{"id":39,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/balancing-grade\/"},"modified":"2026-05-23T23:07:22","modified_gmt":"2026-05-23T23:07:22","slug":"balancing-grade","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/pa\/glossary\/balancing-grade\/","title":{"rendered":"What is Balancing Grade? ISO Standards and Classification"},"content":{"rendered":"<h1>Understanding Balancing Grade Classifications<\/h1>\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\/pa\/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\/pa\/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\/pa\/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\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\/pa\/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\/pa\/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\/pa\/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\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\/pa\/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\/pa\/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\/pa\/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\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\/pa\/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\/pa\/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\/pa\/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\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\/pa\/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\/pa\/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\/pa\/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\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\" 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class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/pa\/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=\"\/pa\/wp-json\/wp\/v2\/glossary\/39?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\" 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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>A <strong>balancing grade<\/strong> \u2014 also called a balance quality grade or <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/g-grade\/\">G-grade<\/a> \u2014 is a standardised classification that specifies how well a particular type of rotating machine must be balanced. Defined chiefly by <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/iso-21940-11\/\">ISO 21940-11<\/a> (the modern successor to ISO 1940-1), the grade system sorts equipment by its operating characteristics and assigns each category an appropriate <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/balancing-tolerance\/\">balancing tolerance<\/a>. Its great value is that it gives manufacturers, maintenance technicians and end users a single, internationally recognised language for specifying and verifying rotor <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/balance-quality\/\">balance quality<\/a>, so a &#8220;G6.3 pump&#8221; means the same thing in every workshop on earth.<\/p>\n<h2>1. The G-Grade System<\/h2>\n<p>Balancing grades are written as the letter &#8220;G&#8221; followed by a number \u2014 G2.5, G6.3, G16, and so on. The number is the product of the permissible residual <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/unbalance\/\">unbalance<\/a> eccentricity (in millimetres) and the maximum service angular velocity (in radians per second). Put more simply, it is the permissible unbalance vibration velocity expressed in <strong>mm\/s<\/strong> \u2014 the orbital speed of the rotor&#8217;s mass centre. That single figure neatly captures the physics that matters: a grade holds the rotating <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/centrifugal-force\/\">centrifugal force<\/a> within bounds the machine can tolerate.<\/p>\n<h3>The Key Principle<\/h3>\n<p>Lower G-numbers mean tighter requirements \u2014 less permissible residual unbalance and smoother running. Higher G-numbers allow more residual unbalance. The system deliberately recognises that different machines have vastly different needs depending on their speed, mass, application and operating environment; there is no single &#8220;good&#8221; number, only the number appropriate to the duty.<\/p>\n<h2>2. Common Grades and Their Applications<\/h2>\n<p>ISO 21940-11 defines grades from G0.4 (highest precision) all the way to G4000 (lowest). The grades most engineers actually meet are these:<\/p>\n<h3>G0.4 \u2014 Ultra-High Precision<\/h3>\n<p><strong>Applications:<\/strong> grinding-machine spindles, gyroscopes, precision measurement equipment.<\/p>\n<p><strong>Character:<\/strong> needs specialised balancing equipment and a controlled environment, and is normally done in a dedicated precision <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/balancing-machine\/\">balancing<\/a> shop.<\/p>\n<h3>G1.0 \u2014 High Precision<\/h3>\n<p><strong>Applications:<\/strong> high-precision machine-tool spindles, turbochargers, high-speed centrifuges, computer disc drives.<\/p>\n<p><strong>Character:<\/strong> demands careful control of every balancing parameter and high-quality instrumentation.