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    FLANGE DIMENSIONS TABLE SIZE (DN) 50 (2″)

    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 6″ / 152mm 4 3/4″ / 121mm 4 5/8″ 3/4″ / 19mm 5/8″ / 16mm 1/2″ / 13mm 5/8″ / 16mm
    ASME Class 150 B16.5/B16.42 6″ / 152mm 4 3/4″ / 121mm 4 5/8″ 3/4″ / 19mm 19mm 5/8″ / 16mm
    ASME Class 250 B16.1 6 1/2″ / 165mm 5″ / 127mm 8 5/8″ 3/4″ / 19mm 22mm
    ASME Class 300 B16.5/B16.42 6 1/2″ / 165mm 5″ / 127mm 8 5/8″ 3/4″ / 19mm 22mm 3/4″ / 19mm 7/8″ / 22mm
    ASME Class 600 B16.5 6 1/2″ / 165mm 5″ / 127mm 8 5/8″ 3/4″ / 19mm 1″ / 25mm
    ASME Class 900 B16.5 8 1/2″ / 216mm 6 1/2″ / 165mm 8 7/8″ 1″ / 25mm 1 1/2″ / 38mm
    ASME Class 1500 B16.5 8 1/2″ / 216mm 6 3/4″ / 171mm 8 7/8″ 1″ / 25mm 1 1/2″ / 38mm
    ASME Class 2500 B16.5 9 1/4″ / 235mm 6 3/4″ / 171mm 8 1″ 1 1/8″ / 29mm 2″ / 51mm
    ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 150mm 120mm 4 M16 18mm 19mm
    ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 165mm 127mm 8 M16 18mm 22mm
    ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 165mm 127mm 8 M16 18mm 25mm
    ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 215mm 165mm 8 M24 26mm 38mm
    ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 215mm 165mm 8 M24 26mm 38mm
    ISO7005-1/AS4331.1⑤ PN420 (ANSI 2500) 235mm 171mm 8 M27 29mm 51mm
    AS2129① Table C 150mm 114mm 4 M16 18mm 19mm 19mm 14mm
    AS2129① Table D 150mm 114mm 4 M16 18mm 17mm 10mm 14mm
    AS2129① Table E 150mm 114mm 4 M16 18mm 19mm 10mm 14mm
    AS2129① Table F 165mm 127mm 4 M16 18mm 19mm 11mm 16mm
    AS2129① Table H 165mm 127mm 4 M16 18mm 25mm 16mm 19mm
    AS2129① Table J 165mm 127mm 4 M20 22mm 25mm 25mm
    AS4087① PN14 150mm 114mm 4 M16 18mm 10mm
    AS4087① PN16 150mm 114mm 4 M16 18mm 11mm
    AS4087① PN21 165mm 127mm 4 M16 18mm 15mm
    AS4087① PN35 19mm
    BS10 Table D 6″ / 152mm 4 1/2″ / 114mm 4 5/8″ 11/16″ / 17mm 11/16″ / 17mm 3/8″ / 10mm 9/16″ / 14mm
    BS10 Table E 6″ / 152mm 4 1/2″ / 114mm 4 5/8″ 11/16″ / 17mm 3/4″ / 19mm 3/8″ / 10mm 9/16″ / 14mm
    BS10 Table F 6 1/2″ / 165mm 5″ / 127mm 4 5/8″ 11/16″ / 17mm 3/4″ / 19mm 7/16″ / 11mm 5/8″ / 16mm
    BS10 Table H 6 1/2″ / 165mm 5″ / 127mm 4 5/8″ 11/16″ / 17mm 1″ / 25mm 1/2″ / 13mm 3/4″ / 19mm
    BS10 Table J 6 1/2″ / 165mm 5″ / 127mm 4 3/4″ 7/8″ / 22mm 1″ / 25mm 1″ / 25mm
    BS10 Table K 6 1/2″ / 165mm 5″ / 127mm 8 5/8″ 11/16″ / 17mm 1″ / 25mm 1″ / 25mm
    ISO7005-1/2 AS4331.1/.2⑤ PN6 140mm 110mm 4 M12 14mm 16mm 14mm
    ISO7005-1/2 AS4331.1/.2⑤ PN10 165mm 125mm 4 M16 18mm 20mm 19mm 18mm
    ISO7005-1/2 AS4331.1/.2⑤ PN16 165mm 125mm 4 M16 18mm 20mm 19mm 18mm
    ISO7005-1/2 AS4331.1/.2⑤ PN25 165mm 125mm 4 M16 18mm 22mm 19mm 20mm
    ISO7005-1/2 AS4331.1/.2⑤ PN40 165mm 125mm 4 M16 14mm 19mm 20mm
    BS4504② PN6 140mm 110mm 4 M12 14mm 16mm
    BS4504② PN10 165mm 125mm 4 M16 18mm 20mm
    BS4504② PN16 165mm 125mm 4 M16 18mm 20mm 11mm 20mm
    BS4504② PN25 165mm 125mm 4 M16 18mm 22mm 11mm 20mm
    BS4504② PN40 165mm 125mm 4 M16 18mm 13mm 20mm
    BS4504② PN100 195mm 145mm 4 M24 26mm 26mm
    EN1092-1/2/3③ PN6 140mm 110mm 4 M12 14mm 16mm 14mm
    EN1092-1/2/3③ PN10 165mm 125mm 4 M16 18mm 20mm 19mm 18mm
    EN1092-1/2/3③ PN16 165mm 125mm 4 M16 18mm 20mm 19mm 18mm
    EN1092-1/2/3③ PN25 165mm 125mm 4 M16 18mm 22mm 19mm 20mm
    EN1092-1/2/3③ PN40 165mm 125mm 4 M16 18mm 19mm 20mm
    EN1092-1/2/3③ PN63 180mm 135mm 4 M20 22mm 26mm
    EN1092-1/2/3③ PN100 195mm 145mm 4 M22 26mm 28mm

    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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