STANDARD · EN-1092-1
EN 1092-1 Flange Dimensions
EN 1092-1:2018 · EN 1092-1
EN 1092-1 is the harmonised European standard for steel pipe flanges, gradually replacing the national DIN 2632/2633/2527 tables. It sizes flanges by DN and rates them by PN, and identifies the flange shape by a type number — type 11 weld neck, type 05 blind, type 12 and 13 slip-on and type 01 plate flange.
For the same DN and PN, EN 1092-1 dimensions are generally compatible with the older DIN tables, but the type, facing and tolerance must still be confirmed. EN flanges are not interchangeable with ASME B16.5 flanges: bolt circles and hole counts differ even where the outside diameter looks the same. The PN6 range starts at DN10 in EN 1092-1, although some 2018 catalogues begin PN6 at DN15.
DIMENSIONS
Dimension tables
One row per specification. Open a size for the drawing, pressure ratings and printable A4 sheet.
Blind: A solid disc bolted over a line end or vessel opening for isolation, testing and future tie-ins. 100 specifications.
| Size | Rating | Outside Ø D | Thickness C | Raised face D2 | Bolt circle K | Bolting | Hub A | Length H | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| DN400DN400 | 540 | 22 | 465 | 495 | 16 × Ø22 | — | — | 38.5 kg | Spec sheet | |
| DN400DN400 | 565 | 26 | 482 | 515 | 16 × Ø26 | — | — | 49.4 kg | Spec sheet | |
| DN400DN400 | 580 | 32 | 490 | 525 | 16 × Ø30 | — | — | 63.5 kg | Spec sheet | |
| DN400DN400 | 620 | 40 | 505 | 550 | 16 × Ø36 | — | — | 89.7 kg | Spec sheet | |
| DN400DN400 | 660 | 50 | 535 | 585 | 16 × Ø39 | — | — | 127 kg | Spec sheet | |
| DN450DN450 | 595 | 24 | 520 | 550 | 16 × Ø22 | — | — | — | Spec sheet | |
| DN450DN450 | 615 | 28 | 532 | 565 | 20 × Ø26 | — | — | 63 kg | Spec sheet | |
| DN450DN450 | 640 | 40 | 550 | 585 | 20 × Ø30 | — | — | — | Spec sheet | |
| DN450DN450 | 670 | 46 | 555 | 600 | 20 × Ø36 | — | — | — | Spec sheet | |
| DN450DN450 | 685 | 57 | 560 | 610 | 20 × Ø39 | — | — | — | Spec sheet | |
| DN500DN500 | 645 | 24 | 570 | 600 | 20 × Ø22 | — | — | 60.1 kg | Spec sheet | |
| DN500DN500 | 670 | 28 | 585 | 620 | 20 × Ø26 | — | — | 75.2 kg | Spec sheet | |
| DN500DN500 | 715 | 44 | 610 | 650 | 20 × Ø33 | — | — | 133 kg | Spec sheet | |
| DN500DN500 | 730 | 51 | 615 | 660 | 20 × Ø36 | — | — | 159 kg | Spec sheet | |
| DN500DN500 | 755 | 57 | 615 | 670 | 20 × Ø42 | — | — | 188 kg | Spec sheet | |
| DN600DN600 | 755 | 30 | 670 | 705 | 20 × Ø26 | — | — | — | Spec sheet | |
| DN600DN600 | 780 | 34 | 685 | 725 | 20 × Ø30 | — | — | 124 kg | Spec sheet | |
| DN600DN600 | 840 | 54 | 725 | 770 | 20 × Ø36 | — | — | 226 kg | Spec sheet | |
| DN600DN600 | 845 | 66 | 720 | 770 | 20 × Ø39 | — | — | 278 kg | Spec sheet | |
| DN600DN600 | 890 | 72 | 735 | 795 | 20 × Ø48 | — | — | — | Spec sheet |
REFERENCE
Pressure ratings, materials and tolerances
Transcribed from EN 1092-1:2018 with table and page references.
EN 1092-1 pressure–temperature ratings
Annex G of EN 1092-1:2018 gives maximum allowable pressures at temperature for a selection of EN flange mater…
Open reference Material groupsEN 1092-1 material groups (1E0 to 16E0)
EN 1092-1 sorts flange steels into material groups rather than individual grades. A group collects materials …
Open reference TolerancesEN 1092-1 flange tolerances (Table 22)
Clause 5.9 of EN 1092-1:2018 refers all flange and collar dimensional tolerances to Table 22, and sends any d…
Open reference MarkingEN 1092-1 flange marking (§5.10)
Clause 5.10 of EN 1092-1:2018 defines what has to appear on a steel flange, lapped end or collar. The full ma…
Open reference Types and facingsEN 1092-1 flange types and facings
EN 1092-1 identifies the shape of a flange or collar with a two-digit type number, from 01 to 37. Table 6 lis…
Open referenceHow to read the pressure class
EN 1092-1 uses PN (nominal pressure) ratings in bar: PN6, PN10, PN16, PN25 and PN40. PN16 means 16 bar nominal at ambient temperature for EN material group 1, derating with temperature per the EN 1092-1 tables. EN PN ratings are not equivalent to ASME classes in dimensions, even where the pressure looks similar.
Edition and verification
Data imported 2026-11-05 08:05.