{"id":100098,"date":"2026-02-15T20:16:30","date_gmt":"2026-02-15T20:16:30","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100098"},"modified":"2026-07-12T05:57:34","modified_gmt":"2026-07-12T05:57:34","slug":"flange-rating-lookup","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sl\/calculators\/flange-rating-lookup\/","title":{"rendered":"Primerjava dokumentiranega vrtanja prirobnic"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Documented Flange Drilling Comparison\",\"description\":\"Compare two user-supplied flange drilling records by pitch-circle diameter, hole count, hole diameter, outside diameter and thickness. No PN\/Class conversion or interchangeability verdict.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/flange-rating-lookup\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does matching entered drilling prove that two flanges are interchangeable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The comparison covers only the entered dimensions and hole count. Standard edition, pressure-temperature rating, material, flange type, facing, gasket, bolting, tolerances and the governing design still require verification.\"}},{\"@type\":\"Question\",\"name\":\"Does this page convert PN to ASME Class?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. PN and ASME Class are different designation systems whose ratings and dimensions depend on the controlling standard and complete flange basis. No automatic equivalence is asserted.\"}}]}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Documented flange drilling comparison\",\"item\":\"https:\/\/vibromera.eu\/calculators\/flange-rating-lookup\/\"}]}<\/script>\r\n<link rel=\"preconnect\" 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0.15s}\r\n.vc-related-link:hover{border-color:var(--vc-accent);color:var(--vc-accent);background:var(--vc-accent-light)}\r\n.vc-promo{margin-top:24px;padding:20px;background:linear-gradient(135deg,var(--vc-accent-light),var(--vc-surface));border:1px solid var(--vc-border);border-radius:var(--vc-radius-lg);display:flex;align-items:center;gap:16px}\r\n.vc-promo-text{flex:1;font-size:14px;color:var(--vc-ink-secondary)}.vc-promo-text strong{color:var(--vc-ink)}\r\n.vc-promo-link{padding:8px 20px;font-size:13px;font-weight:700;color:#fff;background:var(--vc-accent);border-radius:var(--vc-radius);text-decoration:none;white-space:nowrap;transition:background 0.15s}\r\n.vc-promo-link:hover{background:var(--vc-accent-hover)}\r\n.vc-footer{text-align:center;padding:32px 16px;font-size:13px;color:var(--vc-ink-muted)}\r\n.vc-footer a{color:var(--vc-accent);text-decoration:none}.vc-footer a:hover{text-decoration:underline}\r\n.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}\r\n@media print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-promo{display:none!important}}\r\n\r\n.vc-compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.vc-candidate{border:1px solid var(--vc-border-light);border-radius:8px;padding:18px;background:var(--vc-surface-alt)}.vc-candidate h2{font-family:var(--vc-display);font-size:20px;margin:0 0 14px}.vc-candidate-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.vc-span-2{grid-column:1\/-1}.vc-result-table-wrap{overflow-x:auto}.vc-result-table td:nth-child(n+2),.vc-result-table th:nth-child(n+2){text-align:right;white-space:nowrap}.vc-result-note{margin:0;color:var(--vc-ink-secondary);font-size:13px}@media(max-width:760px){.vc-compare-grid{grid-template-columns:1fr}}@media(max-width:500px){.vc-candidate-grid{grid-template-columns:1fr}.vc-span-2{grid-column:auto}}\r\n<\/style>\r\n<div class=\"vc-calculator\" id=\"vc-flange-comparison\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Documented dimensions required \u2014 no PN\/Class conversion<\/p><h1 class=\"vc-header-title\">Documented Flange Drilling Comparison<\/h1><p class=\"vc-header-subtitle\">Compare two sourced drilling records geometrically. A dimensional match is not an interchangeability,pressure-rating or joint-suitability decision.