{"id":130,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/g-grade\/"},"modified":"2026-06-08T04:12:22","modified_gmt":"2026-06-08T04:12:22","slug":"g-grade","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/mn\/glossary\/g-grade\/","title":{"rendered":"What are Balance Quality Grades (G-Grades)?"},"content":{"rendered":"<style>\n:root {\n  --navy: #0a2540;\n  --navy-light: #1a3a5c;\n  --blue: #2563eb;\n  --blue-light: #3b82f6;\n  --blue-pale: #dbeafe;\n  --blue-ghost: #eff6ff;\n  --beige: #f5f0e8;\n  --beige-dark: #e8dfd3;\n  --beige-light: #faf7f2;\n  --white: #ffffff;\n  --text: #1e293b;\n  --text-secondary: #475569;\n  --text-muted: #94a3b8;\n  --border: #cbd5e1;\n  --border-light: #e2e8f0;\n  --success: #059669;\n  --success-light: #d1fae5;\n  --warning: #d97706;\n  --warning-light: #fef3c7;\n  --danger: #dc2626;\n  --danger-light: #fee2e2;\n  --shadow-sm: 0 1px 3px rgba(10,37,64,0.08);\n  --shadow-md: 0 4px 12px rgba(10,37,64,0.1);\n  --shadow-lg: 0 8px 30px rgba(10,37,64,0.12);\n  --radius: 12px;\n  --radius-sm: 8px;\n  --radius-lg: 16px;\n}<\/p>\n<p>* { margin: 0; padding: 0; box-sizing: border-box; }<\/p>\n<p>body {\n  font-family: 'Source Sans 3', sans-serif;\n  color: var(--text);\n  background: var(--beige-light);\n  min-width: 1200px;\n  line-height: 1.7;\n  font-size: 16px;\n  -webkit-font-smoothing: antialiased;\n}<\/p>\n<p>\/* ===== HERO ===== *\/\n.hero {\n  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 50%, #234e7a 100%);\n  color: var(--white);\n  padding: 56px 0 48px;\n  position: relative;\n  overflow: hidden;\n}\n.hero::before {\n  content: '';\n  position: absolute; inset: 0;\n  background:\n    radial-gradient(circle at 15% 75%, rgba(37,99,235,0.15) 0%, transparent 50%),\n    radial-gradient(circle at 85% 25%, rgba(37,99,235,0.1) 0%, transparent 50%);\n  pointer-events: none;\n}\n.hero::after {\n  content: '';\n  position: absolute; inset: 0;\n  background: url(\"data:image\/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http:\/\/www.w3.org\/2000\/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.025'%3E%3Ccircle cx='20' cy='20' r='2'\/%3E%3C\/g%3E%3C\/g%3E%3C\/svg%3E\");\n  pointer-events: none;\n}\n.hero-inner {\n  max-width: 1280px;\n  margin: 0 auto;\n  padding: 0 48px;\n  position: relative;\n  z-index: 1;\n}\n.hero h1 {\n  font-family: 'DM Serif Display', serif;\n  font-size: 46px;\n  font-weight: 400;\n  line-height: 1.15;\n  margin-bottom: 16px;\n  letter-spacing: -0.5px;\n}\n.hero h1 span { color: var(--blue-light); }\n.hero .subtitle {\n  font-size: 19px;\n  font-weight: 300;\n  color: rgba(255,255,255,0.78);\n  max-width: 800px;\n  line-height: 1.6;\n}\n.breadcrumb {\n  margin-bottom: 20px;\n  font-size: 14px;\n  color: rgba(255,255,255,0.5);\n}\n.breadcrumb a {\n  color: rgba(255,255,255,0.6);\n  text-decoration: none;\n}\n.breadcrumb a:hover { color: rgba(255,255,255,0.9); }<\/p>\n<p>\/* ===== QUICK NAV ===== *\/\n.quick-nav {\n  background: var(--white);\n  border-bottom: 1px solid var(--border-light);\n  position: sticky;\n  top: 0;\n  z-index: 100;\n  box-shadow: var(--shadow-sm);\n}\n.quick-nav-inner {\n  max-width: 1280px;\n  margin: 0 auto;\n  padding: 0 48px;\n  display: flex;\n  gap: 0;\n  overflow-x: auto;\n}\n.quick-nav a {\n  display: flex;\n  align-items: center;\n  gap: 6px;\n  padding: 14px 20px;\n  font-size: 14px;\n  font-weight: 500;\n  color: var(--text-secondary);\n  text-decoration: none;\n  white-space: nowrap;\n  border-bottom: 2px solid transparent;\n  transition: all 0.2s;\n}\n.quick-nav a:hover {\n  color: var(--blue);\n  border-bottom-color: var(--blue);\n  background: var(--blue-ghost);\n}<\/p>\n<p>\/* ===== CONTAINER ===== *\/\n.container {\n  max-width: 1280px;\n  margin: 0 auto;\n  padding: 0 48px;\n}<\/p>\n<p>\/* ===== SUMMARY DASHBOARD ===== *\/\n.summary-dashboard {\n  padding: 40px 0;\n  background: var(--white);\n  border-bottom: 1px solid var(--border-light);\n}\n.dashboard-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 32px;\n}<\/p>\n<p>\/* Calculator *\/\n.calc-panel {\n  background: var(--beige-light);\n  border: 1px solid var(--beige-dark);\n  border-radius: var(--radius-lg);\n  padding: 32px;\n  position: relative;\n  overflow: hidden;\n}\n.calc-panel::before {\n  content: '';\n  position: absolute;\n  top: 0; left: 0; right: 0;\n  height: 4px;\n  background: linear-gradient(90deg, var(--blue), var(--blue-light));\n}\n.panel-title {\n  font-family: 'DM Serif Display', serif;\n  font-size: 22px;\n  margin-bottom: 6px;\n  color: var(--navy);\n}\n.panel-subtitle {\n  font-size: 14px;\n  color: var(--text-muted);\n  margin-bottom: 24px;\n}\n.calc-form {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 16px;\n}\n.form-group { display: flex; flex-direction: column; gap: 5px; }\n.form-group.full-width { grid-column: 1 \/ -1; }\n.form-group label {\n  font-size: 13px;\n  font-weight: 600;\n  color: var(--text-secondary);\n  text-transform: uppercase;\n  letter-spacing: 0.5px;\n}\n.form-group label .unit {\n  font-weight: 400;\n  text-transform: none;\n  color: var(--text-muted);\n}\n.form-group input, .form-group select {\n  padding: 10px 14px;\n  border: 1px solid var(--border);\n  border-radius: var(--radius-sm);\n  font-size: 15px;\n  font-family: 'JetBrains Mono', monospace;\n  background: var(--white);\n  color: var(--text);\n  transition: border-color 0.2s, box-shadow 0.2s;\n}\n.form-group input:focus, .form-group select:focus {\n  outline: none;\n  border-color: var(--blue);\n  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);\n}\n.calc-btn {\n  grid-column: 1 \/ -1;\n  padding: 13px;\n  background: var(--blue);\n  color: var(--white);\n  border: none;\n  border-radius: var(--radius-sm);\n  font-size: 15px;\n  font-weight: 600;\n  font-family: 'Source Sans 3', sans-serif;\n  cursor: pointer;\n  transition: all 0.2s;\n  margin-top: 4px;\n}\n.calc-btn:hover {\n  background: var(--navy);\n  transform: translateY(-1px);\n  box-shadow: var(--shadow-md);\n}<\/p>\n<p>\/* Results *\/\n.results-panel {\n  background: var(--navy);\n  border-radius: var(--radius-lg);\n  padding: 32px;\n  color: var(--white);\n  position: relative;\n  overflow: hidden;\n}\n.results-panel::before {\n  content: '';\n  position: absolute; inset: 0;\n  background: radial-gradient(circle at 100% 0%, rgba(37,99,235,0.2) 0%, transparent 60%);\n  pointer-events: none;\n}\n.results-panel .panel-title { color: var(--white); }\n.results-panel .panel-subtitle { color: rgba(255,255,255,0.5); }<\/p>\n<p>.result-primary {\n  background: rgba(255,255,255,0.07);\n  border: 1px solid rgba(255,255,255,0.1);\n  border-radius: var(--radius);\n  padding: 24px;\n  text-align: center;\n  margin-bottom: 16px;\n  position: relative;\n  z-index: 1;\n}\n.result-primary .res-label {\n  font-size: 12px;\n  font-weight: 700;\n  text-transform: uppercase;\n  letter-spacing: 1px;\n  color: var(--blue-light);\n  margin-bottom: 8px;\n}\n.result-primary .res-value {\n  font-family: 'JetBrains Mono', monospace;\n  font-size: 42px;\n  font-weight: 700;\n  line-height: 1;\n  margin-bottom: 4px;\n}\n.result-primary .res-unit {\n  font-size: 16px;\n  color: rgba(255,255,255,0.5);\n}<\/p>\n<p>.results-secondary {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 12px;\n  position: relative;\n  z-index: 1;\n}\n.res-card {\n  background: rgba(255,255,255,0.06);\n  border: 1px solid rgba(255,255,255,0.08);\n  border-radius: var(--radius-sm);\n  padding: 16px;\n}\n.res-card .rc-label {\n  font-size: 11px;\n  font-weight: 600;\n  text-transform: uppercase;\n  letter-spacing: 0.5px;\n  color: rgba(255,255,255,0.45);\n  margin-bottom: 4px;\n}\n.res-card .rc-value {\n  font-family: 'JetBrains Mono', monospace;\n  font-size: 20px;\n  font-weight: 600;\n}\n.res-card .rc-unit {\n  font-size: 12px;\n  color: rgba(255,255,255,0.4);\n}\n.results-empty {\n  text-align: center;\n  padding: 60px 20px;\n  color: rgba(255,255,255,0.35);\n  font-size: 15px;\n  position: relative;\n  z-index: 1;\n}\n.results-empty .icon { font-size: 36px; margin-bottom: 12px; display: block; }<\/p>\n<p>\/* ===== G-GRADE CARDS ===== *\/\n.grades-section {\n  padding: 40px 0 48px;\n  background: var(--beige-light);\n}\n.section-header {\n  margin-bottom: 28px;\n}\n.section-header h2 {\n  font-family: 'DM Serif Display', serif;\n  font-size: 30px;\n  color: var(--navy);\n  margin-bottom: 6px;\n}\n.section-header p {\n  font-size: 16px;\n  color: var(--text-secondary);\n}<\/p>\n<p>.grade-cards {\n  display: grid;\n  grid-template-columns: repeat(4, 1fr);\n  gap: 16px;\n  margin-bottom: 36px;\n}\n.grade-card {\n  background: var(--white);\n  border: 1px solid var(--border-light);\n  border-radius: var(--radius);\n  padding: 20px;\n  box-shadow: var(--shadow-sm);\n  transition: all 0.3s;\n  position: relative;\n  overflow: hidden;\n}\n.grade-card:hover {\n  box-shadow: var(--shadow-lg);\n  transform: translateY(-3px);\n}\n.grade-card::before {\n  content: '';\n  position: absolute;\n  top: 0; left: 0; right: 0;\n  height: 3px;\n}\n.grade-card.precision::before { background: var(--blue); }\n.grade-card.standard::before { background: var(--success); }\n.grade-card.general::before { background: var(--warning); }\n.grade-card.coarse::before { background: var(--danger); }<\/p>\n<p>.gc-grade {\n  font-family: 'JetBrains Mono', monospace;\n  font-size: 24px;\n  font-weight: 700;\n  margin-bottom: 2px;\n}\n.grade-card.precision .gc-grade { color: var(--blue); }\n.grade-card.standard .gc-grade { color: var(--success); }\n.grade-card.general .gc-grade { color: var(--warning); }\n.grade-card.coarse .gc-grade { color: var(--danger); }<\/p>\n<p>.gc-velocity {\n  font-size: 12px;\n  font-family: 'JetBrains Mono', monospace;\n  color: var(--text-muted);\n  margin-bottom: 10px;\n}\n.gc-apps {\n  font-size: 13px;\n  color: var(--text-secondary);\n  line-height: 1.5;\n}\n.gc-apps strong {\n  display: block;\n  font-size: 14px;\n  color: var(--text);\n  margin-bottom: 4px;\n}<\/p>\n<p>\/* ===== TABLES ===== *\/\n.table-wrap {\n  background: var(--white);\n  border-radius: var(--radius);\n  border: 1px solid var(--border-light);\n  overflow: hidden;\n  box-shadow: var(--shadow-sm);\n  margin-bottom: 32px;\n}\n.table-wrap .table-title {\n  padding: 16px 24px;\n  font-weight: 600;\n  font-size: 15px;\n  background: var(--beige);\n  border-bottom: 1px solid var(--border-light);\n  color: var(--navy);\n}\ntable {\n  width: 100%;\n  border-collapse: collapse;\n}\ntable th {\n  background: var(--navy);\n  color: var(--white);\n  padding: 12px 16px;\n  font-size: 13px;\n  font-weight: 600;\n  text-transform: uppercase;\n  letter-spacing: 0.5px;\n  text-align: left;\n}\ntable td {\n  padding: 11px 16px;\n  font-size: 14px;\n  border-bottom: 1px solid var(--border-light);\n  color: var(--text);\n}\ntable tr:last-child td { border-bottom: none; }\ntable tr:hover td { background: var(--blue-ghost); }\ntable td:first-child { font-weight: 600; }\n.mono {\n  font-family: 'JetBrains Mono', monospace;\n  font-size: 13px;\n}\n.tag {\n  display: inline-block;\n  padding: 2px 8px;\n  border-radius: 4px;\n  font-size: 11px;\n  font-weight: 600;\n  text-transform: uppercase;\n  letter-spacing: 0.3px;\n}\n.tag.precision { background: var(--blue-pale); color: var(--navy); }\n.tag.standard { background: var(--success-light); color: #065f46; }\n.tag.general { background: var(--warning-light); color: #92400e; }\n.tag.coarse { background: var(--danger-light); color: #991b1b; }<\/p>\n<p>\/* Comparison mini-table *\/\n.compare-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 24px;\n  margin-bottom: 36px;\n}<\/p>\n<p>\/* ===== MAIN CONTENT ===== *\/\n.main-content {\n  padding: 48px 0 64px;\n  background: var(--white);\n}\n.content-layout {\n  display: grid;\n  grid-template-columns: 1fr 300px;\n  gap: 48px;\n}<\/p>\n<p>\/* TOC sidebar *\/\n.toc-sidebar {\n  position: sticky;\n  top: 80px;\n  align-self: start;\n}\n.toc-box {\n  background: var(--beige-light);\n  border: 1px solid var(--beige-dark);\n  border-radius: var(--radius);\n  padding: 24px;\n}\n.toc-box h3 {\n  font-size: 14px;\n  font-weight: 700;\n  text-transform: uppercase;\n  letter-spacing: 0.5px;\n  color: var(--navy);\n  margin-bottom: 16px;\n}\n.toc-box a {\n  display: block;\n  padding: 6px 0;\n  font-size: 14px;\n  color: var(--text-secondary);\n  text-decoration: none;\n  border-left: 2px solid transparent;\n  padding-left: 12px;\n  transition: all 0.2s;\n}\n.toc-box a:hover {\n  color: var(--blue);\n  border-left-color: var(--blue);\n}\n.toc-box a.sub {\n  padding-left: 28px;\n  font-size: 13px;\n  color: var(--text-muted);\n}<\/p>\n<p>\/* Article *\/\n.article-content h2 {\n  font-family: 'DM Serif Display', serif;\n  font-size: 28px;\n  color: var(--navy);\n  margin: 48px 0 16px;\n  padding-top: 20px;\n}\n.article-content h2:first-child { margin-top: 0; }\n.article-content h3 {\n  font-size: 20px;\n  font-weight: 700;\n  color: var(--navy-light);\n  margin: 32px 0 12px;\n}\n.article-content h4 {\n  font-size: 16px;\n  font-weight: 700;\n  color: var(--text);\n  margin: 24px 0 8px;\n}\n.article-content p {\n  margin-bottom: 16px;\n  color: var(--text);\n  line-height: 1.8;\n}\n.article-content ul, .article-content ol {\n  margin: 0 0 16px 24px;\n  line-height: 1.8;\n}\n.article-content li { margin-bottom: 6px; }\n.article-content li strong { color: var(--navy); }\n.article-content a {\n  color: var(--blue);\n  text-decoration: none;\n  border-bottom: 1px solid transparent;\n  transition: border-color 0.2s;\n}\n.article-content a:hover { border-bottom-color: var(--blue); }<\/p>\n<p>\/* Info boxes *\/\n.info-box {\n  background: var(--blue-ghost);\n  border-left: 4px solid var(--blue);\n  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;\n  padding: 20px 24px;\n  margin: 24px 0;\n}\n.info-box.warning {\n  background: #fffbeb;\n  border-left-color: var(--warning);\n}\n.info-box.success {\n  background: #ecfdf5;\n  border-left-color: var(--success);\n}\n.info-box .box-title {\n  font-weight: 700;\n  font-size: 15px;\n  margin-bottom: 6px;\n  color: var(--navy);\n}\n.info-box p { margin-bottom: 8px; font-size: 14px; }\n.info-box p:last-child { margin-bottom: 0; }<\/p>\n<p>\/* Example block *\/\n.example-block {\n  background: var(--beige-light);\n  border: 1px solid var(--beige-dark);\n  border-radius: var(--radius);\n  padding: 28px;\n  margin: 24px 0;\n}\n.example-block .example-title {\n  font-family: 'DM Serif Display', serif;\n  font-size: 18px;\n  color: var(--navy);\n  margin-bottom: 16px;\n}<\/p>\n<p>\/* Formula highlight *\/\n.formula-box {\n  background: var(--navy);\n  color: var(--white);\n  border-radius: var(--radius);\n  padding: 28px 32px;\n  margin: 24px 0;\n  text-align: center;\n  position: relative;\n  overflow: hidden;\n}\n.formula-box::before {\n  content: '';\n  position: absolute; inset: 0;\n  background: radial-gradient(circle at 80% 50%, rgba(37,99,235,0.15) 0%, transparent 60%);\n  pointer-events: none;\n}\n.formula-box .formula-label {\n  font-size: 12px;\n  font-weight: 700;\n  text-transform: uppercase;\n  letter-spacing: 1px;\n  color: var(--blue-light);\n  margin-bottom: 12px;\n  position: relative;\n}\n.formula-box .formula-main {\n  font-family: 'JetBrains Mono', monospace;\n  font-size: 26px;\n  font-weight: 600;\n  position: relative;\n  line-height: 1.4;\n}\n.formula-box .formula-note {\n  font-size: 13px;\n  color: rgba(255,255,255,0.5);\n  margin-top: 12px;\n  position: relative;\n}<\/p>\n<p>\/* Article table *\/\n.article-table {\n  width: 100%;\n  margin: 20px 0;\n  border: 1px solid var(--border-light);\n  border-radius: var(--radius-sm);\n  overflow: hidden;\n}\n.article-table th { padding: 10px 