{"id":100249,"date":"2026-02-15T20:29:40","date_gmt":"2026-02-15T20:29:40","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100249"},"modified":"2026-03-05T15:40:32","modified_gmt":"2026-03-05T15:40:32","slug":"stud-bolt-torque","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/tl\/calculators\/stud-bolt-torque\/","title":{"rendered":"Stud Bolt Torque Calculator \u2014 Libreng Preload Tool | Vibromera"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Stud Bolt Torque Calculator\",\"description\":\"Free online calculator for double-end stud bolt tightening torque and preload.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/stud-bolt-torque\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"datePublished\":\"2025-01-01\",\"dateModified\":\"2026-02-15\",\"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 a stud bolt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A stud bolt (or double-end stud) is a threaded rod without a head, threaded on both ends. One end screws into a tapped hole (or has two nuts), and the other end receives a nut for clamping. They are common in flange joints and high-temperature applications.\"}},\n{\"@type\":\"Question\",\"name\":\"How is stud bolt torque calculated?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The same formula as standard bolts: T = K \u00d7 d \u00d7 F, where K is the nut factor, d is the nominal diameter, and F is the target preload. The preload is F = \u03b7 \u00d7 Rp \u00d7 As.\"}},\n{\"@type\":\"Question\",\"name\":\"Why use stud bolts instead of regular bolts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Stud bolts are preferred when: (1) the joint must be assembled\/disassembled frequently, (2) high-temperature service (avoids bolt head distortion), (3) tapped holes in cast iron or aluminum, (4) flange connections per ASME B16.5.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the nut factor K for stud bolts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The nut factor is the same as for standard bolts: K \u2248 0.20 for dry steel, 0.15 for lubricated, 0.12 for anti-seize paste. For stud bolts, both nut-bearing surfaces must be considered if two nuts are tightened.\"}},\n{\"@type\":\"Question\",\"name\":\"Should I torque both nuts on a stud bolt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In most flange applications, only the nut on the free end is torqued. The end screwed into the tapped hole (or the bottom nut on a through-stud) is installed to a snug fit first. In double-nut configurations, both nuts are torqued in a cross-pattern sequence.\"}}\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\":\"Stud Bolt Torque\",\"item\":\"https:\/\/vibromera.eu\/calculators\/stud-bolt-torque\/\"}]}<\/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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class=\"vc-calculator\" id=\"vc-stud-torque\">\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Stud Bolt Torque Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Calculate tightening torque and preload for double-end stud bolts. Same torque approach as standard bolts, adapted for stud applications.<\/p>\n    <div class=\"vc-badges\"><span class=\"vc-badge\">ISO 898-1<\/span><span class=\"vc-badge\">VDI 2230<\/span><span class=\"vc-badge\">ASME PCC-1<\/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-size\">Stud Size<\/label>\n                <select class=\"vc-select\" id=\"vc-size\">\n                    <option value=\"M10\" data-d=\"10\" data-as=\"58.0\">M10<\/option>\n                    <option value=\"M12\" data-d=\"12\" data-as=\"84.3\">M12<\/option>\n                    <option value=\"M16\" data-d=\"16\" data-as=\"157\" selected>M16<\/option>\n                    <option value=\"M20\" data-d=\"20\" data-as=\"245\">M20<\/option>\n                    <option value=\"M24\" data-d=\"24\" data-as=\"353\">M24<\/option>\n                    <option value=\"M27\" data-d=\"27\" data-as=\"459\">M27<\/option>\n                    <option value=\"M30\" data-d=\"30\" data-as=\"561\">M30<\/option>\n                    <option value=\"M33\" data-d=\"33\" data-as=\"694\">M33<\/option>\n                    <option value=\"M36\" data-d=\"36\" data-as=\"817\">M36<\/option>\n                    <option value=\"M42\" data-d=\"42\" data-as=\"1121\">M42<\/option>\n                    <option value=\"M48\" data-d=\"48\" data-as=\"1473\">M48<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-class\">Property