{"id":100020,"date":"2026-02-15T20:06:24","date_gmt":"2026-02-15T20:06:24","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100020"},"modified":"2026-02-15T20:06:24","modified_gmt":"2026-02-15T20:06:24","slug":"bearing-internal-clearance","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/bearing-internal-clearance\/","title":{"rendered":"Bearing Internal Clearance Calculator | C2 CN C3 C4 C5 | ISO 5753"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Bearing Internal Clearance Calculator\",\"alternateName\":[\"Bearing Clearance Lookup\",\"ISO 5753 Clearance Calculator\",\"Radial Clearance Calculator\"],\"description\":\"Free online engineering calculator for radial internal clearance of rolling bearings per ISO 5753-1. Supports clearance classes C2, CN (Normal), C3, C4, and C5.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/bearing-internal-clearance\/\",\"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\":[\"Clearance classes C2, CN, C3, C4, C5\",\"Bore diameter 10\u2013120 mm\",\"Comparison table of all classes\",\"Auto-calculation on input change\",\"URL parameter sharing\"],\"keywords\":\"bearing clearance, ISO 5753, radial clearance, C2, CN, C3, C4, C5\"}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What is bearing internal clearance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Internal clearance is the total distance through which one bearing ring can be moved relative to the other in the radial direction (radial clearance) or axial direction (axial clearance). It is measured before mounting and is critical for proper bearing function.\"}},\n{\"@type\":\"Question\",\"name\":\"When should I use C3 instead of CN (Normal) clearance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C3 clearance (greater than Normal) is used when the bearing operates at elevated temperatures, has a tight interference fit on the shaft, or both. The extra clearance compensates for thermal expansion and fit-induced reduction. C3 is common for electric motors and pumps.\"}},\n{\"@type\":\"Question\",\"name\":\"How does temperature affect bearing clearance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Temperature causes thermal expansion of bearing components. The inner ring typically heats more than the outer ring, reducing radial clearance. For high-temperature applications, select a larger clearance class (C3, C4, or C5) to ensure adequate operating clearance.\"}},\n{\"@type\":\"Question\",\"name\":\"How does interference fit affect bearing clearance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An interference fit on the shaft expands the inner ring raceway, reducing radial clearance. Similarly, an interference fit in the housing compresses the outer ring raceway. The clearance reduction depends on the magnitude of interference, bearing dimensions, and material. This is why bearings with interference fits often require C3 or greater clearance.\"}}\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\":\"Bearing Internal Clearance Calculator\",\"item\":\"https:\/\/vibromera.eu\/calculators\/bearing-internal-clearance\/\"}\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<link rel=\"stylesheet\" href=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.css\">\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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}\n\n\/* \u2500\u2500 RELATED \u2500\u2500 *\/\n.vc-related { display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }\n.vc-related-link { display:inline-block; padding:8px 16px; font-family:var(--vc-font); font-size:13px; 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-bearing-clearance\">\n\n<!-- Header -->\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Bearing Internal Clearance Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Look up radial internal clearance for rolling bearings by bore diameter and clearance class per ISO 5753-1. Covers classes C2, CN, C3, C4, and C5.<\/p>\n    <div class=\"vc-badges\">\n        <span class=\"vc-badge\">ISO 5753-1<\/span>\n        <span class=\"vc-badge\">Radial Ball Bearings<\/span>\n        <span class=\"vc-badge\">C2 \u2013 C5<\/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-bore\">Bearing Bore Diameter <span class=\"vc-label-hint\">(mm)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-bore\" inputmode=\"decimal\" step=\"any\" min=\"10\" max=\"120\" placeholder=\"e.g. 50\" value=\"50\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-class\">Clearance Class<\/label>\n                <select class=\"vc-select\" id=\"vc-class\">\n                    <option value=\"C2\">C2 \u2014 Less than Normal<\/option>\n                    <option