Size DN250

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FLANGE DIMENSIONS TABLE SIZE (DN) 250 (10″)

Class/Table Flange O.D. PCD Bolts Bolt Size Hole Size Minimum Flange Thickness*
Cast Iron Copper Alloy Ductile Iron Steel
ASME Class 125 B16.1 16″ / 406mm 14 1/4″ / 362.0mm 12 7/8″ 1″ / 25mm 1 3/16″ / 30mm 1″ / 25mm 1 3/16″ / 30mm
ASME Class 150 B16.24/B16.42/B16.5 16″ / 406mm 14 1/4″ / 362.0mm 12 7/8″ 1″ / 25mm 25.4mm 30mm 28.4mm
ASME Class 250 B16.1 17 1/2″ / 445mm 15 1/4″ / 387.4mm 16 1″ 1 1/8″ / 29mm 48mm
ASME Class 300 B16.5/B16.42 17 1/2″ / 445mm 15 1/4″ / 387.4mm 16 1″ 1 1/8″ / 29mm 48mm 1 7/8″ / 48mm
ASME Class 600 B16.5 20″ / 508mm 17″ / 431.8mm 16 1 1/4″ 1 3/8″ / 35mm 2 1/2″ / 64mm
ASME Class 900 B16.5 21 1/2″ / 546mm 18 1/2″ / 469.9mm 16 1 3/8″ 1 1/2″ / 38mm 2 3/4″ / 70mm
ASME Class 1500 B16.5 23″ / 584mm 19″ / 482.6mm 12 1 7/8″ 2″ / 51mm 4 1/4″ / 108mm
ASME Class 2500 B16.5 26 1/2″ / 673mm 21 1/4″ / 539.8mm 12 2 1/2″ 2 5/8″ / 67mm 6 1/2″ / 165mm
ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 405mm 362mm 12 M24 26mm 30mm
ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 445mm 387mm 16 M27 29mm 48mm
ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 510mm 432mm 16 M33 35mm 63mm
ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 545mm 470mm 16 M36 39mm 70mm
ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 585mm 482mm 12 M48 51mm 108mm
ISO7005-1/AS4331.1⑤ PN420 (ANSI 2500) 675mm 539mm 12 M64 68mm 165mm
AS2129① Table C 405mm 356mm 8 M20 22mm 25mm 25mm 19mm
AS2129① Table D 405mm 356mm 8 M20 22mm 25mm 19mm 19mm
AS2129① Table E 405mm 356mm 12 M20 22mm 25mm 22mm 22mm
AS2129① Table F 430mm 381mm 12 M24 26mm 29mm 25mm 25mm
AS2129① Table H 430mm 381mm 12 M24 26mm 41mm 35mm 35mm
AS2129① Table J 430mm 381mm 12 M27 30mm 48mm
AS4087① PN14 405mm 356mm 8 M20 22mm 25mm
AS4087① PN16 405mm 356mm 8 M20 22mm 24mm
AS4087① PN21 430mm 281mm 12 M24 26mm 32mm
AS4087① PN35 430mm 381mm 12 M24 26mm 41mm 34mm
BS10 Table D 16″ / 406mm 14″ / 356mm 8 3/4″ 7/8″ / 22mm 1″ / 25mm 3/4″ / 19mm 3/4″ / 19mm
BS10 Table E 16″ / 406mm 14″ / 356mm 12 3/4″ 7/8″ / 22mm 1″ / 25mm 7/8″ / 22mm 7/8″ / 22mm
BS10 Table F 17″ / 432mm 15″ / 381mm 12 7/8″ 1″ / 25mm 1 1/8″ / 29mm 1″ / 25mm 1″ / 25mm
BS10 Table H 17″ / 432mm 15″ / 381mm 12 7/8″ 1″ / 25mm 1 5/8″ / 41mm 1 3/8″ / 35mm 1 3/8″ / 35mm
BS10 Table J 17″ / 432mm 15″ / 381mm 12 1″ 1 1/8″ / 29mm 1 7/8″ / 48mm
BS10 Table K 17″ / 432mm 15″ / 381mm 16 1″ 1 1/8″ / 29mm 2″ / 51mm
ISO7005-1/2/ AS4331.1/.2⑤ PN6 375mm 335mm 12 M16 18mm 24mm 22mm
ISO7005-1/2/ AS4331.1/.2⑤ PN10 395mm 350mm 12 M20 22mm 28mm 22mm 26mm
ISO7005-1/2/ AS4331.1/.2⑤ PN16 405mm 355mm 12 M24 26mm 32mm 22mm 26mm
ISO7005-1/2/ AS4331.1/.2⑤ PN25 425mm 370mm 12 M27 30mm 36mm 24.5mm 32mm
ISO7005-1/2/ AS4331.1/.2⑤ PN40 450mm 385mm 12 M30 33mm 34.5mm 38mm
BS4504② PN6 375mm 335mm 12 M16 18mm 24mm
BS4504② PN10 395mm 350mm 12 M20 22mm 28mm
BS4504② PN16 405mm 355mm 12 M24 26mm 32mm 26mm
BS4504② PN25 425mm 370mm 12 M27 30mm 36mm 32mm
BS4504② PN40 450mm 385mm 12 M30 33mm 38mm
BS4504② PN64 470mm 400mm 12 M33 36mm 46mm
BS4504② PN100 505mm 430mm 12 M36 39mm 60mm
EN1092-1/2/3③ PN6 375mm 335mm 12 M16 18mm 24mm 22mm
EN1092-1/2/3③ PN10 395mm 350mm 12 M20 22mm 28mm 22mm 26mm
EN1092-1/2/3③ PN16 405mm 355mm 12 M24 26mm 32mm 22mm 26mm
EN1092-1/2/3③ PN25 425mm 370mm 12 M27 30mm 36mm 24.5mm 32mm
EN1092-1/2/3③ PN40 450mm 385mm 12 M30 33mm 34.5mm 38mm
EN1092-1/2/3③ PN63 470mm 400mm 12 M33 36mm 46mm
EN1092-1/2/3③ PN100 505mm 430mm 12 M36 39mm 60mm

