{"id":2183,"date":"2026-04-12T22:26:14","date_gmt":"2026-04-12T14:26:14","guid":{"rendered":"https:\/\/www.gsnewmaterial.com\/?p=2183"},"modified":"2026-04-23T18:02:50","modified_gmt":"2026-04-23T10:02:50","slug":"precision-honed-tube-mirror-surface-high-precision-hydraulic-tube","status":"publish","type":"post","link":"https:\/\/www.gsnewmaterial.com\/ar\/precision-honed-tube-mirror-surface-high-precision-hydraulic-tube.html","title":{"rendered":"Precision Honed Tube | Mirror Surface High-Precision Hydraulic Tube"},"content":{"rendered":"
\n

Product Description<\/h3>\n

What is a Precision Honed Tube?<\/h4>\n

A\u00a0Precision Honed Tube<\/strong>\u00a0is a high-end seamless steel tube manufactured through a specialized process combining:<\/p>\n

    \n
  1. \n

    Cold Drawing or Cold Rolling<\/strong>\u00a0\u2013 for precise outer diameter and improved mechanical properties<\/p>\n<\/li>\n

  2. \n

    Multi-stage Internal Honing<\/strong>\u00a0\u2013 using fixed abrasive stones to achieve exceptional inner surface finish and dimensional accuracy<\/p>\n<\/li>\n

  3. \n

    Stress Relieving<\/strong>\u00a0\u2013 to eliminate residual stresses from cold working<\/p>\n<\/li>\n<\/ol>\n

    The result is a tube with\u00a0extremely tight tolerances (H7\/H8)<\/strong>\u00a0and a\u00a0mirror-like inner surface (Ra \u2264 0.3\u03bcm)<\/strong>\u00a0, making it the preferred raw material for\u00a0precision hydraulic cylinders, servo cylinders, and high-performance pneumatic systems<\/strong>.<\/p>\n

    \"\"<\/div>\n

    Compared with standard honed tubes, precision honed tubes have stricter tolerance control and are widely used in servo hydraulic systems, precision machinery, medical equipment, and new energy equipment.<\/p>\n<\/div>\n

    Key Specifications<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    Product Name<\/strong><\/td>\nPrecision Honed Tube<\/td>\n<\/tr>\n
    Model<\/strong><\/td>\n[PHT-XXXX-XX]<\/td>\n<\/tr>\n
    Material<\/strong><\/td>\n[ST52 \/ E355 \/ CK45 \/ 45# \/ 20# \/ SAE 1020 \/ SAE 4140]<\/td>\n<\/tr>\n
    Outer Diameter (OD)<\/strong><\/td>\n[e.g., 40 \u2013 160 mm]<\/td>\n<\/tr>\n
    Inner Diameter (ID)<\/strong><\/td>\n[e.g., 30 \u2013 140 mm]<\/td>\n<\/tr>\n
    Wall Thickness<\/strong><\/td>\n[e.g., 5 \u2013 18 mm]<\/td>\n<\/tr>\n
    Tolerance Grade<\/strong><\/td>\nH7 (ultra precision) \/ H8 (high precision – standard) \/ H9 (commercial precision)<\/td>\n<\/tr>\n
    Surface Roughness (Ra)<\/strong><\/td>\n\u2264 0.3 \u03bcm for H7 \/ \u2264 0.4 \u03bcm for H8 \/ \u2264 0.8 \u03bcm for H9<\/td>\n<\/tr>\n
    Roundness Tolerance<\/strong><\/td>\n\u2264 40% of ID tolerance<\/td>\n<\/tr>\n
    Straightness<\/strong><\/td>\n\u2264 0.3 mm per meter (H7) \/ \u2264 0.5 mm per meter (H8\/H9)<\/td>\n<\/tr>\n
    Length<\/strong><\/td>\n6 meters (standard) \/ 3 \u2013 12 meters (customized)<\/td>\n<\/tr>\n
    Delivery Condition<\/strong><\/td>\nBK+S (stress relieved) \/ NBK (normalized) \/ GBK (annealed)<\/td>\n<\/tr>\n
    End Finish<\/strong><\/td>\nPlastic caps + anti-rust oil<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    \n