<\/p>\n<h3>G2.5 \u2014 Precision Industrial<\/h3>\n<p><strong>Applications:<\/strong> gas and steam turbines, rigid turbo-generator rotors, compressors, machine-tool drives, medium and large electric motors with special requirements, and centrifugal separators.<\/p>\n<p><strong>Character:<\/strong> the benchmark for high-quality, high-speed industrial equipment, and readily achievable with sound <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/field-balancing\/\">field balancing<\/a> practice.<\/p>\n<h3>G6.3 \u2014 General Industrial (the most common grade)<\/h3>\n<p><strong>Applications:<\/strong> general-purpose electric motors, process-industry machinery, <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/centrifugal-pump-defects\/\">centrifugal pumps<\/a>, fans and blowers, gear units, general machinery rotors, and medium-speed compressors.<\/p>\n<p><strong>Character:<\/strong> the workhorse grade for most industrial machinery, striking a good balance between achievability and performance, and comfortably within reach of portable balancing equipment.<\/p>\n<h3>G16 \u2014 Heavy Industrial<\/h3>\n<p><strong>Applications:<\/strong> drive shafts (propeller and cardan shafts), multi-cylinder diesel engines with six or more cylinders, crushers, agricultural machinery, and individual engine components.<\/p>\n<p><strong>Character:<\/strong> suited to robust, slower-speed equipment that tolerates more vibration.<\/p>\n<h3>G40 and Higher \u2014 Very Heavy Industrial<\/h3>\n<p><strong>Applications:<\/strong> four-cylinder diesel engines (G40), rigidly mounted slow-speed machinery, and very large, slow-turning equipment.<\/p>\n<p><strong>Character:<\/strong> applied to massive, slow machines where precision balance is neither economic nor technically necessary.<\/p>\n<h2>3. How to Select the Right Grade<\/h2>\n<p>Choosing a grade is a matter of weighing several factors together:<\/p>\n<ul>\n<li><strong>Equipment type and design:<\/strong> the ISO 21940-11 tables map machine types to recommended grades and are the natural starting point.<\/li>\n<li><strong>Operating speed:<\/strong> faster machines generally need a tighter grade, because centrifugal force rises with the square of speed.<\/li>\n<li><strong>Mounting type:<\/strong> equipment on flexible foundations or isolation mounts can often tolerate a higher G-number than rigidly mounted equipment.<\/li>\n<li><strong>Proximity to people:<\/strong> machinery in occupied spaces may warrant a tighter grade for noise and safety.<\/li>\n<li><strong>Special requirements:<\/strong> medical, precision-manufacturing and aerospace applications often demand tighter balance than standard industrial practice.<\/li>\n<li><strong>Economics:<\/strong> every step to a tighter grade costs more, so the chosen grade should match operational need without over-specifying.<\/li>\n<\/ul>\n<h2>4. From Grade to Permissible Unbalance<\/h2>\n<p>The grade is the input to the calculation of the maximum permissible <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/residual-unbalance\/\">residual unbalance<\/a> for a specific rotor:<\/p>\n<blockquote><p><strong>U<sub>per<\/sub> (g\u00b7mm) = (9549 \u00d7 G \u00d7 M) \/ RPM<\/strong><\/p><\/blockquote>\n<ul>\n<li><strong>U<sub>per<\/sub><\/strong> = permissible residual unbalance, in gram-millimetres<\/li>\n<li><strong>G<\/strong> = the grade number (e.g. 6.3 for G6.3)<\/li>\n<li><strong>M<\/strong> = rotor mass, in kilograms<\/li>\n<li><strong>RPM<\/strong> = service speed, in revolutions per minute<\/li>\n<\/ul>\n<h3>Worked Example<\/h3>\n<p>Take a 100 kg fan rotor running at 1500 RPM, specified to G6.3:<\/p>\n<blockquote><p><strong>U<sub>per<\/sub> = (9549 \u00d7 6.3 \u00d7 100) \/ 1500 \u2248 401 g\u00b7mm<\/strong><\/p><\/blockquote>\n<p>If the <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/correction-plane\/\">correction plane<\/a> radius is 200 mm, that 401 g\u00b7mm corresponds to about 2.0 grams of permissible residual unbalance at that radius. The <a href=\"https:\/\/vibromera.eu\/pa\/calculators\/residual-unbalance-iso1940\/\">Residual Unbalance Calculator (ISO 21940-11)<\/a> performs this conversion instantly and then splits the total between two planes for you.<\/p>\n<h2>5. Variable-Speed and Multi-Speed Machines<\/h2>\n<p>When a machine runs across a range of speeds, the grade is applied with care:<\/p>\n<ul>\n<li><strong>Constant-speed operation:<\/strong> apply the grade at the normal operating speed.<\/li>\n<li><strong>Variable speed:<\/strong> apply the grade at the maximum continuous operating speed, where centrifugal forces are greatest.<\/li>\n<li><strong>Passing through critical speeds:<\/strong> for <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/flexible-rotor\/\">flexible rotors<\/a>, balance at the <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/critical-speed\/\">critical speeds<\/a> may need separate attention, potentially calling for <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/modal-balancing\/\">modal balancing<\/a> under <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/iso-21940-12\/\">ISO 21940-12<\/a>.