{"id":100259,"date":"2026-02-15T20:30:16","date_gmt":"2026-02-15T20:30:16","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100259"},"modified":"2026-02-15T20:30:16","modified_gmt":"2026-02-15T20:30:16","slug":"thread-size-converter","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/bn\/calculators\/thread-size-converter\/","title":{"rendered":"\u09a5\u09cd\u09b0\u09c7\u09a1 \u09b8\u09be\u0987\u099c \u0995\u09a8\u09ad\u09be\u09b0\u09cd\u099f\u09be\u09b0 | \u09ae\u09c7\u099f\u09cd\u09b0\u09bf\u0995 \u2194 UNC \u2194 UNF \u2194 BSW | \u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Thread Size Converter\",\"alternateName\":[\"Thread Cross Reference\",\"Metric to Inch Thread\",\"Thread Chart\"],\"description\":\"Free online thread size converter. Cross-reference between metric (ISO), UNC, UNF, and BSW thread standards. Includes pitch, TPI, nominal diameter, and stress area data.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/thread-size-converter\/\",\"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,\"featureList\":[\"Metric ISO threads M3\u2013M30\",\"UNC thread equivalents\",\"UNF thread equivalents\",\"BSW (Whitworth) threads\",\"Search and filter\",\"Closest equivalent highlighting\",\"Stress area data\"],\"keywords\":\"thread converter, metric thread, UNC, UNF, BSW, Whitworth, thread pitch, TPI\"}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"Are metric and inch threads interchangeable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Metric and inch threads are NOT interchangeable, even when the diameters are similar. The thread pitch and flank angle differ. Metric threads use a 60\u00b0 angle with pitch in mm. UNC\/UNF also use 60\u00b0 but with TPI (threads per inch). BSW uses a 55\u00b0 angle. Forcing a wrong thread will damage both bolt and nut.\"}},\n{\"@type\":\"Question\",\"name\":\"How to identify thread type?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Use a thread pitch gauge to measure the pitch. Measure the major diameter with calipers. If pitch is in whole mm values (0.5, 0.7, 1.0, 1.25, 1.5, 2.0, etc.), it's likely metric. Count threads per inch for imperial. Check if the thread angle is 60\u00b0 (metric\/unified) or 55\u00b0 (BSW\/BSP).\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between pitch and TPI?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Pitch is the distance between adjacent thread crests in millimeters (used for metric threads). TPI (Threads Per Inch) is the number of threads in one inch (used for imperial threads). They are inversely related: Pitch (mm) = 25.4 \/ TPI.\"}},\n{\"@type\":\"Question\",\"name\":\"What is BSW thread?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"BSW (British Standard Whitworth) is a thread standard developed by Sir Joseph Whitworth in 1841. It uses a 55\u00b0 thread angle (vs 60\u00b0 for metric and unified). BSW has largely been replaced by metric and unified standards but is still found in legacy equipment, plumbing (BSP), and some British machinery.\"}},\n{\"@type\":\"Question\",\"name\":\"What is the difference between UNC and UNF?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"UNC (Unified National Coarse) has fewer threads per inch \u2014 it's the standard\/default thread. UNF (Unified National Fine) has more threads per inch for the same diameter. UNF provides: better vibration resistance, higher tensile strength per diameter, finer adjustment capability. UNC is preferred for: general assembly, tapped holes in softer materials, and ease of assembly.\"}}\n]}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[\n{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},\n{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},\n{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Thread Size Converter\",\"item\":\"https:\/\/vibromera.eu\/calculators\/thread-size-converter\/\"}\n]}\n<\/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 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\">\n\n<link rel=\"stylesheet\" href=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.css\">\n\n<style>\n:root {\n    --vc-bg: #f4f1ec;\n    --vc-surface: #ffffff;\n    --vc-surface-alt: #f8f6f2;\n    --vc-ink: #1a1a1a;\n    --vc-ink-secondary: #5a5650;\n    --vc-ink-muted: #8a857e;\n    --vc-accent: #c85a2a;\n    --vc-accent-hover: #b04d22;\n    --vc-accent-light: #fdf0ea;\n    --vc-blue: #2a5c8c;\n    --vc-blue-light: #eaf1f8;\n    --vc-green: #2a7a4b;\n    --vc-green-light: #eaf8ef;\n    --vc-yellow: #a67c00;\n    --vc-yellow-light: #fef9e8;\n    --vc-red: #b91c1c;\n    --vc-red-light: #fef2f2;\n    --vc-border: #d9d4cc;\n    --vc-border-light: #e8e4dd;\n    --vc-shadow: 0 1px 3px rgba(26,26,26,0.06), 0 4px 12px rgba(26,26,26,0.04);\n    --vc-shadow-lg: 0 4px 12px rgba(26,26,26,0.08), 0 16px 40px rgba(26,26,26,0.06);\n    --vc-radius: 8px;\n    --vc-radius-lg: 12px;\n    --vc-font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;\n    --vc-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;\n    --vc-display: 'Fraunces', Georgia, serif;\n}\n\n.vc-calculator {\n    font-family: var(--vc-font);\n    font-size: 15px;\n    line-height: 1.65;\n    color: var(--vc-ink);\n    max-width: 960px;\n    margin: 0 auto;\n    padding: 20px 16px 40px;\n    -webkit-font-smoothing: antialiased;\n}\n.vc-calculator *, .vc-calculator *::before, .vc-calculator *::after { box-sizing: border-box; }\n\n\/* \u2500\u2500 HEADER \u2500\u2500 *\/\n.vc-header { text-align: center; padding: 48px 24px 40px; position: relative; }\n.vc-header::after { content:''; position:absolute; bottom:0; left:50%; transform:translateX(-50%); width:80px; height:3px; background:var(--vc-accent); border-radius:2px; }\n.vc-header-eyebrow { font-family:var(--vc-mono); font-size:11px; font-weight:500; letter-spacing:0.15em; text-transform:uppercase; color:var(--vc-accent); margin:0 0 12px; }\n.vc-header-title { font-family:var(--vc-display); font-size:clamp(24px,4vw,36px); font-weight:800; line-height:1.15; color:var(--vc-ink); margin:0 0 16px; letter-spacing:-0.02em; }\n.vc-header-subtitle { font-size:15px; color:var(--vc-ink-secondary); margin:0 auto 20px; max-width:600px; }\n.vc-badges { display:inline-flex; gap:8px; flex-wrap:wrap; justify-content:center; }\n.vc-badge { font-family:var(--vc-mono); font-size:11px; font-weight:500; padding:4px 10px; border-radius:4px; background:var(--vc-surface); border:1px solid var(--vc-border); color:var(--vc-ink-secondary); }\n\n\/* \u2500\u2500 CARD \u2500\u2500 *\/\n.vc-card { background:var(--vc-surface); border:1px solid var(--vc-border); border-radius:var(--vc-radius-lg); box-shadow:var(--vc-shadow); overflow:hidden; margin-top:32px; }\n\n\/* \u2500\u2500 FORM \u2500\u2500 *\/\n.vc-form { padding:24px; }\n.vc-form-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; }\n@media(max-width:600px) { .vc-form-grid { grid-template-columns:1fr; } }\n.vc-field { display:flex; flex-direction:column; }\n.vc-field-full { grid-column: 1 \/ -1; }\n.vc-label { font-size:12px; font-weight:600; letter-spacing:0.04em; text-transform:uppercase; color:var(--vc-ink-secondary); margin-bottom:6px; }\n.vc-label-hint { font-weight:400; text-transform:none; letter-spacing:0; color:var(--vc-ink-muted); font-size:11px; }\n.vc-select, .vc-input { width:100%; padding:10px 12px; border:1.5px solid var(--vc-border); border-radius:6px; font-family:var(--vc-font); font-size:14px; color:var(--vc-ink); background:var(--vc-surface); transition:border-color 0.15s, box-shadow 0.15s; }\n.vc-select { padding-right:36px; appearance:none; -webkit-appearance:none; cursor:pointer; background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' width='16' height='16' fill='none' stroke='%235a5650' stroke-width='2'%3E%3Cpath d='M4 6l4 4 4-4'\/%3E%3C\/svg%3E\"); background-repeat:no-repeat; background-position:right 10px center; }\n.vc-select:focus, .vc-input:focus { outline:none; border-color:var(--vc-accent); box-shadow:0 0 0 3px rgba(200,90,42,0.12); }\n.vc-select:hover, .vc-input:hover { border-color:var(--vc-ink-muted); }\n\n\/* \u2500\u2500 PRESETS \u2500\u2500 *\/\n.vc-presets { display:flex; flex-wrap:wrap; gap:8px; margin-top:18px; padding-top:18px; border-top:1px solid var(--vc-border-light); }\n.vc-presets-label { font-family:var(--vc-mono); font-size:11px; font-weight:500; letter-spacing:0.1em; text-transform:uppercase; color:var(--vc-ink-muted); width:100%; margin-bottom:2px; }\n.vc-preset-btn { padding:5px 12px; font-family:var(--vc-font); font-size:12px; font-weight:500; border:1px solid var(--vc-border); border-radius:6px; background:var(--vc-surface-alt); color:var(--vc-ink-secondary); cursor:pointer; transition:all 0.15s; }\n.vc-preset-btn:hover { border-color:var(--vc-accent); color:var(--vc-accent); background:var(--vc-accent-light); }\n\n\/* \u2500\u2500 RESULTS TABLE \u2500\u2500 *\/\n.vc-results { border-top:1px solid var(--vc-border-light); background:var(--vc-surface-alt); padding:0; max-height:0; overflow:hidden; transition:max-height 0.5s cubic-bezier(0.4,0,0.2,1), padding 0.3s; }\n.vc-results.vc-visible { max-height:5000px; padding:24px; }\n.vc-results-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:18px; }\n.vc-results-title { font-family:var(--vc-display); font-size:20px; font-weight:700; color:var(--vc-ink); margin:0; }\n.vc-copy-btn { display:inline-flex; align-items:center; gap:5px; padding:6px 12px; border:1px solid var(--vc-border); border-radius:6px; background:var(--vc-surface); font-family:var(--vc-font); font-size:12px; font-weight:500; color:var(--vc-ink-secondary); cursor:pointer; transition:all 0.15s; }\n.vc-copy-btn:hover { border-color:var(--vc-accent); color:var(--vc-accent); }\n.vc-copy-btn.vc-copied { background:var(--vc-green-light); border-color:var(--vc-green); color:var(--vc-green); }\n\n.vc-result-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:20px; }\n@media(max-width:500px) { .vc-result-grid { grid-template-columns:1fr; } }\n.vc-rcard { background:var(--vc-surface); border:1px solid var(--vc-border-light); border-radius:var(--vc-radius); padding:16px; transition:transform 0.2s; }\n.vc-rcard:hover { transform:translateY(-1px); }\n.vc-rcard-primary { border-color:var(--vc-accent); border-width:2px; background:linear-gradient(135deg, #fdf6f2 0%, var(--vc-surface) 100%); grid-column:1 \/ -1; }\n.vc-rcard-label { font-family:var(--vc-mono); font-size:10px; font-weight:500; letter-spacing:0.1em; text-transform:uppercase; color:var(--vc-ink-muted); margin-bottom:4px; }\n.vc-rcard-value { font-family:var(--vc-mono); font-size:22px; font-weight:600; color:var(--vc-ink); line-height:1.2; }\n.vc-rcard-primary .vc-rcard-value { font-size:30px; color:var(--vc-accent); }\n.vc-rcard-unit { font-size:14px; font-weight:400; color:var(--vc-ink-secondary); }\n\n\/* \u2500\u2500 THREAD TABLE \u2500\u2500 *\/\n.vc-thread-table-wrap { overflow-x:auto; margin-top:12px; border-radius:var(--vc-radius); border:1px solid var(--vc-border-light); }\n.vc-thread-table { width:100%; border-collapse:collapse; font-size:13px; min-width:700px; }\n.vc-thread-table th, .vc-thread-table td { padding:10px 10px; border:1px solid var(--vc-border-light); text-align:center; white-space:nowrap; }\n.vc-thread-table th { background:var(--vc-surface-alt); font-family:var(--vc-mono); font-size:10px; font-weight:600; text-transform:uppercase; letter-spacing:0.05em; color:var(--vc-ink-secondary); position:sticky; top:0; z-index:2; }\n.vc-thread-table tr:nth-child(even) { background:var(--vc-surface-alt); }\n.vc-thread-table tr:hover { background:var(--vc-accent-light); }\n.vc-thread-table tr.vc-highlight { background:var(--vc-accent-light) !important; outline:2px solid var(--vc-accent); outline-offset:-1px; }\n.vc-thread-table tr.vc-highlight td { font-weight:600; color:var(--vc-ink); }\n.vc-thread-table td.vc-dim { color:var(--vc-ink-muted); }\n@media(max-width:600px) { .vc-thread-table { font-size:11px; } .vc-thread-table th, .vc-thread-table td { padding:7px 6px; } }\n\n.vc-no-results { text-align:center; padding:24px; color:var(--vc-ink-muted); font-size:14px; }\n\n\/* \u2500\u2500 COLLAPSIBLE SECTIONS \u2500\u2500 *\/\n.vc-section { margin-top:24px; border:1px solid var(--vc-border); border-radius:var(--vc-radius-lg); background:var(--vc-surface); box-shadow:var(--vc-shadow); overflow:hidden; }\n.vc-section-toggle { width:100%; display:flex; align-items:center; justify-content:space-between; padding:18px 24px; border:none; background:transparent; cursor:pointer; font-family:var(--vc-font); text-align:left; transition:background 0.15s; }\n.vc-section-toggle:hover { background:var(--vc-surface-alt); }\n.vc-section-toggle-text { display:flex; align-items:center; gap:10px; }\n.vc-section-icon { font-size:20px; line-height:1; }\n.vc-section-title { font-family:var(--vc-display); font-size:18px; font-weight:700; color:var(--vc-ink); margin:0; }\n.vc-section-chevron { width:20px; height:20px; color:var(--vc-ink-muted); transition:transform 0.3s; flex-shrink:0; }\n.vc-section.vc-open .vc-section-chevron { transform:rotate(180deg); }\n.vc-section-body { max-height:0; overflow:hidden; transition:max-height 0.4s cubic-bezier(0.4,0,0.2,1); }\n.vc-section.vc-open .vc-section-body { max-height:20000px; }\n.vc-section-inner { padding:0 24px 24px; border-top:1px solid var(--vc-border-light); }\n\n\/* \u2500\u2500 THEORY \u2500\u2500 *\/\n.vc-theory h3 { font-family:var(--vc-display); font-size:17px; font-weight:700; color:var(--vc-ink); margin:28px 0 10px; }\n.vc-theory h3:first-child { margin-top:20px; }\n.vc-theory p { font-size:14px; color:var(--vc-ink-secondary); margin:0 0 10px; }\n.vc-theory ul, .vc-theory ol { font-size:14px; color:var(--vc-ink-secondary); margin:0 0 12px 18px; padding:0; }\n.vc-theory li { margin-bottom:5px; }\n.vc-formula-box { background:var(--vc-surface-alt); border:2px solid var(--vc-border); border-radius:6px; padding:14px 20px; font-family:var(--vc-mono); font-size:16px; font-weight:500; text-align:center; margin:14px 0; color:var(--vc-ink); overflow-x:auto; }\n.vc-info-box { background:var(--vc-blue-light); border-left:3px solid var(--vc-blue); padding:14px 16px; border-radius:0 6px 6px 0; margin:14px 0; }\n.vc-info-box p { margin:0; font-size:14px; color:var(--vc-ink-secondary); }\n.vc-warning-box { background:var(--vc-yellow-light); border-left:3px solid var(--vc-yellow); padding:14px 16px; border-radius:0 6px 6px 0; margin:14px 0; }\n.vc-example-box { background:var(--vc-surface-alt); border:1px solid var(--vc-border-light); border-radius:6px; padding:16px; margin:14px 0; }\n.vc-example-title { font-family:var(--vc-mono); font-size:13px; font-weight:600; color:var(--vc-accent); margin-bottom:8px; }\n.vc-table { width:100%; border-collapse:collapse; margin:14px 0; font-size:13px; }\n.vc-table th, .vc-table td { padding:10px 12px; border:1px solid var(--vc-border-light); text-align:left; }\n.vc-table th { background:var(--vc-surface-alt); font-size:11px; font-weight:600; text-transform:uppercase; letter-spacing:0.05em; color:var(--vc-ink-secondary); }\n.vc-table tr:nth-child(even) { background:var(--vc-surface-alt); }\n@media(max-width:600px) { .vc-table { font-size:12px; } .vc-table th, .vc-table td { padding:8px; } }\n\n\/* \u2500\u2500 FAQ \u2500\u2500 *\/\n.vc-faq-list { display:flex; flex-direction:column; gap:8px; margin-top:20px; }\n.vc-faq-item { border:1px solid var(--vc-border-light); border-radius:6px; overflow:hidden; }\n.vc-faq-q { width:100%; display:flex; align-items:center; justify-content:space-between; gap:12px; padding:14px 16px; border:none; background:var(--vc-surface-alt); cursor:pointer; font-family:var(--vc-font); font-size:15px; font-weight:600; color:var(--vc-ink); text-align:left; transition:background 0.15s; }\n.vc-faq-q:hover { background:#ede9e3; }\n.vc-faq-chevron { width:16px; height:16px; color:var(--vc-ink-muted); flex-shrink:0; transition:transform 0.25s; }\n.vc-faq-item.vc-open .vc-faq-chevron { transform:rotate(180deg); }\n.vc-faq-a { max-height:0; overflow:hidden; transition:max-height 0.35s; }\n.vc-faq-item.vc-open .vc-faq-a { max-height:1200px; }\n.vc-faq-a-inner { padding:14px 16px; border-top:1px solid var(--vc-border-light); font-size:14px; color:var(--vc-ink-secondary); }\n.vc-faq-a-inner p { margin:0 0 8px; }\n.vc-faq-a-inner p:last-child { margin-bottom:0; }\n.vc-faq-a-inner ul { margin:4px 0 8px 16px; padding:0; }\n.vc-faq-a-inner li { margin-bottom:3px; }\n\n\/* \u2500\u2500 RELATED \u2500\u2500 *\/\n.vc-related { display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }\n.vc-related-link { display:inline-block; padding:8px 16px; font-family:var(--vc-font); font-size:13px; font-weight:600; background:var(--vc-surface-alt); color:var(--vc-ink-secondary); border:1px solid var(--vc-border); border-radius:var(--vc-radius); text-decoration:none; transition:all 0.15s; }\n.vc-related-link:hover { border-color:var(--vc-accent); color:var(--vc-accent); background:var(--vc-accent-light); }\n\n\/* \u2500\u2500 PROMO \u2500\u2500 *\/\n.vc-promo { margin-top:24px; padding:20px; background:linear-gradient(135deg, var(--vc-accent-light), var(--vc-surface)); border:1px solid var(--vc-border); border-radius:var(--vc-radius-lg); display:flex; align-items:center; gap:16px; }\n.vc-promo-text { flex:1; font-size:14px; color:var(--vc-ink-secondary); }\n.vc-promo-text strong { color:var(--vc-ink); }\n.vc-promo-link { padding:8px 20px; font-size:13px; font-weight:700; color:#fff; background:var(--vc-accent); border-radius:var(--vc-radius); text-decoration:none; white-space:nowrap; transition:background 0.15s; }\n.vc-promo-link:hover { background:var(--vc-accent-hover); }\n\n\/* \u2500\u2500 FOOTER \u2500\u2500 *\/\n.vc-footer { text-align:center; padding:32px 16px; font-size:13px; color:var(--vc-ink-muted); }\n.vc-footer a { color:var(--vc-accent); text-decoration:none; }\n.vc-footer a:hover { text-decoration:underline; }\n.vc-footer-links { margin-top:8px; font-size:12px; }\n.vc-footer-links a { margin:0 8px; }\n\n\/* \u2500\u2500 PRINT \u2500\u2500 *\/\n@media print {\n    .vc-section-body { max-height:none!important; }\n    .vc-faq-a { max-height:none!important; }\n    .vc-results { max-height:none!important; padding:24px!important; }\n    .vc-copy-btn, .vc-section-chevron, .vc-faq-chevron, .vc-presets, .vc-promo { display:none!important; }\n}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-thread-converter\">\n\n<!-- Header -->\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Thread Size Converter<\/h1>\n    <p class=\"vc-header-subtitle\">Cross-reference between metric (ISO), UNC, UNF, and BSW thread sizes. Search by any thread designation or select a metric size to find the closest equivalents.<\/p>\n    <div class=\"vc-badges\">\n        <span class=\"vc-badge\">Metric ISO<\/span>\n        <span class=\"vc-badge\">UNC \/ UNF<\/span>\n        <span class=\"vc-badge\">BSW Whitworth<\/span>\n    <\/div>\n<\/header>\n\n<!-- Calculator Card -->\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\">\n                <label class=\"vc-label\" for=\"vc-search\">Search \/ Filter <span class=\"vc-label-hint\">(e.g. M8, 1\/2, UNC, 5\/16)<\/span><\/label>\n                <input class=\"vc-input\" type=\"text\" id=\"vc-search\" placeholder=\"Type to search any thread size...\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-metric-select\">Or Select Metric Size<\/label>\n                <select class=\"vc-select\" id=\"vc-metric-select\">\n                    <option value=\"\">\u2014 Show all \u2014<\/option>\n                    <option value=\"M3\">M3<\/option>\n                    <option value=\"M4\">M4<\/option>\n                    <option value=\"M5\">M5<\/option>\n                    <option value=\"M6\">M6<\/option>\n                    <option value=\"M8\" selected>M8<\/option>\n                    <option value=\"M10\">M10<\/option>\n                    <option value=\"M12\">M12<\/option>\n                    <option value=\"M14\">M14<\/option>\n                    <option value=\"M16\">M16<\/option>\n                    <option value=\"M20\">M20<\/option>\n                    <option value=\"M24\">M24<\/option>\n                    <option value=\"M30\">M30<\/option>\n                <\/select>\n            <\/div>\n        <\/div>\n\n        <!-- Presets -->\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-metric=\"M8\">M8<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-metric=\"M12\">M12<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-search=\"1\/2\">1\/2 inch<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-metric=\"M16\">M16<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-metric=\"M6\">M6<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-search=\"\">Show All<\/button>\n        <\/div>\n    <\/form>\n\n    <!-- Results -->\n    <div class=\"vc-results vc-visible\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Thread Cross-Reference<\/h2>\n            <button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">\n                <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>\n                Copy\n            <\/button>\n        <\/div>\n\n        <!