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">No standards lookup<\/span><span class=\"vc-badge\">No gasket recommendation<\/span><span class=\"vc-badge\">mm \u00b7 inch<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-field\" style=\"max-width:360px;margin-bottom:18px\"><label class=\"vc-label\" for=\"vc-unit\">Dimension unit for both records<\/label><select class=\"vc-select\" id=\"vc-unit\"><option value=\"\">Select\u2026<\/option><option value=\"mm\">millimetres (mm)<\/option><option value=\"in\">inches (in)<\/option><\/select><\/div><div class=\"vc-compare-grid\">\r\n<section class=\"vc-candidate\"><h2>Record A<\/h2><div class=\"vc-candidate-grid\">\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-a-label\">Exact flange designation \/ drawing item<\/label><input class=\"vc-input\" id=\"vc-a-label\" type=\"text\" maxlength=\"300\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-a-pcd\">Pitch-circle diameter<\/label><input class=\"vc-input\" id=\"vc-a-pcd\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-a-n\">Equally spaced hole count<\/label><input class=\"vc-input\" id=\"vc-a-n\" type=\"text\" inputmode=\"numeric\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-a-hole\">Hole diameter<\/label><input class=\"vc-input\" id=\"vc-a-hole\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-a-od\">Flange outside diameter<\/label><input class=\"vc-input\" id=\"vc-a-od\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-a-t\">Flange thickness<\/label><input class=\"vc-input\" id=\"vc-a-t\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-a-face\">Facing \/ gasket-interface record<\/label><input class=\"vc-input\" id=\"vc-a-face\" type=\"text\" maxlength=\"300\" placeholder=\"Exact type,designation or drawing note\"><\/div>\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-a-source\">Exact source location<\/label><input class=\"vc-input\" id=\"vc-a-source\" type=\"text\" maxlength=\"300\" placeholder=\"Standard\/edition\/table\/row or drawing revision\"><\/div>\r\n<\/div><\/section>\r\n<section class=\"vc-candidate\"><h2>Record B<\/h2><div class=\"vc-candidate-grid\">\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-b-label\">Exact flange designation \/ drawing item<\/label><input class=\"vc-input\" id=\"vc-b-label\" type=\"text\" maxlength=\"300\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b-pcd\">Pitch-circle diameter<\/label><input class=\"vc-input\" id=\"vc-b-pcd\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b-n\">Equally spaced hole count<\/label><input class=\"vc-input\" id=\"vc-b-n\" type=\"text\" inputmode=\"numeric\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b-hole\">Hole diameter<\/label><input class=\"vc-input\" id=\"vc-b-hole\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b-od\">Flange outside diameter<\/label><input class=\"vc-input\" id=\"vc-b-od\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b-t\">Flange thickness<\/label><input class=\"vc-input\" id=\"vc-b-t\" type=\"text\" inputmode=\"decimal\"><\/div>\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-b-face\">Facing \/ gasket-interface record<\/label><input class=\"vc-input\" id=\"vc-b-face\" type=\"text\" maxlength=\"300\" placeholder=\"Exact type,designation or drawing note\"><\/div>\r\n<div class=\"vc-field vc-span-2\"><label class=\"vc-label\" for=\"vc-b-source\">Exact source location<\/label><input class=\"vc-input\" id=\"vc-b-source\" type=\"text\" maxlength=\"300\" placeholder=\"Standard\/edition\/table\/row or drawing revision\"><\/div>\r\n<\/div><\/section><\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Comparison boundary:<\/strong> enter nominal values from controlling documents in one common unit. Even identical entered dimensions do not verify tolerances,bolt fit,clocking,facing,gasket,materials,pressure-temperature rating,loads or code compliance.