    Why Choose Precision Honed Tubes?<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
    Advantage<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
    Ultra-tight Dimensional Accuracy<\/strong><\/td>\nH7\/H8 tolerance ensures perfect piston-to-barrel fit, minimizing internal leakage<\/td>\n<\/tr>\n
    Superior Surface Finish<\/strong><\/td>\nRa \u2264 0.3\u03bcm dramatically reduces seal wear and friction<\/td>\n<\/tr>\n
    Extended Cylinder Life<\/strong><\/td>\nSmooth surface prevents micro-leaks and reduces maintenance frequency<\/td>\n<\/tr>\n
    Consistent Quality<\/strong><\/td>\nBatch-to-batch consistency guaranteed through statistical process control<\/td>\n<\/tr>\n
    Excellent Straightness<\/strong><\/td>\n\u2264 0.3mm\/m ensures smooth piston travel without binding<\/td>\n<\/tr>\n
    Full Traceability<\/strong><\/td>\nEach tube marked with heat number; EN 10204 3.1 certificate provided<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n

    Tolerance Grade Comparison<\/h3>\n
    \n
    \n
    <\/div>\n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n
    Grade<\/th>\nID Tolerance (\u03bcm)<\/th>\nRa (\u03bcm)<\/th>\nTypical Application<\/th>\nPrice Level<\/th>\n<\/tr>\n<\/thead>\n
    H7<\/strong><\/td>\n\u2264 25 \u2013 35<\/td>\n\u2264 0.3<\/td>\nServo cylinders, aerospace, precision machine tools<\/td>\nHigh<\/td>\n<\/tr>\n
    H8<\/strong><\/td>\n\u2264 40 \u2013 60<\/td>\n\u2264 0.4<\/td>\nGeneral hydraulic cylinders, industrial machinery<\/td>\nMedium<\/td>\n<\/tr>\n
    H9<\/strong><\/td>\n\u2264 60 \u2013 100<\/td>\n\u2264 0.8<\/td>\nAgricultural equipment, low-speed cylinders<\/td>\nEconomic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n

    Note: Tolerance values vary slightly with diameter. Contact us for specific tolerance charts.<\/em><\/p>\n<\/blockquote>\n

    \n

    Available Materials & Standards<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
    Material Grade<\/th>\nStandard<\/th>\nKey Properties<\/th>\nTypical Application<\/th>\n<\/tr>\n<\/thead>\n
    ST52 \/ E355<\/strong><\/td>\nDIN 2391 \/ EN 10305-1<\/td>\nHigh strength, good weldability<\/td>\nMost popular for precision cylinders<\/td>\n<\/tr>\n
    CK45 \/ 45#<\/strong><\/td>\nDIN 2391 \/ GB\/T 8713<\/td>\nMedium carbon, wear resistant<\/td>\nHeavy-duty industrial cylinders<\/td>\n<\/tr>\n
    20# \/ SAE 1020<\/strong><\/td>\nGB\/T 8162 \/ ASTM A519<\/td>\nLow carbon, excellent formability<\/td>\nFormed end cylinders, welded assemblies<\/td>\n<\/tr>\n
    SAE 4140<\/strong><\/td>\nASTM A519<\/td>\nChromium-molybdenum alloy, high strength<\/td>\nHigh-pressure, heavy-load applications<\/td>\n<\/tr>\n
    27SiMn<\/strong><\/td>\nGB\/T 17396<\/td>\nManganese-silicon alloy<\/td>\nMining and construction equipment<\/td>\n<\/tr>\n
    E355<\/strong><\/td>\nEN 10305-1<\/td>\nFine grain steel, superior toughness<\/td>\nDynamic load cylinders<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n

    Standard Size Range<\/h3>\n

    Below is our common size range for precision honed tubes. Custom sizes available upon request.<\/em><\/p>\n

