Flange

Flanges are widely used to connect valves to pipework, allowing easier removal and maintenance. Several flange standards exist, and within the same standard, flanges may be flat-faced (typically cast iron or ductile iron) or raised-face (commonly cast steel or stainless steel). The table below provides key flange dimensions to help you identify the applicable standard.

Flange Tables

Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN1495674M1214
AS 2129Table C95674M1214
AS 2129Table D95674M1214
AS 2129Table E95674M1214
AS 2129Table F95674M1214
AS 2129Table H114834M1617
AS 2129Table J114834M1617
ANSI B16.5ANSI 150896041316
ANSI B16.5ANSI 300956741316
ANSI B16.5ANSI 600956741316
ANSI B16.5ANSI 9001218341922
ANSI B16.5ANSI 15001218341922
ISO 7005 (DIN)PN680554M1011
ISO 7005 (DIN)PN1095654M1214
ISO 7005 (DIN)PN1695654M1214
ISO 7005 (DIN)PN209060.54M1416
ISO 7005 (DIN)PN2595654M1214
ISO 7005 (DIN)PN4095654M1214
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14100734M1214
AS 2129Table C100734M1214
AS 2129Table D100734M1214
AS 2129Table E100734M1214
AS 2129Table F100734M1214
AS 2129Table H115834M1218
AS 2129Table J115834M1218
ANSI B16.5ANSI 150987041316
ANSI B16.5ANSI 3001178341619
ANSI B16.5ANSI 6001178341619
ANSI B16.5ANSI 9001308941922
ANSI B16.5ANSI 15001308941922
ISO 7005 (DIN)PN690654M1011
ISO 7005 (DIN)PN10105754M1214
ISO 7005 (DIN)PN16105754M1214
ISO 7005 (DIN)PN20100704M1416
ISO 7005 (DIN)PN25105754M1214
ISO 7005 (DIN)PN40105754M1214
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087 PN14 115 83 4 M12 14
AS 2129 Table C 115 83 4 M12 14
Table D 115 83 4 M12 14
Table E 115 83 4 M12 14
Table F 120 87 4 M16 18
Table H 120 87 4 M16 18
Table J 120 87 4 M16 18
ANSI B16.5 ANSI 150 110 79 4 13 16
ANSI 300 125 89 4 16 19
ANSI 600 125 89 4 16 19
ANSI 900 102 4 22 25
ANSI 1500 102 4 22 25
ISO 7005 (DIN) PN6 100 78 4 M10 11
PN10 115 85 4 M12 14
PN16 115 85 4 M12 14
PN20 110 79.5 4 M14 16
PN25 115 85 4 M12 14
PN40 115 85 4 M12 14
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14120874M1214
AS 2129Table C120874M1214
AS 2129Table D120874M1214
AS 2129Table E120874M1214
AS 2129Table F135984M1618
AS 2129Table H135984M1618
AS 2129Table J135984M1618
ANSI B16.5ANSI 1501178941316
ANSI B16.5ANSI 3001339841619
ANSI B16.5ANSI 6001339841619
ANSI B16.5ANSI 90015911142225
ANSI B16.5ANSI 150015911142225
ISO 7005 (DIN)PN6120904M1214
ISO 7005 (DIN)PN101401004M1618
ISO 7005 (DIN)PN161401004M1618
ISO 7005 (DIN)PN20120894M1416
ISO 7005 (DIN)PN251401004M1618
ISO 7005 (DIN)PN401401004M1618
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14135984M1214
AS 2129Table C135984M1214
AS 2129Table D135984M1214
AS 2129Table E135984M1214
AS 2129Table F1401054M1618
AS 2129Table H1401054M1618
AS 2129Table J1401054M1618
ANSI B16.5ANSI 1501279841316
ANSI B16.5ANSI 30015611441922
ANSI B16.5ANSI 60015611441922
ANSI B16.5ANSI 90017812442529
ANSI B16.5ANSI 150017812442529
ISO 7005 (DIN)PN61301004M1214
ISO 7005 (DIN)PN101501104M1618
ISO 7005 (DIN)PN161501104M1618
ISO 7005 (DIN)PN2013098.54M1416
ISO 7005 (DIN)PN251501104M1618
ISO 7005 (DIN)PN401501104M1618
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN141501144M1618
AS 4087PN161501144M1618
AS 4087PN211651274M1618
AS 4087PN351651274M1618
AS 2129Table C1501144M1618
AS 2129Table D1501144M1618
AS 2129Table E1501144M1618
AS 2129Table F1651274M1618
AS 2129Table H1651274M1618
AS 2129Table J1651274M2022
ANSI B16.5ANSI 15015212141619
ANSI B16.5ANSI 30016512781619
