flange standards table

Flange Standards & Dimensions

Flanges are essential components used to connect valves into pipework, facilitating easier removal and maintenance. There are various common flange standards, each with distinct features. Flanges within the same standard can either be flat (typically cast iron or ductile iron) or raised face (commonly cast steel and stainless steel). Below is a reference table detailing critical flange dimensions to aid in identifying the standard you have:

Hazardous areas
5mm (1/2")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN1495674M1214
AS 2129Table C95674M1214
Table D95674M1214
Table E95674M1214
Table F95674M1214
Table H114834M1617
Table J114834M1617
ANSI B16.5ANSI 150896041316
ANSI 300956741316
ANSI 600956741316
ANSI 9001218341922
ANSI 15001218341922
ISO 7005 (DIN)PN680554M1011
PN1095654M1214
PN1695654M1214
PN209060.54M1416
PN2595654M1214
PN4095654M1214
20mm (3/4")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14100734M1214
AS 2129Table C100734M1214
Table D100734M1214
Table E100734M1214
Table F100734M1214
Table H115834M1218
Table J115834M1218
ANSI B16.5ANSI 15098704M1316
ANSI 300117834M1619
ANSI 600117834M1619
ANSI 9001308941922
ANSI 15001308941922
ISO 7005 (DIN)PN690654M1011
PN10105754M1214
PN16105754M1214
PN20100704M1416
PN25105754M1214
PN40105754M1214
25mm (1")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14115834M1214
AS 2129Table C115834M1214
Table D115834M1214
Table E115834M1214
Table F120874M1618
Table H120874M1618
Table J120874M1618
ANSI B16.5ANSI 1501107941316
ANSI 3001258941619
ANSI 6001258941619
ANSI 90010242225
ANSI 150010242225
ISO 7005 (DIN)PN6100784M1011
PN10155854M1214
PN16155854M1214
PN2011079.54M1416
PN25115854M1214
PN40115854M1214
32mm (1 1/4")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14120874M1214
AS 2129Table C120874M1214
Table D120874M1214
Table E120874M1214
Table F135984M1618
Table H135984M1618
Table J135984M1618
ANSI B16.5ANSI 1501178941316
ANSI 3001339841619
ANSI 6001339841619
ANSI 90015911142225
ANSI 150015911142225
ISO 7005 (DIN)PN6120904M1214
PN101401004M1618
PN161401004M1618
PN20120894M1416
PN251401004M1618
PN401401004M1618
40mm (1 1/2")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14135984M1214
AS 2129Table C135984M1214
Table D135984M1214
Table E135984M1214
Table F1401054M1618
Table H1401054M1618
Table J1401054M1618
ANSI B16.5ANSI 1501279841316
ANSI 30015611441922
ANSI 60015611441922
ANSI 90017812442529
ANSI 150017812442529
ISO 7005 (DIN)PN61301004M1214
PN101501104M1618
PN161501104M1618
PN2013098.54M1416
PN251501104M1618
PN401501104M1618
50mm (2")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN141501144M1618
PN161501144M1618
PN211651274M1618
PN351651274M1618
AS 2129Table C1501144M1618
Table D1501144M1618
Table E1501144M1618
Table F1651274M1618
Table H1651274M1618
Table J1651274M2022
ANSI B16.5ANSI 15015212141619
ANSI 30016512781619
ANSI 60016512781619
ANSI 90021616582225
ANSI 150021616582225
ISO 7005 (DIN)PN61401104M1214
PN101651254M1618
PN161651254M1618
PN20150*120.54M1618
PN251651254M1618
PN401651254M1618
* When made from cast or ductile iron the OD is 155mm.