    \n
    \n
    <\/div>\n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    ID (mm)<\/th>\nOD (mm)<\/th>\nWall Thickness (mm)<\/th>\nTypical Tolerance<\/th>\n<\/tr>\n<\/thead>\n
    30<\/td>\n38 \u2013 45<\/td>\n4.0 \u2013 7.5<\/td>\nH8 \/ H7<\/td>\n<\/tr>\n
    40<\/td>\n50 \u2013 55<\/td>\n5.0 \u2013 7.5<\/td>\nH8 \/ H7<\/td>\n<\/tr>\n
    50<\/td>\n60 \u2013 65<\/td>\n5.0 \u2013 7.5<\/td>\nH8 \/ H7<\/td>\n<\/tr>\n
    63<\/td>\n73 \u2013 80<\/td>\n5.0 \u2013 8.5<\/td>\nH8 \/ H7<\/td>\n<\/tr>\n
    80<\/td>\n90 \u2013 100<\/td>\n5.0 \u2013 10.0<\/td>\nH8 \/ H7<\/td>\n<\/tr>\n
    100<\/td>\n115 \u2013 125<\/td>\n7.5 \u2013 12.5<\/td>\nH8<\/td>\n<\/tr>\n
    125<\/td>\n140 \u2013 152<\/td>\n7.5 \u2013 13.5<\/td>\nH8<\/td>\n<\/tr>\n
    140<\/td>\n156 \u2013 168<\/td>\n8.0 \u2013 14.0<\/td>\nH8<\/td>\n<\/tr>\n
    160<\/td>\n180 \u2013 190<\/td>\n10.0 \u2013 15.0<\/td>\nH8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n

    Custom Sizes<\/strong>: ID from 20mm to 400mm, any OD\/WT combination. H7 tolerance available for most sizes.<\/p>\n<\/blockquote>\n

    Technical Features<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Feature<\/th>\nValue \/ Description<\/th>\n<\/tr>\n<\/thead>\n
    Honing method<\/strong><\/td>\nFixed multi-stone honing head with automatic sizing<\/td>\n<\/tr>\n
    Surface roughness achievable<\/strong><\/td>\nRa 0.2\u03bcm \u2013 0.8\u03bcm (H7 achievable: Ra \u2264 0.3\u03bcm)<\/td>\n<\/tr>\n
    ID tolerance capability<\/strong><\/td>\nH7, H8, H9 (ISO 286-2)<\/td>\n<\/tr>\n
    Roundness deviation<\/strong><\/td>\n\u2264 50% of ID tolerance (H7: \u2264 40%)<\/td>\n<\/tr>\n
    Cylindricity<\/strong><\/td>\n\u2264 50% of ID tolerance per 300mm length<\/td>\n<\/tr>\n
    Hardness (BK+S)<\/strong><\/td>\n180 \u2013 240 HB (depending on material)<\/td>\n<\/tr>\n
    Microstructure<\/strong><\/td>\nFine pearlite + ferrite, stress relieved<\/td>\n<\/tr>\n
    Maximum working pressure<\/strong><\/td>\nUp to 500 bar (depending on wall thickness and material)<\/td>\n<\/tr>\n
    Chrome plating ready<\/strong><\/td>\nYes \u2013 honed surface ideal for hard chrome plating<\/td>\n<\/tr>\n
    Seal compatibility<\/strong><\/td>\nCompatible with all standard hydraulic seals (NBR, FKM, PTFE, PU)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n

    Quality Assurance<\/h3>\n

    Dimensional Inspection<\/h3>\n
      \n
    • \n

      ID measurement<\/strong>: Air gauge or electronic plug gauge (accuracy \u00b10.001mm)<\/p>\n<\/li>\n

    • \n

      OD measurement<\/strong>: Laser micrometer<\/p>\n<\/li>\n

    • \n

      Roundness<\/strong>: Roundness tester<\/p>\n<\/li>\n

    • \n

      Surface roughness<\/strong>: Profilometer (Ra, Rz, Rmax)<\/p>\n<\/li>\n<\/ul>\n

      Non-Destructive Testing (NDT)<\/h3>\n
        \n
      • \n

        Eddy current testing<\/strong>\u00a0(ECT) available<\/p>\n<\/li>\n

      • \n

        Ultrasonic testing<\/strong>\u00a0(UT) available upon request<\/p>\n<\/li>\n

      • \n

        Hydrostatic testing<\/strong>\u00a0available<\/p>\n<\/li>\n<\/ul>\n

        Documentation Provided<\/h3>\n
          \n
        • \n

          \u2705\u00a0EN 10204 3.1<\/strong>\u00a0\u2013 Material certificate with batch traceability<\/p>\n<\/li>\n

