{"id":100177,"date":"2026-02-15T20:25:15","date_gmt":"2026-02-15T20:25:15","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100177"},"modified":"2026-02-15T20:25:15","modified_gmt":"2026-02-15T20:25:15","slug":"oil-viscosity-class-iso3448","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/oil-viscosity-class-iso3448\/","title":{"rendered":"Oil Viscosity Classes | ISO VG | ISO 3448"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Oil Viscosity Class Lookup \u2014 ISO 3448\",\"alternateName\":[\"ISO VG Calculator\",\"Viscosity Grade Lookup\",\"ISO 3448 Reference\"],\"description\":\"Free online ISO VG viscosity class lookup per ISO 3448. Enter kinematic viscosity at 40\u00b0C to find the matching ISO VG class, or select a class to see the viscosity range. Complete reference table VG2\u2013VG1500.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/oil-viscosity-class-iso3448\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2024-01-01\",\"dateModified\":\"2025-02-14\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true,\"featureList\":[\"18 ISO VG grades\",\"Viscosity-to-VG lookup\",\"VG-to-viscosity lookup\",\"Typical applications\",\"Complete reference table\"],\"keywords\":\"ISO VG, viscosity grade, ISO 3448, cSt, kinematic viscosity, hydraulic oil, gear oil\"}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What is ISO VG?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO VG (Viscosity Grade) is a classification system for industrial lubricants defined by ISO 3448. Each grade corresponds to a kinematic viscosity midpoint at 40\u00b0C in centistokes (cSt). For example, VG 46 means the oil has a midpoint viscosity of 46 cSt at 40\u00b0C, with an allowed range of 41.4\u201350.6 cSt (\u00b110%).\"}},\n{\"@type\":\"Question\",\"name\":\"How to choose the right viscosity grade?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The choice depends on the application: VG 32\u201346 for hydraulic systems, VG 68\u2013150 for industrial gearboxes, VG 220\u2013460 for heavy-duty enclosed gears, VG 10\u201322 for high-speed spindles. Always consult the equipment manufacturer's recommendations.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between ISO VG and SAE?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO VG grades are based on kinematic viscosity at 40\u00b0C and are used for industrial lubricants. SAE grades are used for automotive oils: SAE crankcase grades (e.g. 10W-30) are measured at 100\u00b0C, while SAE gear grades (e.g. 75W-90) use a different viscosity range. The two systems do not directly correspond.\"}},\n{\"@type\":\"Question\",\"name\":\"How does temperature affect viscosity?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oil viscosity decreases as temperature increases. The ISO VG system specifies viscosity at 40\u00b0C. The rate of change with temperature is described by the Viscosity Index (VI). A higher VI means less viscosity change with temperature. Typical mineral oils have VI 80\u2013100; synthetic oils can reach VI 150+.\"}},\n{\"@type\":\"Question\",\"name\":\"What is cSt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"cSt stands for centistokes (mm\u00b2\/s), the unit of kinematic viscosity. It measures how fast a fluid flows under gravity. 1 cSt = 1 mm\u00b2\/s. Dynamic viscosity in cP (centipoise) = kinematic viscosity in cSt \u00d7 density in g\/cm\u00b3.