{"id":2994,"date":"2026-03-18T03:00:46","date_gmt":"2026-03-18T03:00:46","guid":{"rendered":"https:\/\/www.sapphiretube.com\/?post_type=product&p=2994"},"modified":"2026-03-18T03:00:46","modified_gmt":"2026-03-18T03:00:46","slug":"precision-engineered-through-hole-ruby-bearing-with-extreme-hardness-mohs-9-and-synthetic-single-crystal-ruby-for-minimizing-friction-and-wear","status":"publish","type":"product","link":"https:\/\/www.sapphiretube.com\/ko\/product\/precision-engineered-through-hole-ruby-bearing-with-extreme-hardness-mohs-9-and-synthetic-single-crystal-ruby-for-minimizing-friction-and-wear\/","title":{"rendered":"Precision-Engineered Through-Hole Ruby Bearing with Extreme Hardness (Mohs 9) and Synthetic Single-Crystal Ruby for Minimizing Friction and Wear"},"content":{"rendered":"

Ruby Through-Hole Bearing \u2013 Precision Jewel Bearing for High-Accuracy Instruments<\/strong><\/h1>\n

The\u00a0Ruby Through-Hole Bearing<\/strong>\u00a0is a precision-engineered jewel component made from synthetic ruby (single-crystal Al\u2082O\u2083 with Cr doping). Known for its exceptional hardness, low friction, and excellent dimensional stability, this bearing is widely used in measuring instruments, micro-mechanical assemblies, watches, and high-precision scientific equipment.<\/p>\n

Thanks to its\u00a0wear resistance, chemical inertness, and long service life<\/strong>, the ruby through-hole bearing has become a preferred solution for applications where precise rotational movement and minimal friction are essential.<\/p>\n

\"\"\u00a0 \u00a0 \"\"<\/h2>\n

Product Features<\/strong><\/h2>\n

1. Outstanding Hardness & Wear Resistance<\/strong><\/h3>\n

Ruby, with a hardness of Mohs 9, resists abrasion, surface deformation, and dimensional drift even under continuous rotational loading.<\/p>\n

    \n
  • \n

    Maintains long-term accuracy<\/p>\n<\/li>\n

  • \n

    Extremely low material wear<\/p>\n<\/li>\n

  • \n

    Suitable for high-frequency micro-rotors and pointer mechanisms<\/p>\n<\/li>\n<\/ul>\n

    2. Ultra-Smooth Low-Friction Rotation<\/strong><\/h3>\n

    \"\"The polished inner bore provides:<\/p>\n

      \n
    • \n

      Very low friction coefficient<\/p>\n<\/li>\n

    • \n

      Smooth and stable rotational behavior<\/p>\n<\/li>\n

    • \n

      Improved repeatability of measurement instruments<\/p>\n<\/li>\n<\/ul>\n

      This makes it ideal for dial indicators, precision meters, and sensitive rotational modules.<\/p>\n

      3. High Thermal & Chemical Stability<\/strong><\/h3>\n

      Ruby is stable in harsh environments:<\/p>\n

        \n
      • \n

        Heat resistance above 1000\u00b0C<\/p>\n<\/li>\n

      • \n

        Chemical inertness against acids and common solvents<\/p>\n<\/li>\n

      • \n

        No oxidation or aging over long-term use<\/p>\n<\/li>\n<\/ul>\n

        Suitable for laboratories, cleanrooms, and industrial environments.<\/p>\n

        4. Customizable Precision & Dimensions<\/strong><\/h3>\n

        We support complete customization to meet instrument and OEM requirements:<\/p>\n

          \n
        • \n

          Inner hole diameter: 0.2\u201320 mm<\/p>\n<\/li>\n

        • \n

          Outer diameter: 1\u201350 mm<\/p>\n<\/li>\n

        • \n

          Thickness: 0.2\u201310 mm<\/p>\n<\/li>\n

        • \n

          Inner\/outer chamfering<\/p>\n<\/li>\n

        • \n

          Optical polishing or matte finish<\/p>\n<\/li>\n

        • \n

          Special shapes (ring, crown, stepped hole, tapered hole)<\/p>\n<\/li>\n<\/ul>\n

          \n

          <\/h2>\n

          Manufacturing Technology<\/strong><\/h1>\n

          \"\"Ultrasonic Drilling \/ Fine CNC Machining<\/strong><\/h3>\n

          Creates precise through-holes with minimal edge chipping and excellent roundness.<\/p>\n

          High-Precision Lapping & Polishing<\/strong><\/h3>\n
            \n
          • \n

            Bore roundness: \u22640.01 mm<\/p>\n<\/li>\n

          • \n

            Surface roughness (Ra): <0.02 \u03bcm<\/p>\n<\/li>\n

          • \n

            Excellent dimensional repeatability<\/p>\n<\/li>\n<\/ul>\n

            Ensures smooth, friction-free operation in micro-mechanical systems.<\/p>\n

            Crystal Orientation Control<\/strong><\/h3>\n

            Single-crystal ruby allows precise control of physical properties, improving stability during long-term operation.<\/p>\n

            \n

            <\/h1>\n

            Applications<\/strong><\/h1>\n

            The ruby through-hole bearing is widely adopted in industries that require ultra-precise rotational components:<\/p>\n