-- Highlight cards for selected thread -->\n        <div class=\"vc-result-grid\" id=\"vc-result-cards\" style=\"display:none\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">Selected Thread<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-selected\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Closest UNC<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-unc\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Closest UNF<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-unf\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Closest BSW<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-bsw\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Nominal \u00d8<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-dia\">\u2014<\/div>\n            <\/div>\n        <\/div>\n\n        <!-- Full cross-reference table -->\n        <div class=\"vc-thread-table-wrap\">\n            <table class=\"vc-thread-table\" id=\"vc-thread-table\">\n                <thead>\n                    <tr>\n                        <th>Metric<\/th>\n                        <th>\u00d8 mm<\/th>\n                        <th>Pitch mm<\/th>\n                        <th>UNC<\/th>\n                        <th>UNF<\/th>\n                        <th>BSW<\/th>\n                        <th>Stress Area mm\u00b2<\/th>\n                    <\/tr>\n                <\/thead>\n                <tbody id=\"vc-table-body\"><\/tbody>\n            <\/table>\n        <\/div>\n        <div class=\"vc-no-results\" id=\"vc-no-results\" style=\"display:none\">No matching threads found. Try a different search term.<\/div>\n    <\/div>\n<\/div>\n\n<!-- Theory & Reference -->\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udcd8<\/span>\n            <span class=\"vc-section-title\">Theory &amp; Thread Standards<\/span>\n        <\/span>\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>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner vc-theory\">\n            <h3>Thread Standards Overview<\/h3>\n            <p>The four main thread standards used worldwide:<\/p>\n            <ul>\n                <li><strong>Metric (ISO 261\/262)<\/strong> \u2014 Designated M + diameter (e.g. M8). Pitch in mm. 60\u00b0 thread angle. Most common worldwide.<\/li>\n                <li><strong>UNC (Unified National Coarse)<\/strong> \u2014 Diameter-TPI format (e.g. 5\/16-18). 60\u00b0 angle. Standard coarse pitch for USA\/Canada.<\/li>\n                <li><strong>UNF (Unified National Fine)<\/strong> \u2014 Same system as UNC but with finer pitch (more TPI). Better vibration resistance.<\/li>\n                <li><strong>BSW (British Standard Whitworth)<\/strong> \u2014 55\u00b0 thread angle. Diameter in inches with TPI. Legacy standard, still found in older equipment.<\/li>\n            <\/ul>\n\n            <h3>Pitch vs TPI Conversion<\/h3>\n            <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n            <p>For example: M8 \u00d7 1.25 mm pitch = 25.4 \/ 1.25 = 20.32 TPI (not a standard TPI, confirming it&#8217;s not directly interchangeable with any inch thread).<\/p>\n\n            <h3>Stress Area<\/h3>\n            <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n            <p>Where d is the nominal diameter and P is the pitch. Stress area is used to calculate bolt tensile and proof loads.<\/p>\n\n            <div class=\"vc-warning-box\">\n                <p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary);\"><strong>\u26a0\ufe0f Important:<\/strong> &#8220;Closest equivalent&#8221; does NOT mean interchangeable. Metric and inch threads have different pitches even when diameters are similar. Never force a metric bolt into an inch-tapped hole or vice versa \u2014 this will damage both components.<\/p>\n            <\/div>\n\n            <div class=\"vc-info-box\">\n                <p><strong>\u2139\ufe0f Tip:<\/strong> To identify an unknown thread: (1) Measure the major diameter with calipers. (2) Use a thread pitch gauge to determine pitch or TPI. (3) Cross-reference in the table above.<\/p>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Related Calculators -->\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udd17<\/span>\n            <span class=\"vc-section-title\">Related Calculators<\/span>\n        <\/span>\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>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-related\">\n                <a class=\"vc-related-link\" href=\"\/calculators\/belt-tension-calculator\/\">Belt Tension Calculator<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/power-unit-converter\/\">Power Unit Converter<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/residual-unbalance-iso1940\/\">Residual Unbalance (ISO 1940)<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/vibration-velocity\/\">Vibration Velocity (ISO 10816)<\/a>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- FAQ -->\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\u2753<\/span>\n            <span class=\"vc-section-title\">Frequently Asked Questions<\/span>\n        <\/span>\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>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Promo -->\n<div class=\"vc-promo\">\n    <div class=\"vc-promo-text\">\n        <strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>\n        Professional field balancing instruments and vibration analysis software. Precision tools for precision engineering. Used in 50+ countries.