{"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\/uz\/calculators\/stud-bolt-torque\/","title":{"rendered":"Stud Bolt Torque Calculator \u2014 Free 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>Free online calculator for stud bolt tightening torque. Enter stud size, class, and friction conditions to calculate target torque and preload for double-end studs.<\/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\/uz\/wp-json\/wp\/v2\/calculator\/100249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/calculator\/100249\/revisions"}],"predecessor-version":[{"id":100763,"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/calculator\/100249\/revisions\/100763"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/media?parent=100249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/categories?post=100249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/uz\/wp-json\/wp\/v2\/tags?post=100249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}