EN 10279 vs EN 10365 for channels and sections
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Why EN 10365 and EN 10279 are complementary on channel orders: nominal dimensions/masses versus tolerances on hot-rolled channels.
EN 10279 and EN 10365 are often listed together on channel enquiries, which can make them look like competing standards.
They are not.
For hot-rolled channels, the two standards answer different questions:
- EN 10365 — what are the nominal dimensions and masses of the standardized section?
- EN 10279 — what tolerances are permitted on the shape, dimensions and mass of hot-rolled channels?
In other words, they are normally complementary, not alternatives.
EN 10365: dimensions and masses
The current EN 10365:2026 covers nominal dimensions and masses for hot-rolled channels, I and H sections.
Its scope includes families such as:
- IPE;
- HE;
- HL/HLZ;
- HD;
- HP/UBP;
- UB and UC;
- UPE/PFC;
- UPN and other channel series listed by the standard.
The standard is therefore a dimensional reference for the nominal section geometry and theoretical mass.
EN 10279: tolerances for channels
EN 10279 specifies tolerances on:
- dimensions;
- shape;
- mass
for hot-rolled steel channels with tapered or parallel flanges.
So if an order is for a standard UPN or UPE channel, the procurement chain can use EN 10365 for nominal geometry and EN 10279 for applicable channel tolerances.
A simple way to remember it
| Question | Standard |
|---|---|
| What is the nominal channel size and mass? | EN 10365 |
| How far may the delivered channel deviate from nominal geometry/mass? | EN 10279 |
This is similar to many steel products where one standard defines the section series and another defines tolerances.
What about I and H beams?
EN 10365 also includes I and H section dimensions and masses.
But EN 10279 is specifically a channel tolerance standard. Do not apply it indiscriminately to IPE, HE, UB or UC profiles simply because those profiles also appear in EN 10365.
The relevant tolerance standard must match the product family.
Important case: laser-welded stainless channels
A supplier description might say something such as:
similar to EN 10365 / EN 10279, laser welded, 1.4404 / 316L
That wording needs careful interpretation.
Both EN 10365 and EN 10279 state that their requirements do not apply to stainless-steel sections/channels in their normal scope, and EN 10279 is written for hot-rolled channels.
A laser-welded stainless channel can be manufactured to similar nominal geometry or even contractually agreed dimensional tolerances, but that does not make it a hot-rolled stainless channel “manufactured to EN 10365/EN 10279.”
The order should separately define:
- stainless material grade and product standard;
- nominal channel geometry;
- agreed tolerances;
- manufacturing route;
- surface finish;
- inspection documentation.
The word “similar to” is doing important work in such a supplier description.
Do not mix material standard and dimensional standard
Another common mistake is to treat the dimensional standard as though it defines the steel grade.
It does not.
The complete order needs separate references for:
- material grade / technical delivery requirements;
- section dimensions;
- tolerances;
- certification.
For the geometry symbols used in section tables, see How to read beam dimensions.
MetalMate takeaway
EN 10365 defines nominal dimensions and masses; EN 10279 defines tolerances for hot-rolled channels. A channel enquiry can legitimately reference both. Neither standard, by itself, defines the material grade.
Related Knowledge
References
- NEN, EN 10365:2026 — Hot rolled steel channels, I and H sections — Dimensions and masses: https://www.nen.nl/en/nen-en-10365-2026-en-353950
- NEN, EN 10279:2000 — Hot rolled steel channels — Tolerances on shape, dimensions and mass: https://www.nen.nl/en/nen-en-10279-2000-en-44420
- ArcelorMittal Orange Book, structural steel product standards overview: https://orangebook.arcelormittal.com/explanatory-notes/long-products/general
Standards referenced
- EN 10279
- EN 10365
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EN 10279 vs EN 10365 for channels and sections
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