\"}}\n]}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[\n{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},\n{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},\n{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Oil Viscosity Classes ISO 3448\",\"item\":\"https:\/\/vibromera.eu\/calculators\/oil-viscosity-class-iso3448\/\"}\n]}\n<\/script>\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&#038;family=JetBrains+Mono:wght@400;500;600&#038;family=Fraunces:opsz,wght@9..144,700;9..144,800&#038;display=swap\" rel=\"stylesheet\">\n\n<style>\n:root {\n    --vc-bg: #f4f1ec;\n    --vc-surface: #ffffff;\n    --vc-surface-alt: #f8f6f2;\n    --vc-ink: #1a1a1a;\n    --vc-ink-secondary: #5a5650;\n    --vc-ink-muted: #8a857e;\n    --vc-accent: #c85a2a;\n    --vc-accent-hover: #b04d22;\n    --vc-accent-light: #fdf0ea;\n    --vc-blue: #2a5c8c;\n    --vc-blue-light: #eaf1f8;\n    --vc-green: #2a7a4b;\n    --vc-green-light: #eaf8ef;\n    --vc-yellow: #a67c00;\n    --vc-yellow-light: #fef9e8;\n    --vc-red: #b91c1c;\n    --vc-red-light: #fef2f2;\n    --vc-border: #d9d4cc;\n    --vc-border-light: #e8e4dd;\n    --vc-shadow: 0 1px 3px rgba(26,26,26,0.06), 0 4px 12px rgba(26,26,26,0.04);\n    --vc-shadow-lg: 0 4px 12px rgba(26,26,26,0.08), 0 16px 40px rgba(26,26,26,0.06);\n    --vc-radius: 8px;\n    --vc-radius-lg: 12px;\n    --vc-font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;\n    --vc-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;\n    --vc-display: 'Fraunces', Georgia, serif;\n}\n\n.vc-calculator {\n    font-family: var(--vc-font);\n    font-size: 15px;\n    line-height: 1.65;\n    color: var(--vc-ink);\n    max-width: 960px;\n    margin: 0 auto;\n    padding: 20px 16px 40px;\n    -webkit-font-smoothing: antialiased;\n}\n.vc-calculator *, .vc-calculator *::before, .vc-calculator *::after { box-sizing: border-box; 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font-weight:600; background:var(--vc-surface-alt); color:var(--vc-ink-secondary); border:1px solid var(--vc-border); border-radius:var(--vc-radius); text-decoration:none; transition:all 0.15s; }\n.vc-related-link:hover { border-color:var(--vc-accent); color:var(--vc-accent); background:var(--vc-accent-light); }\n\n\/* \u2500\u2500 PROMO \u2500\u2500 *\/\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; }\n.vc-promo-text { flex:1; font-size:14px; color:var(--vc-ink-secondary); }\n.vc-promo-text strong { color:var(--vc-ink); }\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; }\n.vc-promo-link:hover { background:var(--vc-accent-hover); }\n\n\/* \u2500\u2500 FOOTER \u2500\u2500 *\/\n.vc-footer { text-align:center; padding:32px 16px; font-size:13px; color:var(--vc-ink-muted); }\n.vc-footer a { color:var(--vc-accent); text-decoration:none; }\n.vc-footer a:hover { text-decoration:underline; }\n.vc-footer-links { margin-top:8px; font-size:12px; }\n.vc-footer-links a { margin:0 8px; }\n\n\/* \u2500\u2500 PRINT \u2500\u2500 *\/\n@media print {\n    .vc-section-body { max-height:none!important; }\n    .vc-faq-a { max-height:none!important; }\n    .vc-results { max-height:none!important; padding:24px!important; }\n    .vc-copy-btn, .vc-section-chevron, .vc-faq-chevron, .vc-presets, .vc-promo { display:none!important; }\n}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-oil-viscosity\">\n\n<!-- Header -->\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Oil Viscosity Classes \u2014 ISO VG<\/h1>\n    <p class=\"vc-header-subtitle\">Lookup ISO VG viscosity grade per ISO 3448. Enter kinematic viscosity at 40 \u00b0C to find the matching class, or select a VG grade to see the viscosity range and typical applications.<\/p>\n    <div class=\"vc-badges\">\n        <span class=\"vc-badge\">ISO 3448<\/span>\n        <span class=\"vc-badge\">VG 2 \u2013 VG 1500<\/span>\n        <span class=\"vc-badge\">cSt @ 40 \u00b0C<\/span>\n    <\/div>\n<\/header>\n\n<!