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    Size DN450

    FLANGE DIMENSIONS TABLE SIZE (DN) 450 (18″)

    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 25″ / 635mm 22 3/4″ / 578mm 16 1 1/8″ 1 1/4″ / 32mm 1 9/16″ / 40mm 1 9/16″ / 40mm
    ASME Class 150 B16.5/B16.42 25″ / 635mm 22 3/4″ / 578mm 16 1 1/8″ 1 1/4″ / 32mm 38mm
    ASME Class 250 B16.1 28″ / 711mm 24 3/4″ / 629mm 24 1 1/4″ 1 3/8″ / 35mm 60mm
    ASME Class 300 B16.5/B16.42 28″ / 711mm 24 3/4″ / 629mm 24 1 1/4″ 1 3/8″ / 35mm 60mm 2 3/8″ / 60mm
    ASME Class 600 B16.5 29 1/4″ / 743mm 25 3/4″ / 654mm 20 1 5/8″ 1 3/4″ / 44mm 3 1/4″ / 83mm
    ASME Class 900 B16.5 31″ / 787mm 27″ / 686mm 20 1 7/8″ 2″ / 51mm 4″ / 102mm
    ASME Class 1500 B16.5 36″ / 914mm 30 1/2″ / 775mm 16 2 3/4″ 2 7/8″ / 73mm 6 3/8″ / 162mm
    AS2129① Table C 640mm 584mm 12 M24 26mm 35mm 35mm 29mm
    AS2129① Table D 640mm 584mm 12 M24 26mm 32mm 29mm 29mm
    AS2129① Table E 640mm 584mm 16 M24 26mm 35mm 29mm 29mm
    AS2129① Table F 675mm 610mm 20 M30 33mm 38mm 35mm 35mm
    AS2129① Table H 675mm 610mm 20 M30 33mm 54mm 48mm 48mm
    AS2129① Table J 675mm 610mm 20 M33 35mm 60mm
    AS4087① PN14 640mm 584mm 12 M24 26mm 35mm
    AS4087① PN16 640mm 584mm 12 M24 26mm 33mm 30mm
    AS4087① PN21 675mm 610mm 20 M30 33mm 38mm 38mm
    AS4087① PN35 675mm 610mm 20 M30 33mm 54mm 46mm 58mm
    BS10 Table D 25 1/4″ / 641mm 23″ / 584mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1 1/8″ / 29mm 1 1/8″ / 29mm
    BS10 Table E 25 1/4″ / 641mm 23″ / 584mm 16 7/8″ 1″ / 25mm 1 3/8″ / 35mm 1 1/8″ / 29mm 1 1/8″ / 29mm
    BS10 Table F 26 1/2″ / 673mm 24″ / 610mm 20 1 1/8″ 1 1/4″ / 32mm 1 1/2″ / 38mm 1 3/8″ / 35mm 1 3/8″ / 35mm
    BS10 Table H 26 1/2″ / 673mm 24″ / 610mm 20 1 1/8″ 1 1/4″ / 32mm 2 1/8″ / 54mm 1 7/8″ / 48mm 1 7/8″ / 48mm
    BS10 Table J 26 1/2″ / 673mm 24″ / 610mm 20 1 1/4″ 1 3/8″ / 35mm 2 3/8″ / 60mm
    BS10 Table K 28 1/4″ / 718mm 25 3/4″ / 654mm 20 1 3/8″ 1 1/2″ / 38mm 3″ / 76mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN6 595mm 550mm 16 M20 22mm 28mm 25.5mm 22mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN10 615mm 565mm 20 M24 26mm 32mm 30mm 26mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN16 640mm 585mm 20 M27 30mm 40mm 34.5mm 40mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN25 670mm 600mm 20 M33 35.5mm 50mm 46mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN40 685mm 610mm 20 M36 39mm 49mm 57mm
    BS4504② PN6 595mm 550mm 16 M20 22mm 30mm
    BS4504② PN10 615mm 565mm 20 M24 26mm 32mm
    BS4504② PN16 640mm 585mm 20 M27 30mm 40mm
    EN1092-1/2/3③ PN6 595mm 550mm 16 M20 22mm 28mm 25.5mm 22mm
    EN1092-1/2/3③ PN10 615mm 565mm 20 M24 26mm 32mm 30mm 26mm
    EN1092-1/2/3③ PN16 640mm 585mm 20 M27 30mm 40mm 34.5mm 40mm

    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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