<\/p><\/div><\/form>\r\n<div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Geometric comparison<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\">\r\n<div class=\"vc-rcard vc-rcard-primary\" id=\"vc-condition-card\"><div class=\"vc-rcard-label\">Entered numeric dimensions and hole count<\/div><div class=\"vc-rcard-value\" id=\"vc-r-condition\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">PCD difference,B\u2212A<\/div><div class=\"vc-rcard-value\" id=\"vc-r-pcd-diff\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Pitch-circle radial offset magnitude<\/div><div class=\"vc-rcard-value\" id=\"vc-r-radial\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Hole-count difference,B\u2212A<\/div><div class=\"vc-rcard-value\" id=\"vc-r-count-diff\">\u2014<\/div><\/div>\r\n<div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Hole-diameter difference,B\u2212A<\/div><div class=\"vc-rcard-value\" id=\"vc-r-hole-diff\">\u2014<\/div><\/div>\r\n<\/div><div class=\"vc-result-table-wrap\"><table class=\"vc-table vc-result-table\"><thead><tr><th>Quantity<\/th><th>Record A<\/th><th>Record B<\/th><th>B\u2212A<\/th><\/tr><\/thead><tbody id=\"vc-r-table\"><\/tbody><\/table><\/div><p class=\"vc-result-note\" id=\"vc-r-note\"><\/p><\/div><\/div>\r\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Formula,units and standards boundary<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\r\n<h3>Equal-hole-circle geometry<\/h3><div class=\"vc-formula-box\">angular pitch \u03b8=360\u00b0\/n<br>adjacent centre chord c=D\u00b7sin(\u03c0\/n)<br>nominal adjacent ligament g=c\u2212d<sub>h<\/sub><\/div><p>D is pitch-circle diameter,n is equally spaced hole count and d<sub>h<\/sub> is hole diameter. Radial pitch-circle offset is |D<sub>B<\/sub>\u2212D<sub>A<\/sub>|\/2. These are elementary nominal-circle relations,not flange design formulas.<\/p>\r\n<h3>Standards context \u2014 no closed dimensions implemented<\/h3><p><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-5-pipe-flanges-flanged-fittings-nps-1-2-nps-24-metric-inch-standard\/2025\" target=\"_blank\" rel=\"noopener\">ASME B16.5\u20142025<\/a> is the current edition and covers pressure-temperature ratings,materials,dimensions,tolerances,marking and testing for its stated NPS\/Class scope. Its official scope includes Class400,which the former page omitted.<\/p><p><a href=\"https:\/\/knowledge.bsigroup.com\/products\/flanges-and-their-joints-circular-flanges-for-pipes-valves-fittings-and-accessories-pn-designated-steel-flanges-2\" target=\"_blank\" rel=\"noopener\">EN1092-1:2018<\/a> is current and covers PN-designated steel flange types,facings,dimensions,tolerances,bolt sizes,materials and p\/T ratings. It superseded the2007+A1:2013 edition. Neither document establishes a universal one-line PN\u2194Class conversion.<\/p><p>This page contains no standard dimensional row. Obtain both records from licensed current standards,approved drawings or verified manufacturer data. The inch is converted exactly as1in=25.4mm per <a href=\"https:\/\/www.nist.gov\/pml\/owm\/si-units-length\" target=\"_blank\" rel=\"noopener\">NIST<\/a>. Status\/scope checked12July2026.<\/p>\r\n<div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Not evaluated:<\/strong> DN\/NPS equivalence,pressure-temperature capacity,material\/product form,flange type,hub\/bore,bolt specification,clearance\/tolerance,angular clocking,facing finish\/groove,gasket or ring number,joint assembly,external loads,corrosion,fatigue or jurisdiction.