-- Calculator Card -->\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-viscosity\">Viscosity at 40 \u00b0C <span class=\"vc-label-hint\">(cSt = mm\u00b2\/s)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-viscosity\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"e.g. 46\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-vg\">Or Select ISO VG Class<\/label>\n                <select class=\"vc-select\" id=\"vc-vg\">\n                    <option value=\"\">\u2014 select \u2014<\/option>\n                    <option value=\"2\">VG 2<\/option>\n                    <option value=\"3\">VG 3<\/option>\n                    <option value=\"5\">VG 5<\/option>\n                    <option value=\"7\">VG 7<\/option>\n                    <option value=\"10\">VG 10<\/option>\n                    <option value=\"15\">VG 15<\/option>\n                    <option value=\"22\">VG 22<\/option>\n                    <option value=\"32\">VG 32<\/option>\n                    <option value=\"46\">VG 46<\/option>\n                    <option value=\"68\">VG 68<\/option>\n                    <option value=\"100\">VG 100<\/option>\n                    <option value=\"150\">VG 150<\/option>\n                    <option value=\"220\">VG 220<\/option>\n                    <option value=\"320\">VG 320<\/option>\n                    <option value=\"460\">VG 460<\/option>\n                    <option value=\"680\">VG 680<\/option>\n                    <option value=\"1000\">VG 1000<\/option>\n                    <option value=\"1500\">VG 1500<\/option>\n                <\/select>\n            <\/div>\n        <\/div>\n\n        <!-- Presets -->\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vg=\"46\">VG 46<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vg=\"68\">VG 68<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-vg=\"220\">VG 220<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-cst=\"35\">35 cSt<\/button>\n        <\/div>\n    <\/form>\n\n    <!-- Results -->\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Results<\/h2>\n            <button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">\n                <svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg>\n                Copy\n            <\/button>\n        <\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">ISO VG Class<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-vg\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Viscosity Range (min \u2013 max)<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-range\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Midpoint Viscosity<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-mid\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Typical Application<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-app\" style=\"font-size:16px;\">\u2014<\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Full Reference Table -->\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udcd8<\/span>\n            <span class=\"vc-section-title\">ISO VG Reference Table &amp; Theory<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner vc-theory\">\n            <h3>ISO 3448 Viscosity Classification<\/h3>\n            <p>ISO 3448 defines 18 viscosity grades for industrial lubricants. Each grade is identified by a number equal to the nominal kinematic viscosity midpoint at 40 \u00b0C in centistokes (cSt). The allowed range is \u00b110% of the midpoint.