value=\"CN\" selected>CN \u2014 Normal<\/option>\n                    <option value=\"C3\">C3 \u2014 Greater than Normal<\/option>\n                    <option value=\"C4\">C4 \u2014 Greater than C3<\/option>\n                    <option value=\"C5\">C5 \u2014 Greater than C4<\/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-d=\"25\" data-c=\"CN\">\u00d825 CN<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-d=\"50\" data-c=\"C3\">\u00d850 C3<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-d=\"80\" data-c=\"C3\">\u00d880 C3<\/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\">Radial Clearance Range<\/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 Clearance<\/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\">Clearance Class<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-class\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Bore Range Used<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-borerange\">\u2014<\/div>\n            <\/div>\n        <\/div>\n\n        <!-- Comparison table -->\n        <div class=\"vc-comparison-table\">\n            <h3>All Clearance Classes for Selected Bore<\/h3>\n            <table class=\"vc-table\" id=\"vc-comp-table\">\n                <thead><tr><th>Class<\/th><th>Min (\u03bcm)<\/th><th>Max (\u03bcm)<\/th><th>Midpoint (\u03bcm)<\/th><\/tr><\/thead>\n                <tbody id=\"vc-comp-body\"><\/tbody>\n            <\/table>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Theory & Reference -->\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\">Theory &amp; Reference<\/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>What is Internal Clearance?<\/h3>\n            <p>Bearing internal clearance is the total distance through which one bearing ring can be moved relative to the other in the radial direction. It is defined by ISO 5753-1 for radial rolling bearings.<\/p>\n            <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n            <p>Clearance is specified as a range (minimum to maximum) for each bore diameter group and clearance class. The actual clearance of a manufactured bearing falls within this range.<\/p>\n\n            <h3>Clearance Classes<\/h3>\n            <table class=\"vc-table\">\n                <thead><tr><th>Class<\/th><th>Description<\/th><th>Typical Use<\/th><\/tr><\/thead>\n                <tbody>\n                    <tr><td><strong>C2<\/strong><\/td><td>Less than Normal<\/td><td>Precision spindles, low noise applications<\/td><\/tr>\n                    <tr><td><strong>CN<\/strong><\/td><td>Normal (default)<\/td><td>General-purpose machinery, standard conditions<\/td><\/tr>\n                    <tr><td><strong>C3<\/strong><\/td><td>Greater than Normal<\/td><td>Electric motors, pumps, elevated temperature<\/td><\/tr>\n                    <tr><td><strong>C4<\/strong><\/td><td>Greater than C3<\/td><td>Heavy interference fits, high temperature<\/td><\/tr>\n                    <tr><td><strong>C5<\/strong><\/td><td>Greater than C4<\/td><td>Very high temperature, large interference fits<\/td><\/tr>\n                <\/tbody>\n            <\/table>\n\n            <h3>Effect of Fit and Temperature<\/h3>\n            <p>The mounted (operating) clearance is always less than the unmounted clearance due to:<\/p>\n            <ul>\n                <li><strong>Interference fit<\/strong> \u2014 shaft fit expands the inner ring, reducing clearance<\/li>\n                <li><strong>Temperature<\/strong> \u2014 inner ring typically runs hotter than outer ring<\/li>\n            <\/ul>\n            <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n\n            <h3>Practical Example<\/h3>\n            <div class=\"vc-example-box\">\n                <div class=\"vc-example-title\">Example \u2014 Bearing 6210, bore \u00d850 mm, class C3<\/div>\n                <p><strong>Given:<\/strong> d = 50 mm, Clearance class = C3<\/p>\n                <p>From ISO 5753-1 table (bore range 40\u201350 mm):<\/p>\n                <p>C3 clearance: <strong>20 \u2013 43 \u03bcm<\/strong><\/p>\n                <p>Midpoint: (20 + 43) \/ 2 = <strong>31.5 \u03bcm<\/strong><\/p>\n            <\/div>\n\n            <div class=\"vc-warning-box\">\n                <p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary);\"><strong>\u26a0\ufe0f Note:<\/strong> This table applies to radial ball bearings (deep groove, angular contact). Roller bearings, tapered roller bearings, and spherical roller bearings have different clearance tables per ISO 5753-1.