{"id":30458,"date":"2026-02-06T05:50:29","date_gmt":"2026-02-06T05:50:29","guid":{"rendered":"https:\/\/hardnesstests.com\/?p=30458"},"modified":"2026-02-06T05:50:32","modified_gmt":"2026-02-06T05:50:32","slug":"hardness-testing-for-metals-complete-guide-32-essential-insights-for-reliable-material-evaluation","status":"publish","type":"post","link":"https:\/\/hardnesstests.com\/nl\/hardness-testing-for-metals-complete-guide-32-essential-insights-for-reliable-material-evaluation\/","title":{"rendered":"Hardness Testing for Metals Complete Guide 32 Essential Insights for Reliable Material Evaluation"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-outline-for-the-article-on-hardness-testing-for-metals\"><strong>Outline for the Article on Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Onderwerp<\/strong><\/th><th><strong>Gedetailleerde dekking met LSI-zoekwoorden<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Introduction to Hardness Testing for Metals<\/td><td>metal hardness measurement<\/td><\/tr><tr><td>What Is Hardness Testing for Metals<\/td><td>metallic material testing<\/td><\/tr><tr><td>History of Metal Hardness Testing<\/td><td>evolution of hardness methods<\/td><\/tr><tr><td>Why Hardness Testing for Metals Is Important<\/td><td>strength, wear resistance<\/td><\/tr><tr><td>Basic Principle of Metal Hardness Testing<\/td><td>weerstand tegen indrukken<\/td><\/tr><tr><td>Common Metal Hardness Testing Methods<\/td><td>Brinell, Rockwell, Vickers<\/td><\/tr><tr><td>Brinell Hardness Testing for Metals<\/td><td>bulk metal testing<\/td><\/tr><tr><td>Rockwell hardheidsmeting voor metalen<\/td><td>rapid hardness measurement<\/td><\/tr><tr><td>Vickers Hardness Testing for Metals<\/td><td>universal hardness method<\/td><\/tr><tr><td>Knoop Hardness Testing for Metals<\/td><td>microhardheid testen<\/td><\/tr><tr><td>Leeb Hardness Testing for Metals<\/td><td>portable metal testing<\/td><\/tr><tr><td>Shore Hardness Testing for Metals<\/td><td>soft metal evaluation<\/td><\/tr><tr><td>Hardness Scales Used for Metals<\/td><td>HB, HRC, HV<\/td><\/tr><tr><td>Relationship Between Hardness and Strength<\/td><td>tensile correlation<\/td><\/tr><tr><td>Hardness Testing for Ferrous Metals<\/td><td>steel, cast iron<\/td><\/tr><tr><td>Hardheidsmeting voor non-ferrometalen<\/td><td>aluminum, copper alloys<\/td><\/tr><tr><td>Hardness Testing for Heat-Treated Metals<\/td><td>procesverificatie<\/td><\/tr><tr><td>Hardness Testing for Welded Metals<\/td><td>laskwaliteit<\/td><\/tr><tr><td>Hardness Testing for Coated Metals<\/td><td>surface evaluation<\/td><\/tr><tr><td>Hardness Testing in Manufacturing<\/td><td>productie-inspectie<\/td><\/tr><tr><td>Hardness Testing in Quality Control<\/td><td>compliance verification<\/td><\/tr><tr><td>Hardness Testing in R&amp;D<\/td><td>materi\u00eble ontwikkeling<\/td><\/tr><tr><td>Nauwkeurigheid en herhaalbaarheid<\/td><td>betrouwbare meting<\/td><\/tr><tr><td>Factors Affecting Metal Hardness Results<\/td><td>surface, load, thickness<\/td><\/tr><tr><td>Sample Preparation for Metal Hardness Testing<\/td><td>polishing, cleaning<\/td><\/tr><tr><td>Standards for Metal Hardness Testing<\/td><td>ASTM, ISO<\/td><\/tr><tr><td>Calibration of Hardness Testers<\/td><td>referentieblokken<\/td><\/tr><tr><td>Advantages of Hardness Testing for Metals<\/td><td>efficiency, reliability<\/td><\/tr><tr><td>Beperkingen van hardheidsmetingen<\/td><td>methodebeperkingen<\/td><\/tr><tr><td>Choosing the Right Hardness Test for Metals<\/td><td>selectiegids<\/td><\/tr><tr><td>Johoyd Metal Hardness Testing Solutions<\/td><td>merkexpertise<\/td><\/tr><tr><td>Future Trends in Metal Hardness Testing<\/td><td>automatisering<\/td><\/tr><tr><td>FAQs<\/td><td>veelvoorkomende vragen<\/td><\/tr><tr><td>Conclusie<\/td><td>samenvatting<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Inleiding<\/strong><\/h2>\n\n\n\n<p><strong>Hardness testing for metals<\/strong> is one of the most widely used methods for evaluating material strength, durability, and resistance to wear. From steel and aluminum to advanced alloys, hardness testing provides critical insight into how a metal will perform under mechanical stress, friction, and long-term service conditions.