<\/p>\n            <div class=\"vc-formula-box\">Range = Midpoint \u00d7 0.9 &nbsp;to&nbsp; Midpoint \u00d7 1.1 &nbsp;[cSt at 40 \u00b0C]<\/div>\n\n            <h3>Complete ISO VG Table<\/h3>\n            <table class=\"vc-table\" id=\"vc-ref-table\">\n                <thead><tr><th>ISO VG<\/th><th>Min (cSt)<\/th><th>Midpoint (cSt)<\/th><th>Max (cSt)<\/th><th>Typical Application<\/th><\/tr><\/thead>\n                <tbody id=\"vc-ref-tbody\"><\/tbody>\n            <\/table>\n\n            <h3>Application Guide<\/h3>\n            <table class=\"vc-table\">\n                <thead><tr><th>Application<\/th><th>Recommended ISO VG<\/th><\/tr><\/thead>\n                <tbody>\n                    <tr><td>High-speed spindles<\/td><td>VG 10 \u2013 VG 22<\/td><\/tr>\n                    <tr><td>Hydraulic systems<\/td><td>VG 32 \u2013 VG 46<\/td><\/tr>\n                    <tr><td>General machine lubrication<\/td><td>VG 46 \u2013 VG 68<\/td><\/tr>\n                    <tr><td>Industrial gearboxes<\/td><td>VG 68 \u2013 VG 150<\/td><\/tr>\n                    <tr><td>Heavy-duty enclosed gears<\/td><td>VG 220 \u2013 VG 460<\/td><\/tr>\n                    <tr><td>Very heavy \/ slow gears<\/td><td>VG 680 \u2013 VG 1500<\/td><\/tr>\n                <\/tbody>\n            <\/table>\n\n            <div class=\"vc-info-box\">\n                <p><strong>Note:<\/strong> ISO VG grades specify viscosity at 40 \u00b0C only. The actual operating viscosity depends on the oil temperature in service. Use the Viscosity Index (VI) to estimate viscosity at other temperatures.<\/p>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Related Calculators -->\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udd17<\/span>\n            <span class=\"vc-section-title\">Related Calculators<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-related\">\n                <a class=\"vc-related-link\" href=\"\/calculators\/viscosity-converter\/\">Viscosity Converter (ISO VG \u2194 SAE \u2194 AGMA)<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/metal-weight-calculator\/\">Metal Weight Calculator<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/residual-unbalance-iso1940\/\">Residual Unbalance (ISO 1940)<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/trial-weight-calculator\/\">Trial Weight Calculator<\/a>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- FAQ -->\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\u2753<\/span>\n            <span class=\"vc-section-title\">Frequently Asked Questions<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Promo -->\n<div class=\"vc-promo\">\n    <div class=\"vc-promo-text\">\n        <strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>\n        Professional field balancing instruments and software. Used in 50+ countries for rotating machinery maintenance.\n    <\/div>\n    <a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a>\n<\/div>\n\n<!-- Footer -->\n<footer class=\"vc-footer\">\n    <p>&copy; 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p>\n    <p style=\"font-size:12px;margin-top:4px;\">Based on ISO 3448. Last updated: February 2025<\/p>\n    <div class=\"vc-footer-links\">\n        <a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a>\n        <a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a>\n    <\/div>\n<\/footer>\n\n<\/div>\n\n<script>\n(function() {\n    'use strict';\n\n    var SLUG = 'oil-viscosity-class-iso3448';\n\n    function $(id) { return document.getElementById(id); }\n    function fmt(n, d) { if(isNaN(n)||!isFinite(n)) return '\u2014'; var f=n.toFixed(d===undefined?2:d); return f.replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,''); }\n\n    \/* \u2500\u2500 ISO VG DATA (ISO 3448) \u2500\u2500 *\/\n    var VG_DATA = [\n        { vg: 2,    min: 1.98,  max: 2.42,   app: 'Instrument oils, very light spindle oils' },\n        { vg: 3,    min: 2.88,  max: 3.52,   app: 'Light spindle oils' },\n        { vg: 5,    min: 4.14,  max: 5.06,   app: 'Light spindle oils' },\n        { vg: 7,    min: 6.12,  max: 7.48,   app: 'Spindle oils, pneumatic tool oils' },\n        { vg: 10,   min: 9.0,   max: 11.0,   app: 'High-speed spindle bearings' },\n        { vg: 15,   min: 13.5,  max: 16.5,   app: 'Spindle bearings, light hydraulic' },\n        { vg: 22,   min: 19.8,  max: 24.2,   