14px; font-size: 12px; }\n.article-table td { padding: 10px 14px; font-size: 14px; }<\/p>\n<p>\/* Visual scale bar *\/\n.scale-bar-wrap {\n  margin: 24px 0;\n}\n.scale-bar-label {\n  display: flex;\n  justify-content: space-between;\n  font-size: 12px;\n  font-weight: 600;\n  text-transform: uppercase;\n  letter-spacing: 0.5px;\n  color: var(--text-muted);\n  margin-bottom: 8px;\n}\n.scale-bar {\n  height: 40px;\n  border-radius: var(--radius-sm);\n  overflow: hidden;\n  display: flex;\n  position: relative;\n}\n.scale-seg {\n  display: flex;\n  align-items: center;\n  justify-content: center;\n  font-size: 12px;\n  font-weight: 700;\n  color: var(--white);\n  transition: flex 0.3s;\n}<\/p>\n<p>\/* ===== SHOP CTA ===== *\/\n.shop-cta {\n  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);\n  padding: 48px 0;\n  color: var(--white);\n  text-align: center;\n  position: relative;\n  overflow: hidden;\n}\n.shop-cta::before {\n  content: '';\n  position: absolute; inset: 0;\n  background: radial-gradient(circle at 50% 50%, rgba(37,99,235,0.15) 0%, transparent 60%);\n  pointer-events: none;\n}\n.shop-cta h2 {\n  font-family: 'DM Serif Display', serif;\n  font-size: 32px;\n  margin-bottom: 12px;\n  position: relative;\n}\n.shop-cta p {\n  font-size: 17px;\n  color: rgba(255,255,255,0.7);\n  margin-bottom: 28px;\n  max-width: 640px;\n  margin-left: auto;\n  margin-right: auto;\n  position: relative;\n}\n.shop-cta .cta-btn {\n  display: inline-flex;\n  align-items: center;\n  gap: 8px;\n  padding: 14px 36px;\n  background: var(--blue);\n  color: var(--white);\n  text-decoration: none;\n  border-radius: var(--radius-sm);\n  font-weight: 600;\n  font-size: 16px;\n  transition: all 0.2s;\n  position: relative;\n}\n.shop-cta .cta-btn:hover {\n  background: var(--blue-light);\n  transform: translateY(-2px);\n  box-shadow: 0 8px 24px rgba(37,99,235,0.3);\n}<\/p>\n<p>\/* Footer *\/\n.page-footer {\n  background: var(--beige);\n  border-top: 1px solid var(--beige-dark);\n  padding: 32px 0;\n  text-align: center;\n}\n.page-footer a { color: var(--blue); text-decoration: none; font-weight: 500; }\n.page-footer p { font-size: 14px; color: var(--text-muted); }<\/p>\n<p>\/* Animations *\/\n@keyframes fadeInUp {\n  from { opacity: 0; transform: translateY(16px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.animate-in { animation: fadeInUp 0.5s ease-out forwards; }\n.delay-1 { animation-delay: 0.1s; opacity: 0; }\n.delay-2 { animation-delay: 0.2s; opacity: 0; }<\/p>\n<p>@media print {\n  .quick-nav, .shop-cta { display: none; }\n  body { min-width: auto; }\n}\n<\/style>\n<p><!-- HERO --><\/p>\n<header class=\"hero\">\n<div class=\"hero-inner\">\n<div class=\"breadcrumb\">\n      <a href=\"https:\/\/vibromera.eu\/mn\/\">Home<\/a> \u2192 <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/\">Glossary<\/a> \u2192 Balance Quality Grades\n    <\/div>\n<h1>Understanding <span>Balance Quality Grades<\/span> (G-Grades)<\/h1>\n<p class=\"subtitle\">The ISO-standardized classification system for specifying acceptable residual unbalance \u2014 from precision gyroscopes at G0.4 to heavy marine diesels at G4000. Complete with calculator, reference tables, and practical examples.<\/p>\n<\/p><\/div>\n<\/header>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A full kit portable balancer and vibration analyzer\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">Portable balancer &#038; Vibration analyzer Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/vibration-sensor\/\" title=\"Vibration sensor\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A vibration sensor close-up\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/vibration-sensor\/\" title=\"Vibration sensor\">Vibration sensor<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Optical Sensor (Laser Tachometer)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">Optical Sensor (Laser Tachometer)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">Magnetic Stand Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>46.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"Add to cart: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/reflective-tape\/\" title=\"Reflective tape\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Reflective tape\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/reflective-tape\/\" title=\"Reflective tape\">Reflective tape<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>10.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"Add to cart: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/dynamic-balancer-balanset-1a\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mn\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamic balancer \u201cBalanset-1A\u201d OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A kit contents with interface unit, sensors, tachometer and accessories\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mn\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mn\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamic balancer \u201cBalanset-1A\u201d OEM\">Dynamic balancer \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,735.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mn\/wp-json\/wp\/v2\/glossary\/130?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><!-- QUICK NAV --><\/p>\n<nav class=\"quick-nav\">\n<div class=\"quick-nav-inner\">\n    <a href=\"#calculator\">\u2699 Calculator<\/a><br \/>\n    <a href=\"#grade-overview\">\ud83d\udcca Grade Overview<\/a><br \/>\n    <a href=\"#full-table\">\ud83d\udccb ISO Table<\/a><br \/>\n    <a href=\"#definition\">\ud83d\udcd0 Definition<\/a><br \/>\n    <a href=\"#how-it-works\">\ud83d\udd22 How It Works<\/a><br \/>\n    <a href=\"#selecting\">\ud83c\udfaf Selecting a Grade<\/a><br \/>\n    <a href=\"#practical\">\ud83d\udee0 Practical Examples<\/a><br \/>\n    <a href=\"#two-plane\">\u2696 Two-Plane Balancing<\/a><br \/>\n    <a href=\"#common-mistakes\">\u26a0 Common Mistakes<\/a><br \/>\n    <a href=\"#importance\">\ud83d\udca1 Why It Matters<\/a>\n  <\/div>\n<\/nav>\n<p><!-- SUMMARY DASHBOARD --><\/p>\n<section class=\"summary-dashboard\" id=\"calculator\">\n<div class=\"container\">\n<div class=\"dashboard-grid\">\n<p>      <!-- Calculator --><\/p>\n<div class=\"calc-panel animate-in\">\n<h2 class=\"panel-title\">Permissible Unbalance Calculator<\/h2>\n<p class=\"panel-subtitle\">Calculate U<sub>per<\/sub> based on ISO 21940-11 (formerly ISO 1940-1)<\/p>\n<div class=\"calc-form\">\n<div class=\"form-group\">\n            <label>G-Grade<\/label><br \/>\n            <select id=\"gGrade\"><option value=\"0.4\">G 0.4 \u2014 Gyroscopes, precision spindles<\/option><option value=\"0.7\">G 0.7 \u2014 Precision grinders<\/option><option value=\"1\">G 1.0 \u2014 Grinding machines, small motors<\/option><option value=\"1.5\">G 1.5 \u2014 Audio\/video drives<\/option><option value=\"2.5\" selected>G 2.5 \u2014 Turbines, large motors, pumps<\/option><option value=\"4\">G 4.0 \u2014 Compressors, general machinery<\/option><option value=\"6.3\">G 6.3 \u2014 Fans, flywheels, process equipment<\/option><option value=\"10\">G 10 \u2014 General marine, diesel assemblies<\/option><option value=\"16\">G 16 \u2014 Crankshafts (trucks, locomotives)<\/option><option value=\"25\">G 25 \u2014 Agricultural machinery<\/option><option value=\"40\">G 40 \u2014 Automobile wheels, drive shafts<\/option><option value=\"100\">G 100 \u2014 Slow marine diesel assemblies<\/option><option value=\"250\">G 250 \u2014 Slow large diesels (on springs)<\/option><option value=\"630\">G 630 \u2014 Coarse reciprocating engines<\/option><option value=\"4000\">G 4000 \u2014 Very coarse (crankshaft on springs)<\/option><\/select>\n          <\/div>\n<div class=\"form-group\">\n            <label>Rotor Mass <span class=\"unit\">(kg)<\/span><\/label><br \/>\n            <input type=\"number\" id=\"rotorMass\" value=\"25\" min=\"0.001\" step=\"0.1\">\n          <\/div>\n<div class=\"form-group\">\n            <label>Service Speed <span class=\"unit\">(RPM)<\/span><\/label><br \/>\n            <input type=\"number\" id=\"serviceRPM\" value=\"3000\" min=\"1\" step=\"1\">\n          <\/div>\n<div class=\"form-group\">\n            <label>Number of Planes <span class=\"unit\">(correction)<\/span><\/label><br \/>\n            <select id=\"numPlanes\"><option value=\"1\">Single-plane<\/option><option value=\"2\" selected>Two-plane<\/option><\/select>\n          <\/div>\n<p>          <button class=\"calc-btn\" onclick=\"calculate()\">Calculate Permissible Unbalance \u2192<\/button>\n        <\/div>\n<\/p><\/div>\n<p>      <!