EN 1092-1
European steel flanges, PN designated
The European standard for steel flanges, designated by PN pressure rating (PN2.5 to PN400) and by type numbers such as Type 01 (plate), 05 (blind), 11 (weld neck) and 12 (slip-on hubbed).
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is EN 1092-1?
EN 1092-1 is the European standard for circular steel flanges designated by PN (nominal pressure) rather than ASME class. It covers sizes from DN 10 up to DN 4000 and PN 2.5 to PN 400, numbered flange types (01 plate, 05 blind, 11 weld neck, 12 hubbed slip-on, 13 threaded and others) and facing types (A flat, B raised and more). Material is named separately.
EN 1092-1 at a glance
| Designation | DN size and PN pressure, e.g. DN 100 PN 16 |
|---|---|
| Flange types | 01 plate, 02 loose, 05 blind, 11 weld neck, 12 hubbed slip-on, 13 hubbed threaded, 21 integral |
| Facings | A flat face, B raised face, C/D tongue and groove, E/F spigot and recess, G/H O-ring |
| Material | Named separately (e.g. 1.4404 / 316L forgings) |
EN 1092-1 vs ASME B16.5
| EN 1092-1 | ASME B16.5 | |
|---|---|---|
| Size | DN | NPS |
| Rating | PN 2.5 – PN 400 | Class 150 – 2500 |
| Interchangeable? | No — bolt circles and drilling differ | No |
How to write EN 1092-1 on a purchase order
Name the product, size, material specification and grade, the dimensional standard and the certificate. An example line:
Illustrative only — sizes, tests, inspection level and any project values come from your purchase specification.
EN 1092-1 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition | Not yet confirmed against the publisher listing |
|---|---|
| Full-text verification | In progress — numerical requirements are not published on this page |
| Edition on your order | The edition named in your purchase order or design code governs — confirm it with your enquiry |
What to know before ordering to EN 1092-1
The points that decide whether material to EN 1092-1 is accepted at inspection.
- PN flanges do not bolt to ASME Class flanges; check the bolt circle.
- Facings are designated Type A (flat), B1/B2 (raised) and others.
- Material groups follow EN steel names such as 1.4404 (316L).
Products made to EN 1092-1
How EN 1092-1 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Standards used with EN 1092-1
Same family
EN 1092-1 — questions buyers ask
What is EN 1092-1?
EN 1092-1 is the European standard for circular steel flanges designated by PN (nominal pressure) rather than ASME class. It covers sizes from DN 10 up to DN 4000 and PN 2.5 to PN 400, numbered flange types (01 plate, 05 blind, 11 weld neck, 12 hubbed slip-on, 13 threaded and others) and facing types (A flat, B raised and more). Material is named separately.
Can an EN 1092-1 flange mate with an ASME B16.5 flange?
Generally no — the bolt circles and hole counts differ except in a few coincidental sizes.
What is a Type 11 flange?
A weld neck flange in EN 1092-1 numbering.
Does EN 1092-1 specify the material?
No. EN 1092-1 sets dimensions; the material comes from a separate specification such as ASTM A182, A105 or B564 for flanges, or A403 and B366 for fittings. A complete order names both.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026