<\/p>\n\n\n\n<p>In manufacturing, quality control, and research laboratories, hardness testing serves as a fast, reliable, and cost-effective way to verify material properties. Unlike destructive mechanical tests, hardness testing often requires minimal sample preparation and leaves only a small indentation. This article offers a comprehensive guide to hardness testing for metals, including testing methods, hardness scales, applications, standards, and best practices.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p><strong>Hardness testing for metals<\/strong> measures a metal\u2019s resistance to permanent surface deformation when a controlled force is applied.<\/p>\n\n\n\n<p>Harder metals resist indentation more effectively.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Is Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Hardness testing for metals is a mechanical test that evaluates how a metal reacts to indentation, penetration, or impact under a defined load.<\/p>\n\n\n\n<p>It reflects strength and wear resistance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>History of Metal Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Metal hardness testing began in the early twentieth century with the development of the Brinell test, followed by Rockwell and Vickers methods.<\/p>\n\n\n\n<p>Standardization improved consistency across industries.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Hardness Testing for Metals Is Important<\/strong><\/h2>\n\n\n\n<p>Hardness testing ensures metals meet design specifications, safety standards, and performance expectations.<\/p>\n\n\n\n<p>It prevents premature failure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Basic Principle of Metal Hardness Testing<\/strong><\/h2>\n\n\n\n<p>A standardized indenter is pressed into a metal surface under a specific load. The resulting indentation size or depth is measured to determine hardness.<\/p>\n\n\n\n<p>Resistance defines hardness value.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Common Metal Hardness Testing Methods<\/strong><\/h2>\n\n\n\n<p>Several methods are used depending on material type, thickness, and application:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brinell<\/li>\n\n\n\n<li>Rockwell<\/li>\n\n\n\n<li>Vickers<\/li>\n\n\n\n<li>Knoop<\/li>\n\n\n\n<li>Leeb<\/li>\n\n\n\n<li>Kust<\/li>\n<\/ul>\n\n\n\n<p>Each method serves a distinct purpose.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Brinell Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Brinell testing uses a hardened steel or tungsten carbide ball and is ideal for soft to medium-hard metals.<\/p>\n\n\n\n<p>Common for castings and large metal components.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Rockwell hardheidsmeting voor metalen<\/strong><\/h2>\n\n\n\n<p>Rockwell testing measures indentation depth and provides fast, direct hardness readings.<\/p>\n\n\n\n<p>Popular for steel and heat-treated metals.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Vickers Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Vickers testing uses a diamond pyramid indenter and is suitable for a wide range of metals.<\/p>\n\n\n\n<p>Highly versatile and precise.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Knoop Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Knoop testing evaluates microhardness of thin metal sections and surface layers.<\/p>\n\n\n\n<p>Ideal for coatings and microstructures.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Leeb Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Leeb testing is a portable method that measures rebound velocity.<\/p>\n\n\n\n<p>Perfect for large or installed metal parts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Shore Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<p>Shore testing is occasionally used for very soft metals or metal-polymer composites.<\/p>\n\n\n\n<p>Limited use in metallic testing.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Scales Used for Metals<\/strong><\/h2>\n\n\n\n<p>Common metal hardness scales include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brinell (HB)<\/li>\n\n\n\n<li>Rockwell (HRC, HRB)<\/li>\n\n\n\n<li>Vickers (HV)<\/li>\n\n\n\n<li>Knoop (HK)<\/li>\n\n\n\n<li>Leeb (HL)<\/li>\n<\/ul>\n\n\n\n<p>Scale selection depends on application.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Relationship Between Hardness and Strength<\/strong><\/h2>\n\n\n\n<p>Hardness often correlates with tensile strength, especially in steels.