Size DN400

Back to FLANGE DIMENSIONS TABLE TYPES page

FLANGE DIMENSIONS TABLE SIZE (DN) 400 (16″)

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 23 1/2″ / 597mm 21 1/4″ / 539.8mm 16 1″ 1 1/8″ / 29mm 1 7/16″ / 37mm 1 7/16″ / 37mm
ASME Class 150 B16.42/B16.5 23 1/2″ / 597mm 21 1/4″ / 539.8mm 16 1″ 1 1/8″ / 29mm 36mm 35mm
ASME Class 250 B16.1 25 1/2″ / 648mm 22 1/2″ / 571.5mm 20 1 1/4″ 1 3/8″ / 35mm 57mm
ASME Class 300 B16.42/B16.5 25 1/2″ / 648mm 22 1/2″ / 571.5mm 20 1 1/4″ 1 3/8″ / 35mm 57mm 2 1/4″ / 57mm
ASME Class 600 B16.5 27 1/2″ / 699mm 23 3/4″ / 603.2mm 20 1 1/2″ 1 5/8″ / 41mm 3″ / 76mm
ASME Class 900 B16.5 27 1/2″ / 699mm 23 3/4″ / 603.2mm 20 1 1/2″ 1 5/8″ / 41mm 3″ / 76mm
ASME Class 1500 B16.5 32 1/2″ / 826mm 27 3/4″ / 704.8mm 16 2 1/2″ 2 5/8″ / 67mm 5 3/4″ / 146mm
ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 600mm 540mm 16 M27 29mm 37mm
ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 650mm 571mm 20 M33 35mm 57mm
ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 685mm 603mm 20 M39 42mm 76mm
ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 705mm 616mm 20 M42 45mm 89mm
ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 825mm 705mm 16 M64 68mm 146mm
ISO7005-1/AS4331.1⑤ PN420 (ANSI 2500)
AS2129① Table C 580mm 521mm 12 M24 26mm 32mm 32mm 25mm
AS2129① Table D 580mm 521mm 12 M24 26mm 29mm 25mm 25mm
AS2129① Table E 580mm 521mm 12 M24 26mm 32mm 25mm 25mm
AS2129① Table F 610mm 552mm 20 M27 30mm 35mm 32mm 32mm
AS2129① Table H 610mm 552mm 20 M27 30mm 51mm 44mm 44mm
AS2129① Table J 610mm 552mm 20 M30 33mm 57mm
AS4087① PN14 580mm 521mm 12 M24 26mm 32mm
AS4087① PN16 580mm 521mm 12 M24 26mm 33mm 30mm
AS4087① PN21 610mm 552mm 20 M27 30mm 35mm 38mm
AS4087① PN35 610mm 552mm 20 M27 30mm 51mm 44mm 48mm
BS10 Table D 22 3/4″ / 578mm 20 1/2″ / 521mm 12 7/8″ 1″ / 25mm 1 1/8″ / 29mm 1″ / 25mm 1″ / 25mm
BS10 Table E 22 3/4″ / 578mm 20 1/2″ / 521mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1″ / 25mm 1″ / 25mm
BS10 Table F 24″ / 610mm 21 3/4″ / 552mm 20 1″ 1 1/8″ / 29mm 1 3/8″ / 35mm 1 1/4″ / 32mm 1 1/4″ / 32mm
BS10 Table H 24″ / 610mm 21 3/4″ / 552mm 20 1″ 1 1/8″ / 29mm 2″ / 51mm 1 3/4″ / 44mm 1 3/4″ / 44mm
BS10 Table J 24″ / 610mm 21 3/4″ / 552mm 20 1 1/8″ 1 1/4″ / 32mm 2 1/4″ / 57mm
BS10 Table K 24 3/4″ / 629mm 22 1/4″ / 565mm 20 1 1/4″ 1 3/8″ / 35mm 2 5/8″ / 67mm
ISO7005-1/2/ AS4331.1/.2⑤ PN6 540mm 495mm 16 M20 22mm 28mm 22mm
ISO7005-1/2/ AS4331.1/.2⑤ PN10 565mm 515mm 16 M24 26mm 32mm 24.5mm 26mm
ISO7005-1/2/ AS4331.1/.2⑤ PN16 580mm 525mm 16 M27 30mm 38mm 28mm 32mm
ISO7005-1/2/ AS4331.1/.2⑤ PN25 620mm 550mm 16 M33 36mm 48mm 32mm 40mm
ISO7005-1/2/ AS4331.1/.2⑤ PN40 660mm 585mm 16 M36 39mm 48mm 50mm
BS4504② PN6 540mm 495mm 16 M20 22mm 28mm
BS4504② PN10 565mm 515mm 16 M24 26mm 32mm
BS4504② PN16 580mm 525mm 16 M27 30mm 38mm 32mm
BS4504② PN25 620mm 550mm 16 M33 36mm 48mm 40mm
BS4504② PN40 660mm 585mm 16 M36 39mm 50mm
BS4504② PN64 670mm 585mm 16 M39 42mm 60mm
BS4504② PN100 715mm 620mm 16 M45 48mm 78mm
EN1092-1/2/3③ PN6 540mm 495mm 16 M20 22mm 28mm 22mm
EN1092-1/2/3③ PN10 565mm 515mm 16 M24 26mm 32mm 24.5mm 26mm
EN1092-1/2-/3③ PN16 580mm 525mm 16 M27 30mm 38mm 28mm 32mm
EN1092-1/2/3③ PN25 620mm 550mm 16 M33 36mm 48mm 32mm 40mm
EN1092-1/2/3③ PN40 660mm 585mm 16 M36 39mm 48mm 50mm
EN1092-1/2/3③ PN63 670mm 585mm 16 M39 42mm 60mm
EN1092-1/2/3③ PN100 715mm 620mm 16 M45 48mm 78mm

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.

⑤ 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.

back