65mm (2 1/2")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN141651274M1618
PN161651274M1618
PN211851468M1618
PN351851468M1618
AS 2129Table C1651274M1618
Table D1651274M1618
Table E1651274M1618
Table F1851468M1618
Table H1851468M1618
Table J1851468M2022
ANSI B16.5ANSI 15017814041619
ANSI 30019114981922
ANSI 60019114981922
ANSI 90024419182225
ANSI 150024419182529
ISO 7005 (DIN)PN61601304M1214
PN101851454M1618
PN161851454M1618
PN20180139.54M1618
PN251851458M1618
PN401851458M1618
80mm (3")
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN141851464M1618
PN161851464M1618
PN212051658M1618
PN352051658M1618
AS 2129Table C1851464M1618
Table D1851464M1618
Table E1851464M1618
Table F2051658M1618
Table H2051658M1618
Table J2051658M2022
ANSI B16.5ANSI 15019115241619
ANSI 30021016881922
ANSI 60021016881922
ANSI 90024119282225
ANSI 150026720382932
ISO 7005 (DIN)PN61901504M1618
PN102001608M1618
PN162001608M1618
PN20190152.54M1618
PN252001608M1618
PN401851608M1618
100mm (4") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN142151784M1618
PN162151784M1618
PN212301918M1618
PN352301918M1618
AS 2129Table C2151784M1618
Table D2151784M1618
Table E2151788M1618
Table F2301918M1618
Table H2301918M1618
Table J2301918M2022
ANSI B16.5ANSI 15022919181619
ANSI 30025420081922
ANSI 60027321682225
ANSI 90029223582932
ANSI 150031124183235
ISO 7005 (DIN)PN62101704M1618
PN102201808M1624
PN162201808M1618
PN20230190.58M1618
PN252351908M2022
PN402351908M2022
125mm (5") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN142552108M1618
PN162552108M1618
PN212802358M2022
PN352802358M2022
AS 2129Table C2552108M1618
Table D2552108M1618
Table E2552108M1618
Table F2802358M2022
Table H2802358M2022
Table J2802358M2426
ANSI B16.5ANSI 15025421681922
ANSI 30027923581922
ANSI 60033026782529
ANSI 90034927983235
ANSI 150037529283841
ISO 7005 (DIN)PN62402008M1618
PN102502108M1618
PN162502108M1618
PN202552168M2022
PN252702208M2426
PN402702208M2426
150mm (6") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN142802358M1618
PN162802358M1618
PN2130526012M2022
PN3530526012M2022
AS 2129Table C2802358M1618
Table D2802358M1618
Table E2802358M2022
Table F30526012M2022
Table H30526012M2022
Table J30526012M2426
ANSI B16.5ANSI 15027924181922
ANSI 300318270121922
ANSI 600356292122529
ANSI 900381318122932
ANSI 1500394318123538
ISO 7005 (DIN)PN62652258M1618
PN102852408M2022
PN162852408M2022
PN20280241.58M2022
PN253002508M2426
PN403002508M2426
200mm (8") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN143352928M1618
PN163352928M1618
PN2137032412M2022
PN3537032412M2022
AS 2129Table C3352928M1618
Table D3352928M1618
Table E3352928M2022
Table F37032412M2022
Table H37032412M2022
Table J37032412M2426
ANSI B16.5ANSI 15034329881922
ANSI 300381330121922
ANSI 600419349122932
ANSI 900470394123538
ANSI 1500483394124144
ISO 7005 (DIN)PN63202808M1618
PN103402958M2022
PN1634029512M2022
PN20335298.512M2022
PN2536031012M2426
PN4036031012M2426
250mm (10") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN144053568M2022
PN164053568M2022
PN2143038112M2426
PN3543038112M2426
AS 2129Table C4053568M2022
Table D4053568M2022
Table E40535612M2022
Table F43038112M2426
Table H43038112M2426
Table J43038112M2730
ANSI B16.5ANSI 150406362122225
ANSI 300445387162529
ANSI 600508432163235
ANSI 900546470163538
ANSI 1500584483124151
ISO 7005 (DIN)PN637533512M1618
PN1039535012M2022
PN1640535512M2426
PN2040536212M2426
PN2542537012M2730
PN4045038512M3033
300mm (12") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN1445540612M2022