\n    <\/div>\n    <a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a>\n<\/div>\n\n<!-- Footer -->\n<footer class=\"vc-footer\">\n    <p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p>\n    <p style=\"font-size:12px;margin-top:4px;\">Thread data per ISO 261\/262, ASME B1.1, BS 84. Last updated: February 2025<\/p>\n    <div class=\"vc-footer-links\">\n        <a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a>\n        <a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a>\n    <\/div>\n<\/footer>\n\n<\/div>\n\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\n    var SLUG = 'thread-size-converter';\n\n    function $(id) { return document.getElementById(id); }\n\n    \/* \u2500\u2500 THREAD DATA \u2500\u2500 *\/\n    var THREADS = [\n        { metric:'M3',   dia:3.0,  pitch:0.5,  stressArea:5.03,   unc:'#5-40 UNC',       uncTPI:40,  uncDia:3.18,  unf:'#5-44 UNF',       unfTPI:44,  unfDia:3.18,  bsw:'\u2014',              bswTPI:0,   bswDia:0 },\n        { metric:'M4',   dia:4.0,  pitch:0.7,  stressArea:8.78,   unc:'#8-32 UNC',       uncTPI:32,  uncDia:4.17,  unf:'#8-36 UNF',       unfTPI:36,  unfDia:4.17,  bsw:'\u2014',              bswTPI:0,   bswDia:0 },\n        { metric:'M5',   dia:5.0,  pitch:0.8,  stressArea:14.18,  unc:'#10-24 UNC',      uncTPI:24,  uncDia:4.83,  unf:'#10-32 UNF',      unfTPI:32,  unfDia:4.83,  bsw:'\u2014',              bswTPI:0,   bswDia:0 },\n        { metric:'M6',   dia:6.0,  pitch:1.0,  stressArea:20.12,  unc:'1\/4\\\"-20 UNC',    uncTPI:20,  uncDia:6.35,  unf:'1\/4\\\"-28 UNF',    unfTPI:28,  unfDia:6.35,  bsw:'1\/4\\\" BSW',      bswTPI:20,  bswDia:6.35 },\n        { metric:'M8',   dia:8.0,  pitch:1.25, stressArea:36.61,  unc:'5\/16\\\"-18 UNC',   uncTPI:18,  uncDia:7.94,  unf:'5\/16\\\"-24 UNF',   unfTPI:24,  unfDia:7.94,  bsw:'5\/16\\\" BSW',     bswTPI:18,  bswDia:7.94 },\n        { metric:'M10',  dia:10.0, pitch:1.5,  stressArea:58.00,  unc:'3\/8\\\"-16 UNC',    uncTPI:16,  uncDia:9.53,  unf:'3\/8\\\"-24 UNF',    unfTPI:24,  unfDia:9.53,  bsw:'3\/8\\\" BSW',      bswTPI:16,  bswDia:9.53 },\n        { metric:'M12',  dia:12.0, pitch:1.75, stressArea:84.27,  unc:'1\/2\\\"-13 UNC',    uncTPI:13,  uncDia:12.70, unf:'1\/2\\\"-20 UNF',    unfTPI:20,  unfDia:12.70, bsw:'1\/2\\\" BSW',      bswTPI:12,  bswDia:12.70 },\n        { metric:'M14',  dia:14.0, pitch:2.0,  stressArea:115.44, unc:'9\/16\\\"-12 UNC',   uncTPI:12,  uncDia:14.29, unf:'9\/16\\\"-18 UNF',   unfTPI:18,  unfDia:14.29, bsw:'\u2014',              bswTPI:0,   bswDia:0 },\n        { metric:'M16',  dia:16.0, pitch:2.0,  stressArea:156.67, unc:'5\/8\\\"-11 UNC',    uncTPI:11,  uncDia:15.88, unf:'5\/8\\\"-18 UNF',    unfTPI:18,  unfDia:15.88, bsw:'5\/8\\\" BSW',      bswTPI:11,  bswDia:15.88 },\n        { metric:'M20',  dia:20.0, pitch:2.5,  stressArea:244.79, unc:'3\/4\\\"-10 UNC',    uncTPI:10,  uncDia:19.05, unf:'3\/4\\\"-16 UNF',    unfTPI:16,  unfDia:19.05, bsw:'3\/4\\\" BSW',      bswTPI:10,  bswDia:19.05 },\n        { metric:'M24',  dia:24.0, pitch:3.0,  stressArea:352.50, unc:'1\\\"-8 UNC',       uncTPI:8,   uncDia:25.40, unf:'1\\\"-12 UNF',      unfTPI:12,  unfDia:25.40, bsw:'1\\\" BSW',        bswTPI:8,   bswDia:25.40 },\n        { metric:'M30',  dia:30.0, pitch:3.5,  stressArea:560.59, unc:'1-1\/4\\\"-7 UNC',   uncTPI:7,   uncDia:31.75, unf:'1-1\/4\\\"-12 UNF',  unfTPI:12,  unfDia:31.75, bsw:'1-1\/4\\\" BSW',    bswTPI:7,   bswDia:31.75 }\n    ];\n\n    \/* \u2500\u2500 RENDER TABLE \u2500\u2500 *\/\n    function renderTable(filter, highlightMetric) {\n        var tbody = $('vc-table-body');\n        var html = '';\n        var count = 0;\n        var filterLower = (filter || '').toLowerCase().trim();\n\n        THREADS.forEach(function(t) {\n            \/\/ Search filter\n            var searchStr = (t.metric + ' ' + t.unc + ' ' + t.unf + ' ' + t.bsw + ' ' + t.dia + ' ' + t.pitch).toLowerCase();\n            if (filterLower && searchStr.indexOf(filterLower) === -1) return;\n\n            var isHighlight = highlightMetric && t.metric === highlightMetric;\n            html += '<tr' + (isHighlight ? ' class=\"vc-highlight\"' : '') + '>';\n            html += '<td><strong>' + t.metric + '<\/strong><\/td>';\n            html += '<td>' + t.dia.toFixed(1) + '<\/td>';\n            html += '<td>' + t.pitch + '<\/td>';\n            html += '<td>' + t.unc + '<\/td>';\n            html += '<td>' + t.unf + '<\/td>';\n            html += '<td' + (t.bsw === '\u2014' ? ' class=\"vc-dim\"' : '') + '>' + t.bsw + '<\/td>';\n            html += '<td>' + t.stressArea.toFixed(1) + '<\/td>';\n            html += '<\/tr>';\n            count++;\n        });\n\n        tbody.innerHTML = html;\n        $('vc-no-results').style.display = count === 0 ? 'block' : 'none';\n        $('vc-thread-table').style.display = count === 0 ? 