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    Size DN500

    FLANGE DIMENSIONS TABLE SIZE (DN) 500 (20″)

    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 27 1/2″ / 699mm 25″ / 635mm 20 1 1/8″ 1 1/4″ / 32mm 1 11/16″ / 43mm 1 11/16″ / 43mm
    ASME Class 150 B16.5/B16.42 27 1/2″ / 699mm 25″ / 635mm 20 1 1/8″ 1 1/4″ / 32mm 43mm
    ASME Class 250 B16.1 30 1/2″ / 775mm 27″ / 686mm 24 1 1/4″ 1 3/8″ / 35mm 63mm
    ASME Class 300 B16.5/B16.42 30 1/2″ / 775mm 27″ / 686mm 24 1 1/4″ 1 3/8″ / 35mm 63mm 2 1/2″ / 64mm
    ASME Class 600 B16.5 32″ / 813mm 28 1/2″ / 724mm 24 1 5/8″ 1 3/4″ / 44mm 3 1/2″ / 89mm
    ASME Class 900 B16.5 33 1/4″ / 845mm 29 1/2″ / 749mm 20 2″ 2 1/8″ / 54mm 4 1/4″ / 108mm
    ASME Class 1500 B16.5 38 3/4″ / 984mm 32 3/4″ / 832mm 16 3″ 3 1/8″ / 79mm 7″ / 178mm
    ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 700mm 635mm 20 M30 32.5mm 43mm
    ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 775mm 686mm 24 M33 32.5mm 63.5mm
    ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 815mm 724mm 24 M42 45mm 89mm
    ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 855mm 749.5mm 20 M52 55mm 108mm
    ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 985mm 832mm 16 M76 80mm 178mm
    ISO7005-1/AS4331.1⑤ PN420 (ANSI 2500)
    AS2129① Table C 705mm 641mm 16 M24 26mm 38mm 38mm 32mm
    AS2129① Table D 705mm 641mm 16 M24 26mm 32mm 32mm 32mm
    AS2129① Table E 705mm 641mm 16 M24 26mm 38mm 32mm 32mm
    AS2129① Table F 735mm 673mm 24 M30 33mm 41mm 38mm 38mm
    AS2129① Table H 735mm 673mm 24 M30 33mm 57mm 51mm 51mm
    AS2129① Table J 735mm 673mm 24 M33 36mm 64mm
    AS4087① PN14 705mm 641mm 16 M24 26mm 38mm
    AS4087① PN16 705mm 641mm 16 M24 26mm 35mm 38mm
    AS4087① PN21 735mm 673mm 24 M30 33mm 41mm 48mm
    AS4087① PN35 735mm 673mm 24 M30 33mm 57mm 49mm 88mm
    BS10 Table D 27 3/4″ / 705mm 25 1/4″ / 641mm 16 7/8″ 1″ / 25mm 1 1/4″ / 32mm 1 1/4″ / 32mm 1 1/4″ / 32mm
    BS10 Table E 27 3/4″ / 705mm 25 1/4″ / 641mm 16 7/8″ 1″ / 25mm 1 1/2″ / 38mm 1 1/4″ / 32mm 1 1/4″ / 32mm
    BS10 Table F 29″ / 737mm 26 1/2″ / 673mm 20 1 1/8″ 1 1/4″ / 32mm 1 5/8″ / 41mm 1 1/2″ / 38mm 1 1/2″ / 38mm
    BS10 Table H 29″ / 737mm 26 1/2″ / 673mm 20 1 1/8″ 1 1/4″ / 32mm 2 1/4″ / 57mm 2″ / 51mm 2″ / 51mm
    BS10 Table J 29″ / 737mm 26 1/2″ / 673mm 20 1 1/4″ 1 3/8″ / 35mm 2 1/2″ / 64mm
    BS10 Table K 31″ / 787mm 28″ / 711mm 20 1 1/2″ 1 5/8″ / 41mm 3 1/4″ / 83mm
    ISO7005-1/2/AS4331.1/.2⑤ PN6 645mm 600mm 20 M20 22mm 30mm 25.5mm 26mm
    ISO7005-1/2/AS4331.1/.2⑤ PN10 670mm 620mm 20 M24 26mm 34mm 26.5mm 28mm
    ISO7005-1/2/AS4331.1/.2⑤ PN16 650 20 M30 32.5mm 42mm 31.5mm 44mm
    ISO7005-1/2/AS4331.1/.2⑤ PN25 730mm 660mm 20 M33 36mm 52mm 36.5mm 48mm
    ISO7005-1/2/AS4331.1/.2⑤ PN40 755mm 670mm 20 M39 42mm 52mm 57mm
    BS4504② PN6 645mm 600mm 20 M20 22mm 30mm
    BS4504② PN10 670mm 620mm 20 M24 26mm 34mm
    BS4504② PN16 715mm 650mm 20 M30 33mm 42mm 36mm
    BS4504② PN25 730mm 660mm 20 M33 36mm 52mm 44mm
    BS4504② PN40 755mm 670mm 20 M39 42mm 52mm
    BS4504② PN64 800mm 705mm 20 M45 58mm 67mm
    BS4504② PN100 870mm 760mm 20 M52 56mm 94mm
    EN1092-1/2/3③ PN6 645mm 600mm 20 M20 22mm 30mm 24mm
    EN1092-1/2/3③ PN10 675mm 620mm 20 M24 26mm 34mm 26.5mm 28mm
    EN1092-1/2/3③ PN16 715mm 650mm 20 M30 33mm 42mm 31.5mm 44mm
    EN1092-1/2/3③ PN25 730mm 660mm 20 M33 36mm 52mm 36.5mm 48mm
    EN1092-1/2/3③ PN40 755mm 670mm 20 M39 42mm 52mm 57mm
    EN1092-1/2/3③ PN63 800mm 705mm 20 M45 58mm 67mm
    EN1092-1/2/3③ PN100 870mm 760mm 20 M52 56mm 94mm

    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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