Size DN65

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FLANGE DIMENSIONS TABLE SIZE (DN) 65 (2 1/2″)

Class/Table Flange O.D. PCD Bolts Bolt Size Hole Size Minimum Flange Thickness*
Cast Iron Copper Alloy Ductile Iron Steel
ASME Class 125 B16.1 7″ / 178mm 5 1/2″ / 139.7mm 4 5/8″ 3/4″ / 19mm 11/16″ / 17mm 9/16″ / 14mm 11/16″ / 17mm
ASME Class 150 B16.24/B16.42/B16.5 7″ / 178mm 5 1/2″ / 139.7mm 4 5/8″ 3/4″ / 19mm 14.2mm 22mm 20.6mm
ASME Class 250 B16.1 7 1/2″ / 191mm 5 7/8″ / 149.2mm 8 3/4″ 7/8″ / 22mm 25mm
ASME Class 300 B16.24/B16.42/B16.5 7 1/2″ / 191mm 5 7/8″ / 149.2mm 8 3/4″ 7/8″ / 22mm 13/16″ / 21mm 25mm 1″ / 25mm
ASME Class 600 B16.5 7 1/2″ / 191mm 5 7/8″ / 149.2mm 8 3/4″ 7/8″ / 22mm 1 1/8″ / 29mm
ASME Class 900 B16.5 9 5/8″ / 244mm 7 1/2″ / 190.5mm 8 1″ 1 1/8″ / 29mm 1 5/8″ / 41mm
ASME Class 1500 B16.5 9 5/8″ / 244mm 7 1/2″ / 190.5mm 8 1″ 1 1/8″ / 29mm 1 5/8″ / 41mm
ASME Class 2500 B16.5 10 1/2″ / 267mm 7 3/4″ / 196.8mm 8 1 1/8″ 1 1/4″ / 32mm 2 1/4″ / 57mm
ISO7005-1/AS4331.1⑤ PN20 (ANSI 150) 180mm 139mm 4 M16 18mm 22mm
ISO7005-1/AS4331.1⑤ PN50 (ANSI 300) 190mm 149mm 8 M20 22mm 25mm
ISO7005-1/AS4331.1⑤ PN110 (ANSI 600) 190mm 149mm 8 M20 22mm 29mm
ISO7005-1/AS4331.1⑤ PN150 (ANSI 900) 245mm 190mm 8 M27 29mm 41mm
ISO7005-1/AS4331.1⑤ PN260 (ANSI 1500) 245mm 190mm 8 M27 29mm 41mm
ISO7005-1/AS4331.1⑤ PN420 (ANSI 2500) 265mm 197mm 8 M30 32mm 57mm
AS2129① Table C 165mm 127mm 4 M16 18mm 19mm 19mm 14mm
AS2129① Table D 165mm 127mm 4 M16 18mm 17mm 11mm 14mm
AS2129① Table E 165mm 127mm 4 M16 18mm 19mm 11mm 14mm
AS2129① Table F 185mm 146mm 8 M16 18mm 19mm 13mm 16mm
AS2129① Table H 185mm 146mm 8 M16 18mm 25mm 14mm 19mm
AS2129① Table J 185mm 146mm 8 M20 22mm 25mm 25mm
AS4087① PN14 165mm 127mm 4 M16 18mm 11mm
AS4087① PN16 165mm 127mm 4 M16 18mm 11mm
AS4087① PN21 185mm 146mm 8 M16 18mm 15mm
AS4087 ①PN35 19mm
BS10 Table D 6 1/2″ / 165mm 5″ / 127mm 4 5/8″ 11/16″ / 17mm 11/16″ / 17mm 7/16″ / 11mm 9/16″ / 14mm
BS10 Table E 6 1/2″ / 165mm 5″ / 127mm 4 5/8″ 11/16″ / 17mm 3/4″ / 19mm 7/16″ / 11mm 9/16″ / 14mm
BS10 Table F 7 1/4″ / 184mm 5 3/4″ / 146mm 8 5/8″ 11/16″ / 17mm 3/4″ / 19mm 1/2″ / 13mm 5/8″ / 16mm
BS10 Table H 7 1/4″ / 184mm 5 3/4″ / 146mm 8 5/8″ 11/16″ / 17mm 1″ / 25mm 9/16″ / 14mm 3/4″ / 19mm
BS10 Table J 7 1/4″ / 184mm 5 3/4″ / 146mm 8 3/4″ 7/8″ / 22mm 1″ / 25mm 1″ / 25mm
BS10 Table K 7 1/4″ / 184mm 5 3/4″ / 146mm 8 3/4″ 7/8″ / 22mm 1 1/8″ / 29mm 1 1/8″ / 29mm
ISO7005-1/2 AS4331.1/.2⑤ PN6 160mm 130mm 4 M12 14mm 16mm 14mm
ISO7005-1/2 AS4331.1/.2⑤ PN10 185mm 145mm 8 M16 18mm 20mm 19mm 18mm
ISO7005-1/2 AS4331.1/.2⑤ PN16 185mm 145mm 8 M16 18mm 20mm 19mm 18mm
ISO7005-1/2 AS4331.1/.2⑤ PN25 185mm 145mm 8 M16 18mm 24mm 19mm 22mm
ISO7005-1/2 AS4331.1/.2⑤ PN40 185mm 145mm 8 M16 18mm 19mm 22mm
BS4504② PN6 160mm 130mm 4 M12 14mm 16mm
BS4504② PN10 185mm 145mm 4 M16 18mm 20mm
BS4504② PN16 185mm 145mm 4 ⑥ M16 18mm 20mm 13mm 18mm
BS4504② PN25 185mm 145mm 8 M16 18mm 24mm 13mm 22mm
BS4504② PN40 185mm 145mm 8 M16 18mm 14mm 22mm
BS4504② PN64 205mm 160mm 8 M20 22mm 26mm
BS4504② PN100 220mm 170mm 8 M24 26mm 34mm
EN1092-1/2/3③ PN6 160mm 130mm 4 M12 14mm 16mm 14mm
EN1092-1/2/3 ③PN10 185mm 145mm 8 M16 18mm 20mm 19mm 18mm
EN1092-1/2/3③ PN16 185mm 145mm 8 M16 18mm 20mm 19mm 18mm
EN1092-1/2/3③ PN25 185mm 145mm 8 M16 18mm 24mm 19mm 22mm
EN1092-1/2/3③ PN40 185mm 145mm 8 M16 18mm 19mm 22mm
EN1092-1/2/3③ PN63 205mm 160mm 8 M20 22mm 26mm
EN1092-1/2/3③ PN100 220mm 170mm 8 M22 26mm 30mm