<\/li>\n<\/ul>\n<h2>6. Verification and Acceptance<\/h2>\n<p>Once <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/balancing\/\">balancing<\/a> is finished, the achieved quality must be checked against the specified grade. There are two routes:<\/p>\n<ul>\n<li><strong>Direct unbalance measurement:<\/strong> on a balancing machine, the residual unbalance is read directly and compared with U<sub>per<\/sub>.<\/li>\n<li><strong>Vibration measurement:<\/strong> in field balancing, the 1\u00d7 vibration amplitude serves as an indirect indicator of balance quality.<\/li>\n<\/ul>\n<p>The rotor is accepted when the measured residual unbalance is at or below the calculated U<sub>per<\/sub>, <em>or<\/em> when the in-service vibration meets the applicable severity standard \u2014 today the <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/iso-20816-1\/\">ISO 20816<\/a> series (which replaced ISO 10816). On an installed machine this verification is done on-site: a portable two-channel instrument such as the <a href=\"https:\/\/vibromera.eu\/pa\/product\/balanset-1\/\">Balanset-1A<\/a> measures the 1\u00d7 <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/phase\/\">amplitude and phase<\/a> in the machine&#8217;s own bearings at operating speed, computes the <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/influence-coefficient\/\">influence coefficients<\/a>, applies the correction, and confirms the residual sits within the chosen grade \u2014 without removing the rotor.<\/p>\n<h2>7. From ISO 1940 to ISO 21940<\/h2>\n<p>The G-grade system was first established in ISO 1940-1, originally published in 1986. In 2016 the ISO 1940 series was revised and renumbered as the ISO 21940 series, with ISO 21940-11 replacing ISO 1940-1. The fundamental principles and grade values were carried over essentially unchanged, so older specifications remain valid, but the modern standard adds:<\/p>\n<ul>\n<li>Updated equipment classifications.<\/li>\n<li>Clearer guidance on grade selection.<\/li>\n<li>Better integration with the wider family of rotor-dynamics standards.<\/li>\n<li>Improved procedures for flexible rotors.<\/li>\n<\/ul>\n<h2>8. Common Misconceptions<\/h2>\n<h3>&#8220;Tighter is always better&#8221;<\/h3>\n<p><strong>Reality:<\/strong> over-specifying balance quality raises cost with no proportional benefit. A machine balanced to G2.5 will not necessarily outperform the same machine at G6.3 where G6.3 is the correct grade for the duty.<\/p>\n<h3>&#8220;Grade equals vibration level&#8221;<\/h3>\n<p><strong>Reality:<\/strong> the G-number represents permissible unbalance eccentricity, not vibration amplitude. The actual <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/vibration\/\">vibration<\/a> a machine shows depends on many factors beyond balance \u2014 stiffness, damping, <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/resonance\/\">resonance<\/a>, <a href=\"https:\/\/vibromera.eu\/pa\/glossary\/misalignment\/\">misalignment<\/a> and looseness among them.<\/p>\n<h3>&#8220;One grade fits the whole plant&#8221;<\/h3>\n<p><strong>Reality:<\/strong> different machine types need different grades even within one facility. A precision grinder and a crusher have wildly different balance requirements and should never share a single blanket specification.<\/p>\n<h2>9. Documentation and Specifications<\/h2>\n<p>When commissioning balancing work, the specification should state clearly:<\/p>\n<ul>\n<li>The required grade and standard \u2014 for example, &#8220;Balance to G6.3 per ISO 21940-11&#8221;.<\/li>\n<li>The service speed to be used for the tolerance calculation.<\/li>\n<li>The number of correction planes required.<\/li>\n<li>The verification method \u2014 shop balancing machine or field vibration measurement.<\/li>\n<\/ul>\n<p>A clear, complete specification of this kind removes ambiguity and gives both the balancer and the customer a defensible record of what was required and what was achieved.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/pa\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about balancing grades, the classification system defined by ISO 21940 that categorizes machinery types according to their required balance quality and permissible unbalance levels.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,112],"tags":[],"class_list":["post-39","glossary","type-glossary","status-publish","hentry","category-glossary","category-iso-standards"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/glossary\/39","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/glossary\/39\/revisions"}],"predecessor-version":[{"id":101468,"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/glossary\/39\/revisions\/101468"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/media?parent=39"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/categories?post=39"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/pa\/wp-json\/wp\/v2\/tags?post=39"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}