-- Results --><\/p>\n<div class=\"results-panel animate-in delay-1\">\n<h2 class=\"panel-title\">Calculated Tolerance<\/h2>\n<p class=\"panel-subtitle\">Results based on ISO 21940-11<\/p>\n<div id=\"resultsArea\">\n<div class=\"results-empty\">\n            <span class=\"icon\">\u2696<\/span><br \/>\n            Enter rotor parameters and click Calculate<br \/>to see permissible unbalance\n          <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- G-GRADE OVERVIEW CARDS + TABLES --><\/p>\n<section class=\"grades-section\" id=\"grade-overview\">\n<div class=\"container\">\n<div class=\"section-header\">\n<h2>G-Grade Overview \u2014 At a Glance<\/h2>\n<p>Quick reference cards for the most commonly used balance quality grades in industrial practice<\/p>\n<\/p><\/div>\n<div class=\"grade-cards\">\n<div class=\"grade-card precision\">\n<div class=\"gc-grade\">G 0.4<\/div>\n<div class=\"gc-velocity\">0.4 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Ultra-Precision<\/strong><br \/>\n          Gyroscopes, precision spindles, high-speed dental\/surgical tools, satellite reaction wheels\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card precision\">\n<div class=\"gc-grade\">G 1.0<\/div>\n<div class=\"gc-velocity\">1.0 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>High Precision<\/strong><br \/>\n          Grinding machine drives, small electric motors, high-speed machining spindles, computer HDDs\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card standard\">\n<div class=\"gc-grade\">G 2.5<\/div>\n<div class=\"gc-velocity\">2.5 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Standard Precision<\/strong><br \/>\n          Gas\/steam turbines, generators, medium\/large electric motors, turbochargers, machine tool drives\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card standard\">\n<div class=\"gc-grade\">G 6.3<\/div>\n<div class=\"gc-velocity\">6.3 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>General Industrial<\/strong><br \/>\n          Fans, pump impellers, flywheels, centrifuges, process plant machinery, HVAC equipment\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card general\">\n<div class=\"gc-grade\">G 16<\/div>\n<div class=\"gc-velocity\">16 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Coarse Industrial<\/strong><br \/>\n          Crankshaft drives (trucks, locomotives), parts of agricultural machinery, car wheel assemblies\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card general\">\n<div class=\"gc-grade\">G 40<\/div>\n<div class=\"gc-velocity\">40 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Heavy \/ Automotive<\/strong><br \/>\n          Automobile wheels, drive shafts, crankshaft drives for large slow marine diesel engines\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card coarse\">\n<div class=\"gc-grade\">G 100<\/div>\n<div class=\"gc-velocity\">100 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Very Coarse<\/strong><br \/>\n          Complete slow diesel engine assemblies, slow marine diesel crankshaft drives (rigidly mounted)\n        <\/div>\n<\/p><\/div>\n<div class=\"grade-card coarse\">\n<div class=\"gc-grade\">G 630+<\/div>\n<div class=\"gc-velocity\">630\u20134000 mm\/s<\/div>\n<div class=\"gc-apps\">\n          <strong>Reciprocating Engines<\/strong><br \/>\n          Large reciprocating engines on elastic mounts, crankshaft drives on flexible supports\n        <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<p>    <!-- FULL ISO TABLE --><\/p>\n<div class=\"table-wrap\" id=\"full-table\">\n<div class=\"table-title\">\ud83d\udccb Complete ISO 21940-11 Balance Quality Grades \u2014 Rotor Application Table<\/div>\n<table>\n<thead>\n<tr>\n<th>G-Grade<\/th>\n<th>e<sub>per<\/sub> \u00d7 \u03c9 (mm\/s)<\/th>\n<th>Precision Class<\/th>\n<th>Rotor Types \/ Applications<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"mono\">G 4000<\/td>\n<td class=\"mono\">4000<\/td>\n<td><span class=\"tag coarse\">Very Coarse<\/span><\/td>\n<td>Crankshaft drives of large slow marine diesel engines (on elastic mounts), inherently unbalanced<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 1600<\/td>\n<td class=\"mono\">1600<\/td>\n<td><span class=\"tag coarse\">Very Coarse<\/span><\/td>\n<td>Crankshaft drives of large slow marine diesel engines (rigidly mounted)<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 630<\/td>\n<td class=\"mono\">630<\/td>\n<td><span class=\"tag coarse\">Coarse<\/span><\/td>\n<td>Crankshaft drives of fast-running, large reciprocating engines with odd number of cylinders<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 250<\/td>\n<td class=\"mono\">250<\/td>\n<td><span class=\"tag coarse\">Coarse<\/span><\/td>\n<td>Crankshaft drives of fast-running, large reciprocating engines with even number of cylinders<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 100<\/td>\n<td class=\"mono\">100<\/td>\n<td><span class=\"tag general\">General<\/span><\/td>\n<td>Complete reciprocating engine assemblies; crankshaft drives of slow marine diesel (rigidly mounted)<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 40<\/td>\n<td class=\"mono\">40<\/td>\n<td><span class=\"tag general\">General<\/span><\/td>\n<td>Automobile wheels, rims, wheel sets; drive shafts; crankshaft drives for large, slow marine diesel engines<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 25<\/td>\n<td class=\"mono\">25<\/td>\n<td><span class=\"tag general\">General<\/span><\/td>\n<td>Parts of agricultural machinery; crankshaft drives for engines of trucks and locomotives<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 16<\/td>\n<td class=\"mono\">16<\/td>\n<td><span class=\"tag general\">General<\/span><\/td>\n<td>Parts of crushing\/agricultural machinery; crankshaft drives for trucks\/locomotives; car engines (special requirements)<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 10<\/td>\n<td class=\"mono\">10<\/td>\n<td><span class=\"tag standard\">Standard<\/span><\/td>\n<td>General marine diesel engine assemblies; crankshaft drives for engines with special requirements<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 6.3<\/td>\n<td class=\"mono\">6.3<\/td>\n<td><span class=\"tag standard\">Standard<\/span><\/td>\n<td>Fans; flywheels; pump impellers; centrifuge drums; process plant machinery; general industrial<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 4<\/td>\n<td class=\"mono\">4<\/td>\n<td><span class=\"tag standard\">Standard<\/span><\/td>\n<td>Compressor rotors (rigid); electric motor armatures; general machinery with special requirements<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 2.5<\/td>\n<td class=\"mono\">2.5<\/td>\n<td><span class=\"tag standard\">Standard<\/span><\/td>\n<td>Gas\/steam turbines; turbo-generator rotors; turbochargers; machine tool drives; medium\/large electric motors; pumps with turbine drive<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 1.5<\/td>\n<td class=\"mono\">1.5<\/td>\n<td><span class=\"tag precision\">Precision<\/span><\/td>\n<td>Audio\/video tape recorder drives; textile machine drives<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 1.0<\/td>\n<td class=\"mono\">1.0<\/td>\n<td><span class=\"tag precision\">Precision<\/span><\/td>\n<td>Grinding machine drives; small electric armatures (special requirements); computer memory drums\/discs<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 0.7<\/td>\n<td class=\"mono\">0.7<\/td>\n<td><span class=\"tag precision\">Precision<\/span><\/td>\n<td>Precision grinding machine spindles; high-precision motor armatures<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">G 0.4<\/td>\n<td class=\"mono\">0.4<\/td>\n<td><span class=\"tag precision\">Ultra-Precision<\/span><\/td>\n<td>Spindles of precision grinders; gyroscopes; satellite reaction wheels<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>    <!