{"id":100173,"date":"2026-02-15T20:25:00","date_gmt":"2026-02-15T20:25:00","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100173"},"modified":"2026-07-13T00:28:37","modified_gmt":"2026-07-13T00:28:37","slug":"nut-strength-class-iso898","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sr\/calculators\/nut-strength-class-iso898\/","title":{"rendered":"Nut Proof-Load Arithmetic Worksheet"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Nut Proof-Load Arithmetic Worksheet\",\"description\":\"Source-gated arithmetic worksheet for multiplying a verified nut proof stress by a verified tensile stress area. It does not reproduce ISO 898-2 tables or determine conformity.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/nut-strength-class-iso898\/\",\"applicationCategory\":\"EngineeringApplication\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2025-01-01\",\"dateModified\":\"2026-07-13\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true,\"featureList\":[\"Verified proof-stress input\",\"Verified tensile-stress-area input\",\"Proof-force arithmetic\",\"Strict source gate\"],\"keywords\":\"nut proof load, proof stress, tensile stress area, ISO 898-2:2022\"}\n<\/script>\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does this worksheet reproduce ISO 898-2 proof-stress tables?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Current table values depend on property class, nut style, thread diameter and pitch. Enter values only after checking the exact licensed table row or a controlled product specification.\"}},{\"@type\":\"Question\",\"name\":\"Can ISO 898-2:2022 be used for M64 nuts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Its published scope covers coarse threads M5 to M39 and fine threads M8x1 to M39x3. A different controlling specification is required outside that scope.\"}},{\"@type\":\"Question\",\"name\":\"Does calculated proof force establish conformity?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Multiplication of proof stress by stress area is arithmetic only. Nut conformity requires the specified product, dimensions, material, tests, marking and acceptance requirements.\"}},{\"@type\":\"Question\",\"name\":\"Can a nut be matched to a bolt by comparing class digits only?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not safely as a universal rule. Compatibility depends on the exact nut class\/style\/thread and bolt property class under the applicable standard and assembly requirements.\"}}]}\n<\/script>\n<script type=\"application\/ld+json\">\n{\"@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\":\"Nut Proof-Load Arithmetic Worksheet\",\"item\":\"https:\/\/vibromera.eu\/calculators\/nut-strength-class-iso898\/\"}]}\n<\/script>\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\"><link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin><link 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var(--m)}.vc-warning{padding:14px;background:var(--yl);border-left:3px solid var(--y);color:var(--is)}.vc-faq-item{border:1px solid var(--bl);margin-top:8px}.vc-faq-q{width:100%;padding:14px;border:0;background:var(--sa);text-align:left;font-weight:600}.vc-faq-a{display:none;padding:14px;color:var(--is)}.vc-faq-item.vc-open .vc-faq-a{display:block}.vc-related{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.vc-related a{padding:8px 14px;border:1px solid var(--b);border-radius:6px;text-decoration:none;color:var(--is)}.vc-promo{margin-top:24px;padding:20px;border:1px solid var(--b);border-radius:12px;background:var(--al);display:flex;justify-content:space-between}.vc-promo a{padding:8px 18px;background:var(--a);color:#fff;border-radius:6px;text-decoration:none}.vc-footer{text-align:center;padding:30px;color:var(--im);font-size:13px}.vc-footer a{color:var(--a)}@media(max-width:600px){.vc-grid,.vc-result-grid{grid-template-columns:1fr}.vc-full,.vc-primary,.vc-status{grid-column:1}.vc-promo{display:block}.vc-promo a{display:inline-block;margin-top:10px}}\n<\/style>\n<div class=\"vc-calculator\" id=\"vc-nut-proof\">\n<header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Source-gated engineering arithmetic<\/p><h1 class=\"vc-header-title\">Nut Proof-Load Worksheet<\/h1><p class=\"vc-header-subtitle\">Calculate proof force only from a proof stress and tensile stress area already verified for the exact nut style, property class, thread diameter and pitch. No ISO table values are guessed.