app: 'Spindle bearings, hydraulic systems' },\n        { vg: 32,   min: 28.8,  max: 35.2,   app: 'Hydraulic systems, machine tools' },\n        { vg: 46,   min: 41.4,  max: 50.6,   app: 'Hydraulic systems (most common)' },\n        { vg: 68,   min: 61.2,  max: 74.8,   app: 'Hydraulic systems, industrial gearboxes' },\n        { vg: 100,  min: 90,    max: 110,    app: 'Industrial gearboxes, bearings' },\n        { vg: 150,  min: 135,   max: 165,    app: 'Industrial gearboxes, circulation systems' },\n        { vg: 220,  min: 198,   max: 242,    app: 'Enclosed gears, heavy-duty bearings' },\n        { vg: 320,  min: 288,   max: 352,    app: 'Enclosed gears, worm gears' },\n        { vg: 460,  min: 414,   max: 506,    app: 'Heavy enclosed gears' },\n        { vg: 680,  min: 612,   max: 748,    app: 'Very heavy gears, open gears' },\n        { vg: 1000, min: 900,   max: 1100,   app: 'Open gears, very slow heavy machinery' },\n        { vg: 1500, min: 1350,  max: 1650,   app: 'Open gears, residual compounds' }\n    ];\n\n    \/* \u2500\u2500 BUILD REFERENCE TABLE \u2500\u2500 *\/\n    function buildRefTable(highlightVG) {\n        var tbody = $('vc-ref-tbody');\n        var html = '';\n        VG_DATA.forEach(function(row) {\n            var cls = (highlightVG && row.vg === highlightVG) ? ' class=\"vc-highlight\"' : '';\n            html += '<tr' + cls + '><td><strong>VG ' + row.vg + '<\/strong><\/td><td>' + fmt(row.min, 2) + '<\/td><td>' + row.vg + '<\/td><td>' + fmt(row.max, 2) + '<\/td><td>' + row.app + '<\/td><\/tr>';\n        });\n        tbody.innerHTML = html;\n    }\n\n    \/* \u2500\u2500 FIND VG BY VISCOSITY \u2500\u2500 *\/\n    function findVG(cst) {\n        for (var i = 0; i < VG_DATA.length; i++) {\n            if (cst >= VG_DATA[i].min && cst <= VG_DATA[i].max) {\n                return VG_DATA[i];\n            }\n        }\n        \/\/ Find closest\n        var closest = null, minDist = Infinity;\n        VG_DATA.forEach(function(row) {\n            var mid = row.vg;\n            var dist = Math.abs(cst - mid);\n            if (dist < minDist) { minDist = dist; closest = row; }\n        });\n        return closest;\n    }\n\n    \/* \u2500\u2500 FIND VG BY CLASS \u2500\u2500 *\/\n    function findVGByClass(vg) {\n        for (var i = 0; i < VG_DATA.length; i++) {\n            if (VG_DATA[i].vg === vg) return VG_DATA[i];\n        }\n        return null;\n    }\n\n    \/* \u2500\u2500 DISPLAY RESULTS \u2500\u2500 *\/\n    function showResults(row, inputCst) {\n        if (!row) { $('vc-results').classList.remove('vc-visible'); return; }\n\n        var inRange = inputCst ? (inputCst >= row.min && inputCst <= row.max) : true;\n        var label = 'ISO VG ' + row.vg;\n        if (inputCst && !inRange) {\n            label += ' <span class=\"vc-rcard-unit\">(closest match)<\/span>';\n        }\n\n        $('vc-r-vg').innerHTML = label;\n        $('vc-r-range').innerHTML = fmt(row.min, 2) + ' \u2013 ' + fmt(row.max, 2) + ' <span class=\"vc-rcard-unit\">cSt<\/span>';\n        $('vc-r-mid').innerHTML = row.vg + ' <span class=\"vc-rcard-unit\">cSt<\/span>';\n        $('vc-r-app').innerHTML = row.app;\n\n        $('vc-results').classList.add('vc-visible');\n        buildRefTable(row.vg);\n    }\n\n    \/* \u2500\u2500 FROM VISCOSITY INPUT \u2500\u2500 *\/\n    var skipVgChange = false;\n    $('vc-viscosity').addEventListener('input', function() {\n        var cst = parseFloat(this.value);\n        if (!cst || cst <= 0) { $('vc-results').classList.remove('vc-visible'); buildRefTable(null); return; }\n        skipVgChange = true;\n        $('vc-vg').value = '';\n        skipVgChange = false;\n        var row = findVG(cst);\n        showResults(row, cst);\n        if (row) saveHistory({ mode: 