-- Quick-calc table for common scenarios --><\/p>\n<div class=\"table-wrap\">\n<div class=\"table-title\">\ud83d\udd22 Pre-Calculated Tolerances \u2014 Common Rotor Scenarios at G 2.5 and G 6.3<\/div>\n<table>\n<thead>\n<tr>\n<th>Rotor Mass (kg)<\/th>\n<th>RPM<\/th>\n<th>U<sub>per<\/sub> at G 2.5 (g\u00b7mm)<\/th>\n<th>U<sub>per<\/sub> at G 6.3 (g\u00b7mm)<\/th>\n<th>e<sub>per<\/sub> at G 2.5 (\u00b5m)<\/th>\n<th>e<sub>per<\/sub> at G 6.3 (\u00b5m)<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"preCalcBody\">\n        <\/tbody>\n<\/table><\/div>\n<p>    <!-- ISO vs other standards --><\/p>\n<div class=\"table-wrap\">\n<div class=\"table-title\">\ud83c\udf0d ISO 21940-11 vs. Related Standards Comparison<\/div>\n<table>\n<thead>\n<tr>\n<th>Standard<\/th>\n<th>Status<\/th>\n<th>Scope<\/th>\n<th>Key Difference<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ISO 21940-11:2016<\/td>\n<td><span class=\"tag standard\">Current<\/span><\/td>\n<td>Balance quality requirements for rigid rotors<\/td>\n<td>Current international standard; replaces ISO 1940-1<\/td>\n<\/tr>\n<tr>\n<td>ISO 1940-1:2003<\/td>\n<td><span class=\"tag general\">Superseded<\/span><\/td>\n<td>Balance quality requirements (legacy)<\/td>\n<td>Same G-grade system; still widely referenced in industry<\/td>\n<\/tr>\n<tr>\n<td>ISO 21940-12<\/td>\n<td><span class=\"tag standard\">Current<\/span><\/td>\n<td>Procedures for flexible rotors<\/td>\n<td>Flexible rotors operating near\/above critical speeds<\/td>\n<\/tr>\n<tr>\n<td>API 610 \/ 611 \/ 612 \/ 617<\/td>\n<td><span class=\"tag precision\">Industry<\/span><\/td>\n<td>Petroleum\/gas industry rotating equipment<\/td>\n<td>Often specifies 4W\/N (\u2248 G 1.0) \u2014 tighter than ISO G 2.5<\/td>\n<\/tr>\n<tr>\n<td>ANSI S2.19<\/td>\n<td><span class=\"tag standard\">National<\/span><\/td>\n<td>US national balance quality standard<\/td>\n<td>Technically identical to ISO 1940-1 (adopted)<\/td>\n<\/tr>\n<tr>\n<td>VDI 2060<\/td>\n<td><span class=\"tag general\">Superseded<\/span><\/td>\n<td>German balance quality standard (historical)<\/td>\n<td>Predecessor to ISO 1940; established the G-grade concept<\/td>\n<\/tr>\n<tr>\n<td>DIN ISO 21940-11<\/td>\n<td><span class=\"tag standard\">Current<\/span><\/td>\n<td>German adoption of ISO 21940-11<\/td>\n<td>Identical to ISO 21940-11 with German translation<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- MAIN ARTICLE CONTENT --><br \/>\n<main class=\"main-content\" id=\"definition\"><\/p>\n<div class=\"container\">\n<div class=\"content-layout\">\n<article class=\"article-content\">\n<h2>Definition: What is a Balance Quality Grade?<\/h2>\n<p>A <strong>Balance Quality Grade<\/strong>, commonly referred to as a <strong>G-Grade<\/strong>, is a classification system defined by ISO standards\u2014specifically <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/iso-21940-11\/\">ISO 21940-11:2016<\/a>, which superseded the older ISO 1940-1:2003\u2014to specify the acceptable limit of <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/residual-unbalance\/\">residual<\/a> <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/unbalance\/\">unbalance<\/a> for a <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/rigid-rotor\/\">rigid rotor<\/a>. It provides a standardized, internationally recognized method for engineers, manufacturers, and maintenance personnel to define how precisely a rotor needs to be balanced for its specific application.<\/p>\n<p>The G-Grade number\u2014such as G6.3 or G2.5\u2014represents a constant peripheral velocity of the rotor&#8217;s center of mass, measured in millimeters per second (mm\/s). This velocity is the product of the specific unbalance (eccentricity) and the angular velocity of the rotor at its maximum service speed. A lower G-number always signifies a higher level of precision and a tighter balance tolerance.<\/p>\n<div class=\"info-box\">\n<div class=\"box-title\">The Key Insight Behind G-Grades<\/div>\n<p>The genius of the G-grade system lies in its recognition that <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/vibration-severity\/\">vibration severity<\/a> depends not just on how much unbalance exists, but on how fast the rotor spins. A rotor with 10 g\u00b7mm of unbalance at 30,000 RPM produces far more vibration force than the same 10 g\u00b7mm at 1,500 RPM. The G-grade captures this relationship in a single number that applies regardless of speed, making it universal.<\/p>\n<\/p><\/div>\n<h3>Historical Context<\/h3>\n<p>The G-grade concept originated in Germany with the VDI 2060 guideline in the 1960s. It was adopted internationally as ISO 1940 in 1973, revised significantly in 2003 (ISO 1940-1:2003), and most recently updated as part of the ISO 21940 series in 2016. Despite the standard number changes, the fundamental G-grade system and calculation method have remained consistent for over 50 years, making it one of the most stable and widely adopted technical standards in mechanical engineering.<\/p>\n<h2 id=\"how-it-works\">How Do G-Grades Work? The Mathematics<\/h2>\n<p>The G-Grade is not the final <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/balancing-tolerance\/\">balance tolerance<\/a> itself, but rather the key parameter used to calculate it. Understanding the mathematical relationship between the G-grade, rotor speed, rotor mass, and permissible unbalance is essential for practical application. You can skip the hand calculation with our <a href=\"https:\/\/vibromera.eu\/mn\/calculators\/residual-unbalance-iso1940\/\">Residual Unbalance Calculator (ISO 21940-11)<\/a>.<\/p>\n<h3>The Core Relationship<\/h3>\n<p>The G-grade represents the product of the permissible specific unbalance (eccentricity, e<sub>per<\/sub>) and the angular velocity (\u03c9) of the rotor:<\/p>\n<div class=\"formula-box\">\n<div class=\"formula-label\">Fundamental Definition<\/div>\n<div class=\"formula-main\">G = e<sub>per<\/sub> \u00d7 \u03c9<\/div>\n<div class=\"formula-note\">where e<sub>per<\/sub> is in mm (or \u00b5m \u00f7 1000) and \u03c9 is in rad\/s<\/div>\n<\/p><\/div>\n<p>Since \u03c9 = 2\u03c0 \u00d7 n \/ 60 (where n is RPM), and substituting, we can derive the practical formulas used daily in balancing work:<\/p>\n<div class=\"formula-box\">\n<div class=\"formula-label\">Permissible Specific Unbalance (eccentricity)<\/div>\n<div class=\"formula-main\">e<sub>per<\/sub> = (G \u00d7 1000 \u00d7 60) \/ (2\u03c0 \u00d7 n) = 9549 \u00d7 G \/ n<\/div>\n<div class=\"formula-note\">Result in \u00b5m (micrometers) \u2014 also equal to g\u00b7mm\/kg<\/div>\n<\/p><\/div>\n<div class=\"formula-box\">\n<div class=\"formula-label\">Permissible Residual Unbalance (the practical tolerance)<\/div>\n<div class=\"formula-main\">U<sub>per<\/sub> = e<sub>per<\/sub> \u00d7 M = (9549 \u00d7 G \u00d7 M) \/ n<\/div>\n<div class=\"formula-note\">U<sub>per<\/sub> in g\u00b7mm, M in kg, n in RPM. The constant 9549 \u2248 60000\/(2\u03c0).