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 ISO7005-1 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 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 & ISO7005-2 (which AS4331.1/2 mirrors) replaces DIN 2501 & DIN 2533 and BS4504 PN6 to 40. ISO7005-1 & 7005-2 PN6 to 40 is the same as EN1092-1/2 (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 (ISO7005-1 refers to EN1092-1 for steel flange sizes), 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. Note where we combine ISO/AS/EN above, some standards do not publish some flange materials, so do not assume CI/DI/Steel/Copper Alloy is published in all three standards. The thicknesses for integral flanges are not the same as for welding & blind flanges. Furthermore ISO7005-1 PN ratings refer to EN 1092-1 which are also published below. EN 1092-2 ratings are generally also aligned with ISO7005-2 which once again are also published below.

According to EN 1092-1 steel flanges in this DN and PN may be supplied with 8 holes.  For compliance with these, equivalent cast iron flanges may be supplied with eight holes, as special order and after agreement between manufacturer and customer.

* Varies according to flange type (thickness usually includes raised face height where applicable) refer to standard. Some standards publish integral flange thicknesses used for valves which are often different than blind or welding flange thicknesses hence refer to standard for clarification. Refer links to flange standards in the technical screen of our website.

This above table is a rough ready reckoner only to understand standards, differences & commonality and to assess interchangeability. Refer to the standard required itself before manufacture.

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