Home > Seamless Tube > Precision Tubes
Cold Drawn Seamless Precision Tubes for High-Pressure & High-Strength Applications
Inox Steel India is a leading manufacturer, exporter, and stockholder of DIN 2391 ST52 Precision Tubes — high-strength seamless tubes widely used in hydraulic systems, automotive components, machinery parts, structural engineering, and heavy-duty mechanical applications. ST52 is a low-alloy, high-strength carbon steel grade known for its superior mechanical properties, excellent weldability, and high fatigue resistance.
Our cold drawn seamless (CDS) ST52 tubes offer:
DIN 2391 ST52 tubes are used where strength + precision + durability are mandatory—especially in components exposed to high stress, dynamic loading, and pressure fluctuations.
Precision tubes must provide: Accurate OD & ID, Fine tolerances for fittings & machining, High tensile/yield strength, Smooth internal surface, and Excellent bending & forming performance. ST52 excels in all these areas due to its optimized carbon-manganese alloy chemistry.
DIN 2391 ST52 precision tubes are engineered for high-pressure, high-load, and precision-machined applications requiring superior strength, toughness, dimensional accuracy, and excellent internal cleanliness. They are the backbone of hydraulic cylinders, automotive systems, machinery parts, and structural components.
🔹 High-Pressure Hydraulic Applications
🔹 Automotive & Mobility Components
🔹 Mechanical & Structural Applications
| Grade | Condition | Price (INR/kg) | Price (USD/kg) | Typical Use |
| ST52 (NBK) | Normalized | ₹120 – ₹170 | $1.50 – $2.20 | Cylinder barrels |
| ST52 (BK) | Cold finished | ₹130 – ₹185 | $1.60 – $2.50 | Precision machining |
| ST52 (BKS) | Stress relieved | ₹140 – ₹195 | $1.75 – $2.65 | Honed tube production |
Final price depends on OD, WT, finish, tolerances, and TPI requirements.
Mechanical Tests
Non-Destructive Tests
Surface & Cleanliness
Dimensional & Certs
Third-Party Inspection Available: SGS, TUV, BV, DNV, Intertek.
Inox Steel India is one of the most trusted suppliers of DIN 2391 ST52 Precision Tubes near Alankar Cinema, Mumbai, delivering high-strength, cold-drawn seamless tubes to hydraulic manufacturers, automotive OEMs, machinery builders, CNC precision workshops, and engineering fabrication units across India and 40+ countries worldwide.
Our ST52 precision tubes are engineered for: High-pressure hydraulic systems, High-strength mechanical parts, CNC-machined components, Fabrication requiring superior weldability, Telescopic & heavy-duty cylinder barrels, and Automotive structural components. With consistent mechanical properties, excellent straightness, precise ID/OD tolerances, and surface finishes, our ST52 tubes are the first choice of engineers.
| Industry | Applications |
| Construction & Earthmoving | Hydraulic cylinders, stabilizers, booms |
| Automotive & Commercial | Drive shafts, axle tubes, chassis components |
| Agricultural Machinery | Lift cylinders, steering tubes |
| Industrial Automation | Hydraulic lines, robotic arms |
| Machine Tool Industry | CNC machining components |
| Mining & Material Handling | Heavy-duty hydraulic tubes |
| Fabrication & Engineering | Precision structural frameworks |
We ensure top-grade packaging to maintain precision, surface quality, and corrosion resistance.
Packaging Includes
Marking & Shipping
Need precision tubes for hydraulic cylinders, CNC machining, or structural engineering? Talk to our technical team today.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in, steel@inoxsteelindia.in
+91 9930796690
Yes — ST52/E355 is the most preferred grade for hydraulic barrels. Yes — available for hydraulic cylinder manufacturers. Yes — ST52 has excellent weldability due to controlled carbon content. Yes — across GCC, Europe, Africa, USA, and South America. What is the difference between NBK, BK, and BKS in DIN 2391?
Are ST52 tubes suitable for hydraulic cylinders?
Do you supply honed or skived tubes?
Can ST52 tubes be welded?
Do you export ST52 tubes?
Inox Steel India supplies DIN 2391 ST52 precision tubes for hydraulic cylinders, automotive components, CNC machining, and mechanical engineering. High-strength seamless cold drawn tubes with NBK/BK/BKS conditions. Exporter to GCC, Europe, Africa & USA.