<\/div>\n<\/p><\/div>\n<h3>Understanding the Variables<\/h3>\n<table class=\"article-table\">\n<thead>\n<tr>\n<th>Variable<\/th>\n<th>Name<\/th>\n<th>Units<\/th>\n<th>Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"mono\">G<\/td>\n<td>Balance Quality Grade<\/td>\n<td>mm\/s<\/td>\n<td>The ISO-specified quality level for the application (e.g., 2.5, 6.3)<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">e<sub>per<\/sub><\/td>\n<td>Permissible specific unbalance<\/td>\n<td>\u00b5m or g\u00b7mm\/kg<\/td>\n<td>Maximum allowable displacement of center of mass from geometric center, per unit mass<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">U<sub>per<\/sub><\/td>\n<td>Permissible residual unbalance<\/td>\n<td>g\u00b7mm<\/td>\n<td>The final tolerance value \u2014 maximum unbalance remaining after balancing<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">M<\/td>\n<td>Rotor mass<\/td>\n<td>kg<\/td>\n<td>Total mass of the rotor being balanced<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">n<\/td>\n<td>Maximum service speed<\/td>\n<td>RPM<\/td>\n<td>The highest operational speed the rotor will achieve in service<\/td>\n<\/tr>\n<tr>\n<td class=\"mono\">\u03c9<\/td>\n<td>Angular velocity<\/td>\n<td>rad\/s<\/td>\n<td>\u03c9 = 2\u03c0 \u00d7 n \/ 60; used in the fundamental definition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"info-box warning\">\n<div class=\"box-title\">Important: Use Maximum Service Speed<\/div>\n<p>The RPM in the formula must be the maximum speed the rotor will reach in actual operation \u2014 not the balancing machine speed. A rotor balanced on a slow-speed balancing machine at 300 RPM but operating at 12,000 RPM must have its tolerance calculated at 12,000 RPM. The balancing machine corrects to the tolerance, but the tolerance is defined by the service speed.<\/p>\n<\/p><\/div>\n<h3>The Geometric Interpretation<\/h3>\n<p>The ISO standard uses a logarithmic chart with rotor speed (RPM) on the horizontal axis and permissible specific unbalance (e<sub>per<\/sub> in g\u00b7mm\/kg) on the vertical axis. Each G-grade appears as a straight diagonal line on this log-log chart. This elegant visualization shows that:<\/p>\n<ul>\n<li>For any given G-grade, doubling the speed halves the permissible specific unbalance<\/li>\n<li>Adjacent G-grade lines are separated by a factor of 2.5 (the progression is: 0.4, 1.0, 2.5, 6.3, 16, 40, 100, 250, 630, 1600, 4000)<\/li>\n<li>The logarithmic spacing means each grade represents approximately the same perceptual change in vibration severity<\/li>\n<\/ul>\n<h2 id=\"selecting\">Selecting the Right G-Grade for Your Application<\/h2>\n<p>Choosing the correct G-grade requires balancing (no pun intended) several factors: the rotor&#8217;s intended application, operating speed, support structure stiffness, bearing type, and acceptable vibration levels. The ISO standard provides guidance through its application table, but several practical considerations apply:<\/p>\n<h3>Decision Factors<\/h3>\n<ul>\n<li><strong>Operating speed:<\/strong> Higher-speed rotors generally need tighter grades because <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/centrifugal-force\/\">centrifugal force<\/a> from unbalance increases with the square of speed (F = m \u00d7 e \u00d7 \u03c9\u00b2). A rotor at 30,000 RPM produces 100\u00d7 more force from the same unbalance than one at 3,000 RPM.<\/li>\n<li><strong>Bearing type:<\/strong> Rolling element bearings are less tolerant of unbalance than fluid film (<a href=\"https:\/\/vibromera.eu\/mn\/glossary\/journal-bearing\/\">journal<\/a>) bearings. Machines with rolling element bearings may need one grade tighter than the standard recommendation.<\/li>\n<li><strong>Support stiffness:<\/strong> Flexible supports (rubber mounts, spring isolators) amplify vibration transmission less than rigid supports but can have resonance issues. Rigidly mounted machines are more sensitive to unbalance.<\/li>\n<li><strong>Environmental requirements:<\/strong> Applications requiring low noise (HVAC in hospitals, recording studios) or low vibration (semiconductor manufacturing, optical laboratories) may require grades 1\u20132 levels tighter than standard.<\/li>\n<li><strong>Bearing life expectations:<\/strong> If extended bearing life is critical (offshore platforms, remote installations), specifying a tighter G-grade reduces dynamic loads on bearings, directly extending their <a href=\"https:\/\/vibromera.eu\/mn\/calculators\/bearing-load\/\">L10 life<\/a>.<\/li>\n<\/ul>\n<h3>Industry-Specific Recommendations<\/h3>\n<table class=\"article-table\">\n<thead>\n<tr>\n<th>Industry \/ Application<\/th>\n<th>Typical G-Grade<\/th>\n<th>Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Power generation (turbines)<\/td>\n<td class=\"mono\">G 2.5 or tighter<\/td>\n<td>API standards often require G 1.0 equivalent<\/td>\n<\/tr>\n<tr>\n<td>Oil &amp; gas (pumps, compressors)<\/td>\n<td class=\"mono\">G 2.5<\/td>\n<td>API 610\/617 specifies 4W\/N \u2248 G 1.0 for critical<\/td>\n<\/tr>\n<tr>\n<td>HVAC (fans, blowers)<\/td>\n<td class=\"mono\">G 6.3<\/td>\n<td>G 2.5 for noise-sensitive applications<\/td>\n<\/tr>\n<tr>\n<td>Machine tools<\/td>\n<td class=\"mono\">G 1.0 \u2013 G 2.5<\/td>\n<td>Grinding spindles may require G 0.4<\/td>\n<\/tr>\n<tr>\n<td>Paper\/printing machines<\/td>\n<td class=\"mono\">G 2.5 \u2013 G 6.3<\/td>\n<td>Depends on roller speed and print quality<\/td>\n<\/tr>\n<tr>\n<td>Mining\/cement (crushers, mills)<\/td>\n<td class=\"mono\">G 6.3 \u2013 G 16<\/td>\n<td>Harsh environment; tighter may not be achievable<\/td>\n<\/tr>\n<tr>\n<td>Automotive (crankshafts)<\/td>\n<td class=\"mono\">G 16 \u2013 G 40<\/td>\n<td>Passenger cars typically G 16; trucks G 25\u201340<\/td>\n<\/tr>\n<tr>\n<td>Food processing<\/td>\n<td class=\"mono\">G 6.3<\/td>\n<td>Hygiene design may limit correction methods<\/td>\n<\/tr>\n<tr>\n<td>Woodworking (saw blades, planers)<\/td>\n<td class=\"mono\">G 2.5 \u2013 G 6.3<\/td>\n<td>Higher grades for surface quality<\/td>\n<\/tr>\n<tr>\n<td>Electric motors (general)<\/td>\n<td class=\"mono\">G 2.5<\/td>\n<td>IEC 60034-14 references this for most motors<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"practical\">Practical Calculation Examples<\/h2>\n<div class=\"example-block\">\n<div class=\"example-title\">Example 1: Centrifugal Pump Impeller<\/div>\n<p><strong>Given:<\/strong> Pump impeller, mass = 12 kg, maximum service speed = 2950 RPM, application: process plant \u2192 ISO recommends G 6.3.<\/p>\n<p><strong>Step 1 \u2014 Calculate specific unbalance:<\/strong><\/p>\n<p>e<sub>per<\/sub> = 9549 \u00d7 G \/ n = 9549 \u00d7 6.3 \/ 2950 = <strong>20.4 \u00b5m<\/strong> (or 20.4 g\u00b7mm\/kg)<\/p>\n<p><strong>Step 2 \u2014 Calculate total permissible unbalance:<\/strong><\/p>\n<p>U<sub>per<\/sub> = e<sub>per<\/sub> \u00d7 M = 20.4 \u00d7 12 = <strong>244.8 g\u00b7mm<\/strong><\/p>\n<p><strong>Interpretation:<\/strong> The residual unbalance after balancing must not exceed 244.8 g\u00b7mm. If balancing on a single plane, this is the total tolerance. If balancing on two planes, this total must be apportioned between the two correction planes (typically 50\/50 for symmetric rotors).<\/p>\n<\/p><\/div>\n<div class=\"example-block\">\n<div class=\"example-title\">Example 2: Industrial Fan Rotor<\/div>\n<p><strong>Given:<\/strong> Fan rotor assembly, mass = 85 kg, maximum speed = 1480 RPM, application: ventilation \u2192 G 6.3.<\/p>\n<p><strong>Calculation:<\/strong><\/p>\n<p>U<sub>per<\/sub> = (9549 \u00d7 6.3 \u00d7 85) \/ 1480 = <strong>3454 g\u00b7mm<\/strong><\/p>\n<p>e<sub>per<\/sub> = 3454 \/ 85 = <strong>40.6 \u00b5m<\/strong><\/p>\n<p><strong>For two-plane balancing:<\/strong> U<sub>per<\/sub> per plane \u2248 3454 \/ 2 = <strong>1727 g\u00b7mm per plane<\/strong><\/p>\n<\/p><\/div>\n<div class=\"example-block\">\n<div class=\"example-title\">Example 3: Turbocharger Rotor (High Speed)<\/div>\n<p><strong>Given:<\/strong> Turbocharger rotor, mass = 0.8 kg, maximum speed = 90,000 RPM, application: automotive turbo \u2192 G 2.5.