<\/p>\n\n\n\n<p>This relationship supports rapid quality checks.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing for Ferrous Metals<\/strong><\/h2>\n\n\n\n<p>Ferrous metals such as steel and cast iron are commonly tested using Rockwell, Brinell, and Vickers methods.<\/p>\n\n\n\n<p>Heat treatment verification is critical.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardheidsmeting voor non-ferrometalen<\/strong><\/h2>\n\n\n\n<p>Aluminum, copper, brass, and alloys require lower loads and careful scale selection.<\/p>\n\n\n\n<p>Vickers and Brinell are widely used.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing for Heat-Treated Metals<\/strong><\/h2>\n\n\n\n<p>Hardness testing confirms correct heat treatment processes such as quenching and tempering.<\/p>\n\n\n\n<p>Ensures mechanical performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing for Welded Metals<\/strong><\/h2>\n\n\n\n<p>Hardness testing evaluates weld zones and heat-affected areas.<\/p>\n\n\n\n<p>Detects brittleness or improper welding.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing for Coated Metals<\/strong><\/h2>\n\n\n\n<p>Microhardness testing evaluates thin surface coatings without substrate interference.<\/p>\n\n\n\n<p>Critical for surface engineering.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-800x800.jpg\" alt=\"\" class=\"wp-image-30277\" srcset=\"https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-800x800.jpg 800w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-300x300.jpg 300w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-150x150.jpg 150w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-768x768.jpg 768w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-12x12.jpg 12w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-400x400.jpg 400w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25-700x700.jpg 700w, https:\/\/hardnesstests.com\/wp-content\/uploads\/2026\/01\/25.jpg 1200w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Versie 1.0.0<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing in Manufacturing<\/strong><\/h2>\n\n\n\n<p>Manufacturers rely on hardness testing for in-process inspection and final product verification.<\/p>\n\n\n\n<p>Fast feedback improves efficiency.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing in Quality Control<\/strong><\/h2>\n\n\n\n<p>Quality control teams use hardness testing to ensure consistency and compliance with standards.<\/p>\n\n\n\n<p>Reduces production risk.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hardness Testing in R&amp;D<\/strong><\/h2>\n\n\n\n<p>R&amp;D laboratories use hardness testing to study new alloys, treatments, and microstructures.<\/p>\n\n\n\n<p>Supports material innovation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Nauwkeurigheid en herhaalbaarheid<\/strong><\/h2>\n\n\n\n<p>Proper calibration and test procedures ensure reliable and repeatable hardness results.<\/p>\n\n\n\n<p>Consistentie schept vertrouwen.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Factors Affecting Metal Hardness Results<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Surface roughness<\/li>\n\n\n\n<li>Sample thickness<\/li>\n\n\n\n<li>Indenter type<\/li>\n\n\n\n<li>Test load<\/li>\n\n\n\n<li>Dwell time<\/li>\n<\/ul>\n\n\n\n<p>Controlled conditions improve accuracy.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Sample Preparation for Metal Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Surfaces should be flat, clean, and smooth to ensure accurate indentation measurement.<\/p>\n\n\n\n<p>Preparation reduces measurement error.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Standards for Metal Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Metal hardness testing follows international standards such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASTM E10, E18, E384<\/li>\n\n\n\n<li>ISO 6506, 6507, 6508<\/li>\n<\/ul>\n\n\n\n<p>Standards ensure global comparability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Calibration of Hardness Testers<\/strong><\/h2>\n\n\n\n<p>Calibration with certified reference blocks maintains accuracy and traceability.<\/p>\n\n\n\n<p>Regular calibration is essential.