'cst', viscosity: cst, vg: row.vg, _summary: cst + ' cSt \u2192 VG ' + row.vg });\n    });\n\n    \/* \u2500\u2500 FROM VG DROPDOWN \u2500\u2500 *\/\n    $('vc-vg').addEventListener('change', function() {\n        if (skipVgChange) return;\n        var vg = parseInt(this.value);\n        if (!vg) { $('vc-results').classList.remove('vc-visible'); buildRefTable(null); return; }\n        $('vc-viscosity').value = '';\n        var row = findVGByClass(vg);\n        showResults(row, null);\n        if (row) saveHistory({ mode: 'vg', vg: row.vg, _summary: 'VG ' + row.vg + ' \u2192 ' + fmt(row.min, 2) + '\u2013' + fmt(row.max, 2) + ' cSt' });\n    });\n\n    \/* \u2500\u2500 PRESETS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn) {\n        btn.addEventListener('click', function(e) {\n            e.preventDefault();\n            var vg = this.getAttribute('data-vg');\n            var cst = this.getAttribute('data-cst');\n            if (vg) {\n                $('vc-viscosity').value = '';\n                $('vc-vg').value = vg;\n                var row = findVGByClass(parseInt(vg));\n                showResults(row, null);\n            } else if (cst) {\n                $('vc-vg').value = '';\n                $('vc-viscosity').value = cst;\n                var row2 = findVG(parseFloat(cst));\n                showResults(row2, parseFloat(cst));\n            }\n        });\n    });\n\n    \/* \u2500\u2500 COPY \u2500\u2500 *\/\n    $('vc-copy-btn').addEventListener('click', function() {\n        var text = 'ISO VG Viscosity Class Lookup\\n' +\n            '\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\n' +\n            'ISO VG: ' + $('vc-r-vg').textContent + '\\n' +\n            'Range: ' + $('vc-r-range').textContent + '\\n' +\n            'Midpoint: ' + $('vc-r-mid').textContent + '\\n' +\n            'Application: ' + $('vc-r-app').textContent + '\\n' +\n            '\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\n' +\n            'vibromera.eu\/calculators\/oil-viscosity-class-iso3448\/';\n\n        if (navigator.clipboard) {\n            navigator.clipboard.writeText(text).then(function() {\n                var btn = $('vc-copy-btn');\n                btn.classList.add('vc-copied');\n                btn.innerHTML = '<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';\n                setTimeout(function() {\n                    btn.classList.remove('vc-copied');\n                    btn.innerHTML = '<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy';\n                }, 2000);\n            });\n        }\n    });\n\n    \/* \u2500\u2500 COLLAPSIBLE SECTIONS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn) {\n        btn.addEventListener('click', function() {\n            var section = this.closest('.vc-section');\n            var isOpen = section.classList.contains('vc-open');\n            section.classList.toggle('vc-open');\n            this.setAttribute('aria-expanded', !isOpen);\n        });\n    });\n\n    \/* \u2500\u2500 FAQ \u2500\u2500 *\/\n    var faqData = [\n        { q: 'What is ISO VG?', a: '<p>ISO VG (Viscosity Grade) is a classification system for industrial lubricants defined by <strong>ISO 3448<\/strong>. Each grade corresponds to a nominal kinematic viscosity at 40 \u00b0C in centistokes (cSt). The grade number equals the midpoint viscosity \u2014 for example, VG 46 means 46 cSt \u00b1 10%.<\/p><p>There are 18 grades from VG 2 to VG 1500, each step being roughly 50% higher than the previous.