<\/p>\n<p><strong>Calculation:<\/strong><\/p>\n<p>U<sub>per<\/sub> = (9549 \u00d7 2.5 \u00d7 0.8) \/ 90000 = <strong>0.212 g\u00b7mm<\/strong><\/p>\n<p>e<sub>per<\/sub> = 0.212 \/ 0.8 = <strong>0.265 \u00b5m<\/strong><\/p>\n<p><strong>Note:<\/strong> At extremely high speeds, the tolerance becomes vanishingly small. This is why turbocharger balancing requires specialized high-precision equipment and why even minor contamination (fingerprints, dust) can push unbalance beyond tolerance.<\/p>\n<\/p><\/div>\n<p>For the more common cases above \u2014 pumps, fans, and general industrial rotors running at G 2.5 or G 6.3 \u2014 you can measure the residual unbalance, apply the correction weights, and verify the result against the chosen grade <em>in the field<\/em> with a portable instrument such as the <a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\">Balanset-1A<\/a>. Enter the rotor mass and service speed, balance the machine in place, and the software reports U<sub>per<\/sub> alongside a clear pass\/fail against the target G-grade \u2014 no need to dismount the rotor or send it to a balancing shop.<\/p>\n<div class=\"info-box success\">\n<div class=\"box-title\">Converting Between Units<\/div>\n<p>Common unit conversions in balancing work:<\/p>\n<p>1 g\u00b7mm = 1 mg\u00b7m = 0.001 kg\u00b7mm = 1000 \u00b5g\u00b7m<\/p>\n<p>1 oz\u00b7in = 720 g\u00b7mm (imperial systems, still used in some US industries)<\/p>\n<p>e<sub>per<\/sub> in \u00b5m = e<sub>per<\/sub> in g\u00b7mm\/kg (numerically identical \u2014 center of mass offset equals specific unbalance)<\/p>\n<\/p><\/div>\n<h2 id=\"two-plane\">Two-Plane Balancing \u2014 Apportioning the Tolerance<\/h2>\n<p>The G-grade formula calculates the <em>total<\/em> permissible residual unbalance for the entire rotor. For rotors that require <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/two-plane-balancing\/\">two-plane<\/a> (<a href=\"https:\/\/vibromera.eu\/mn\/glossary\/dynamic-balancing\/\">dynamic<\/a>) balancing \u2014 which is most industrial rotors where the length-to-diameter ratio exceeds approximately 0.5 \u2014 this total tolerance must be distributed between the two <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/correction-plane\/\">correction planes<\/a>.<\/p>\n<h3>ISO Guidelines for Tolerance Apportionment<\/h3>\n<p>ISO 21940-11 provides guidance on how to split the total tolerance between planes based on the rotor&#8217;s geometry:<\/p>\n<ul>\n<li><strong>Symmetric rotors<\/strong> (center of gravity midway between planes): Split 50\/50 between the two correction planes.<\/li>\n<li><strong>Asymmetric rotors<\/strong> (center of gravity closer to one plane): Apportion proportionally \u2014 the plane closer to the center of gravity receives a larger share of the tolerance. The standard provides formulae for this calculation.<\/li>\n<li><strong>General rule:<\/strong> U<sub>A<\/sub> \/ U<sub>B<\/sub> = L<sub>B<\/sub> \/ L<sub>A<\/sub>, where L<sub>A<\/sub> and L<sub>B<\/sub> are the distances from the center of gravity to planes A and B respectively.<\/li>\n<\/ul>\n<div class=\"info-box warning\">\n<div class=\"box-title\">Static vs. Couple Unbalance<\/div>\n<p>When the total residual unbalance is split between two planes, the <em>vector sum<\/em> of the two plane unbalances must not exceed U<sub>per<\/sub>. Simply checking each plane independently against half the total can miss a condition where both planes have acceptable individual unbalance but the combination (particularly <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/couple-unbalance\/\">couple unbalance<\/a>) exceeds the limit. Modern balancing machines typically check both the individual plane tolerances and the total residual.<\/p>\n<\/p><\/div>\n<h3>When is Single-Plane Balancing Sufficient?<\/h3>\n<p><a href=\"https:\/\/vibromera.eu\/mn\/glossary\/single-plane-balancing\/\">Single-plane<\/a> (<a href=\"https:\/\/vibromera.eu\/mn\/glossary\/static-balancing\/\">static<\/a>) balancing is adequate when:<\/p>\n<ul>\n<li>The rotor is a thin disc (L\/D ratio less than approximately 0.5)<\/li>\n<li>Operating speed is well below the first <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/critical-speed\/\">critical speed<\/a><\/li>\n<li>The application doesn&#8217;t demand extreme precision (G 6.3 or coarser)<\/li>\n<li>Examples: fan blades, grinding wheels, pulleys, brake discs, flywheels<\/li>\n<\/ul>\n<p>Two-plane balancing is required when the rotor has significant axial length, when couple unbalance is expected (e.g., after assembly from multiple components), or when high precision is needed.<\/p>\n<h2 id=\"common-mistakes\">Common Mistakes and Misconceptions<\/h2>\n<h3>1. Using Balancing Speed Instead of Service Speed<\/h3>\n<p>The most critical error in G-grade calculations. The tolerance formula requires the <em>maximum service speed<\/em> \u2014 the highest RPM the rotor reaches in actual operation. Low-speed balancing machines may run at 300\u2013600 RPM, but the tolerance must be calculated at operating speed (e.g., 3600 RPM). Using the balancing speed would give a tolerance 6\u201312\u00d7 too loose.<\/p>\n<h3>2. Confusing G-Grade with Vibration Level<\/h3>\n<p>G 2.5 does not mean the machine will vibrate at 2.5 mm\/s. The G-grade describes the peripheral velocity of the center of mass, not the vibration measured on the machine housing. Actual vibration depends on many additional factors: bearing stiffness, support structure, damping, and other vibration sources. A machine balanced to G 2.5 may measure 0.5 mm\/s or 5 mm\/s on the housing depending on these factors.<\/p>\n<h3>3. Over-Specifying Precision<\/h3>\n<p>Specifying G 1.0 when G 6.3 is sufficient wastes time and money. Each step tighter in G-grade roughly doubles the balancing effort and cost. A centrifugal pump impeller balanced to G 1.0 instead of G 6.3 costs significantly more to balance, but the pump likely won&#8217;t run any smoother because other vibration sources (<a href=\"https:\/\/vibromera.eu\/mn\/glossary\/misalignment\/\">misalignment<\/a>, <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/hydraulic-forces\/\">hydraulic forces<\/a>, bearing noise) dominate.<\/p>\n<h3>4. Ignoring Real-World Constraints<\/h3>\n<p>The calculated tolerance may be smaller than the balancing machine&#8217;s sensitivity or the achievable correction precision. If U<sub>per<\/sub> calculates to 0.5 g\u00b7mm but the balancing machine can only resolve to 1 g\u00b7mm, the specification cannot be met without better equipment. Always verify that the available balancing equipment can actually achieve the specified tolerance.<\/p>\n<h3>5. Not Accounting for Fit-Up Tolerances<\/h3>\n<p>A rotor balanced perfectly on a balancing machine may show unbalance when installed because of keyway clearances, coupling eccentricity, thermal growth, and mounting tolerances. For critical applications, the ISO standard recommends reserving 20\u201330% of the total tolerance for installation-related unbalance shifts.<\/p>\n<h3>6. Applying Rigid Rotor Standards to Flexible Rotors<\/h3>\n<p>ISO 21940-11 G-grades apply to <em>rigid rotors<\/em> \u2014 rotors that operate well below their first critical speed. Rotors that pass through or operate near critical speeds (<a href=\"https:\/\/vibromera.eu\/mn\/glossary\/flexible-rotor\/\">flexible rotors<\/a>) require balancing per <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/iso-21940-12\/\">ISO 21940-12<\/a>, which uses a fundamentally different approach. Applying G-grades to a flexible rotor can be dangerously inadequate.