Guide to DIN Flanges
In the United States, flange standards are set by the American Society of Mechanical Engineers (ASME), American National Standards Institute (ANSI), and American Water Works Association (AWWA) but a variety of international standards also apply to flanges outside the USA. Deutsches Institut für Normung (DIN) is one such system that complies with European and International standards.
About Deutsches Institut für Normung (DIN)
Deutsches Institut für Normung (DIN), or the German Institute for Standardization, is the official body that designates industrial and non-industrial standards for Germany. DIN is also the national standards body that determines the German edition of European and International Organization for Standardization (ISO) standards. Compatible parts and components are imperative to proper function and safety, and relying on a set of standards like DIN ensures consistency between manufacturers and suppliers.
What Is a DIN Flange?
DIN sets industry standards for quality assurance and safety, including flange materials requirements and pressure and temperature rating. While DIN flanges are less common in the United States, imported systems and equipment or international maritime vessels may require these metric pipe flanges and parts. Because compatible piping system components are important for proper function, flange distributors like API International, Inc. often stock flanges manufactured to Deutsches Institut für Normung specifications.
Dimensions of DIN Flanges
| **Nominal BSP Pipe Size | PN6 | PN10 | PN16 | PN25 | PN40 | |
|---|---|---|---|---|---|---|
| DN 10 | 75 | 90 | 90 | 90 | 90 | O.D. |
| 3/8″ | 50 | 60 | 60 | 60 | 60 | PCD (bolt circle) |
| 4 x 11 | 4 x 14 | 4 x 14 | 4 x 14 | 4 x 14 | # of holes x diam. of holes | |
| DN 15 | 80 | 95 | 95 | 95 | 95 | O.D. |
| 1/2″ | 55 | 65 | 65 | 65 | 65 | PCD (bolt circle) |
| 4 x 11 | 4 x 14 | 4 x 14 | 4 x 14 | 4 x 14 | # of holes x diam. of holes | |
| DN 20 | 90 | 105 | 105 | 105 | 105 | O.D. |
| 3/4″ | 65 | 75 | 75 | 75 | 75 | PCD (bolt circle) |
| 4 x 11 | 4 x 14 | 4 x 14 | 4 x 14 | 4 x 14 | # of holes x diam. of holes | |
| DN 25 | 100 | 115 | 115 | 115 | 115 | O.D. |
| 1″ | 75 | 85 | 85 | 85 | 85 | PCD (bolt circle) |
| 4 x 11 | 4 x 14 | 4 x 14 | 4 x 14 | 4 x 14 | # of holes x diam. of holes | |
| DN 32 | 120 | 140 | 140 | 140 | 140 | O.D. |
| 1 1/4″ | 90 | 100 | 100 | 100 | 100 | PCD (bolt circle) |
| 4 x 14 | 4 x 18 | 4 x 18 | 4 x 18 | 4 x 18 | # of holes x diam. of holes | |
| DN 40 | 130 | 150 | 150 | 150 | 150 | O.D. |
| 1 1/2″ | 100 | 110 | 110 | 110 | 110 | PCD (bolt circle) |
| 4 x 14 | 4 x 18 | 4 x 18 | 4 x 18 | 4 x 18 | # of holes x diam. of holes | |
| DN 50 | 140 | 165 | 165 | 165 | 165 | O.D. |
| 2″ | 110 | 125 | 125 | 125 | 125 | PCD (bolt circle) |
| 4 x 14 | 4 x 18 | 4 x 18 | 4 x 18 | 4 x 18 | # of holes x diam. of holes | |
| DN 65 | 160 | 185 | 185 | 185 | 185 | O.D. |
| 2 1/2″ | 130 | 145 | 145 | 145 | 145 | PCD (bolt circle) |
| 4 x 14 | 4 x 18 | 4 x 18 | 8 x 18 | 8 x 18 | # of holes x diam. of holes | |
| DN 80 | 190 | 200 | 200 | 200 | 200 | O.D. |
| 3″ | 150 | 160 | 160 | 160 | 160 | PCD (bolt circle) |
| 4 x 18 | 8 x 18 | 8 x 18 | 8 x 18 | 8 x 18 | # of holes x diam. of holes | |
| DN 100 | 210 | 220 | 220 | 235 | 235 | O.D. |
| 4″ | 170 | 180 | 180 | 190 | 190 | PCD (bolt circle) |
| 4 x 18 | 8 x 18 | 8 x 18 | 8 x 22 | 8 x 22 | # of holes x diam. of holes | |
| DN 125 | 240 | 250 | 250 | 270 | 270 | O.D. |
| 5″ | 200 | 210 | 210 | 220 | 220 | PCD (bolt circle) |
