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    Size DN300

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

    Class/Table Flange O.D. PCD Bolts Bolt Size Hole Size Minimum Flange Thickness*
    Cast Iron Ductile Iron Copper Alloy Steel
    ASME Class 125 B16.1 19″ / 483mm 17″ / 432mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1 1/16″ / 27mm 1 1/4″ / 32mm
    ASME Class 150 B16.5/B16.42 19″ / 483mm 17″ / 432mm 12 7/8″ 1″ / 25mm 32mm
    ASME Class 250 B16.1 20 1/2″ / 521mm 17 3/4″ / 451mm 16 1 1/8″ 1 1/4″ / 32mm 51mm
    ASME Class 300 B16.5/B16.42 20 1/2″ / 521mm 17 3/4″ / 451mm 16 1 1/8″ 1 1/4″ / 32mm 51mm 2″ / 51mm
    ASME Class 600 B16.5 22″ / 559mm 19 1/4″ / 489mm 20 1 1/4″ 1 3/8″ / 35mm 2 5/8″ / 67mm
    ASME Class 900 B16.5 24″ / 610mm 21″ / 533mm 20 1 3/8″ 1 1/2″ / 38mm 3 1/8″ / 79mm
    ASME Class 1500 B16.5 26 1/2″ / 673mm 22 1/2″ / 572mm 16 2″ 2 1/8″ / 54mm 4 7/8″ / 124mm
    ASME Class 2500 B16.5 30″ / 762.1mm 24 3/8″ / 619mm 12 2 3/4″ 2 7/8″ / 73mm 7 1/4″ / 184mm
    ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 485mm 432mm 12 M24 26mm 32mm
    ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 520mm 451mm 16 M30 32mm 51mm
    ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 610mm 489mm 20 M33 35mm 67mm
    ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 675mm 533mm 20 M36 39mm 79mm
    ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 760mm 571mm 16 M52 55mm 124mm
    ISO7005-1/AS4331.1⑤ PN260 (ANSI 2500) 619mm 619mm 12 M70 74mm 184mm
    AS2129① Table C 455mm 406mm 12 M20 22mm 29mm 29mm 22mm
    AS2129① Table D 455mm 406mm 12 M20 22mm 25mm 22mm 22mm
    AS2129① Table E 455mm 406mm 12 M24 26mm 29mm 25mm 25mm
    AS2129① Table F 490mm 438mm 16 M24 26mm 32mm 29mm 29mm
    AS2129① Table H 490mm 438mm 16 M24 26mm 44mm 38mm 38mm
    AS2129① Table J 490mm 438mm 16 M27 30mm 51mm
    AS4087① PN14 455mm 406mm 12 M20 22mm 29mm
    AS4087① PN16 455mm 406mm 12 M20 22mm 30mm 23mm
    AS4087① PN21 490mm 438mm 16 M24 26mm 32mm 30mm
    AS4087① 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/.2⑤ PN6 440mm 395mm 12 M20 22mm 24mm
    ISO7005-1/2 AS4331.1/.2⑤ PN10 445mm 400mm 12 M20 22mm 28mm 24.5mm
    ISO7005-1/2 AS4331.1/.2⑤ PN16 460mm 410mm 12 M24 26mm 32mm 24.5mm
    ISO7005-1/2 AS4331.1/.2⑤ PN25 485mm 430mm 16 M27 30mm 40mm 27.5mm
    ISO7005-1/2 AS4331.1/.2⑤ PN40 515mm 450mm 16 M30 33mm 39.5mm
    BS4504② PN6 440mm 395mm 12 M20 22mm 24mm
    BS4504② PN10 445mm 400mm 12 M20 22mm 28mm
    BS4504② PN16 460mm 410mm 12 M24 26mm 32mm 28mm
    BS4504② PN25 485mm 430mm 16 M27 30mm 40mm 34mm
    BS4504② PN40 515mm 450mm 16 M30 33mm 42mm
    BS4504② PN64 530mm 460mm 16 M33 36mm 52mm
    BS4504② PN100 585mm 500mm 16 M39 42mm 68mm
    EN1092-1/2/3③ PN6 440mm 395mm 12 M20 22mm 24mm 22mm
    EN1092-1/2/3③ PN10 445mm 400mm 12 M20 22mm 28mm 24.5mm 26mm
    EN1092-1/2/3③ PN16 460mm 410mm 12 M24 26mm 32mm 24.5mm 28mm
    EN1092-1/2/3③ PN25 485mm 430mm 16 M27 30mm 40mm 27.5mm 34mm
    EN1092-1/2/3③ PN40 515mm 450mm 16 M30 33mm 39.5mm 42mm
    EN1092-1/2/3③ PN64 530mm 460mm 16 M33 36mm 52mm
    EN1092-1/2/3③ PN100 585mm 500mm 16 M39x3 42mm 68mm

    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 ISO7500-1 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. 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 & ISO 7005-2 (which AS4331.1 mirrors) replaces DIN 2501 & DIN 2533 and BS4504 PN6 to 40. ISO7005-1 & 7005-2 PN6 to 40 is the same as EN1092-1 (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, ISO7005-2/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.

    * Varies according to flange type (thickness includes raised face height where applicable) refer to standard

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