plus or minus 0.0127 mm, equal to plus or minus 0.0005 in'));\n    o.appendChild(line('Tightened tolerance','plus or minus 0.0076 mm, equal to plus or minus 0.0003 in, by agreement at enquiry'));\n    o.appendChild(line('Surface','Polished, 32 microinch RMS as specified'));\n    o.appendChild(line('Condition','Annealed as the normal supply condition'));\n    } else if(tiny){\n    o.appendChild(line('Route','Below the 3.175 mm ground range. Fine diameters are reviewed against the drawing before quotation rather than quoted from a fixed envelope.'));\n    o.appendChild(line('What to send','Diameter, tolerance, length, straightness requirement and the controlling standard.'));\n    } else if(dia > 25.4){\n    o.appendChild(line('Route','Above the 25.4 mm ground range. Larger diameters are supplied peeled or turned, with tolerance agreed against the drawing.'));\n    o.appendChild(line('What to send','Diameter, required tolerance, length, condition and the controlling standard. State whether the bar is machining stock or forging stock, because the diameter logic differs.'));\n    } else {\n    o.appendChild(line('Route','Enter a diameter to see the applicable route.'));\n    }\n    if(spec==='h'){\n    o.appendChild(line('On the h grade','State the grade on the order. An h grade fixes a unilateral zone from nominal downward, while the ground envelope above is a symmetric plus and minus band, so the two are not interchangeable on paper even when the material is the same. The grade is confirmed against the current standard at quotation.'));\n    o.appendChild(line('Evidence','Beiyu supplies bar marked to an h grade where the drawing calls for it. Bar markings carry grade, condition, size and h grade, followed by the heat number.'));\n    } else if(spec==='plusminus'){\n    o.appendChild(line('On the plus and minus value','Compare it against the two figures above. Inside the standard band, no special handling applies. Between the standard and the tightened band, say so at enquiry so the grinding program is planned rather than priced afterwards. Tighter than the tightened band, send the drawing for review before quotation.'));\n    } else {\n    o.appendChild(line('If nothing is specified yet','Write the tolerance you actually need rather than copying the loosest class in the standard. A tolerance looser than the machine needs moves the problem into your setup. A tolerance tighter than the part needs is paid for on every bar.'));\n    }\n    if(use==='swiss'){\n    o.appendChild(line('Because it is Swiss machined','Diameter alone is not enough. State straightness as well, because bow over length is what decides whether bar feeds cleanly through a guide bushing. Pull both values from the process engineer rather than the standard.'));\n    } else if(use==='cnc'){\n    o.appendChild(line('Because it is conventionally turned','Diameter tolerance matters less than stock allowance and straightness. State the minimum finished diameter you must clean up to.'));\n    } else if(use==='forge'){\n    o.appendChild(line('Because it is forging stock','Forging stock runs to different diameter logic from machining stock. Say which it is on the enquiry, and state the required volume or weight per piece rather than a machining tolerance.'));\n    } else {\n    o.appendChild(line('Because it is used close to as supplied','Surface condition and straightness carry more weight than the last micron of diameter. State the surface requirement as a roughness value rather than the word polished.'));\n    }\n    var tol = (spec==='h') ? 'per drawing h grade'\n            : (ground ? 'plus or minus 0.0127 mm standard, or plus or minus 0.0076 mm tightened' : 'per drawing');\n    var rfq = [\n      'Grade and standard: ______',\n      'Diameter: '+(dia||'____')+' mm',\n      'Diameter tolerance: '+tol,\n      'Length and cut tolerance: ______',\n      'Condition: annealed unless stated',\n      'Surface: ______ (state a roughness value)',\n      'Straightness: ______'+((use==='swiss')?'   required for Swiss machining':''),\n      'Inspection scope: ______ (ultrasonic acceptance class if required)',\n      'Certificate: EN 10204 3.1 with chemistry and mechanicals per heat'\n    ].join('\\n');\n    o.appendChild(el('div','rfq',rfq));\n    o.appendChild(el('div', ground?'flag ok':'flag', ground\n      ? 'Diameter is inside the precision ground envelope. The tolerance above is held at the centerless grinding line, not corrected by a later operation.'\n      : 'Diameter is outside the precision ground envelope. Send the drawing so the route and the achievable tolerance are confirmed before a price goes out.'));\n  }\n  d.addEventListener('input',run); s.addEventListener('change',run); u.addEventListener('change',run);\n  run();\n})();\n<\/script><\/p>\n<h2>What Beiyu holds on precision ground bar<\/h2>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Beiyu supply envelope<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Diameter range, precision ground<\/td>\n<td>&Oslash;3.175 mm to &Oslash;25.4 mm (0.125 in to 1.000 in)<\/td>\n<\/tr>\n<tr>\n<td>Standard diameter tolerance<\/td>\n<td>&plusmn;0.0127 mm (&plusmn;0.0005 in)<\/td>\n<\/tr>\n<tr>\n<td>Tightened tolerance<\/td>\n<td>&plusmn;0.0076 mm (&plusmn;0.0003 in), by agreement at enquiry<\/td>\n<\/tr>\n<tr>\n<td>Surface<\/td>\n<td>Polished, 32 microinch RMS as specified<\/td>\n<\/tr>\n<tr>\n<td>Condition<\/td>\n<td>Annealed as the normal supply condition<\/td>\n<\/tr>\n<tr>\n<td>Above 25.4 mm<\/td>\n<td>Supplied peeled or turned, tolerance agreed against the drawing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The tolerance is held at the centerless grinding line. No later operation corrects it, which is why the tightened band has to be agreed at enquiry rather than requested after the order.