'none' : '';\n    }\n\n    \/* \u2500\u2500 UPDATE RESULT CARDS \u2500\u2500 *\/\n    function updateCards(metricVal) {\n        var cards = $('vc-result-cards');\n        if (!metricVal) {\n            cards.style.display = 'none';\n            return;\n        }\n\n        var t = null;\n        for (var i = 0; i < THREADS.length; i++) {\n            if (THREADS[i].metric === metricVal) { t = THREADS[i]; break; }\n        }\n        if (!t) { cards.style.display = 'none'; return; }\n\n        cards.style.display = '';\n        $('vc-r-selected').innerHTML = '<span style=\"font-size:26px\">' + t.metric + ' \u00d7 ' + t.pitch + '<\/span> <span class=\"vc-rcard-unit\">mm pitch<\/span>';\n        $('vc-r-unc').innerHTML = '<span style=\"font-size:18px\">' + t.unc + '<\/span>' + (t.uncDia ? ' <span class=\"vc-rcard-unit\">(\u00d8' + t.uncDia.toFixed(2) + ' mm)<\/span>' : '');\n        $('vc-r-unf').innerHTML = '<span style=\"font-size:18px\">' + t.unf + '<\/span>' + (t.unfDia ? ' <span class=\"vc-rcard-unit\">(\u00d8' + t.unfDia.toFixed(2) + ' mm)<\/span>' : '');\n        $('vc-r-bsw').innerHTML = t.bsw !== '\u2014' ? '<span style=\"font-size:18px\">' + t.bsw + '<\/span> <span class=\"vc-rcard-unit\">(' + t.bswTPI + ' TPI)<\/span>' : '<span style=\"font-size:16px;color:var(--vc-ink-muted)\">No close BSW equivalent<\/span>';\n        $('vc-r-dia').innerHTML = t.dia.toFixed(1) + ' <span class=\"vc-rcard-unit\">mm<\/span> <span class=\"vc-rcard-unit\">(stress area: ' + t.stressArea.toFixed(1) + ' mm\u00b2)<\/span>';\n    }\n\n    \/* \u2500\u2500 EVENT HANDLERS \u2500\u2500 *\/\n    function doFilter() {\n        var search = $('vc-search').value;\n        var metric = $('vc-metric-select').value;\n\n        if (search) {\n            renderTable(search, null);\n            updateCards(null);\n        } else if (metric) {\n            renderTable(null, metric);\n            updateCards(metric);\n        } else {\n            renderTable(null, null);\n            updateCards(null);\n        }\n\n        $('vc-results').classList.add('vc-visible');\n    }\n\n    $('vc-search').addEventListener('input', function() {\n        $('vc-metric-select').value = '';\n        doFilter();\n    });\n\n    $('vc-metric-select').addEventListener('change', function() {\n        $('vc-search').value = '';\n        doFilter();\n    });\n\n    \/* \u2500\u2500 PRESETS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn) {\n        btn.addEventListener('click', function(e) {\n            e.preventDefault();\n            var metric = this.getAttribute('data-metric');\n            var search = this.getAttribute('data-search');\n            if (metric) {\n                $('vc-search').value = '';\n                $('vc-metric-select').value = metric;\n            } else if (search !== null) {\n                $('vc-metric-select').value = '';\n                $('vc-search').value = search;\n            }\n            doFilter();\n        });\n    });\n\n    \/* \u2500\u2500 COPY \u2500\u2500 *\/\n    $('vc-copy-btn').addEventListener('click', function() {\n        var metric = $('vc-metric-select').value;\n        var text = 'Thread Size Cross-Reference\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\n';\n\n        if (metric) {\n            text += 'Selected: ' + $('vc-r-selected').textContent + '\\n';\n            text += 'UNC: ' + $('vc-r-unc').textContent + '\\n';\n            text += 'UNF: ' + $('vc-r-unf').textContent + '\\n';\n            text += 'BSW: ' + $('vc-r-bsw').textContent + '\\n';\n            text += 'Diameter: ' + $('vc-r-dia').textContent + '\\n';\n        } else {\n            text += 'Metric | \u00d8 mm | Pitch | UNC | UNF | BSW\\n';\n            THREADS.forEach(function(t) {\n                text += t.metric + ' | ' + t.dia + ' | ' + t.pitch + ' | ' + t.unc + ' | ' + t.unf + ' | ' + t.bsw + '\\n';\n            });\n        }\n\n        text += '\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu\/calculators\/thread-size-converter\/';\n\n        if (navigator.clipboard) {\n            navigator.clipboard.writeText(text).then(function() {\n                var btn = $('vc-copy-btn');\n                btn.classList.add('vc-copied');\n                btn.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!';\n                setTimeout(function() {\n                    btn.classList.remove('vc-copied');\n                    btn.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';\n                }, 2000);\n            });\n        }\n    });\n\n    \/* \u2500\u2500 COLLAPSIBLE SECTIONS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn) {\n        btn.addEventListener('click', function() {\n            var section = this.closest('.vc-section');\n            var isOpen = section.classList.contains('vc-open');\n            section.classList.toggle('vc-open');\n            this.setAttribute('aria-expanded', !isOpen);\n        });\n    });\n\n    \/* \u2500\u2500 FAQ \u2500\u2500 *\/\n    var faqData = [\n        { q: 'Are metric and inch threads interchangeable?', a: '<p><strong>No.<\/strong> Metric and inch threads are NOT interchangeable, even when the diameters appear similar. The key differences:<\/p><ul><li><strong>Pitch:<\/strong> Metric uses mm pitch; UNC\/UNF uses TPI \u2014 they never match exactly<\/li><li><strong>Thread angle:<\/strong> Both metric and unified use 60\u00b0, but BSW uses 55\u00b0<\/li><li><strong>Root\/crest:<\/strong> Different profiles even at the same angle<\/li><\/ul><p>Forcing the wrong thread will strip the threads and damage both components. Always verify with a thread gauge.