{"id":100042,"date":"2026-02-15T20:07:58","date_gmt":"2026-02-15T20:07:58","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100042"},"modified":"2026-07-11T21:36:47","modified_gmt":"2026-07-11T21:36:47","slug":"bolt-strength-class-iso898","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sl\/calculators\/bolt-strength-class-iso898\/","title":{"rendered":"Dekodirnik oznak trdnostnega razreda ISO 898-1"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"ISO 898-1 Property-Class Designation Decoder\",\"description\":\"Decode the nominal meaning of a selected carbon\/alloy-steel fastener property-class designation without generating proof loads or design recommendations.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/bolt-strength-class-iso898\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-11\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does the class code alone give all minimum properties?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. It encodes nominal strength relationships. Minimum tensile, yield\/proof, proof-load, elongation and hardness requirements must be taken from the exact applicable ISO 898-1 row, including diameter and product conditions.\"}},{\"@type\":\"Question\",\"name\":\"Does this page calculate proof load?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The previous proof-load lookup was removed because it mixed an out-of-scope size table with incomplete diameter-dependent property data.\"}},{\"@type\":\"Question\",\"name\":\"Can the class decoder select a bolt for an application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Selection requires complete joint design, environment, temperature, manufacturing and governing-code checks.\"}}]}<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[\r\n{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},\r\n{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},\r\n{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Bolt Strength Classes\",\"item\":\"https:\/\/vibromera.eu\/calculators\/bolt-strength-class-iso898\/\"}\r\n]}\r\n<\/script>\r\n\r\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\r\n\r\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\r\n\r\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\">\r\n\r\n<link rel=\"stylesheet\" href=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.css\">\r\n\r\n<style>\r\n:root {\r\n    --vc-bg: #f4f1ec;\r\n    --vc-surface: #ffffff;\r\n    --vc-surface-alt: #f8f6f2;\r\n    --vc-ink: #1a1a1a;\r\n    --vc-ink-secondary: #5a5650;\r\n    --vc-ink-muted: #8a857e;\r\n    --vc-accent: #c85a2a;\r\n    --vc-accent-hover: #b04d22;\r\n    --vc-accent-light: #fdf0ea;\r\n    --vc-blue: #2a5c8c;\r\n    --vc-blue-light: #eaf1f8;\r\n    --vc-green: #2a7a4b;\r\n    --vc-green-light: #eaf8ef;\r\n    --vc-yellow: #a67c00;\r\n    --vc-yellow-light: #fef9e8;\r\n    --vc-red: #b91c1c;\r\n    --vc-red-light: #fef2f2;\r\n    --vc-border: #d9d4cc;\r\n    --vc-border-light: #e8e4dd;\r\n    --vc-shadow: 0 1px 3px rgba(26,26,26,0.06), 0 4px 12px rgba(26,26,26,0.04);\r\n    --vc-shadow-lg: 0 4px 12px rgba(26,26,26,0.08), 0 16px 40px rgba(26,26,26,0.06);\r\n    --vc-radius: 8px;\r\n    --vc-radius-lg: 12px;\r\n    --vc-font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;\r\n    --vc-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;\r\n    --vc-display: 'Fraunces', Georgia, serif;\r\n}\r\n\r\n.vc-calculator {\r\n    font-family: var(--vc-font);\r\n    font-size: 15px;\r\n    line-height: 1.65;\r\n    color: var(--vc-ink);\r\n    max-width: 960px;\r\n    margin: 0 auto;\r\n    padding: 20px 16px 40px;\r\n    -webkit-font-smoothing: antialiased;\r\n}\r\n.vc-calculator *, .vc-calculator *::before, .vc-calculator *::after { box-sizing: border-box; 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text-decoration:none; }\r\n.vc-footer a:hover { text-decoration:underline; }\r\n.vc-footer-links { margin-top:8px; font-size:12px; }\r\n.vc-footer-links a { margin:0 8px; }\r\n\r\n@media print {\r\n    .vc-section-body { max-height:none!important; }\r\n    .vc-faq-a { max-height:none!important; }\r\n    .vc-results { max-height:none!important; padding:24px!important; }\r\n    .vc-copy-btn, .vc-section-chevron, .vc-faq-chevron, .vc-presets, .vc-promo { display:none!important; }\r\n}\r\n<\/style>\r\n\r\n<div class=\"vc-calculator\" id=\"vc-bolt-strength\">\r\n\r\n<!-- Header -->\r\n<header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Standards notation tool<\/p><h1 class=\"vc-header-title\">ISO 898-1 Property-Class Designation Decoder<\/h1><p class=\"vc-header-subtitle\">Decode the nominal meaning of a class code. This is not a table of minimum properties, proof load, hardness or application suitability.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">ISO 898-1:2013 scope<\/span><span class=\"vc-badge\">Nominal code only<\/span><span class=\"vc-badge\">No proof-load lookup<\/span><\/div><\/header>\r\n\r\n<!-- Calculator Card -->\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\"><div class=\"vc-form-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-class\">Property-class designation<\/label><select class=\"vc-select\" id=\"vc-class\"><option>4.6<\/option><option>4.8<\/option><option>5.6<\/option><option>5.8<\/option><option>6.8<\/option><option selected>8.8<\/option><option>9.8<\/option><option>10.9<\/option><option>12.9<\/option><\/select><\/div><\/div><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Scope:<\/strong> do not use decoded nominal values as guaranteed minima or design allowables. Verify diameter range, exact product, thread, temperature and every table row in the current licensed standard.