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Hydraulic Tubes – DIN 2391 / EN 10305 Manufacturer in India

Cold Drawn · Seamless · Precision Hydraulic Tubing

Inox Steel India is a leading manufacturer, stockist, and exporter of Hydraulic Tubes manufactured in accordance with DIN 2391 and EN 10305 standards. These tubes are engineered for high-pressure hydraulic circuits, hydraulic cylinder manufacturing, heavy-duty machinery, automotive systems, precision assemblies, and load-bearing fluid transfer systems.

Hydraulic tubes operate under demanding conditions involving:

  • High-pressure hydraulic oil
  • Pulsating pressure cycles
  • Vibration & mechanical fatigue
  • Bending, flaring, and forming stress
  • Abrasion and internal cleanliness requirements
  • Precise OD/ID for seamless fittings and connectors

Our cold-drawn precision tubes ensure outstanding dimensional accuracy, smooth bore finish, high tensile strength, and excellent performance in hydraulic and pneumatic systems.

We supply hydraulic tubes in ST35, ST37.4, ST45, ST52, E235, E355 grades, fully compliant with European standards for precision steel tubes used in fluid power systems, automotive hydraulics, and industrial machinery.

Table of Contents

What Are Hydraulic Tubes & Why DIN/EN Standards Are Preferred

Hydraulic tubes must withstand:

  • High working pressure (up to 400–600 bar)
  • Continuous dynamic load
  • Hydraulic oil compatibility
  • Shock loads & cyclic pressure impact
  • Tight OD/ID tolerance for fittings

Hence, the industry prefers DIN 2391 and EN 10305 because these standards guarantee:

  • Precise Dimensional Tolerances: Critical for tube-end forming, flaring, brazing, and compression fittings.
  • High Tensile & Yield Strength: Ensures load-bearing capability in hydraulic cylinders and mobile equipment.
  • Smooth Internal Bore (Low Friction): Improves fluid efficiency and reduces heat & wear inside hydraulic systems.
  • Cold-Drawn Seamless Integrity: No weld seam → no weak points → higher safety at pressure.
  • Excellent Formability: Ideal for Bending, Flaring, Honing, Skiving, and CNC machining.

Overview of Hydraulic Tube Standards

🔹 DIN 2391 – Seamless Precision Hydraulic Tubes (Germany)Common grades:

  • ST35 → Low carbon · high formability
  • ST37.4 → Good weldability · general hydraulic use
  • ST45 → Higher tensile strength
  • ST52 → High-pressure hydraulic cylinders
🔹 EN 10305 – E235 / E355 Precision Steel Tubes (Europe)Types:

  • EN 10305-1 → Cold drawn seamless
  • EN 10305-2 → Welded + cold drawn
  • EN 10305-4 → Seamless precision for hydraulic systems

Manufacturing Process — Precision Hydraulic Tubes

Manufacturing Steps:

  1. Cold Drawing: Achieves tight OD/WT / ID tolerances.
  2. Normalizing / Stress Relieving: Ensures uniform mechanical properties.
  3. Bright Annealing / Phosphating: Enhances corrosion resistance and internal cleanliness.
  4. OD Finishing & Straightening: Perfect straightness for hydraulic assembly.
  5. Inner Surface Cleaning: Essential for hydraulic oil purity.
  6. NDT Testing: Eddy Current & UT test ensure leak-proof tubes.

Why Manufacturers Prefer Our Tubes

  • High fatigue resistance
  • Leak-proof seamless construction
  • Perfect for flaring, brazing, bending
  • High pressure durability (up to 600 bar)
  • Internal cleanliness meets hydraulic oil standards
  • Available in straight tubes + honed tubes

Applications & Technical Specifications of Hydraulic Tubes (DIN 2391 / EN 10305)

Hydraulic Tubes are precision-engineered seamless tubes used for high-pressure hydraulic and pneumatic systems, requiring exceptional dimensional accuracy, high strength, smooth internal bore, and fatigue resistance.

Applications by Standard / Grade / Service Pressure

🔹 DIN 2391 ST35 / ST37.4 (E235)

  • Best for: Medium-pressure hydraulic lines, automotive systems.
  • Applications: Hydraulic & Pneumatic Lines, Fuel Injection Lines, Brake & Steering Lines.
  • Industries: Automotive · Machinery · HVAC · Industrial.
🔹 DIN 2391 ST45 / EN 10305 E355

  • Best for: High-strength systems, mechanical load-bearing.
  • Applications: Hydraulic Cylinder Outer Tubes, Telescopic Cylinder Tubes, High-Pressure Feed Lines.
  • Industries: Construction · Mining · Material Handling · Automation.
🔹 DIN 2391 ST52 / EN 10305 E355

  • Best for: Ultra-high pressure, honing/skiving, cylinder manufacturing.
  • Applications: Honed Cylinder Tubes, Hydraulic Power Packs, Heavy-Duty Mobile Hydraulics.
  • Industries: Earthmoving · Steel Mills · Marine.