            Precision Instruments<\/strong><\/h3>\n
              \n
            • \n

              Dial indicators<\/p>\n<\/li>\n

            • \n

              Micrometers<\/p>\n<\/li>\n

            • \n

              Analytical instruments<\/p>\n<\/li>\n

            • \n

              Balance and scale mechanisms<\/p>\n<\/li>\n<\/ul>\n

              \"\"Measuring & Control Systems<\/strong><\/h3>\n
                \n
              • \n

                Sensor modules<\/p>\n<\/li>\n

              • \n

                Pointer mechanisms<\/p>\n<\/li>\n

              • \n

                Micro-actuators<\/p>\n<\/li>\n<\/ul>\n

                Watchmaking & Micro-Mechanics<\/strong><\/h3>\n
                  \n
                • \n

                  Mechanical watch jewel bearings<\/p>\n<\/li>\n

                • \n

                  Micro-rotor modules<\/p>\n<\/li>\n

                • \n

                  Timekeeping movement supports<\/p>\n<\/li>\n<\/ul>\n

                  Medical & Scientific Equipment<\/strong><\/h3>\n
                    \n
                  • \n

                    Lab automation<\/p>\n<\/li>\n

                  • \n

                    Sample handling mechanisms<\/p>\n<\/li>\n

                  • \n

                    Optical positioning assemblies<\/p>\n<\/li>\n<\/ul>\n

                    Electronics & Semiconductor<\/strong><\/h3>\n
                      \n
                    • \n

                      Precision guiding components<\/p>\n<\/li>\n

                    • \n

                      High-stability rotating elements<\/p>\n<\/li>\n<\/ul>\n

                      \n

                      <\/h2>\n

                      Typical Specifications (Customizable)<\/strong><\/h1>\n
                      \n
                      \n\n\n\n\n\n\n\n\n\n\n\n\n
                      Parameter<\/th>\nRange \/ Description<\/th>\n<\/tr>\n<\/thead>\n
                      Material<\/td>\nSynthetic Ruby (Al\u2082O\u2083 + Cr)<\/td>\n<\/tr>\n
                      OD<\/td>\n1\u201350 mm<\/td>\n<\/tr>\n
                      Through-Hole Size<\/td>\n0.2\u201320 mm<\/td>\n<\/tr>\n
                      Thickness<\/td>\n0.2\u201310 mm<\/td>\n<\/tr>\n
                      Tolerance<\/td>\n\u00b10.005\u20130.02 mm<\/td>\n<\/tr>\n
                      Roundness<\/td>\n\u22640.01 mm<\/td>\n<\/tr>\n
                      Surface Finish<\/td>\nPolished \/ Semi-polished<\/td>\n<\/tr>\n
                      Color<\/td>\nRed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
                      \n

                      <\/h2>\n

                      Advantages of Our Ruby Bearings<\/strong><\/h1>\n
                        \n
                      • \n

                        10+ years of jewel bearing manufacturing experience<\/p>\n<\/li>\n

                      • \n

                        Ultra-precision machining and polishing capability<\/p>\n<\/li>\n

                      • \n

                        Clean chamfering and custom geometries supported<\/p>\n<\/li>\n

                      • \n

                        Fast sampling and stable mass production<\/p>\n<\/li>\n

                      • \n

                        100% quality inspection (roundness, flatness, roughness)<\/p>\n<\/li>\n<\/ul>\n

                        \n

                        <\/h2>\n

                        FAQ<\/strong><\/h1>\n

                        Q1: Can you make very small holes such as 0.2\u20130.5 mm?<\/strong><\/h3>\n

                        Yes, micro-holes down to 0.2 mm are available depending on thickness and design.<\/p>\n

                        Q2: Do ruby bearings provide lower friction than metal bearings?<\/strong><\/h3>\n

                        Yes. Ruby offers extremely low friction and does not generate metal particles, making it better for precision and cleanroom environments.<\/p>\n

                        Q3: Can I order special shapes or stepped holes?<\/strong><\/h3>\n

                        Absolutely. We support stepped, tapered, crown-shaped, oval, and custom geometries.<\/p>\n

                        Q4: Are ruby and sapphire interchangeable?<\/strong><\/h3>\n

                        Yes, both are corundum materials. Ruby offers higher visibility and is often preferred in mechanical watches and precision indicators.<\/p>","protected":false},"excerpt":{"rendered":"

                        The\u00a0Ruby Through-Hole Bearing<\/strong>\u00a0is a precision-engineered jewel component made from synthetic ruby (single-crystal Al\u2082O\u2083 with Cr doping). Known for its exceptional hardness, low friction, and excellent dimensional stability, this bearing is widely used in measuring instruments, micro-mechanical assemblies, watches, and high-precision scientific equipment.<\/p>","protected":false},"featured_media":2997,"comment_status":"open","ping_status":"closed","template":"","meta":{"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":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","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":"","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":""}}},"product_brand":[],"product_cat":[68],"product_tag":[],"class_list":{"0":"post-2994","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-sapphire-bearings","7":"desktop-align-left","8":"tablet-align-left","9":"mobile-align-left","10":"ast-product-gallery-layout-horizontal-slider","11":"ast-product-tabs-layout-horizontal","13":"first","14":"instock","15":"shipping-taxable","16":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/product\/2994","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/comments?post=2994"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/media\/2997"}],"wp:attachment":[{"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/media?parent=2994"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/product_brand?post=2994"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/product_cat?post=2994"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/ko\/wp-json\/wp\/v2\/product_tag?post=2994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}