<\/p><\/div><\/form><div class=\"vc-results vc-visible\" id=\"vc-results\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Designation meaning<\/h2><\/div><div class=\"vc-result-grid\"><div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Nominal tensile-strength code x\u00b7100<\/div><div class=\"vc-rcard-value\" id=\"vc-r-rm\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Nominal ratio code y\/10<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ratio\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Coded nominal product x\u00b7y\u00b710<\/div><div class=\"vc-rcard-value\" id=\"vc-r-product\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Selected designation<\/div><div class=\"vc-rcard-value\" id=\"vc-r-class\">\u2014<\/div><\/div><\/div><\/div><\/div>\r\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\">Meaning and limitations<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Code arithmetic<\/h3><div class=\"vc-formula-box\">class x.y \u2192 nominal Rm code=x\u00b7100 MPa; nominal ratio code=y\/10; coded product=x\u00b7y\u00b710 MPa<\/div><p>For 8.8 this reads 800 MPa, ratio 0.8 and coded product 640 MPa. These explain the designation; they do not replace the standard&#8217;s minimum-property tables.<\/p><h3>Current scope<\/h3><p><a href=\"https:\/\/www.iso.org\/standard\/60610.html\" target=\"_blank\" rel=\"noopener\">ISO 898-1:2013<\/a> was confirmed in 2025 and is marked for revision. Its official scope covers carbon\/alloy-steel fasteners M1.6\u2013M39 at 10\u201335 \u00b0C and excludes shear resistance, fatigue and torque\/clamp performance.<\/p><h3>Removed unsupported outputs<\/h3><p>The prior page extended to M48 and generated proof load, ultimate load, proof stress, elongation, hardness and application advice from an incomplete table. Exact values can vary with diameter and product conditions and require the licensed standard. Generic 75\u201390% preload advice and unrelated ISO links were also removed.<\/p><\/div><\/div><\/div>\r\n<div class=\"vc-section\" id=\"vc-sec-related\">\r\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\r\n        <span class=\"vc-section-toggle-text\">\r\n            <span class=\"vc-section-icon\">\ud83d\udd17<\/span>\r\n            <span class=\"vc-section-title\">Related Calculators<\/span>\r\n        <\/span>\r\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>\r\n    <\/button>\r\n    <div class=\"vc-section-body\">\r\n        <div class=\"vc-section-inner\">\r\n            <div class=\"vc-related\">\r\n                <a class=\"vc-related-link\" href=\"\/calculators\/metric-thread-dimensions\/\">Metric Thread Dimensions (ISO 261)<\/a>\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n<!-- FAQ -->\r\n<div class=\"vc-section\" id=\"vc-sec-faq\">\r\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\r\n        <span class=\"vc-section-toggle-text\">\r\n            <span class=\"vc-section-icon\">\u2753<\/span>\r\n            <span class=\"vc-section-title\">Frequently Asked Questions<\/span>\r\n        <\/span>\r\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>\r\n    <\/button>\r\n    <div class=\"vc-section-body\">\r\n        <div class=\"vc-section-inner\">\r\n            <div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\r\n\r\n<!-- Promo -->\r\n<div class=\"vc-promo\">\r\n    <div class=\"vc-promo-text\">\r\n        <strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>\r\n        Professional field balancing instruments and software. Used in 50+ countries.\r\n    <\/div>\r\n    <a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a>\r\n<\/div>\r\n\r\n<!-- Footer -->\r\n<footer class=\"vc-footer\"><p>\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Designation decoding only; exact properties require ISO 898-1 tables. Scientific review: July 2026.<\/p><\/footer>\r\n\r\n<\/div>\r\n\r\n<script>(function(){'use strict';var allowed=['4.6','4.8','5.6','5.8','6.8','8.8','9.8','10.9','12.9'];function $(i){return document.getElementById(i)}function calc(){var c=$('vc-class').value;if(!allowed.includes(c))return;var p=c.split('.'),a=Number(p[0]),b=Number(p[1]);$('vc-r-rm').innerHTML=(a*100)+' <span class=\"vc-rcard-unit\">MPa nominal code<\/span>';$('vc-r-ratio').innerHTML=(b\/10).toFixed(1)+' <span class=\"vc-rcard-unit\">nominal ratio<\/span>';$('vc-r-product').innerHTML=(a*b*10)+' <span class=\"vc-rcard-unit\">MPa coded nominal product<\/span>';$('vc-r-class').textContent=c;var u=new URL(location);u.searchParams.set('property_class',c);history.replaceState(null,'',u.toString())}$('vc-class').addEventListener('change',calc);document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){this.closest('.vc-section').classList.toggle('vc-open')})});var fl=$('vc-faq-list'),fs=[['Does the code give all minimum properties?','No. Use the exact diameter\/product row in the licensed standard.'],['Is this a proof-load calculator?','No. Proof-load output was removed.'],['Can it select a bolt?','No. Complete joint design is required.']];fs.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\">'+f[0]+'<\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\"><p>'+f[1]+'<\/p><\/div><\/div><\/div>'});fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});var q=new URLSearchParams(location.search),v=q.get('property_class');if(allowed.includes(v))$('vc-class').value=v;calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Decode the nominal meaning of ISO 898-1 carbon\/alloy-steel fastener class designations without unsupported proof-load tables or application advice.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100042","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100042\/revisions"}],"predecessor-version":[{"id":102333,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100042\/revisions\/102333"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/media?parent=100042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/categories?post=100042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/tags?post=100042"}],"curies":[{"name":"delovni list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}