{"id":100110,"date":"2026-02-15T20:17:05","date_gmt":"2026-02-15T20:17:05","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100110"},"modified":"2026-02-15T20:17:05","modified_gmt":"2026-02-15T20:17:05","slug":"gear-accuracy-class","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/pt_br\/calculators\/gear-accuracy-class\/","title":{"rendered":"Calculadora de Classe de Precis\u00e3o de Engrenagens | ISO 1328-1 | Ferramenta Online Gratuita"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Gear Accuracy Class Calculator\",\"description\":\"Free ISO 1328-1 gear accuracy tolerance calculator.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/gear-accuracy-class\/\",\"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}<\/script>\n\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"What is ISO 1328-1?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ISO 1328-1 defines accuracy classes for cylindrical gears. Quality classes range from 0 (highest precision) to 12 (lowest). It specifies tolerances for pitch, profile, and helix deviations.\"}},\n{\"@type\":\"Question\",\"name\":\"What quality class do I need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Class 5-6: precision gearing (machine tools, instruments). Class 6-7: general engineering. Class 8-9: heavy machinery. Class 10-12: rough gearing. Most industrial gearboxes use class 6-8.\"}},\n{\"@type\":\"Question\",\"name\":\"What is total pitch deviation (Fp)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Fp is the maximum difference between the actual and theoretical cumulative pitch over all teeth. It reflects spacing accuracy of all teeth around the gear. Measured using gear measuring machines.\"}},\n{\"@type\":\"Question\",\"name\":\"What is profile deviation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Profile deviation measures how the actual tooth profile differs from the theoretical involute. It includes total profile deviation (F\u03b1), profile form deviation (ff\u03b1), and profile slope deviation (fH\u03b1).\"}},\n{\"@type\":\"Question\",\"name\":\"How are ISO 1328 tolerances calculated?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Tolerances depend on module (m), pitch diameter (d), and face width (b). Each quality class doubles the tolerance from the previous class. The formulas use geometric mean calculations based on these parameters.\"}}\n]}<\/script>\n\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\":\"Gear Accuracy Class\",\"item\":\"https:\/\/vibromera.eu\/calculators\/gear-accuracy-class\/\"}]}<\/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 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a:hover{text-decoration:underline}.vc-footer-links{margin-top:8px;font-size:12px}.vc-footer-links a{margin:0 8px}@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-presets,.vc-promo{display:none!important}}<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-gear-accuracy\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool #095<\/p>\n    <h1 class=\"vc-header-title\">Gear Accuracy Class Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">ISO 1328-1 gear accuracy tolerances. Enter module, pitch diameter, face width, and quality class to look up pitch deviation, profile deviation, and helix deviation tolerances.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">ISO 1328-1<\/span><span class=\"vc-badge\">Class 3\u201312<\/span><span class=\"vc-badge\">Tolerances<\/span><\/div>\n<\/header>\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\"><label class=\"vc-label\" for=\"vc-mod\">Module <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-mod\" inputmode=\"decimal\" step=\"any\" min=\"0.5\" placeholder=\"e.g. 3\" value=\"3\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-d\">Pitch Diameter <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-d\" inputmode=\"decimal\" step=\"any\" min=\"5\" placeholder=\"e.g. 120\" value=\"120\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-b\">Face Width <span class=\"vc-label-hint\">(mm)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-b\" inputmode=\"decimal\" step=\"any\" min=\"2\" placeholder=\"e.g. 30\" value=\"30\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-q\">Quality Class<\/label><select class=\"vc-select\" id=\"vc-q\"><option value=\"3\">Class 3 \u2014 Ultra precision<\/option><option value=\"4\">Class 4 \u2014 Precision instruments<\/option><option value=\"5\">Class 5 \u2014 Machine tools<\/option><option value=\"6\" selected>Class 6 \u2014 Precision gearing<\/option><option value=\"7\">Class 7 \u2014 General engineering<\/option><option value=\"8\">Class 8 \u2014 Industrial