Size DN300

Back to FLANGE DIMENSIONS TABLE TYPES page

FLANGE DIMENSIONS TABLE SIZE (DN) 300 (12″)

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 19″ / 483mm 17″ / 431.8mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1 1/16″ / 27mm 1 1/4″ / 32mm
ASME Class 150 B16.24/B16.42/B16.5 19″ / 483mm 17″ / 431.8mm 12 7/8″ 1″ / 25mm 26.9mm 32mm 30.2mm
ASME Class 250 B16.1 20 1/2″ / 521mm 17 3/4″ / 450.8mm 16 1 1/8″ 1 1/4″ / 32mm 51mm
ASME Class 300 B16.5/B16.42 20 1/2″ / 521mm 17 3/4″ / 450.8mm 16 1 1/8″ 1 1/4″ / 32mm 51mm 2″ / 51mm
ASME Class 600 B16.5 22″ / 559mm 19 1/4″ / 489.0mm 20 1 1/4″ 1 3/8″ / 35mm 2 5/8″ / 67mm
ASME Class 900 B16.5 24″ / 610mm 21″ / 533.4mm 20 1 3/8″ 1 1/2″ / 38mm 3 1/8″ / 79mm
ASME Class 1500 B16.5 26 1/2″ / 673mm 22 1/2″ / 571.5mm 16 2″ 2 1/8″ / 54mm 4 7/8″ / 124mm
ASME Class 2500 B16.5 30″ / 762.1mm 24 3/8″ / 619.1mm 12 2 3/4″ 2 7/8″ / 73mm 7 1/4″ / 184mm
ISO7005-1/AS4331.1 ⑤ PN20 (ANSI 150) 485mm 432mm 12 M24 26mm 32mm
ISO7005-1/AS4331.1 ⑤ PN50 (ANSI 300) 520mm 451mm 16 M30 32mm 51mm
ISO7005-1/AS4331.1 ⑤ PN110 (ANSI 600) 610mm 489mm 20 M33 35mm 67mm
ISO7005-1/AS4331.1 ⑤ PN150 (ANSI 900) 675mm 533mm 20 M36 39mm 79mm
ISO7005-1/AS4331.1 ⑤ PN260 (ANSI 1500) 760mm 571mm 16 M52 55mm 124mm
ISO7005-1/AS4331.1 ⑤ PN260 (ANSI 2500) 619mm 619mm 12 M70 74mm 184mm
AS2129 ① Table C 455mm 406mm 12 M20 22mm 29mm 29mm 22mm
AS2129 ① Table D 455mm 406mm 12 M20 22mm 25mm 22mm 22mm
AS2129 ① Table E 455mm 406mm 12 M24 26mm 29mm 25mm 25mm
AS2129 ① Table F 490mm 438mm 16 M24 26mm 32mm 29mm 29mm
AS2129 ① Table H 490mm 438mm 16 M24 26mm 44mm 38mm 38mm
AS2129 ① Table J 490mm 438mm 16 M27 30mm 51mm
AS4087 ① PN14 455mm 406mm 12 M20 22mm 29mm
AS4087 ① PN16 455mm 406mm 12 M20 22mm 30mm 23mm
AS4087 ① PN21 490mm 438mm 16 M24 26mm 32mm 30mm
AS4087 ① PN35 490mm 438mm 16 M24 26mm 44mm 38mm 38mm
BS10 Table D 18″ / 457mm 16″ / 406mm 12 3/4″ 7/8″ / 22mm 1″ / 25mm 7/8″ / 22mm 7/8″ / 22mm
BS10 Table E 18″ / 457mm 16″ / 406mm 12 7/8″ 1″ / 25mm 1 1/8 / 29mm 1″ / 25mm 1″ / 25mm
BS10 Table F 19 1/4″ / 489mm 17 1/4″ / 438mm 16 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1 1/8″ / 29mm 1 1/8″ / 29mm
BS10 Table H 19 1/4″ / 489mm 17 1/4″ / 438mm 16 7/8″ 1″ / 25mm 1 3/4″ / 44mm 1 1/2″ / 38mm 1 1/2″ / 38mm
BS10 Table J 19 1/4″ / 489mm 17 1/4″ / 438mm 16 1″ 1 1/8″ / 29mm 2″ / 51mm
BS10 Table K 19 1/4″ / 489mm 17″ / 432mm 16 1 1/8″ 1 1/4″ / 32mm 1 1/4″ / 32mm
ISO7005-1/2 AS4331.1/.2 ⑤ PN6 440mm 395mm 12 M20 22mm 24mm
ISO7005-1/2 AS4331.1/.2 ⑤ PN10 445mm 400mm 12 M20 22mm 28mm 24.5mm
ISO7005-1/2 AS4331.1/.2 ⑤ PN16 460mm 410mm 12 M24 26mm 32mm 24.5mm
ISO7005-1/2 AS4331.1/.2 ⑤ PN25 485mm 430mm 16 M27 30mm 40mm 27.5mm
ISO7005-1/2 AS4331.1/.2 ⑤ PN40 515mm 450mm 16 M30 33mm 39.5mm
BS4504 ② PN6 440mm 395mm 12 M20 22mm 24mm
BS4504 ② PN10 445mm 400mm 12 M20 22mm 28mm
BS4504 ② PN16 460mm 410mm 12 M24 26mm 32mm 28mm
BS4504 ② PN25 485mm 430mm 16 M27 30mm 40mm 34mm
BS4504 ② PN40 515mm 450mm 16 M30 33mm 42mm
BS4504 ② PN64 530mm 460mm 16 M33 36mm 52mm
BS4504 ② PN100 585mm 500mm 16 M39 42mm 68mm
EN1092-1/2/3 ③ PN6 440mm 395mm 12 M20 22mm 24mm 22mm
EN1092-1/2/3 ③ PN10 445mm 400mm 12 M20 22mm 28mm 24.5mm 26mm
EN1092-1/2/3 ③ PN16 460mm 410mm 12 M24 26mm 32mm 24.5mm 28mm
EN1092-1/2/3 ③ PN25 485mm 430mm 16 M27 30mm 40mm 27.5mm 34mm
EN1092-1/2/3 ③ PN40 515mm 450mm 16 M30 33mm 39.5mm 42mm
EN1092-1/2/3 ③ PN64 530mm 460mm 16 M33 36mm 52mm
EN1092-1/2/3 ③ PN100 585mm 500mm 16 M39x3 42mm 68mm
JIS B2220/B2239/B2240 5K 430mm 390mm 12 M20 23mm 28mm 22mm 22mm 22mm
JIS B2220/B2239/B2240 10K 445mm 400mm 16 M22 25mm 32mm 24mm 24mm 24mm
JIS B2220/B2239/B2240 16K 480mm 430mm 16 M24 27mm 36mm 30mm 30mm 30mm
JIS B2220/B2239 20K 480mm 430mm 16 M24 27mm 36mm 40mm 30mm

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.

back