<\/p>' },\n        { q: 'How to choose the right viscosity grade?', a: '<p>The optimal viscosity depends on the application and operating conditions:<\/p><ul><li><strong>VG 10\u201322<\/strong> \u2014 High-speed spindles, light loads<\/li><li><strong>VG 32\u201346<\/strong> \u2014 Hydraulic systems (most common)<\/li><li><strong>VG 68\u2013150<\/strong> \u2014 Industrial gearboxes<\/li><li><strong>VG 220\u2013460<\/strong> \u2014 Heavy-duty enclosed gears<\/li><li><strong>VG 680\u20131500<\/strong> \u2014 Very heavy\/slow machinery<\/li><\/ul><p>Always consult the equipment manufacturer\\'s recommendations. Using too thin an oil leads to wear; too thick increases energy losses and heat.<\/p>' },\n        { q: 'What is the difference between ISO VG and SAE?', a: '<p><strong>ISO VG<\/strong> grades classify industrial lubricants by kinematic viscosity at 40 \u00b0C. <strong>SAE<\/strong> grades are used for automotive oils: SAE crankcase grades (e.g. 10W-30) and SAE gear grades (e.g. 75W-90) use different temperature references and scales.<\/p><p>The two systems do not directly correspond. Approximate cross-references exist \u2014 for example, ISO VG 46 \u2248 SAE 20, ISO VG 150 \u2248 SAE 40 \u2014 but these are only rough equivalents.<\/p>' },\n        { q: 'How does temperature affect viscosity?', a: '<p>Oil viscosity <strong>decreases<\/strong> as temperature increases. ISO VG grades specify viscosity at 40 \u00b0C only. The rate of viscosity change with temperature is described by the <strong>Viscosity Index (VI)<\/strong>.<\/p><p>A higher VI means less viscosity change with temperature. Typical mineral oils have VI 80\u2013100; synthetic oils can reach VI 150+. For critical applications, always verify viscosity at the actual operating temperature.<\/p>' },\n        { q: 'What is cSt?', a: '<p><strong>cSt<\/strong> (centistokes) is the unit of kinematic viscosity, equal to mm\u00b2\/s. It measures how quickly a fluid flows under gravity. The related unit <strong>cP<\/strong> (centipoise) measures dynamic viscosity.<\/p><p>Conversion: <strong>cP = cSt \u00d7 density<\/strong> (density in g\/cm\u00b3). For typical mineral oil at ~0.87 g\/cm\u00b3, cP \u2248 cSt \u00d7 0.87.<\/p>' }\n    ];\n\n    var faqList = $('vc-faq-list');\n    faqData.forEach(function(faq) {\n        faqList.innerHTML += '<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>' + faq.q + '<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">' + faq.a + '<\/div><\/div><\/div>';\n    });\n    faqList.addEventListener('click', function(e) {\n        var btn = e.target.closest('.vc-faq-q');\n        if (!btn) return;\n        btn.closest('.vc-faq-item').classList.toggle('vc-open');\n    });\n\n    \/* \u2500\u2500 HISTORY \u2500\u2500 *\/\n    function saveHistory(entry) {\n        var key = 'vc_history_' + SLUG;\n        var arr = [];\n        try { arr = JSON.parse(localStorage.getItem(key)) || []; } catch(e) {}\n        entry._ts = new Date().toISOString();\n        arr.unshift(entry);\n        if (arr.length > 10) arr = arr.slice(0, 10);\n        try { localStorage.setItem(key, JSON.stringify(arr)); } catch(e) {}\n    }\n\n    \/* \u2500\u2500 INIT \u2500\u2500 *\/\n    function init() {\n        buildRefTable(null);\n    }\n\n    if (document.readyState === 'loading') {\n        document.addEventListener('DOMContentLoaded', init);\n    } else {\n        init();\n    }\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Free online ISO VG viscosity class lookup per ISO 3448. Enter kinematic viscosity at 40\u00b0C to find the matching ISO VG class, or select a class to see the viscosity range. Complete reference table VG2\u2013VG1500.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100177","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100177","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100177\/revisions"}],"predecessor-version":[{"id":100492,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100177\/revisions\/100492"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}