Dimensional Range (General)

  • Outside Diameter (OD): 4 mm – 120 mm
  • Wall Thickness (WT): 0.5 mm – 12.5 mm
  • Length: 6M · 12M · Custom
  • Delivery Conditions: NBK (Normalized), BK (Cold Finished), BKS (Stress Relieved), BKW
  • Finishes: Phosphated · Bright · Oiled · Pickled

Indicative Price Range – 2025 (INR + USD)

Grade Condition Price (INR/kg) Price (USD/kg) Applications
ST35 / E235 NBK ₹ 85 – ₹ 135 $1.10 – $1.65 Medium Pressure Lines
ST37.4 BK ₹ 95 – ₹ 150 $1.25 – $1.90 Auto Hydraulics
ST45 / E355 NBK/BK ₹ 110 – ₹ 170 $1.35 – $2.20 High Pressure
ST52 / E355 NBK/BKS ₹ 120 – ₹ 185 $1.50 – $2.50 Cylinder Tubes

Prices vary based on OD, WT, tolerances, finish, and surface condition.

Testing & Quality Assurance

Mechanical Tests

  • Tensile strength
  • Yield strength
  • Hardness test
  • Flattening / Flaring
Non-Destructive Tests

  • Eddy Current (EC)
  • Ultrasonic (UT)
  • Hydrostatic Test
  • Air-under-water leak
Surface & Cleanliness

  • Internal cleanliness
  • Ra measurement (ID)
  • Phosphating verification
Dimensional & Certs

  • OD/WT tolerance
  • Straightness/Ovality
  • EN 10204 3.1 / 3.2

Third-Party Inspection: SGS, TUV, BV, DNV, Intertek.

Engineering Notes (For Hydraulic Designers)

  • Choose ST35 / E235 for medium pressure, high bending/forming requirements, and automotive use.
  • Choose ST45 / E355 when higher pressure + shock load stability is needed.
  • Choose ST52 / E355 for hydraulic cylinders and honed tubes requiring maximum structural strength.
  • Surface Finish: Phosphated & oiled prevents corrosion; Bright finish for precision; Honed ID for cylinders.
  • Delivery Condition: NBK for forming; BK for machining; BKS for dimensional stability.

Hydraulic Tube Supplier Near Alankar Cinema, Mumbai — Inox Steel India

Inox Steel India is a trusted manufacturer and stockist of Hydraulic Tubes near Alankar Cinema, Mumbai, supplying DIN 2391 and EN 10305 precision hydraulic tubes to hydraulic cylinder manufacturers, automotive OEMs, earthmoving equipment makers, power-pack builders, and industrial machinery manufacturers across India and 40+ global destinations.

Our hydraulic tubes are engineered for: High-pressure hydraulic circuits (up to 600 bar), Precision ID & OD tolerances, Bending, flaring, and forming operations, Continuous cyclic pressure loads, Shock load resistance, and Zero leakage performance. We specialize in cold-drawn seamless hydraulic tubes in grades ST35, ST37.4, ST45, ST52, E235, and E355 with delivery conditions NBK, BK, and BKS.

Why Choose Inox Steel India for Hydraulic Tubes?

  1. Precision + Strength: Exact OD/ID tolerance and smooth internal bore for high fluid flow and secure fittings.
  2. Full Range of Grades: ST35 / E235 (Medium), ST45 / E355 (High), and ST52 / E355 (Ultra-high & cylinder grade).
  3. Machining Friendly: Ideal for Honing, Skiving & roller burnishing, Boring, Threading, and Flaring.
  4. OEM & Export Ready: Supplying to earthmoving OEMs, cylinder factories, and Tier-1 suppliers in GCC, Africa, Europe, USA.
  5. Complete Documentation: EN 10204 3.1 / 3.2, NDT Reports (UT, EC), Heat treatment charts, and Hardness results.

Industries & Applications Served

Industry Applications
Construction Equipment Hydraulic cylinders · Booms · Steering pipes
Agriculture Machinery Lift cylinders · Steering tubes
Automotive & Commercial Fuel lines · Brake lines · Hydraulic assist
Industrial Machinery Power packs · Press systems
Mining & Earthmoving Heavy-duty hydraulic tubes
Marine & Offshore Steering hydraulics · Winch cylinders

Packaging & Export Handling

To ensure corrosion protection, dimensional stability, and contamination-free delivery:

Packaging Includes

  • HDPE wrapping and Anti-corrosion oil coating.
  • Phosphated/oiled finish (as ordered).
  • Tube-end rubber/plastic caps and Steel band bundling.
  • Wooden pallets or wooden boxes for export.
Marking & Shipping

  • Marking: DIN 2391 / EN 10305 · Grade · OD × WT · Heat number.
  • Ports: JNPT Mumbai | Mundra Port | Hazira Port.
  • Handling: FCL, LCL, Air shipping for urgent shutdowns.

Get a Quick Hydraulic Tube Quote

For high-pressure hydraulic tubes in DIN 2391 & EN 10305 grades — straight or honed — our technical team is ready to support.

Inox Steel India

52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004

Email

alloy@inoxsteelindia.in, steel@inoxsteelindia.in

Phone

+91 9930796690

Frequently Asked Questions (FAQs)

ST52 / E355 → highest strength + perfect for honing/skiving.

Yes — ST45 / ST52 tubes in NBK/BKS condition handle high-pressure hydraulic circuits.

Yes — fully finished honed/roller-burnished tubes for cylinder barrels.

Yes — phosphated + oiled tubes supplied for automotive & hydraulic use.

Yes — to GCC, Africa, Europe, USA, and South American markets.

Inox Steel India supplies precision hydraulic tubes as per DIN 2391 and EN 10305 standards. ST35, ST45, ST52, E235, E355 seamless tubes for hydraulic cylinders, power packs, and automotive applications. Exporter to GCC, Europe, Africa & USA.

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