AS2129 still in use but now only covers Table D to H. Table C now obsolete, Table J to T now replaced by AS4331.1 which is a replication of ISO7005-1 which in turn is equivalent to ASME 150-2500 class ANSI B16.5. AS4331.1 and ISO 7005-1 also incorporates previous DIN PN rated flanging. AS4087 is the new standard covering Table D to H. The same drilling is specified but the PN rating system is used (PN14 to PN35) and in some cases flange thickness varies slightly. AS4087 PN14 & PN16 are the same drilling as AS2129 Table D. AS4087 PN21 is the same drilling and rating as AS2129 Table F. AS4087 PN14 & PN16 is the same drilling as AS2129 Table D. AS4087 PN21 is the same rating and drilling as AS2129 Table F and PN35 is the same drilling as Table H. AS4087 specifies raised face in Ductile Iron PN16 & PN35 and flat face in Grey Cast Iron PN14, PN21, PN35. Click here to view full AS4087 flanging dimensions.

② British metric standard BS4504 is now obsolete and replaced by EN1092-1 edition 09-2008 for steel flanges which also incorporates DIN2501 standard. EN1092-1 is also published in the British standards as BS-EN1092-1. Flange drillings in EN1092-1 are generally the same as BS4504 but EN1092-1 covers a wider range.

EN1092-1 is for steel flanges, EN1092-2 is for Iron flanges, EN1092-3 is for Copper Alloy flanges, EN1092-4 is for Aluminium flanges. Regarding EN1092-2 Iron flanges, these figures are for integral flanges on valves, etc. Cast (Grey) Iron thicknesses are shown in Cast Iron column. EN1092-2 specifies a thinner flange thickness for Ductile Iron in larger sizes which is shown in the Ductile Iron column. For full EN1092-1 table Click here EN1092-1 is for steel flanges.

Refer EN1092-3 copper alloy, EN1092-4 aluminium alloy.

ISO7005-1 & ISO7005-2 (which AS4331.1/2 mirrors) replaces DIN 2501 & DIN 2533 and BS4504 PN6 to 40. ISO7005-1 & 7005-2 PN6 to 40 is the same as EN1092-1/2 (note some flanges thicknesses vary slightly) but also incorporates ANSI flanging redesignated as PN20, PN50, PN110, PN150, PN260, PN420. ISO7005-1/AS4331.1 is steel flanges (ISO7005-1 refers to EN1092-1 for steel flange sizes), ISO7005-2/AS4331.2 is iron flanges, ISO7005-3/AS4331.3 is copper alloy flanges. AS4331.1 is a reproduction of ISO7005-1, AS4331.2 is a reproduction of ISO7005-2, AS4331.3 is a reproduction of ISO7005-3. Note where we combine ISO/AS/EN above, some standards do not publish some flange materials, so do not assume CI/DI/Steel/Copper Alloy is published in all three standards. The thicknesses for integral flanges are not the same as for welding & blind flanges. Furthermore ISO7005-1 PN ratings refer to EN 1092-1 which are also published below. EN 1092-2 ratings are generally also aligned with ISO7005-2 which once again are also published below.

* Varies according to flange type (thickness usually includes raised face height where applicable) refer to standard. Some standards publish integral flange thicknesses used for valves which are often different than blind or welding flange thicknesses hence refer to standard for clarification. Refer links to flange standards in the technical screen of our website.

This above table is a rough ready reckoner only to understand standards, differences & commonality and to assess interchangeability. Refer to the standard required itself before manufacture.

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