gearbox<\/option><option value=\"9\">Class 9 \u2014 Heavy machinery<\/option><option value=\"10\">Class 10 \u2014 Rough gearing<\/option><option value=\"11\">Class 11 \u2014 Low accuracy<\/option><option value=\"12\">Class 12 \u2014 Very rough<\/option><\/select><\/div>\n        <\/div>\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-m=\"2\" data-d=\"60\" data-b=\"20\" data-q=\"5\">m2, d60, Class 5<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-m=\"3\" data-d=\"120\" data-b=\"30\" data-q=\"6\">m3, d120, Class 6<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-m=\"5\" data-d=\"200\" data-b=\"50\" data-q=\"7\">m5, d200, Class 7<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-m=\"8\" data-d=\"400\" data-b=\"80\" data-q=\"8\">m8, d400, Class 8<\/button>\n        <\/div>\n    <\/form>\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Results<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\"><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<\/button><\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Quality Class<\/div><div class=\"vc-rcard-value\" id=\"vc-r-class\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Total Pitch Deviation F<sub>p<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-fp\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Single Pitch Deviation f<sub>pt<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-fpt\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Total Profile Deviation F<sub>\u03b1<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-fa\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Total Helix Deviation F<sub>\u03b2<\/sub><\/div><div class=\"vc-rcard-value\" id=\"vc-r-fb\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\"><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\">Theory &amp; Reference<\/span><\/span><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><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n    <h3>ISO 1328-1 Tolerance Formulas (Simplified)<\/h3>\n    <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n    <p>Where K is the class multiplier: each quality step doubles the tolerance (K\u2085=1, K\u2086=2, K\u2087=4, \u2026, K\u2081\u2082=128 relative to class 5).<\/p>\n    <h3>Quality Class Application Guide<\/h3>\n    <table class=\"vc-table\"><thead><tr><th>Class<\/th><th>Application<\/th><th>Typical Tolerance Scale<\/th><\/tr><\/thead><tbody>\n        <tr><td>3\u20134<\/td><td>Master gears, measuring instruments<\/td><td>Finest<\/td><\/tr>\n        <tr><td>5\u20136<\/td><td>Machine tools, precision gearboxes, turbine gears<\/td><td>Precision<\/td><\/tr>\n        <tr><td>7\u20138<\/td><td>General industrial gearboxes, vehicle transmissions<\/td><td>Standard<\/td><\/tr>\n        <tr><td>9\u201310<\/td><td>Heavy machinery, mining, cement<\/td><td>Coarse<\/td><\/tr>\n        <tr><td>11\u201312<\/td><td>Rough gearing, agricultural, slow speed<\/td><td>Very coarse<\/td><\/tr>\n    <\/tbody><\/table>\n<\/div><\/div><\/div>\n<div class=\"vc-section\" id=\"vc-sec-related\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udd17<\/span><span class=\"vc-section-title\">Related Calculators<\/span><\/span><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><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/spur-gear-calculator\/\">Spur Gear Calculator<\/a><a class=\"vc-related-link\" href=\"\/calculators\/gear-ratio-calculator\/\">Gear Ratio Calculator<\/a><a class=\"vc-related-link\" href=\"\/calculators\/worm-gear-calculator\/\">Worm Gear Calculator<\/a><\/div><\/div><\/div><\/div>\n<div class=\"vc-section\" id=\"vc-sec-faq\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\u2753<\/span><span class=\"vc-section-title\">Frequently Asked Questions<\/span><\/span><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><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div><\/div>\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional instruments. Used in 50+ countries.<\/div><a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div>\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p><p style=\"font-size:12px;margin-top:4px;\">Based on ISO 1328-1. Last updated: February 2025<\/p><div class=\"vc-footer-links\"><a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a><a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a><\/div><\/footer>\n<\/div>\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    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    \/\/ ISO 1328-1 simplified tolerance formulas\n    \/\/ Base tolerance at class 5, then multiply by 2^(class-5)\n    function classMultiplier(q){return Math.pow(Math.sqrt(2),q-5)}\n\n    function calculate(){\n        