<\/p>' },\n        { q: 'How to identify thread type?', a: '<p>Step-by-step identification:<\/p><ol><li><strong>Measure major diameter<\/strong> with calipers (mm or inches)<\/li><li><strong>Use a thread pitch gauge<\/strong> to determine pitch (mm) or TPI (threads per inch)<\/li><li><strong>Check the thread angle:<\/strong> 60\u00b0 = metric or unified; 55\u00b0 = Whitworth\/BSP<\/li><li><strong>Cross-reference<\/strong> in the table above to confirm the standard<\/li><\/ol><p>If the pitch is a clean mm value (0.5, 0.7, 1.0, 1.25, 1.5, 2.0, 2.5, 3.0), it\\'s almost certainly metric.<\/p>' },\n        { q: 'What is the difference between pitch and TPI?', a: '<p><strong>Pitch<\/strong> is the distance between adjacent thread crests, measured in millimeters. Used for metric threads.<\/p><p><strong>TPI<\/strong> (Threads Per Inch) is the number of complete thread crests in one inch. Used for imperial threads.<\/p><p>Conversion: <strong>Pitch (mm) = 25.4 \/ TPI<\/strong><\/p><p>Examples: 20 TPI = 1.27 mm pitch, 18 TPI = 1.411 mm pitch, 16 TPI = 1.5875 mm pitch.<\/p>' },\n        { q: 'What is BSW thread?', a: '<p><strong>BSW<\/strong> (British Standard Whitworth) was the world\\'s first national standard thread, created by Sir Joseph Whitworth in 1841.<\/p><p>Key features:<\/p><ul><li>55\u00b0 thread angle (vs 60\u00b0 for metric\/unified)<\/li><li>Rounded roots and crests<\/li><li>Diameter in inches, pitch in TPI<\/li><\/ul><p>BSW has been largely replaced by metric and unified standards but is still found in legacy machinery, plumbing (BSP is related), and some British equipment.<\/p>' },\n        { q: 'What is the difference between UNC and UNF?', a: '<p><strong>UNC<\/strong> (Unified National Coarse) \u2014 the standard\/default thread:<\/p><ul><li>Fewer threads per inch \u2192 faster assembly<\/li><li>More forgiving for tapped holes in soft materials<\/li><li>Less likely to cross-thread<\/li><\/ul><p><strong>UNF<\/strong> (Unified National Fine) \u2014 the fine-pitch variant:<\/p><ul><li>More threads per inch \u2192 higher tensile strength<\/li><li>Better vibration resistance (self-locking effect)<\/li><li>Finer adjustment capability<\/li><li>Requires more precise tapping<\/li><\/ul><p>Rule of thumb: Use UNC for general assembly, UNF for precision and vibration-prone applications.<\/p>' }\n    ];\n\n    var faqList = $('vc-faq-list');\n    faqData.forEach(function(faq) {\n        faqList.innerHTML += '<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>' + faq.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\">' + faq.a + '<\/div><\/div><\/div>';\n    });\n    faqList.addEventListener('click', function(e) {\n        var btn = e.target.closest('.vc-faq-q');\n        if (!btn) return;\n        btn.closest('.vc-faq-item').classList.toggle('vc-open');\n    });\n\n    \/* \u2500\u2500 KATEX \u2500\u2500 *\/\n    function renderFormulas() {\n        try {\n            katex.render('\\\\text{Pitch (mm)} = \\\\frac{25.4}{\\\\text{TPI}}', $('vc-katex-1'), { displayMode: true, throwOnError: false });\n            katex.render('A_s = \\\\frac{\\\\pi}{4} \\\\left( d - \\\\frac{0.9382}{\\\\text{TPI}} \\\\right)^2 \\\\approx \\\\frac{\\\\pi}{4} \\\\left( d - 0.9382\\\\,P \\\\right)^2', $('vc-katex-2'), { displayMode: true, throwOnError: false });\n        } catch(e) {}\n    }\n\n    \/* \u2500\u2500 INIT \u2500\u2500 *\/\n    function init() {\n        renderFormulas();\n        doFilter();\n    }\n\n    if (document.readyState === 'loading') {\n        document.addEventListener('DOMContentLoaded', init);\n    } else {\n        init();\n    }\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u09ac\u09bf\u09a8\u09be\u09ae\u09c2\u09b2\u09cd\u09af\u09c7 \u0985\u09a8\u09b2\u09be\u0987\u09a8 \u09a5\u09cd\u09b0\u09c7\u09a1 \u0986\u0995\u09be\u09b0 \u0995\u09a8\u09ad\u09be\u09b0\u09cd\u099f\u09be\u09b0\u0964 \u09ae\u09c7\u099f\u09cd\u09b0\u09bf\u0995 (M), UNC, UNF \u098f\u09ac\u0982 BSW \u09a5\u09cd\u09b0\u09c7\u09a1 \u0986\u0995\u09be\u09b0 \u0995\u09cd\u09b0\u09b8-\u09b0\u09c7\u09ab\u09be\u09b0\u09c7\u09a8\u09cd\u09b8 \u0995\u09b0\u09c1\u09a8\u0964 \u09aa\u09bf\u099a, TPI \u098f\u09ac\u0982 \u09b8\u09cd\u099f\u09cd\u09b0\u09c7\u09b8 \u098f\u09b0\u09bf\u09af\u09bc\u09be \u09a1\u09c7\u099f\u09be \u09b8\u09b9 \u09b8\u09ae\u09a4\u09c1\u09b2\u09cd\u09af \u09a5\u09cd\u09b0\u09c7\u09a1 \u0986\u0995\u09be\u09b0 \u0985\u09a8\u09c1\u09b8\u09a8\u09cd\u09a7\u09be\u09a8, \u09ab\u09bf\u09b2\u09cd\u099f\u09be\u09b0 \u098f\u09ac\u0982 \u0996\u09c1\u0981\u099c\u09c7 \u09aa\u09be\u09a8\u0964<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100259","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100259\/revisions"}],"predecessor-version":[{"id":100572,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/calculator\/100259\/revisions\/100572"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=100259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=100259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=100259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}