<\/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\/bearing-heating-temperature\/\">Bearing Heating Temperature<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/torque-power-speed\/\">Torque \u2014 Power \u2014 Speed<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/shaft-radial-runout\/\">Shaft Radial Runout<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/residual-unbalance-iso1940\/\">Residual Unbalance (ISO 1940)<\/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. Achieve ISO compliance on-site. Used in 50+ countries.\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 5753-1. 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 src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function() {\n    'use strict';\n\n    var SLUG = 'bearing-internal-clearance';\n\n    function $(id) { return document.getElementById(id); }\n\n    \/* \u2500\u2500 ISO 5753-1 DATA \u2014 Radial ball bearings \u2500\u2500 *\/\n    var clearanceData = [\n        { dMin:10,  dMax:18,  C2:[3,18],   CN:[5,20],   C3:[13,33],  C4:[20,42],  C5:[28,53]  },\n        { dMin:18,  dMax:24,  C2:[5,20],   CN:[5,20],   C3:[13,33],  C4:[23,48],  C5:[30,58]  },\n        { dMin:24,  dMax:30,  C2:[5,20],   CN:[5,20],   C3:[13,33],  C4:[23,48],  C5:[30,58]  },\n        { dMin:30,  dMax:40,  C2:[6,20],   CN:[9,25],   C3:[18,38],  C4:[28,53],  C5:[40,68]  },\n        { dMin:40,  dMax:50,  C2:[6,23],   CN:[10,30],  C3:[20,43],  C4:[30,58],  C5:[45,73]  },\n        { dMin:50,  dMax:65,  C2:[8,28],   CN:[12,36],  C3:[23,51],  C4:[38,68],  C5:[55,90]  },\n        { dMin:65,  dMax:80,  C2:[10,30],  CN:[14,41],  C3:[28,58],  C4:[43,78],  C5:[63,103] },\n        { dMin:80,  dMax:100, C2:[12,36],  CN:[18,48],  C3:[30,66],  C4:[51,91],  C5:[71,117] },\n        { dMin:100, dMax:120, C2:[15,41],  CN:[20,53],  C3:[36,73],  C4:[56,101], C5:[81,127] }\n    ];\n\n    var classes = ['C2','CN','C3','C4','C5'];\n\n    function findRow(bore) {\n        for (var i = 0; i < clearanceData.length; i++) {\n            if (bore >= clearanceData[i].dMin && bore < clearanceData[i].dMax) return clearanceData[i];\n        }\n        \/\/ include upper boundary of last range\n        if (bore === 120) return clearanceData[clearanceData.length - 1];\n        return null;\n    }\n\n    \/* \u2500\u2500 CALCULATION \u2500\u2500 *\/\n    function calculate() {\n        var bore = parseFloat($('vc-bore').value);\n        var cls = $('vc-class').value;\n\n        if (!bore || bore < 10 || bore > 120) {\n            $('vc-results').classList.remove('vc-visible');\n            return;\n        }\n\n        var row = findRow(bore);\n        if (!row) {\n            $('vc-results').classList.remove('vc-visible');\n            return;\n        }\n\n        var range = row[cls];\n        var minC = range[0];\n        var maxC = range[1];\n        var mid = (minC + maxC) \/ 2;\n\n        \/\/ Primary result\n        $('vc-r-range').innerHTML = minC + ' \u2013 ' + maxC + ' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-r-mid').innerHTML = mid.toFixed(1) + ' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-r-class').innerHTML = cls + (cls === 'CN' ? ' <span class=\"vc-rcard-unit\">(Normal)<\/span>' : '');\n        $('vc-r-borerange').innerHTML = row.dMin + ' \u2013 ' + row.dMax + ' <span class=\"vc-rcard-unit\">mm<\/span>';\n\n        \/\/ Comparison table\n        var tbody = $('vc-comp-body');\n        tbody.innerHTML = '';\n        for (var i = 0; i < classes.length; i++) {\n            var c = classes[i];\n            var r = row[c];\n            var m = ((r[0] + r[1]) \/ 2).toFixed(1);\n            var highlight = (c === cls) ? ' class=\"vc-highlight\"' : '';\n            tbody.innerHTML += '<tr' + highlight + '><td><strong>' + c + '<\/strong>' + (c === cls ? ' \u2605' : '') + '<\/td><td>' + r[0] + '<\/td><td>' + r[1] + '<\/td><td>' + m + '<\/td><\/tr>';\n        }\n\n        $('vc-results').classList.add('vc-visible');\n\n        \/\/ URL params\n        var u = new URL(window.location);\n        u.searchParams.set('bore', bore);\n        u.searchParams.set('class', cls);\n        history.replaceState(null, '', u.toString());\n\n        \/\/ History\n        saveHistory({ bore: bore, class: cls, _summary: '\u00d8' + bore + ' mm, ' + cls + ': ' + minC + '\u2013' + maxC + ' \u03bcm' });\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            $('vc-bore').value = this.getAttribute('data-d');\n            $('vc-class').value = this.getAttribute('data-c');\n            calculate();\n        });\n    });\n\n    \/* \u2500\u2500 AUTO-CALCULATE \u2500\u2500 *\/\n    $('vc-form').addEventListener('input', calculate);\n    $('vc-form').addEventListener('change', calculate);\n\n    \/* \u2500\u2500 COPY \u2500\u2500 *\/\n    $('vc-copy-btn').addEventListener('click', function() {\n        var text = 'Bearing Internal Clearance\\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            'Bore diameter: ' + $('vc-bore').value + ' mm\\n' +\n            'Clearance class: ' + $('vc-class').value + '\\n' +\n            'Clearance range: ' + $('vc-r-range').textContent + '\\n' +\n            'Midpoint: ' + $('vc-r-mid').textContent + '\\n' +\n            'Bore range used: ' + $('vc-r-borerange').