PN1645540612M2022
PN2149043816M2426
PN3549043816M2426
AS 2129Table C45540612M2022
Table D45540612M2022
Table E45540612M2426
Table F49043816M2426
Table H49043816M2426
Table J49043816M2730
ANSI B16.5ANSI 150483432122225
ANSI 300521451162932
ANSI 600559489203235
ANSI 900610533203538
ANSI 1500673571165154
ISO 7005 (DIN)PN644039512M2022
PN1044540012M2022
PN1646041012M2426
PN2048543212M2426
PN2548543016M2730
PN4051545016M3033
350mm (14") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN1452547012M2426
PN1652547012M2426
PN2155049516M2730
PN3555049516M2730
AS 2129Table C52547012M2426
Table D52547012M2426
Table E52547012M2426
Table F55049516M2730
Table H55049516M2730
Table J55049516M3032
ANSI B16.5ANSI 150533476122529
ANSI 300584514202932
ANSI 600603527203841
ANSI 900641559203841
ANSI 1500749635165760
ISO 7005 (DIN)PN649044512M2022
PN1050546016M2022
PN1652047016M2426
PN2053547612M2735
PN2555549016M3033
PN4058051016M3336
400mm (16") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN1458052112M2426
PN1658052112M2426
PN2161055220M2730
PN3561055220M2730
AS 2129Table C58052112M2426
Table D58052112M2426
Table E58052112M2426
Table F61055220M2730
Table H61055220M2730
Table J61055220M3033
ANSI B16.5ANSI 150597540161" (M24)29
ANSI 300648572201-1/4" (M30)35
ANSI 600686603201-1/2" (M36)41
ANSI 900705616201-5/8" (M42)44
ANSI 1500826705162-1/2" (M64)67
ISO 7005 (DIN)PN654049516M2022
PN1056551516M2426
PN1658052516M2730
PN2060054016M2729.5
PN2562055016M3336
PN4066058516M3639
450mm (18") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14 Flange64058412M2426
PN16 Flange64058412M2426
PN21 Flange67561020M3033
PN35 Flange67561020M3033
AS 2129Table C Flange64058412M2426
Table D Flange64058412M2426
Table E Flange64058416M2426
Table F Flange67561020M3033
Table H Flange67561020M3033
Table J Flange67561020M3336
ANSI B16.5ANSI 150 Flange635578161-1/8" (M27)32
ANSI 300 Flange711629241-1/4" (M30)35
ANSI 600 Flange743654201-5/8" (M42)44
ANSI 900 Flange787686201-7/8" (M48)51
ANSI 1500 Flange914775162-3/4" (M72)73
ISO 7005 (DIN)PN6 Flange59555016M2022
PN10 Flange61556520M2426
PN16 Flange64058520M2730
PN20 Flange63557816M3032.5
PN25 Flange-----
PN40 Flange-----
500mm (20") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN1470564116M2426
PN1670564116M2426
PN2173567324M3033
PN3573567324M3033
AS 2129Table C70564116M2426
Table D70564116M2426
Table E70564116M2426
Table F73567324M3033
Table H73567324M3033
Table J73567324M3336
ANSI B16.5ANSI 150711654201-1/4" (M30)35
ANSI 300775692201-5/8" (M42)44
ANSI 600812727241-7/8" (M48)51
ANSI 900845755242-1/8" (M56)58
ANSI 1500984832203" (M76)79
ISO 7005 (DIN)PN660056020M2022
PN1062057020M2426
PN1671565020M2730
PN2073066020M3032.5
PN2574567020M3336
PN4081073024M3639
600mm (24") Flange Standards
StandardClassDiameterBolt Circle DiameterNumber of BoltsBolt SizeDiameter of Bolt Hole
AS 4087PN14 Flanges82575616M2730
PN16 Flanges82575616M2730
PN21 Flanges85078124M3336
PN35 Flanges75078124M3336
AS 2129Table C Flanges82575616M2730
Table D Flanges82575616M2730
Table E Flanges82575616M3033
Table F Flanges85078124M3336
Table H Flanges85078124M3336
ANSI B16.5ANSI 150 Flanges813749201-1/4" (M30)35
ANSI 300 Flanges914813241-1/2" (M36)41
ANSI 600 Flanges940838241-7/8" (M48)51
ANSI 900 Flanges1041902202-1/2" (M64)67
ANSI 1500 Flanges1168991163-1/2" (M90)92
ISO 7005 (DIN)PN6 Flanges75570520M2426
PN10 Flanges78072520M2730
PN16 Flanges84077020M3336
PN20 Flanges815749.520M3336
PN25 Flanges-----
PN40 Flanges-----

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