<\/p>\n<h2 id=\"importance\">Why Are G-Grades Important?<\/h2>\n<h3>Standardization and Communication<\/h3>\n<p>G-grades provide a universal language for balance quality. A manufacturer can specify that a pump impeller must be &#8220;balanced to G 6.3 per ISO 21940-11,&#8221; and any balancing facility worldwide will understand exactly what precision is required. This eliminates ambiguity, prevents disputes between suppliers and customers, and enables consistent quality across global supply chains.<\/p>\n<h3>Preventing Over-Balancing<\/h3>\n<p>Balancing a rotor to a tighter tolerance than necessary is expensive and time-consuming. Each G-grade step tighter approximately doubles the balancing cost because it requires more correction iterations, finer measurement capability, and longer machine time. G-grades help engineers select an economical level of precision that is &#8220;good enough&#8221; for the application without wasting resources on unnecessary precision.<\/p>\n<h3>Ensuring Reliability and Bearing Life<\/h3>\n<p>Selecting the correct G-grade ensures that the machine operates with acceptable vibration levels, directly reducing dynamic loads on bearings, seals, couplings, and supporting structures. The relationship between unbalance force and bearing life is dramatic: reducing unbalance by 50% can increase bearing L10 life by a factor of 8 (due to the cubic relationship in bearing life calculations). Proper balance quality is one of the most cost-effective reliability improvements available.<\/p>\n<h3>Regulatory and Contractual Compliance<\/h3>\n<p>Many industry standards and equipment specifications reference ISO G-grades as mandatory requirements. API standards for petroleum industry equipment, IEC standards for electric motors, and military specifications for defense equipment all reference or adopt the ISO G-grade system. Compliance with these requirements is often contractually binding and may be subject to audit or verification.<\/p>\n<h3>Predictive Maintenance Baseline<\/h3>\n<p>When a rotor is balanced to a known G-grade and the initial vibration level is documented, subsequent vibration measurements can be compared against this <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/baseline\/\">baseline<\/a>. Any increase in <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/running-speed\/\">1\u00d7 RPM<\/a> vibration immediately indicates developing unbalance (from erosion, buildup, part loss, or thermal bowing), enabling proactive <a href=\"https:\/\/vibromera.eu\/mn\/glossary\/predictive-maintenance\/\">maintenance<\/a> before damage occurs.<\/p>\n<div class=\"info-box success\">\n<div class=\"box-title\">Vibromera Balanset Equipment and G-Grades<\/div>\n<p>The <a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\">Balanset-1A<\/a> and <a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-4\/\">Balanset-4<\/a> portable balancing devices support G-grade specification directly in their software. Operators enter the desired G-grade, rotor mass, and operating speed, and the device automatically calculates the permissible tolerance and displays pass\/fail status during the balancing process. This eliminates manual calculation errors and ensures consistent compliance with ISO standards.<\/p>\n<\/p><\/div>\n<hr style=\"margin: 48px 0 24px; border: none; border-top: 1px solid var(--border-light);\">\n<p><a href=\"https:\/\/vibromera.eu\/mn\/glossary\/\">\u2190 Back to Glossary Index<\/a><\/p>\n<\/article>\n<p>      <!-- TOC SIDEBAR --><\/p>\n<aside class=\"toc-sidebar\">\n<div class=\"toc-box\">\n<h3>On This Page<\/h3>\n<p>          <a href=\"#calculator\">Unbalance Calculator<\/a><br \/>\n          <a href=\"#grade-overview\">G-Grade Overview<\/a><br \/>\n          <a href=\"#full-table\">Full ISO Table<\/a><br \/>\n          <a href=\"#definition\">Definition<\/a><br \/>\n          <a class=\"sub\" href=\"#definition\">Historical Context<\/a><br \/>\n          <a href=\"#how-it-works\">How G-Grades Work<\/a><br \/>\n          <a class=\"sub\" href=\"#how-it-works\">Core Formulas<\/a><br \/>\n          <a class=\"sub\" href=\"#how-it-works\">Variables Explained<\/a><br \/>\n          <a class=\"sub\" href=\"#how-it-works\">Geometric Interpretation<\/a><br \/>\n          <a href=\"#selecting\">Selecting a Grade<\/a><br \/>\n          <a class=\"sub\" href=\"#selecting\">Decision Factors<\/a><br \/>\n          <a class=\"sub\" href=\"#selecting\">Industry Recommendations<\/a><br \/>\n          <a href=\"#practical\">Practical Examples<\/a><br \/>\n          <a class=\"sub\" href=\"#practical\">Pump Impeller<\/a><br \/>\n          <a class=\"sub\" href=\"#practical\">Fan Rotor<\/a><br \/>\n          <a class=\"sub\" href=\"#practical\">Turbocharger<\/a><br \/>\n          <a href=\"#two-plane\">Two-Plane Balancing<\/a><br \/>\n          <a href=\"#common-mistakes\">Common Mistakes<\/a><br \/>\n          <a href=\"#importance\">Why It Matters<\/a>\n        <\/div>\n<div class=\"toc-box\" style=\"margin-top: 24px; background: var(--navy); border-color: var(--navy);\">\n<h3 style=\"color: var(--white);\">Vibromera Equipment<\/h3>\n<p style=\"color: rgba(255,255,255,0.6); font-size: 13px; margin-bottom: 12px;\">Portable balancing devices with built-in ISO G-grade tolerance calculation.<\/p>\n<p>          <a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-1\/\" style=\"display: block; padding: 8px 14px; background: var(--blue); color: white; border-radius: 6px; text-align: center; font-weight: 600; font-size: 14px; text-decoration: none; margin-bottom: 8px; border-left: none;\">Balanset-1A \u2192<\/a><br \/>\n          <a href=\"https:\/\/vibromera.eu\/mn\/product\/balanset-4\/\" style=\"display: block; padding: 8px 14px; background: rgba(255,255,255,0.1); color: white; border-radius: 6px; text-align: center; font-weight: 600; font-size: 14px; text-decoration: none; border: 1px solid rgba(255,255,255,0.2); border-left: none;\">Balanset-4 \u2192<\/a>\n        <\/div>\n<\/aside><\/div>\n<\/p><\/div>\n<p><\/main><\/p>\n<p><!-- SHOP CTA --><\/p>\n<section class=\"shop-cta\">\n<div class=\"container\">\n<h2>Professional Portable Balancing Equipment<\/h2>\n<p>Balance rotors to ISO G-grade standards in the field with Vibromera&#8217;s Balanset devices \u2014 built-in tolerance calculation, two-plane capability, professional results at accessible prices.<\/p>\n<p>    <a href=\"https:\/\/vibromera.eu\/mn\/shop\/\" class=\"cta-btn\">Browse Equipment \u2192<\/a>\n  <\/div>\n<\/section>\n<p><!-- FOOTER --><\/p>\n<footer class=\"page-footer\">\n<div class=\"container\">\n<p><a href=\"https:\/\/vibromera.eu\/mn\/glossary\/\">\u2190 Back to Glossary<\/a> &nbsp;|&nbsp; <a href=\"https:\/\/vibromera.eu\/mn\/\">vibromera.eu<\/a><\/p>\n<\/p><\/div>\n<\/footer>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/mn\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about Balance Quality Grades (G-Grades) from ISO standards, a system used to specify the permissible residual unbalance for different types of rotors.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,111],"tags":[],"class_list":["post-130","glossary","type-glossary","status-publish","hentry","category-glossary","category-rotor-balancing"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/glossary\/130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":5,"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/glossary\/130\/revisions"}],"predecessor-version":[{"id":101732,"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/glossary\/130\/revisions\/101732"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/media?parent=130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/categories?post=130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/mn\/wp-json\/wp\/v2\/tags?post=130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}