| Specification Item | Details |
|---|---|
| Model NO. | JIS EN ASTM DIN GB GOST ISO |
| Type | Seamless or Welded |
| Technique | Cold Drawn or Cold Rolled |
| Material | Carbon and Alloy |
| Surface Treatment | Oiled |
| Usage | Hydraulic/Automobile Pipe, Machinery Industry, Construction, Special Purpose |
| Section Shape | Round |
| IATF16949 | Yes |
| OD | 15-75mm |
| Length | 5-5.8 Meter |
| HS Code | 7304319000 |
| Production Capacity | 50000 Ton/Year |
A precision steel tube is a hollow steel cylinder manufactured with high dimensional accuracy, tight tolerances, and excellent surface quality, typically through processes like cold drawing or cold rolling. These tubes are critical for exact fit and high performance in hydraulic systems, automotive engineering, and aerospace applications.
| Precision Seamless Steel tube | Precision Welded Steel Tube | Precision Shaped Tube |
| ASTM A519 / EN10305-1 / DIN 2391 / GOST 8734 | EN10305-2 / ASTM A513 Type 5 / GOST 10704 | EN10305-5 / ASTM A513 / DIN 2395 |



Precision seamless tubes provide uniform strength and high-pressure resistance. They are essential for hydraulic cylinders and fuel injection systems where reliability under stress is paramount.
Welded precision tubes (DOM) offer minimal eccentricity and tight tolerances (0.015mm - 0.02mm), widely utilized in steering columns and suspension components.
Available in square, rectangular, or oval profiles. These are used in aerospace, medical devices, and chemical processing for their lightweight yet high-strength properties.
| Tube Type / Standard | Wall Thickness | Steel Grade |
|---|---|---|
| Welded: ASTM A513 / EN 10305-2 | 1.5-6mm (0.06-0.23 in) | 1010, 1020, 4130, 4140, E235, E355 |
| Seamless: ASTM A519 / EN10305-1 | 1-14mm (0.039-0.55 in) | 1020, 1040, 1340, 4140, E275, E355 |
| Outer Diameter Range | Standard Tolerance | Special Tolerance |
|---|---|---|
| 4mm - 20mm | ±0.08 mm | ±0.05 mm |
| 20mm - 30mm | ±0.08 mm | ±0.08 mm |
| 31mm - 40mm | ±0.15 mm | ±0.10 mm |
| 41mm - 60mm | ±0.20 mm | ±0.15 mm |
We provide comprehensive one-stop services for subsequent processing, including tube cutting, honing, and precision machining.