| 8 x 18 | 8 x 18 | 8 x 18 | 8 x 26 | 8 x 26 | # of holes x diam. of holes | |
| DN 150 | 265 | 285 | 285 | 300 | 300 | O.D. |
| 6″ | 225 | 240 | 240 | 250 | 250 | PCD (bolt circle) |
| 8 x 18 | 8 x 22 | 8 x 22 | 8 x 26 | 8 x 26 | # of holes x diam. of holes | |
| DN 175 | 315 | 315 | 330 | 350 | O.D. | |
| 7″ | 270 | 270 | 280 | 295 | PCD (bolt circle) | |
| 8 x 22 | 8 x 22 | 12 x 26 | 12 x 30 | # of holes x diam. of holes | ||
| DN 200 | 320 | 340 | 340 | 360 | 375 | O.D. |
| 8″ | 280 | 295 | 295 | 310 | 320 | PCD (bolt circle) |
| 8 x 18 | 8 x 22 | 12 x 22 | 12 x 26 | 12 x 30 | # of holes x diam. of holes | |
| DN 250 | 375 | 395 | 405 | 425 | 450 | O.D. |
| 10″ | 335 | 350 | 355 | 370 | 385 | PCD (bolt circle) |
| 12 x 18 | 12 x 22 | 12 x 26 | 12 x 30 | 12 x 33 | # of holes x diam. of holes | |
| DN 300 | 440 | 445 | 460 | 485 | 515 | O.D. |
| 12″ | 395 | 400 | 410 | 430 | 450 | PCD (bolt circle) |
| 12 x 22 | 12 x 22 | 12 x 26 | 16 x 30 | 16 x 33 | # of holes x diam. of holes | |
| DN 350 | 490 | 505 | 520 | 555 | 580 | O.D. |
| 14″ | 445 | 460 | 470 | 490 | 510 | PCD (bolt circle) |
| 12 x 22 | 16 x 22 | 16 x 26 | 16 x 33 | 16 x 36 | # of holes x diam. of holes | |
| DN 400 | 540 | 565 | 580 | 620 | 660 | O.D. |
| 16″ | 495 | 515 | 525 | 550 | 585 | PCD (bolt circle) |
| 16 x 22 | 16 x 26 | 16 x 30 | 16 x 36 | 16 x 39 | # of holes x diam. of holes | |
| DN 500 | 645 | 670 | 715 | 730 | 755 | O.D. |
| 20″ | 600 | 620 | 650 | 660 | 670 | PCD (bolt circle) |
| 20 x 22 | 20 x 26 | 20 x 33 | 20 x 36 | 20 x 42 | # of holes x diam. of holes | |
| DN 600 | 755 | 780 | 840 | 845 | O.D. | |
| 24″ | 705 | 725 | 770 | 770 | PCD (bolt circle) | |
| 20 x 24 | 20 x 27 | 20 x 33 | 20 x 36 | # of holes x diam. of holes |
PN 6 Flanges DIN EN 1092-1
Dimensions of PN 6 Flanges DIN EN 1092-1
NOTE 1: Dimensions N1, N2, and N3 are measured at the intersection of the hub draft angle and the back face of the flange.
NOTE 2: For d1 dimensions see document “Flange facing according to DIN EN 1092-1”.
Dimensions in mm
* Above DN 600 dimension C1 is to be specified by the purchaser.
** For flanges type 21 the outside hub diameter approximately corresponds to the outside pipe diameter.
What’s the Difference Between DIN, ASME, and ANSI Flanges
While America’s most common standards for flanges and fittings are AWWA, ANSI, and ASME, European and international industries rely on DIN standards, which use the metric system. DIN flanges are available in the same flange styles as ASME/ANSI flanges, such as slip-on, weld-neck, and blind flanges. Similar measurements are taken to determine the appropriate flange size—including outer and inner diameter, the number of bolt holes, and bolt hole and bolt circle diameter. However, for DIN flanges these dimensions and the pressure ratings are different than those on an AWWA, ANSI or ASME flange. For this reason, DIN flanges should be paired with piping system components that comply with the same standard.
Are DIN and ANSI Flanges Compatible?
DIN flanges are not interchangeable with ANSI- or ASME-rated flanges or piping systems because mismatched flanges cannot be mated. There is no exact DIN-to-ANSI flange conversion—even if the bolt holes align, there may be a disparity between pressure ratings or other aspects of the standards. While adapters can be custom machined to facilitate matching European standard and American standard piping components, using the appropriate DIN components is a quicker, easier option.
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