Class<\/label>\n                <select class=\"vc-select\" id=\"vc-class\">\n                    <option value=\"8.8\" data-rp=\"640\">8.8 \u2014 Rp 640 MPa<\/option>\n                    <option value=\"B7\" data-rp=\"720\" selected>ASTM B7 \u2014 Rp 720 MPa<\/option>\n                    <option value=\"10.9\" data-rp=\"940\">10.9 \u2014 Rp 940 MPa<\/option>\n                    <option value=\"L7\" data-rp=\"720\">ASTM L7 \u2014 Rp 720 MPa<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-eta\">Utilization \u03b7 <span class=\"vc-label-hint\">(%)<\/span><\/label><input class=\"vc-input\" type=\"number\" id=\"vc-eta\" step=\"1\" min=\"10\" max=\"100\" value=\"70\"><\/div>\n            <div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-k\">Nut Factor K<\/label>\n                <select class=\"vc-select\" id=\"vc-k\">\n                    <option value=\"0.20\" selected>0.20 \u2014 Dry steel<\/option>\n                    <option value=\"0.18\">0.18 \u2014 Lightly oiled<\/option>\n                    <option value=\"0.15\">0.15 \u2014 MoS\u2082 \/ wax<\/option>\n                    <option value=\"0.12\">0.12 \u2014 Anti-seize<\/option>\n                <\/select>\n            <\/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-sz=\"M16\" data-cls=\"B7\" data-eta=\"70\" data-k=\"0.15\">M16 B7 Lub<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M20\" data-cls=\"B7\" data-eta=\"70\" data-k=\"0.15\">M20 B7 Lub<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M24\" data-cls=\"B7\" data-eta=\"70\" data-k=\"0.15\">M24 B7 Lub<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-sz=\"M30\" data-cls=\"10.9\" data-eta=\"75\" data-k=\"0.12\">M30 10.9 Anti-seize<\/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\">Target Torque<\/div><div class=\"vc-rcard-value\" id=\"vc-r-torque\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Preload Force<\/div><div class=\"vc-rcard-value\" id=\"vc-r-preload\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Yield Load (100%)<\/div><div class=\"vc-rcard-value\" id=\"vc-r-yield\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Stress Area<\/div><div class=\"vc-rcard-value\" id=\"vc-r-as\">\u2014<\/div><\/div>\n            <div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Utilization<\/div><div class=\"vc-rcard-value\" id=\"vc-r-eta\">\u2014<\/div><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n<div class=\"vc-section vc-open\"><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; Formulas<\/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>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\">\n        <h3>Stud Bolt Preload &amp; Torque<\/h3>\n        <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div><div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n        <p>Same equations as standard bolts. For stud bolts, ensure consistent lubrication on nut threads and bearing surface for predictable preload.<\/p>\n        <div class=\"vc-warning-box\"><p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary)\"><strong>\u26a0\ufe0f<\/strong> Torque-based tightening has \u00b125% uncertainty. For critical flange joints, hydraulic tensioning is preferred.<\/p><\/div>\n    <\/div><\/div>\n<\/div>\n<div class=\"vc-section\"><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<\/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>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-related\"><a class=\"vc-related-link\" href=\"\/calculators\/bolt-preload-calculator\/\">Bolt Preload<\/a><a class=\"vc-related-link\" href=\"\/calculators\/hydraulic-wrench-torque\/\">Hydraulic Wrench Torque<\/a><a class=\"vc-related-link\" href=\"\/calculators\/flange-bolt-calculator\/\">Flange Bolt Calculator<\/a><\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-section\"><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\">FAQ<\/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>\n    <div class=\"vc-section-body\"><div class=\"vc-section-inner\"><div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div><\/div><\/div>\n<\/div>\n<div class=\"vc-promo\"><div class=\"vc-promo-text\"><strong>Vibromera<\/strong> \u2014 Professional field balancing instruments.