EN 10305-2 tubing: manufacturer of precision welded cold drawn tubing
EN 10305-2 is the standard for welded tubing with a mirror-finish bore, the one that makes it possible to replace seamless tubing in low-pressure circuits. We are manufacturers of tubing conforming to EN 10305-2 and we deliver it with a certificate in every supply.
What the EN 10305-2 standard is
EN 10305-2 is the European standard that sets the technical delivery conditions for welded cold drawn precision steel tubes (welded cold drawn). It belongs to the EN 10305 series, dedicated entirely to precision tubing, and is the reference when the application demands a quality bore finish and a dimensional accuracy that commercial tubing does not offer: fluid conduction, cylinders, hollow shafts and sliding mechanisms.
Its distinctive feature is the cold drawingprocess, which refines the bore surface and the tolerances of welded tubing to a level that, at low pressure, is equivalent to that of seamless tubing.
What the standard specifies
EN 10305-2 defines, for welded cold drawn tubing, the requirements for:
It is, in short, the standard behind a welded tubing with the smooth, calibrated bore that a fluid circuit or a fine sliding mechanism needs. (We provide the exact tolerance values by diameter in the data sheet, on request.)
Which Delmàs range meets EN 10305-2
It is the reference standard for the PRECISE range (⌀ 8–25 mm), with its mirror-finish bore, and it also underpins the bore behaviour of the OPTIM range in its hybrid configuration, when the part demands simultaneous control of bore and outer diameter.
| Range | Diameter | Role under EN 10305-2 |
|---|---|---|
| PRECISE | ⌀ 8–25 mm | Mirror bore; an alternative to seamless at low pressure. |
| OPTIM | ⌀ 3–10 mm | Simultaneous bore/outer control with a weld bead ≤ 0.15 mm. |
Beyond the standard: we manufacture exactly the tubing you need
EN 10305-2 defines a range of what is possible; your design calls for a specific part. As a manufacturer —not distributors of a closed catalogue— we start from your drawing: if your circuit works with 8.25 mm and not the standard 8.00 mm, we manufacture 8.25 mm, adjusting outer diameter, bore and wall thickness to a hundredth of a millimetre. The standard is the starting point, not the limit: if your specification cites it, we adhere to it; if your design needs to go beyond it, we do.
Market, sectors and applications
A Europeanstandard, applicable across all our EU markets. It is the technical basis of conduction and bore-precision applications:
- Engineering / Hydraulics — low-pressure circuits and oil conduction.
- Automotive — cooling, fluid conduction and gas springs.
- Engineering / Mechanical — hollow shafts and fine sliding guides.
EN 10305-2 versus neighbouring standards
Certification
Every supply conforming to EN 10305-2 is delivered with an EN 10204-2.2 or 3.1certificate, depending on what your quality system requires, with full material traceability.
Why choose Delmàs as your tubing manufacturer
Are you paying the price of seamless tubing in a low-pressure circuit? Send us the specification —diameter, working pressure, fluid. We confirm whether EN 10305-2 is the solution, calculate the saving against seamless and prepare a homologable physical sample.
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We have been manufacturers since 1956. Tell us what you need and our technical team will review your case, with no obligation and no minimum order quantity.
- Technical response in 24 h
- Physical sample to your exact specification
- Cost comparison vs. your current supplier
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