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Advantages of Hardness Testing for Metals<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fast and cost-effective<\/li>\n\n\n\n<li>Minimal sample damage<\/li>\n\n\n\n<li>Suitable for production and laboratory use<\/li>\n\n\n\n<li>Sterke correlatie met mechanische eigenschappen<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Beperkingen van hardheidsmetingen<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not a direct substitute for tensile testing<\/li>\n\n\n\n<li>Results depend on method and preparation<\/li>\n\n\n\n<li>Thin samples require microhardness methods<\/li>\n<\/ul>\n\n\n\n<p>Understanding limits ensures correct interpretation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Choosing the Right Hardness Test for Metals<\/strong><\/h2>\n\n\n\n<p>Selection depends on material type, thickness, required accuracy, and testing environment.<\/p>\n\n\n\n<p>Correct method ensures meaningful results.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Johoyd Metal Hardness Testing Solutions<\/strong><\/h2>\n\n\n\n<p>Betrouwbaar <strong>hardness testing for metals<\/strong> requires accurate and durable equipment. <strong>Johoyd<\/strong>, door <strong><a href=\"https:\/\/hardnesstests.com\/nl\/\">https:\/\/hardnesstests.com<\/a><\/strong>, offers a complete range of hardness testing solutions for metals, including Rockwell, Brinell, Vickers, Leeb, and microhardness systems. Johoyd equipment meets ASTM and ISO standards, supporting manufacturing, quality control, and research laboratories worldwide.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Future Trends in Metal Hardness Testing<\/strong><\/h2>\n\n\n\n<p>Automation, digital data analysis, portable testers, and smart manufacturing integration are shaping the future.<\/p>\n\n\n\n<p>Technology continues improving speed and reliability.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Veelgestelde vragen<\/strong><\/h2>\n\n\n\n<p><strong>What is hardness testing for metals used for?<\/strong><br>Evaluating strength, wear resistance, and material consistency.<\/p>\n\n\n\n<p><strong>Which hardness test is best for steel?<\/strong><br>Rockwell en Vickers worden vaak gebruikt.<\/p>\n\n\n\n<p><strong>Zijn hardheidsmetingen destructief?<\/strong><br>It leaves small indentations but is generally non-destructive.<\/p>\n\n\n\n<p><strong>Can hardness values be converted between scales?<\/strong><br>Yes, approximate conversions are available.<\/p>\n\n\n\n<p><strong>Does hardness testing require surface preparation?<\/strong><br>Yes, proper surface condition improves accuracy.<\/p>\n\n\n\n<p><strong>How often should hardness testers be calibrated?<\/strong><br>According to standards and usage frequency.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusie<\/strong><\/h2>\n\n\n\n<p><strong>Hardness testing for metals<\/strong> is an essential process for ensuring material reliability, strength, and performance across industries. By using appropriate methods and standards, manufacturers and laboratories can quickly verify material properties with confidence.<\/p>\n\n\n\n<p>With advanced metal hardness testing solutions from <strong>Johoyd<\/strong> op <strong>hardnesstests.com<\/strong>, organizations can achieve accurate, repeatable, and standards-compliant results. Choosing the right hardness testing method ensures quality, safety, and long-term performance of metal components.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Aanbevolen interne koppelingen<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rockwell hardheidsmeter<\/li>\n\n\n\n<li>Microhardness Testing Machine<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Aanbevolen uitgaande links<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ASTM Metal Hardness Testing Standards<\/li>\n\n\n\n<li>ISO Hardness Testing Standards<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Outline for the Article on Hardness Testing for Metals Topic Area Detailed Coverage with LSI Keywords Introduction to Hardness Testing<\/p>","protected":false},"author":4,"featured_media":30256,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[],"class_list":["post-30458","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardness-tester"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v27.1.1) - 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