<\/p>\n<h2>Why the two ways of writing tolerance are not interchangeable<\/h2>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>ISO 286 h grade<\/th>\n<th>Plus and minus band<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Shape of the zone<\/td>\n<td>Unilateral: from nominal downward only<\/td>\n<td>Symmetric around nominal<\/td>\n<\/tr>\n<tr>\n<td>Where it comes from<\/td>\n<td>The drawing, usually from the designer<\/td>\n<td>The supplier, describing what the process holds<\/td>\n<\/tr>\n<tr>\n<td>What it assumes<\/td>\n<td>Nominal is the maximum size<\/td>\n<td>Nominal is the centre of the band<\/td>\n<\/tr>\n<tr>\n<td>Practical consequence<\/td>\n<td>Parts never exceed nominal, which suits a fit<\/td>\n<td>Stock allowance is the same on both sides<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Because the zones are different shapes, a bar can satisfy one and not the other at the same nominal size. State which system the order uses. If the drawing carries an h grade, put the grade on the order and it is confirmed against the current standard at quotation.<\/p>\n<h2>The three fields that travel with tolerance<\/h2>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Why it belongs on the same line<\/th>\n<th>What happens if it is left off<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Straightness<\/td>\n<td>Bow over length decides whether bar feeds through a guide bushing<\/td>\n<td>Diameter is in tolerance and the bar still will not run<\/td>\n<\/tr>\n<tr>\n<td>Surface<\/td>\n<td>Stated as a roughness value, not the word polished<\/td>\n<td>Polished is a workshop word and cannot be accepted against<\/td>\n<\/tr>\n<tr>\n<td>Condition<\/td>\n<td>Annealed is the normal supply condition for ground bar<\/td>\n<td>Mechanical results on the certificate may not match the delivery condition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Specification detail with sources<\/h2>\n<p>The numbers this selector returns come from the Beiyu Titanium precision ground bar programme: diameter tolerance plus or minus 0.0127 mm (0.0005 in), tightened to plus or minus 0.0076 mm (0.0003 in) where the drawing calls for it and it is agreed at enquiry, across a diameter range of 3.175 mm to 25.4 mm (0.125 in to 1.000 in). Those figures describe that one route and are not a general tolerance for every diameter Beiyu supplies.<\/p>\n<p>The h grades this page maps against are ISO 286 limits taken from the drawing rather than Beiyu values, and the two ways of writing tolerance are not interchangeable: an h grade is a one-sided band referenced to the nominal size, while a plus-and-minus value is a two-sided band. ASTM B348 governs the industrial bar route, with ASTM F67 and ASTM F136 among the medical ones; the tolerance that applies to a given order is the one written on that order, so this page returns the line to write, not an approval.<\/p>\n<h2>Related<\/h2>\n<ul>\n<li><a href=\"\/product\/ti-6al-4v-eli-titanium-bar\/\">Ti-6Al-4V ELI titanium bar, Grade 23 to ASTM F136<\/a><\/li>\n<li><a href=\"\/product\/astm-f67-titanium-bars\/\">ASTM F67 titanium bar, CP Grades 1 to 4<\/a><\/li>\n<li><a href=\"\/medical-titanium-bar-rfq-checklist\/\">Medical titanium bar RFQ checklist<\/a><\/li>\n<li><a href=\"\/astm-b348-titanium-bar-billet-guide\/\">ASTM B348 titanium bar and billet guide<\/a><\/li>\n<li><a href=\"\/titanium-weight-calculator\/\">Titanium weight calculator<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Diameter tolerance is the field most often copied from the loosest class in the standard, and the field that most often decides whether bar runs cleanly or fights the machine. It is also written two different ways: as an ISO 286 h grade taken from the drawing, or as a plus and minus band taken [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","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 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plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Titanium Bar Tolerance Selector: h Grade or Plus-Minus | Beiyu<\/title>\n<meta name=\"description\" content=\"Work out which diameter tolerance to write on a titanium bar order: an ISO 286 h grade or a plus and minus band, what Beiyu holds on precision ground bar, and the fields that travel with it.\" \/>\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-tolerance-selector\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Titanium Bar Tolerance Selector: h Grade or Plus-Minus | Beiyu\" \/>\n<meta property=\"og:description\" content=\"Work out which diameter tolerance to write on a titanium bar order: an ISO 286 h grade or a plus and minus band, what Beiyu holds on 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