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.
Weld Neck: Butt-welded to the pipe with a tapered hub; used for high pressure, high temperature and cyclic service. 100 specifications.
| Size | Rating | Outside Ø D | Thickness C | Raised face D2 | Bolt circle K | Bolting | Hub A | Length H | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| DN10DN10 | 90 | 16 | 40 | 60 | 4 × Ø14 | 28 | 35 | 0.7 kg | Spec sheet | |
| DN15DN15 | 95 | 16 | 45 | 65 | 4 × Ø14 | 32 | 38 | 0.8 kg | Spec sheet | |
| DN20DN20 | 105 | 18 | 58 | 75 | 4 × Ø14 | 40 | 40 | 1.1 kg | Spec sheet | |
| DN25DN25 | 115 | 18 | 68 | 85 | 4 × Ø14 | 46 | 40 | 1.3 kg | Spec sheet | |
| DN32DN32 | 140 | 18 | 78 | 100 | 4 × Ø18 | 56 | 42 | 1.9 kg | Spec sheet | |
| DN40DN40 | 150 | 18 | 88 | 110 | 4 × Ø18 | 64 | 45 | 2.1 kg | Spec sheet | |
| DN50DN50 | 165 | 18 | 102 | 125 | 4 × Ø18 | 74 | 45 | 2.5 kg | Spec sheet | |
| DN65DN65 | 185 | 18 | 122 | 145 | 8 × Ø18 | 92 | 45 | 3 kg | Spec sheet | |
| DN80DN80 | 200 | 20 | 138 | 160 | 8 × Ø18 | 105 | 50 | 3.9 kg | Spec sheet | |
| DN100DN100 | 220 | 20 | 158 | 180 | 8 × Ø18 | 131 | 52 | 4.6 kg | Spec sheet | |
| DN125DN125 | 250 | 22 | 188 | 210 | 8 × Ø18 | 156 | 55 | 6.3 kg | Spec sheet | |
| DN150DN150 | 285 | 22 | 212 | 240 | 8 × Ø22 | 184 | 55 | 7.8 kg | Spec sheet | |
| DN200DN200 | 340 | 24 | 268 | 295 | 12 × Ø22 | 235 | 62 | 11.5 kg | Spec sheet | |
| DN250DN250 | 405 | 26 | 320 | 355 | 12 × Ø26 | 292 | 70 | 16.7 kg | Spec sheet | |
| DN300DN300 | 460 | 28 | 378 | 410 | 12 × Ø26 | 344 | 78 | 22.1 kg | Spec sheet | |
| DN350DN350 | 520 | 30 | 438 | 470 | 16 × Ø26 | 390 | 82 | 32.8 kg | Spec sheet | |
| DN400DN400 | 580 | 32 | 490 | 525 | 16 × Ø30 | 445 | 85 | 41.1 kg | Spec sheet | |
| DN450DN450 | 640 | 34 | 550 | 585 | 20 × Ø30 | — | — | — | Spec sheet | |
| DN500DN500 | 715 | 36 | 610 | 650 | 20 × Ø33 | 548 | 84 | 66.2 kg | Spec sheet | |
| DN600DN600 | 840 | 40 | 725 | 770 | 20 × Ø36 | 670 | 88 | 104 kg | 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.