        • \n

          \u2705\u00a0COA (Certificate of Analysis)<\/strong>\u00a0\u2013 Chemical composition + mechanical properties<\/p>\n<\/li>\n

        • \n

          \u2705\u00a0Inspection Report<\/strong>\u00a0\u2013 ID, tolerance, roundness, straightness, surface roughness<\/p>\n<\/li>\n

        • \n

          \u2705\u00a0Mill Test Certificate<\/strong>\u00a0(MTC)<\/p>\n<\/li>\n<\/ul>\n

          Certifications<\/h3>\n
            \n
          • \n

            \u2705\u00a0ISO 9001:2015<\/strong>\u00a0\u2013 Quality management system<\/p>\n<\/li>\n

          • \n

            \u2705\u00a0IATF 16949<\/strong>\u00a0(upon request) \u2013 Automotive grade<\/p>\n<\/li>\n

          • \n

            \u2705\u00a0Third-party inspection<\/strong>\u00a0(SGS \/ BV \/ TUV) available<\/p>\n<\/li>\n<\/ul>\n

            \n

            Packing & Delivery<\/h3>\n
            \n
            \n
            <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
            Packing Method<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
            Surface protection<\/strong><\/td>\nAnti-rust oil (inside + outside) + VCI paper<\/td>\n<\/tr>\n
            End protection<\/strong><\/td>\nHeavy-duty plastic caps on both ends<\/td>\n<\/tr>\n
            Interleaving<\/strong><\/td>\nKraft paper between layers<\/td>\n<\/tr>\n
            Bundling<\/strong><\/td>\nSteel straps, 500 \u2013 1500 kg per bundle<\/td>\n<\/tr>\n
            Outer packing<\/strong><\/td>\nWaterproof woven fabric + plywood crates (for H7 premium products)<\/td>\n<\/tr>\n
            Container loading<\/strong><\/td>\n20ft GP \/ 40ft HC \u2013 loading plan provided<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

            Delivery Time<\/strong>:<\/p>\n

              \n
            • \n

              Stock sizes: 7 \u2013 15 days<\/p>\n<\/li>\n

            • \n

              Custom sizes (H8): 20 \u2013 30 days<\/p>\n<\/li>\n

            • \n

              Custom sizes (H7): 25 \u2013 40 days<\/p>\n<\/li>\n<\/ul>\n

              Incoterms<\/strong>: EXW, FOB, CIF, CFR, DDP \u2013 flexible<\/p>\n

              \n

              Why Choose Our Precision Honed Tubes<\/h3>\n
              \n
              \n
              <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n
              Reason<\/th>\nDetail<\/th>\n<\/tr>\n<\/thead>\n
              Dedicated honing workshop<\/strong><\/td>\n15+ honing machines, capacity 3000 tons\/year<\/td>\n<\/tr>\n
              Strict tolerance control<\/strong><\/td>\nCpk \u2265 1.33 for all H7\/H8 dimensions<\/td>\n<\/tr>\n
              100% inspection<\/strong><\/td>\nEvery tube inspected before shipment<\/td>\n<\/tr>\n
              Short lead time<\/strong><\/td>\nLarge stock of cold drawn blanks<\/td>\n<\/tr>\n
              Competitive pricing<\/strong><\/td>\nFactory direct \u2013 no middleman markup<\/td>\n<\/tr>\n
              Technical support<\/strong><\/td>\nEngineering team advises on tolerance selection<\/td>\n<\/tr>\n
              Global export experience<\/strong><\/td>\nShipped to 30+ countries<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
              \n

