{"id":3395,"date":"2025-08-02T15:23:40","date_gmt":"2025-08-02T15:23:40","guid":{"rendered":"https:\/\/desktopequip.com\/?p=3395"},"modified":"2025-08-02T15:23:40","modified_gmt":"2025-08-02T15:23:40","slug":"precision-grades-and-standards-for-plastic-injection-molding-parts","status":"publish","type":"post","link":"https:\/\/www.origmaker.cn\/index.php\/2025\/08\/02\/precision-grades-and-standards-for-plastic-injection-molding-parts\/","title":{"rendered":"Precision Grades and Standards for Plastic Injection Molding Parts"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Precision Grades and Standards for Plastic Injection Molding Parts<\/h1>\n\n\n\n<p>Dimensional precision plays a critical role in the performance, assembly, and appearance of plastic injection-molded parts. Different applications demand varying levels of precision, and understanding the relevant standards helps ensure effective material selection, part design, and quality control.<\/p>\n\n\n\n<p>This article introduces the commonly used dimensional tolerance standards in plastic injection molding\u2014including national and international standards\u2014along with specific numerical values for each grade.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. What Is Dimensional Precision in Plastic Parts?<\/h2>\n\n\n\n<p>The precision of an injection-molded plastic part refers to the allowable deviation of its actual dimensions from its nominal (designed) dimensions, typically expressed as <strong>dimensional tolerance<\/strong>. The smaller the tolerance, the higher the precision\u2014requiring tighter mold manufacturing, better materials, and more stable processing conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Common Standards for Injection Molding Precision<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.1 GB\/T 14486-2008 (China National Standard)<\/strong><\/h3>\n\n\n\n<p>This standard applies to both thermoplastic and thermoset molded plastic parts. It classifies dimensional tolerances into <strong>11 grades (IT0 to IT10)<\/strong>, with <strong>lower numbers indicating higher precision<\/strong>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udccc Tolerance Values by Precision Grade (Unit: mm)<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Grade<\/th><th>Nominal Dimension Range (mm)<\/th><th>Max Permissible Deviation \u00b1 (mm)<\/th><\/tr><\/thead><tbody><tr><td><strong>IT3<\/strong><\/td><td>1.0 ~ 3.2<\/td><td>0.02<\/td><\/tr><tr><td><\/td><td>3.2 ~ 6.3<\/td><td>0.03<\/td><\/tr><tr><td><\/td><td>6.3 ~ 10<\/td><td>0.04<\/td><\/tr><tr><td><strong>IT5<\/strong><\/td><td>1.0 ~ 3.2<\/td><td>0.06<\/td><\/tr><tr><td><\/td><td>3.2 ~ 6.3<\/td><td>0.08<\/td><\/tr><tr><td><\/td><td>6.3 ~ 10<\/td><td>0.10<\/td><\/tr><tr><td><strong>IT7<\/strong><\/td><td>1.0 ~ 3.2<\/td><td>0.12<\/td><\/tr><tr><td><\/td><td>3.2 ~ 6.3<\/td><td>0.16<\/td><\/tr><tr><td><\/td><td>6.3 ~ 10<\/td><td>0.20<\/td><\/tr><tr><td><strong>IT9<\/strong><\/td><td>1.0 ~ 3.2<\/td><td>0.24<\/td><\/tr><tr><td><\/td><td>3.2 ~ 6.3<\/td><td>0.32<\/td><\/tr><tr><td><\/td><td>6.3 ~ 10<\/td><td>0.40<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>Grades IT0\u2013IT2 are typically used only for high-precision or micro-scale components.<\/em><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.2 DIN 16742 (German Standard)<\/strong><\/h3>\n\n\n\n<p>DIN 16742 classifies plastics into <strong>material groups based on shrinkage rate<\/strong>, and provides corresponding tolerance values. This standard is widely used in Europe, especially in automotive and industrial sectors.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udccc Material Groups and Shrinkage Rates<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Group<\/th><th>Shrinkage Range<\/th><th>Typical Materials<\/th><\/tr><\/thead><tbody><tr><td>Group 1<\/td><td>\u2264 0.2%<\/td><td>ABS, PC, SAN<\/td><\/tr><tr><td>Group 2<\/td><td>0.2%\u20130.5%<\/td><td>POM, PS, PMMA<\/td><\/tr><tr><td>Group 3<\/td><td>0.5%\u20131.0%<\/td><td>PA6, PP, PA66<\/td><\/tr><tr><td>Group 4<\/td><td>1.0%\u20132.0%<\/td><td>HDPE, LDPE<\/td><\/tr><tr><td>Group 5<\/td><td>\u2265 2.0%<\/td><td>Flexible PVC, TPU<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udccc Example Tolerances for Group 3 (Medium Precision)<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nominal Dimension (mm)<\/th><th>Tolerance \u00b1 (mm)<\/th><\/tr><\/thead><tbody><tr><td>0.5 ~ 1.0<\/td><td>0.05<\/td><\/tr><tr><td>1.0 ~ 3.0<\/td><td>0.10<\/td><\/tr><tr><td>3.0 ~ 6.0<\/td><td>0.14<\/td><\/tr><tr><td>6.0 ~ 10.0<\/td><td>0.18<\/td><\/tr><tr><td>10.0 ~ 18.0<\/td><td>0.22<\/td><\/tr><tr><td>18.0 ~ 30.0<\/td><td>0.28<\/td><\/tr><tr><td>30.0 ~ 50.0<\/td><td>0.34<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>High precision tolerances may be reduced by 50%, while loose tolerances may be increased by about 30%.