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    Size DN350

    FLANGE DIMENSIONS TABLE SIZE (DN) 350 (14″)

    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 21″ / 533mm 18 3/4″ / 476mm 12 1″ 1 1/8″ / 29mm 1 3/8″ / 35mm 1 3/8″ / 35mm
    ASME Class 150 B16.5/B16.42 21″ / 533mm 18 3/4″ / 476mm 12 1″ 1 1/8″ / 29mm 35mm
    ASME Class 250 B16.1 21″ / 533mm 18 3/4″ / 476mm 12 1″ 1 1/8″ / 29mm 54mm
    ASME Class 300 B16.5/B16.42 23″ / 584mm 20 1/4″ / 514mm 20 1 1/8″ 1 1/4″ / 32mm 54mm 2 1/8″ / 54mm
    ASME Class 600 B16.5 23 3/4″ / 603mm 20 3/4″ / 527mm 20 1 3/8″ 1 1/2″ / 38mm 2 3/4″ / 70mm
    ASME Class 900 B16.5 25 1/4″ / 641mm 22″ / 559mm 20 1 1/2″ 1 5/8″ / 41mm 3 3/8″ / 86mm
    ASME Class 1500 B16.5 29 1/2″ / 749mm 25″ / 635mm 16 2 1/4″ 2 3/8″ / 60mm 5 1/4″ / 133mm
    ISO7005-1/AS4334.1⑤  PN20 (ANSI 150) 535mm 476mm 12 M27 29mm 35mm
    ISO7005-1/AS4334.1⑤  PN50 (ANSI 300) 585mm 514mm 20 M30 32mm 54mm
    ISO7005-1/AS4334.1⑤  PN110 (ANSI 600) 605mm 527mm 20 M36 39mm 70mm
    ISO7005-1/AS4334.1⑤  PN150 (ANSI 900) 640mm 559mm 20 M39 42mm 86mm
    ISO7005-1/AS4334.1⑤  PN260 (ANSI 1500) 750mm 635mm 16 M56 60mm 133mm
    ISO7005-1/AS4334.1⑤  PN420 (ANSI 2500)
    AS2129① Table C 525mm 470mm 12 M24 26mm 32mm 32mm 25mm
    AS2129① Table D 525mm 470mm 12 M24 26mm 29mm 25mm 25mm
    AS2129① Table E 525mm 470mm 12 M24 26mm 32mm 25mm 25mm
    AS2129① Table F 550mm 495mm 16 M27 30mm 35mm 32mm 32mm
    AS2129① Table H 550mm 495mm 16 M27 30mm 48mm 41mm 41mm
    AS2129① Table J 550mm 495mm 16 M30 33mm 54mm
    AS4087① PN14 525mm 470mm 12 M24 26mm 32mm
    AS4087① PN16 525mm 470mm 12 M24 26mm 33mm 30mm
    AS4087① PN21 550mm 495mm 16 M27 30mm 35mm 30mm
    AS4087① PN35 550mm 495mm 16 M27 30mm 48mm 41mm 48mm
    BS10 Table D 20 3/4″ / 527mm 18 1/2″ / 470mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1″ / 25mm 1″ / 25mm
    BS10 Table E 20 3/4″ / 527mm 18 1/2″ / 470mm 12 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1″ / 25mm 1″ / 25mm
    BS10 Table F 21 3/4″ / 552mm 19 1/2″ / 495mm 16 1″ 1 1/8″ / 29mm 1 3/8″ / 35mm 1 1/4″ / 32mm 1 1/4″ / 32mm
    BS10 Table H 21 3/4″ / 552mm 19 1/2″ / 495mm 16 1″ 1 1/8″ / 29mm 1 7/8″ / 48mm 1 5/8″ / 41mm 1 5/8″ / 41mm
    BS10 Table J 21 3/4″ / 552mm 19 1/2″ / 495mm 16 1 1/8″ 1 1/4″ / 32mm 2 1/8″ / 54mm
    BS10 Table K 22 1/2″ / 572mm 20″ / 508mm 16 1 1/4″ 1 3/8″ / 35mm 2 3/8″ / 60mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN6 490mm 445mm 12 M20 22mm 26mm 22mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN10 505mm 460mm 16 M20 22mm 30mm 24.5mm 26mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN16 520mm 470mm 16 M24 26mm 36mm 26.5mm 30mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN25 555mm 490mm 16 M30 33mm 44mm 30mm 38mm
    ISO7005-1/2/ AS4331.1/.2⑤ PN40 580mm 510mm 16 M33 36mm 44mm 46mm
    BS4504-PN6 490mm 445mm 12 M20 22mm 26mm
    BS4504-PN10 505mm 460mm 16 M20 22mm 30mm
    BS4504-PN16 520mm 470mm 16 M24 26mm 36mm 30mm
    BS4504-PN25 555mm 490mm 16 M30 33mm 44mm 38mm
    BS4504-PN40 580mm 510mm 16 M33 36mm 46mm
    BS4504-PN64 600mm 525mm 16 M36 39mm 56mm
    BS4504-PN100 655mm 560mm 16 M45 48mm 74mm
    EN1092-1/2/3③ PN6 490mm 445mm 12 M20 22mm 26mm 22mm
    EN1092-1/2/3③ PN10 505mm 460mm 16 M20 22mm 30mm 24.5mm 26mm
    EN1092-1/2/3③ PN16 520mm 470mm 16 M24 26mm 36mm 26.5mm 30mm
    EN1092-1/2/3③ PN25 555mm 490mm 16 M30 33mm 44mm 30mm 38mm
    EN1092-1/2/3③ PN40 580mm 510mm 16 M33 36mm 44mm 46mm
    EN1092-1/2/3③ PN63 600mm 525mm 16 M36 39mm 56mm
    EN1092-1/2/3③ PN100 655mm 560mm 16 M45x3 48mm 74mm

    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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