<\/p><\/div><\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Documented nominal geometry comparison only;not an interchangeability or pressure-rating decision. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';function $(id){return document.getElementById(id)}var fields=['vc-unit','vc-a-label','vc-a-pcd','vc-a-n','vc-a-hole','vc-a-od','vc-a-t','vc-a-face','vc-a-source','vc-b-label','vc-b-pcd','vc-b-n','vc-b-hole','vc-b-od','vc-b-t','vc-b-face','vc-b-source'];var keys=['unit','a_label','a_pcd','a_holes','a_hole_diameter','a_outside_diameter','a_thickness','a_facing','a_source','b_label','b_pcd','b_holes','b_hole_diameter','b_outside_diameter','b_thickness','b_facing','b_source'];var outs=['vc-r-condition','vc-r-pcd-diff','vc-r-radial','vc-r-count-diff','vc-r-hole-diff'];function num(raw){var s=String(raw).trim().replace(',','.');return \/^[+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?$\/.test(s)?Number(s):NaN}function fmt(x){if(Object.is(x,-0))x=0;return Number(x.toPrecision(12)).toString()}function 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strict,finite,positive number no more than10\u2079 selected units.'};D*=fac;dh*=fac;od*=fac;t*=fac;if(!(od>D))return{error:prefix+' outside diameter must be greater than its pitch-circle diameter.'};if(!(D>dh))return{error:prefix+' pitch-circle diameter must be greater than its hole diameter.'};var pitch=360\/n,chord=D*Math.sin(Math.PI\/n),eps=1e-12*Math.max(1,chord,dh);if(dh>chord+eps)return{error:prefix+' adjacent holes overlap because hole diameter exceeds centre chord.'};var ligament=chord-dh;if(Math.abs(ligament)<=eps)ligament=0;return{D:D,n:n,dh:dh,od:od,t:t,r:D\/2,pitch:pitch,chord:chord,ligament:ligament}}function calc(){var raw=fields.map(function(id){return $(id).value.trim()}),u=new URL(location),any=raw.some(Boolean);keys.forEach(function(k,i){if(raw[i])u.searchParams.set(k,raw[i]);else u.searchParams.delete(k)});history.replaceState(null,'',u.toString());if(!raw.every(Boolean)){clear();$('vc-error').textContent=any?'Complete all17 fields.':'';return}var 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'+unit;$('vc-r-count-diff').textContent=String(B.n-A.n);$('vc-r-hole-diff').textContent=fmt((B.dh-A.dh)\/div)+' '+unit;function row(name,a,b,suffix,scale){var d=b-a;return'<tr><td>'+name+'<\/td><td>'+fmt(a\/scale)+' '+suffix+'<\/td><td>'+fmt(b\/scale)+' '+suffix+'<\/td><td>'+fmt(d\/scale)+' '+suffix+'<\/td><\/tr>'}var html='';html+=row('Pitch-circle diameter',A.D,B.D,unit,div);html+=row('Pitch-circle radius',A.r,B.r,unit,div);html+=row('Outside diameter',A.od,B.od,unit,div);html+=row('Thickness',A.t,B.t,unit,div);html+=row('Hole diameter',A.dh,B.dh,unit,div);html+='<tr><td>Hole count<\/td><td>'+A.n+'<\/td><td>'+B.n+'<\/td><td>'+(B.n-A.n)+'<\/td><\/tr>';html+=row('Angular pitch',A.pitch,B.pitch,'\u00b0',1);html+=row('Adjacent centre chord',A.chord,B.chord,unit,div);html+=row('Nominal adjacent ligament',A.ligament,B.ligament,unit,div);$('vc-r-table').innerHTML=html;$('vc-r-note').textContent='A:'+raw[1]+' | Facing:'+raw[7]+' | Source:'+raw[8]+' || B:'+raw[9]+' | Facing:'+raw[15]+' | Source:'+raw[16]+' || No interchangeability,pressure-rating or gasket conclusion is made.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(button){button.addEventListener('click',function(){var section=this.closest('.vc-section');section.classList.toggle('vc-open');this.setAttribute('aria-expanded',section.classList.contains('vc-open'))})});var query=new URLSearchParams(location.search);keys.forEach(function(key,i){if(query.has(key))$(fields[i]).value=query.get(key)});calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Compare two sourced flange drilling records by pitch-circle diameter, hole count, hole diameter, outside diameter and thickness. 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