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">ISO 898-2:2022 scope<\/span><span class=\"vc-badge\">No normative lookup<\/span><span class=\"vc-badge\">NEEDS_LICENSED_SOURCE<\/span><\/div><\/header>\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\" novalidate><div class=\"vc-grid\">\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-basis\">Value source basis<\/label><select class=\"vc-select\" id=\"vc-basis\"><option value=\"\">\u2014 Select source basis \u2014<\/option><option value=\"iso\">Licensed ISO 898-2:2022 row<\/option><option value=\"controlled\">Controlled product \/ project specification<\/option><\/select><\/div>\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-designation\">Exact nut\/thread record<\/label><input class=\"vc-input\" id=\"vc-designation\" type=\"text\" placeholder=\"class, style 0\/1\/2, diameter, pitch, tolerance\"><\/div>\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-sp\">Verified proof stress Sp <span class=\"vc-hint\">(MPa = N\/mm\u00b2; &gt; 0)<\/span><\/label><input class=\"vc-input\" id=\"vc-sp\" inputmode=\"decimal\"><\/div>\n<div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-as\">Verified tensile stress area As <span class=\"vc-hint\">(mm\u00b2; &gt; 0)<\/span><\/label><input class=\"vc-input\" id=\"vc-as\" inputmode=\"decimal\"><\/div>\n<div class=\"vc-field vc-full\"><label class=\"vc-label\" for=\"vc-source\">Source record<\/label><input class=\"vc-input\" id=\"vc-source\" type=\"text\" placeholder=\"document, edition, table\/row or controlled drawing\/specification\"><\/div>\n<div class=\"vc-field vc-full\"><label class=\"vc-check\" for=\"vc-gate\"><input id=\"vc-gate\" type=\"checkbox\"><span>I verified Sp and As for the same nut style, property class, nominal diameter, thread pitch and applicable specification. I understand this arithmetic does not establish proof-test acceptance, bolt compatibility, hardness, stripping resistance, preload or conformity.<\/span><\/label><\/div>\n<\/div><div class=\"vc-validation\" id=\"vc-validation\" role=\"status\" aria-live=\"polite\"><\/div><\/form>\n<div class=\"vc-results\" id=\"vc-results\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Arithmetic result<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\">\n<div class=\"vc-rcard vc-primary\"><div class=\"vc-rcard-label\">Proof force Fp = Sp \u00d7 As<\/div><div class=\"vc-rcard-value\" id=\"vc-r-force\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Verified proof stress<\/div><div class=\"vc-rcard-value\" id=\"vc-r-sp\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Verified stress area<\/div><div class=\"vc-rcard-value\" id=\"vc-r-as\">\u2014<\/div><\/div><div class=\"vc-status\">Normative table lookup, nut\/bolt matching, hardness, proof-test procedure and conformity are not assessed.<\/div>\n<\/div><\/div><\/div>\n<div class=\"vc-section vc-open\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"true\"><span class=\"vc-section-title\">Equation and ISO scope<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Arithmetic<\/h3><div class=\"vc-formula\">Fp [N] = Sp [N\/mm\u00b2] \u00d7 As [mm\u00b2]<\/div><p>This is dimensional arithmetic, not an independent ISO conformity calculation. Sp and As must come from the same controlled basis.<\/p><h3>Verified public scope of ISO 898-2:2022<\/h3><ul><li>Current edition 4, published September 2022; ISO 898-2:2012 is withdrawn.<\/li><li>Coarse-pitch ISO metric threads M5 to M39 and fine-pitch threads M8\u00d71 to M39\u00d73.<\/li><li>Property classes 04, 05, 5, 6, 8, 10 and 12; nut styles 0, 1 and 2.<\/li><li>Mechanical testing at 10 \u00b0C to 35 \u00b0C; service-temperature limitations require the standard and engineering review.<\/li><\/ul><div class=\"vc-warning\"><strong>Removed unsafe data:<\/strong> the former M42\u2013M64 claims are outside the published scope, and the code&#8217;s 0.94\/0.90 proof-stress reductions were not standard table values. The simplified hardness and bolt-matching table is also removed.<\/div><h3>Primary source<\/h3><p><a href=\"https:\/\/www.iso.org\/standard\/79349.html\" target=\"_blank\" rel=\"noopener\">ISO 898-2:2022 official catalogue page<\/a>. Exact proof-stress, hardness, compatibility and test rows remain <strong>NEEDS_LICENSED_SOURCE<\/strong>.