var m=parseFloat($('vc-mod').value),d=parseFloat($('vc-d').value);\n        var b=parseFloat($('vc-b').value),q=parseInt($('vc-q').value);\n        if(!m||!d||!b||m<=0||d<=0||b<=0){$('vc-results').classList.remove('vc-visible');return}\n\n        var K=classMultiplier(q);\n        \/\/ Simplified ISO 1328-1 formulas (\u03bcm) at class 5 base\n        var Fp_base=2.5*(Math.pow(d,0.34)+0.4*Math.sqrt(m)+6); \/\/ total cumulative pitch deviation\n        var fpt_base=0.3*Math.pow(m,0.3)+0.12*Math.pow(d,0.3)+2.5; \/\/ single pitch deviation\n        var Fa_base=3.2*Math.pow(m,0.35)+0.22*Math.pow(d,0.2)+0.7; \/\/ profile deviation\n        var Fb_base=0.4*Math.sqrt(b)+0.1*Math.pow(d,0.25)+3; \/\/ helix deviation\n\n        var Fp=Fp_base*K;\n        var fpt=fpt_base*K;\n        var Fa=Fa_base*K;\n        var Fb=Fb_base*K;\n\n        $('vc-r-class').innerHTML='ISO 1328-1 Class '+q;\n        $('vc-r-fp').innerHTML=fmt(Fp,1)+' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-r-fpt').innerHTML=fmt(fpt,1)+' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-r-fa').innerHTML=fmt(Fa,1)+' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-r-fb').innerHTML=fmt(Fb,1)+' <span class=\"vc-rcard-unit\">\u03bcm<\/span>';\n        $('vc-results').classList.add('vc-visible');\n    }\n\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn){btn.addEventListener('click',function(e){e.preventDefault();$('vc-mod').value=this.getAttribute('data-m');$('vc-d').value=this.getAttribute('data-d');$('vc-b').value=this.getAttribute('data-b');$('vc-q').value=this.getAttribute('data-q');calculate()})});\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    $('vc-copy-btn').addEventListener('click',function(){var text='Gear Accuracy (ISO 1328-1)\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nClass: '+$('vc-r-class').textContent+'\\nFp: '+$('vc-r-fp').textContent+'\\nfpt: '+$('vc-r-fpt').textContent+'\\nF\u03b1: '+$('vc-r-fa').textContent+'\\nF\u03b2: '+$('vc-r-fb').textContent+'\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu\/calculators\/gear-accuracy-class\/';if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';setTimeout(function(){b.classList.remove('vc-copied');b.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'},2000)})}});\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){btn.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});\n    var faqData=[{q:'What is ISO 1328-1?',a:'<p>ISO 1328-1 defines accuracy classes for cylindrical gears. Quality classes range from 0 (highest) to 12 (lowest). Specifies pitch, profile, and helix deviation tolerances.<\/p>'},{q:'What quality class do I need?',a:'<p>Class 5\u20136: precision gearing. Class 6\u20137: general engineering. Class 8\u20139: heavy machinery. Class 10\u201312: rough gearing.<\/p>'},{q:'What is total pitch deviation (Fp)?',a:'<p>Fp is the maximum difference between actual and theoretical cumulative pitch over all teeth. It reflects the overall spacing accuracy.<\/p>'},{q:'What is profile deviation?',a:'<p>Profile deviation (F\u03b1) measures how the actual tooth profile differs from the theoretical involute. Includes form and slope components.<\/p>'},{q:'How are ISO 1328 tolerances calculated?',a:'<p>Tolerances depend on module, pitch diameter, and face width. Each quality step roughly doubles the tolerance from the previous class.<\/p>'}];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.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\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n    function renderFormulas(){try{katex.render('F_p = K(Q) \\\\cdot (2.5(d^{0.34} + 0.4\\\\sqrt{m} + 6)) \\\\quad [\\\\mu m]',$('vc-katex-1'),{displayMode:true,throwOnError:false})}catch(e){}}\n    function init(){renderFormulas();calculate()}\n    if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',init)}else{init()}\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Calculadora online gratuita de precis\u00e3o de engrenagens ISO 1328-1. Consulte as toler\u00e2ncias de desvio total do passo, desvio do perfil e desvio da h\u00e9lice para as classes de qualidade 3 a 12.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100110","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100110\/revisions"}],"predecessor-version":[{"id":100411,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/calculator\/100110\/revisions\/100411"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/media?parent=100110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/categories?post=100110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/pt_br\/wp-json\/wp\/v2\/tags?post=100110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}