<\/em><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2.3 ISO 20457:2018 (International Standard)<\/strong><\/h3>\n\n\n\n<p>This ISO standard defines globally accepted tolerances for injection-molded plastic parts. It takes into account <strong>nominal size ranges and material shrinkage<\/strong> to guide allowable dimensional deviations.<\/p>\n\n\n\n<p>ISO 20457 is widely adopted in international production and trade, and its tolerance ranges closely align with DIN 16742.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Summary Table: General Dimensional Tolerances<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nominal Size (mm)<\/th><th>High Precision (\u00b1mm)<\/th><th>Medium Precision (\u00b1mm)<\/th><th>Low Precision (\u00b1mm)<\/th><\/tr><\/thead><tbody><tr><td>0.5 ~ 1.0<\/td><td>0.02 ~ 0.05<\/td><td>0.05 ~ 0.10<\/td><td>0.10 ~ 0.20<\/td><\/tr><tr><td>1.0 ~ 3.0<\/td><td>0.03 ~ 0.06<\/td><td>0.10 ~ 0.15<\/td><td>0.20 ~ 0.30<\/td><\/tr><tr><td>3.0 ~ 10<\/td><td>0.04 ~ 0.08<\/td><td>0.15 ~ 0.25<\/td><td>0.30 ~ 0.50<\/td><\/tr><tr><td>10 ~ 50<\/td><td>0.10 ~ 0.20<\/td><td>0.30 ~ 0.50<\/td><td>0.50 ~ 1.00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. Key Factors Affecting Precision in Injection Molding<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Mold Manufacturing Accuracy<\/strong><br>The accuracy of the mold cavity directly determines the dimensional outcome of the molded part, especially for features like holes and fit interfaces.<\/li>\n\n\n\n<li><strong>Material Shrinkage Behavior<\/strong><br>Different plastics have different shrinkage rates, and this must be considered in both mold design and tolerance assignment.<\/li>\n\n\n\n<li><strong>Processing Parameters<\/strong><br>Injection speed, mold temperature, holding pressure, and cooling time can all significantly affect part dimensions and warping.<\/li>\n\n\n\n<li><strong>Part Design<\/strong><br>Uneven wall thickness, lack of fillets or ribs, and asymmetrical geometry can cause deformation and tolerance deviation.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">5. How to Choose the Right Tolerance Grade<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Evaluate the part\u2019s function<\/strong>: Does it involve mechanical fit, motion, or tight assembly?<\/li>\n\n\n\n<li><strong>Analyze material shrinkage<\/strong> and flow behavior<\/li>\n\n\n\n<li><strong>Refer to applicable standards<\/strong>: GB\/T, DIN, or ISO<\/li>\n\n\n\n<li><strong>Confirm mold capabilities and injection process stability<\/strong><\/li>\n\n\n\n<li><strong>Consult with molders<\/strong> during DFM (Design for Manufacturing)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Precision Should Be \u201cAppropriate,\u201d Not \u201cExcessive\u201d<\/h2>\n\n\n\n<p>Unnecessarily tight tolerances increase mold manufacturing costs, reduce yield rates, and complicate production. Always aim to select a <strong>tolerance grade that satisfies function while minimizing cost and manufacturing risk<\/strong>.<\/p>\n\n\n\n<p>If you need a tolerance standard template, customized part design consultation, or injection molding support, feel free to contact our engineering team\u2014we\u2019re ready to help.<\/p>\n\n\n\n<p>Would you like this translated article exported as <code>.html<\/code>, <code>.docx<\/code>, or <code>.pdf<\/code> for web publishing or client use?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Precision Grades and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3395","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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