<\/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\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/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 $(id){return document.getElementById(id)}\n    function fmt(n,d){if(isNaN(n)||!isFinite(n))return '\u2014';return n.toFixed(d===undefined?2:d).replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,'')}\n    function calculate(){\n        var sOpt=$('vc-size').selectedOptions[0],cOpt=$('vc-class').selectedOptions[0];\n        var d=parseFloat(sOpt.getAttribute('data-d')),As=parseFloat(sOpt.getAttribute('data-as'));\n        var Rp=parseFloat(cOpt.getAttribute('data-rp'));\n        var eta=parseFloat($('vc-eta').value)\/100,K=parseFloat($('vc-k').value);\n        if(!eta||eta<=0||eta>1){$('vc-results').classList.remove('vc-visible');return}\n        var F=eta*Rp*As,Fy=Rp*As,T=K*d*F\/1000;\n        $('vc-r-torque').innerHTML=fmt(T,0)+' <span class=\"vc-rcard-unit\">N\u00b7m<\/span>';\n        $('vc-r-preload').innerHTML=fmt(F\/1000,1)+' <span class=\"vc-rcard-unit\">kN<\/span>';\n        $('vc-r-yield').innerHTML=fmt(Fy\/1000,1)+' <span class=\"vc-rcard-unit\">kN<\/span>';\n        $('vc-r-as').innerHTML=fmt(As,0)+' <span class=\"vc-rcard-unit\">mm\u00b2<\/span>';\n        $('vc-r-eta').innerHTML=fmt(eta*100,0)+' <span class=\"vc-rcard-unit\">%<\/span>';\n        $('vc-results').classList.add('vc-visible');\n    }\n    document.querySelectorAll('.vc-preset-btn').forEach(function(b){b.addEventListener('click',function(e){e.preventDefault();$('vc-size').value=this.getAttribute('data-sz');$('vc-class').value=this.getAttribute('data-cls');$('vc-eta').value=this.getAttribute('data-eta');$('vc-k').value=this.getAttribute('data-k');calculate()})});\n    $('vc-form').addEventListener('input',calculate);$('vc-form').addEventListener('change',calculate);\n    $('vc-copy-btn').addEventListener('click',function(){var text='Stud Bolt Torque\\nStud: '+$('vc-size').value+' '+$('vc-class').value+'\\nTorque: '+$('vc-r-torque').textContent+'\\nPreload: '+$('vc-r-preload').textContent+'\\nvibromera.eu';if(navigator.clipboard){navigator.clipboard.writeText(text).then(function(){var b=$('vc-copy-btn');b.classList.add('vc-copied');b.innerHTML='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 a stud bolt?',a:'<p>A double-end threaded rod (no head). One end screws into a tapped hole; a nut on the other end provides clamping. Common in flange joints.<\/p>'},{q:'How is stud bolt torque calculated?',a:'<p>T = K \u00d7 d \u00d7 F, same as standard bolts. F = \u03b7 \u00d7 Rp \u00d7 As.<\/p>'},{q:'Why use studs instead of bolts?',a:'<p>Better for: frequent assembly, high temperatures, tapped holes in weak materials, and ASME B16.5 flange connections.<\/p>'},{q:'What is the nut factor K for studs?',a:'<p>Same as bolts: 0.20 dry, 0.15 lubricated, 0.12 anti-seize. Consistent lubrication is critical.<\/p>'},{q:'Should I torque both nuts?',a:'<p>Usually only the free-end nut is torqued. The tapped-end is installed snug first. In through-stud configs, both nuts are torqued in cross-pattern.<\/p>'}];\n    var fl=$('vc-faq-list');faqData.forEach(function(f){fl.innerHTML+='<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+f.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+f.a+'<\/div><\/div><\/div>'});\n    fl.addEventListener('click',function(e){var b=e.target.closest('.vc-faq-q');if(b)b.closest('.vc-faq-item').classList.toggle('vc-open')});\n    function renderFormulas(){try{katex.render('F = \\\\eta \\\\times R_p \\\\times A_s \\\\quad [\\\\text{N}]',$('vc-katex-1'),{displayMode:true,throwOnError:false});katex.render('T = K \\\\times d \\\\times F \\\\quad [\\\\text{N\u00b7mm}]',$('vc-katex-2'),{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>Libreng online na calculator para sa tightening torque ng stud bolt. Ilagay ang sukat ng stud, klase, at mga kondisyon ng friction para makalkula ang target na torque at preload para sa mga double-end stud.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100249","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/calculator\/100249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/calculator\/100249\/revisions"}],"predecessor-version":[{"id":100763,"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/calculator\/100249\/revisions\/100763"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/media?parent=100249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/categories?post=100249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/tl\/wp-json\/wp\/v2\/tags?post=100249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}