{"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\/vi\/product\/precision-engineered-through-hole-ruby-bearing-with-extreme-hardness-mohs-9-and-synthetic-single-crystal-ruby-for-minimizing-friction-and-wear\/","title":{"rendered":"V\u00f2ng bi ruby l\u1ed7 xuy\u00ean \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o ch\u00ednh x\u00e1c v\u1edbi \u0111\u1ed9 c\u1ee9ng c\u1ef1c cao (9 \u0111\u1ed9 Mohs) v\u00e0 ruby \u0111\u01a1n tinh th\u1ec3 t\u1ed5ng h\u1ee3p nh\u1eb1m gi\u1ea3m thi\u1ec3u ma s\u00e1t v\u00e0 m\u00e0i m\u00f2n"},"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

            \u1ee8ng d\u1ee5ng<\/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
                      Tham s\u1ed1<\/th>\nRange \/ Description<\/th>\n<\/tr>\n<\/thead>\n
                      Ch\u1ea5t li\u1ec7u<\/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
                      \u0110\u1ed9 d\u00e0y<\/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
                      B\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n<\/td>\nPolished \/ Semi-polished<\/td>\n<\/tr>\n
                      M\u00e0u s\u1eafc<\/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

                        C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/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":["post-2994","product","type-product","status-publish","has-post-thumbnail","product_cat-sapphire-bearings","desktop-align-left","tablet-align-left","mobile-align-left","ast-product-gallery-layout-horizontal-slider","ast-product-tabs-layout-horizontal","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/product\/2994","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/comments?post=2994"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/media\/2997"}],"wp:attachment":[{"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/media?parent=2994"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/product_brand?post=2994"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/product_cat?post=2994"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.sapphiretube.com\/vi\/wp-json\/wp\/v2\/product_tag?post=2994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}