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\/bearing-internal-clearance\/';\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 bearing internal clearance?', a: '<p>Internal clearance is the total distance through which one bearing ring can be moved relative to the other in the radial direction (radial clearance) or axial direction (axial clearance). It is measured before mounting and is critical for proper bearing function, load distribution, and service life.<\/p><p>Too little clearance causes overheating and premature failure. Too much clearance results in noise and uneven load distribution.<\/p>' },\n        { q: 'When should I use C3 instead of CN (Normal) clearance?', a: '<p>C3 clearance (greater than Normal) is recommended when:<\/p><ul><li>The bearing operates at elevated temperatures (inner ring hotter than outer)<\/li><li>There is a tight interference fit on the shaft<\/li><li>Both conditions apply (common in electric motors and pumps)<\/li><\/ul><p>C3 is the most commonly specified non-standard clearance class for industrial applications.<\/p>' },\n        { q: 'How does temperature affect bearing clearance?', a: '<p>Temperature causes thermal expansion of bearing components. The inner ring, which is in contact with the shaft and closer to the heat source, typically heats more than the outer ring.<\/p><p>This differential expansion reduces the radial clearance. For high-temperature applications (above ~70\u00b0C on the inner ring), select a larger clearance class (C3, C4, or C5) to ensure adequate operating clearance remains.<\/p>' },\n        { q: 'How does interference fit affect clearance?', a: '<p>An interference fit on the shaft expands the inner ring raceway, directly reducing radial clearance. The amount of clearance reduction depends on:<\/p><ul><li>Magnitude of the interference<\/li><li>Bearing bore diameter and cross-section<\/li><li>Material properties (steel expansion coefficient)<\/li><\/ul><p>Rule of thumb: clearance reduction \u2248 70\u201390% of the radial interference on the shaft. This is why bearings with interference fits often require C3 or greater clearance.<\/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 URL PARAMS \u2500\u2500 *\/\n    function loadParams() {\n        var p = new URLSearchParams(window.location.search);\n        if (p.get('bore')) $('vc-bore').value = p.get('bore');\n        if (p.get('class')) $('vc-class').value = p.get('class');\n    }\n\n    \/* \u2500\u2500 KATEX \u2500\u2500 *\/\n    function renderFormulas() {\n        try {\n            katex.render('\\\\Delta_{\\\\text{clearance}} = \\\\Delta_{\\\\text{min}} \\\\ldots \\\\Delta_{\\\\text{max}} \\\\quad [\\\\mu m]', $('vc-katex-1'), { displayMode: true, throwOnError: false });\n            katex.render('\\\\Delta_{\\\\text{operating}} = \\\\Delta_{\\\\text{initial}} - \\\\Delta_{\\\\text{fit}} - \\\\Delta_{\\\\text{thermal}}', $('vc-katex-2'), { displayMode: true, throwOnError: false });\n        } catch(e) {}\n    }\n\n    \/* \u2500\u2500 INIT \u2500\u2500 *\/\n    function init() {\n        loadParams();\n        renderFormulas();\n        calculate();\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>ISO 5753-1 \u09aa\u09cd\u09b0\u09a4\u09bf \u09b0\u09cb\u09b2\u09bf\u0982 \u09ac\u09c7\u09af\u09bc\u09be\u09b0\u09bf\u0982\u0997\u09c1\u09b2\u09bf\u09b0 \u09b0\u09c7\u09a1\u09bf\u09af\u09bc\u09be\u09b2 \u0985\u09ad\u09cd\u09af\u09a8\u09cd\u09a4\u09b0\u09c0\u09a3 \u0995\u09cd\u09b2\u09bf\u09af\u09bc\u09be\u09b0\u09c7\u09a8\u09cd\u09b8\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0\u0964 \u09ac\u09cb\u09b0 \u09ac\u09cd\u09af\u09be\u09b8 \u098f\u09ac\u0982 \u0995\u09cd\u09b2\u09bf\u09af\u09bc\u09be\u09b0\u09c7\u09a8\u09cd\u09b8 \u0995\u09cd\u09b2\u09be\u09b8 C2, CN, C3, C4, C5 \u09a6\u09cd\u09ac\u09be\u09b0\u09be \u0995\u09cd\u09b2\u09bf\u09af\u09bc\u09be\u09b0\u09c7\u09a8\u09cd\u09b8 \u09aa\u09b0\u09bf\u09b8\u09c0\u09ae\u09be \u09a6\u09c7\u0996\u09c1\u09a8\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100020","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100020","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\/100020\/revisions"}],"predecessor-version":[{"id":100333,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100020\/revisions\/100333"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}