<\/p><\/div><\/div><\/div>\n<div class=\"vc-section\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"false\"><span class=\"vc-section-title\">Related calculators<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a href=\"\/calculators\/bolt-strength-calculator\/\">Bolt Strength<\/a><a href=\"\/calculators\/bolt-preload-calculator\/\">Bolt Preload<\/a><a href=\"\/calculators\/bolt-dimensions-weight\/\">Bolt Dimensions<\/a><\/div><\/div><\/div><\/div>\n<div class=\"vc-section\"><button class=\"vc-section-toggle\" type=\"button\" aria-expanded=\"false\"><span class=\"vc-section-title\">Frequently asked questions<\/span><span>\u2304<\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div id=\"vc-faq-list\"><\/div><\/div><\/div><\/div>\n<div class=\"vc-promo\"><div><strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>Professional field balancing instruments and software.<\/div><a href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a><\/div><footer class=\"vc-footer\">\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 reviewed 13 July 2026<\/footer><\/div>\n<script>\n(function(){'use strict';function $(id){return document.getElementById(id)}function number(raw){var text=String(raw||'').trim();if(!text||(text.includes(',')&&text.includes('.')))return null;text=text.replace(',','.');if(!\/^(?:\\d+(?:\\.\\d*)?|\\.\\d+)$\/.test(text))return null;var value=Number(text);return Number.isFinite(value)&&value>0?value:null}function fmt(value,d){return value.toFixed(d).replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}function hide(message){$('vc-results').classList.remove('vc-visible');$('vc-validation').textContent=message||''}function calculate(){if(!$('vc-basis').value)return hide('Select the verified source basis.');if(!$('vc-designation').value.trim())return hide('Enter the exact nut style, class and thread designation.');if(!$('vc-source').value.trim())return hide('Enter the controlled source record.');if(!$('vc-gate').checked)return hide('Confirm that Sp and As were verified for the same exact configuration.');var sp=number($('vc-sp').value),area=number($('vc-as').value);if(sp===null||area===null)return hide('Enter complete positive Sp and As values.');var force=sp*area;if(!Number.isFinite(force))return hide('The entered values did not produce a finite force.');$('vc-r-force').textContent=fmt(force\/1000,6)+' kN ('+fmt(force,3)+' N)';$('vc-r-sp').textContent=fmt(sp,6)+' MPa';$('vc-r-as').textContent=fmt(area,6)+' mm\u00b2';$('vc-validation').textContent='';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);$('vc-copy-btn').addEventListener('click',function(){var text='Nut proof-load arithmetic\\n'+$('vc-designation').value.trim()+'\\n'+$('vc-r-force').textContent+'\\nSp: '+$('vc-r-sp').textContent+'\\nAs: '+$('vc-r-as').textContent+'\\nSource: '+$('vc-source').value.trim()+'\\nNo conformity or compatibility decision.\\nvibromera.eu\/calculators\/nut-strength-class-iso898\/';if(navigator.clipboard)navigator.clipboard.writeText(text).then(function(){var button=$('vc-copy-btn');button.textContent='Copied!';button.classList.add('vc-copied');setTimeout(function(){button.textContent='Copy';button.classList.remove('vc-copied')},2000)})});document.querySelectorAll('.vc-section-toggle').forEach(function(button){button.addEventListener('click',function(){var section=this.closest('.vc-section');section.classList.toggle('vc-open');this.setAttribute('aria-expanded',String(section.classList.contains('vc-open')))})});var faq=[['Does this reproduce ISO proof-stress tables?','No. Use the exact licensed row for the nut style, class, diameter and pitch.'],['Can ISO 898-2:2022 be used for M64?','No. Its published scope ends at M39.'],['Does Fp establish conformity?','No. It is arithmetic only; the specified tests and acceptance requirements still apply.'],['Can bolt compatibility be chosen from the first class digit?','Not as a universal rule. Verify the exact standard compatibility and assembly requirements.']];var list=$('vc-faq-list');faq.forEach(function(item){var wrapper=document.createElement('div');wrapper.className='vc-faq-item';var button=document.createElement('button');button.type='button';button.className='vc-faq-q';button.textContent=item[0];var answer=document.createElement('div');answer.className='vc-faq-a';answer.textContent=item[1];wrapper.appendChild(button);wrapper.appendChild(answer);list.appendChild(wrapper)});list.addEventListener('click',function(event){var button=event.target.closest('.vc-faq-q');if(button)button.closest('.vc-faq-item').classList.toggle('vc-open')});hide('')})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Source-gated proof-force arithmetic from verified proof stress and tensile stress area. 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