              Typical Applications<\/h3>\n
              \n
              \n
              <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n\n\n
              Industry<\/th>\nApplication<\/th>\nRecommended Grade\/Tolerance<\/th>\n<\/tr>\n<\/thead>\n
              Machine Tools<\/strong><\/td>\nHydraulic cylinders for presses, injection molding machines<\/td>\nH7, ST52<\/td>\n<\/tr>\n
              Material Handling<\/strong><\/td>\nForklift mast cylinders, scissor lifts<\/td>\nH8, ST52\/E355<\/td>\n<\/tr>\n
              Construction Equipment<\/strong><\/td>\nExcavator, loader, bulldozer cylinders<\/td>\nH8, 27SiMn\/ST52<\/td>\n<\/tr>\n
              Agricultural Machinery<\/strong><\/td>\nTractor 3-point hitch cylinders<\/td>\nH9, 45#\/ST52<\/td>\n<\/tr>\n
              Automotive<\/strong><\/td>\nTilt cylinders, suspension components<\/td>\nH8, SAE 1020<\/td>\n<\/tr>\n
              Aerospace<\/strong><\/td>\nLanding gear, flight control actuators<\/td>\nH7, 4140\/E355<\/td>\n<\/tr>\n
              Marine<\/strong><\/td>\nSteering cylinders, hatch covers<\/td>\nH8, SS316\/Duplex (stainless)<\/td>\n<\/tr>\n
              Industrial Automation<\/strong><\/td>\nPneumatic cylinders, servo actuators<\/td>\nH7, ST52<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
              \n

              Technical Data Sheet (Reference)<\/h3>\n

              *For ST52 \/ E355 material, H8 tolerance, BK+S condition:*<\/p>\n

              \n
              \n
              <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
              ID (mm)<\/th>\nID Tolerance H8 (\u03bcm)<\/th>\nRa (\u03bcm)<\/th>\nRoundness (\u03bcm)<\/th>\nStraightness (mm\/m)<\/th>\n<\/tr>\n<\/thead>\n
              40<\/td>\n+39 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 20<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n
              50<\/td>\n+39 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 20<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n
              63<\/td>\n+46 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 23<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n
              80<\/td>\n+46 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 23<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n
              100<\/td>\n+54 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 27<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n
              125<\/td>\n+54 \/ 0<\/td>\n\u2264 0.4<\/td>\n\u2264 27<\/td>\n\u2264 0.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
              \n

              Full technical data sheet available upon request.<\/em><\/p>\n<\/blockquote>\n

              <\/div>\n
              Application Cases<\/strong><\/div>\n
              <\/div>\n
                \n
              • Servo Hydraulic Actuators<\/strong>: Used in industrial robots and automated production lines, high positioning accuracy and fast response.<\/li>\n
              • CNC Machine Tools<\/strong>: Applied in spindle sleeves and guide sleeves, ensuring stable operation and high machining accuracy.<\/li>\n
              • Medical Equipment<\/strong>: Used in operating tables and diagnostic equipment, quiet, smooth, and jitter-free.<\/li>\n
              • New Energy Lithium Battery Equipment<\/strong>: Precision cylinders for electrode slicers and filling machines, wear-resistant and pollution-free.<\/li>\n
              • Airport Ground Support Equipment<\/strong>: Used in boarding bridges and aircraft maintenance lifts, high reliability and long service life.<\/li>\n<\/ul>\n
                \"\"<\/div>\n
                Our precision honed tubes comply with GB\/T 3639 and DIN 2391 standards. Each tube is inspected for size, roughness, straightness, and pressure testing. Customization based on drawings is available.<\/div>","protected":false},"excerpt":{"rendered":"

                Product Description What is a Precision Honed Tube? A\u00a0Precision Honed Tube\u00a0is a high-end seamless steel tube manufactured through a specialized process combining: Cold Drawing or Cold Rolling\u00a0\u2013 for precise outer diameter and improved mechanical properties Multi-stage Internal Honing\u00a0\u2013 using fixed abrasive stones to achieve exceptional inner surface finish and dimensional accuracy Stress Relieving\u00a0\u2013 to eliminate […]<\/p>","protected":false},"author":2,"featured_media":2193,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26,7],"tags":[],"class_list":["post-2183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-precision-honed-tubes","category-product-center"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/posts\/2183","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/comments?post=2183"}],"version-history":[{"count":5,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/posts\/2183\/revisions"}],"predecessor-version":[{"id":2339,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/posts\/2183\/revisions\/2339"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/media\/2193"}],"wp:attachment":[{"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/media?parent=2183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/categories?post=2183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gsnewmaterial.com\/ar\/wp-json\/wp\/v2\/tags?post=2183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}