ANSI B16.5ANSI 60016512781619
ANSI B16.5ANSI 90021616582225
ANSI B16.5ANSI 150021616582225
ISO 7005 (DIN)PN61401104M1214
ISO 7005 (DIN)PN101651254M1618
ISO 7005 (DIN)PN161651254M1618
ISO 7005 (DIN)PN20150*120.54M1618
ISO 7005 (DIN)PN251651254M1618
ISO 7005 (DIN)PN401651254M1618
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN141651274M1618
AS 4087PN161651274M1618
AS 4087PN211851468M1618
AS 4087PN351851468M1618
AS 2129Table C1651274M1618
AS 2129Table D1651274M1618
AS 2129Table E1651274M1618
AS 2129Table F1851468M1618
AS 2129Table H1851468M1618
AS 2129Table J1851468M2022
ANSI B16.5ANSI 15017814041619
ANSI B16.5ANSI 30019114981922
ANSI B16.5ANSI 60019114981922
ANSI B16.5ANSI 90024419182225
ANSI B16.5ANSI 150024419182529
ISO 7005 (DIN)PN61601304M1214
ISO 7005 (DIN)PN101851454M1618
ISO 7005 (DIN)PN161851454M1618
ISO 7005 (DIN)PN20180139.54M1618
ISO 7005 (DIN)PN251851458M1618
ISO 7005 (DIN)PN401851458M1618
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN141851464M1618
AS 4087PN161851464M1618
AS 4087PN212051658M1618
AS 4087PN352051658M1618
AS 2129Table C1851464M1618
AS 2129Table D1851464M1618
AS 2129Table E1851464M1618
AS 2129Table F2051658M1618
AS 2129Table H2051658M1618
AS 2129Table J2051658M2022
ANSI B16.5ANSI 15019115241619
ANSI B16.5ANSI 30021016881922
ANSI B16.5ANSI 60021016881922
ANSI B16.5ANSI 90024119282225
ANSI B16.5ANSI 150026720382932
ISO 7005 (DIN)PN61901504M1618
ISO 7005 (DIN)PN102001608M1618
ISO 7005 (DIN)PN162001608M1618
ISO 7005 (DIN)PN20190152.54M1618
ISO 7005 (DIN)PN252001608M1618
ISO 7005 (DIN)PN402001608M1618
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN142151784M1618
AS 4087PN162151784M1618
AS 4087PN212301918M1618
AS 4087PN352301918M1618
AS 2129Table C2151784M1618
AS 2129Table D2151784M1618
AS 2129Table E2151788M1618
AS 2129Table F2301918M1618
AS 2129Table H2301918M1618
AS 2129Table J2301918M2022
ANSI B16.5ANSI 15022919181619
ANSI B16.5ANSI 30025420081922
ANSI B16.5ANSI 60027321682225
ANSI B16.5ANSI 90029223582932
ANSI B16.5ANSI 150031124183235
ISO 7005 (DIN)PN62101704M1618
ISO 7005 (DIN)PN102201808M1624
ISO 7005 (DIN)PN162201808M1618
ISO 7005 (DIN)PN20230190.58M1618
ISO 7005 (DIN)PN252351908M2022
ISO 7005 (DIN)PN402351908M2022
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN142552108M1618
AS 4087PN162552108M1618
AS 4087PN212802358M2022
AS 4087PN352802358M2022
AS 2129Table C2552108M1618
AS 2129Table D2552108M1618
AS 2129Table E2552108M1618
AS 2129Table F2802358M2022
AS 2129Table H2802358M2022
AS 2129Table J2802358M2426
ANSI B16.5ANSI 15025421681922
ANSI B16.5ANSI 30027923581922
ANSI B16.5ANSI 60033026782529
ANSI B16.5ANSI 90034927983235
ANSI B16.5ANSI 150037529283841
ISO 7005 (DIN)PN62402008M1618
ISO 7005 (DIN)PN102502108M1618
ISO 7005 (DIN)PN162502108M1618
ISO 7005 (DIN)PN202552168M2022
ISO 7005 (DIN)PN252702208M2426
ISO 7005 (DIN)PN402702208M2426
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN142802358M1618
AS 4087PN162802358M1618
AS 4087PN2130526012M2022
AS 4087PN3530526012M2022
AS 2129Table C2802358M1618
AS 2129Table D2802358M1618
AS 2129Table E2802358M2022
AS 2129Table F30526012M2022
AS 2129Table H30526012M2022
AS 2129Table J30526012M2426
ANSI B16.5ANSI 15027924181922
ANSI B16.5ANSI 300318270121922
ANSI B16.5ANSI 600356292122529
ANSI B16.5ANSI 900381318122932
ANSI B16.5ANSI 1500394318123538
ISO 7005 (DIN)PN62652258M1618
ISO 7005 (DIN)PN102852408M2022
ISO 7005 (DIN)PN162852408M2022
ISO 7005 (DIN)PN20280241.58M2022
ISO 7005 (DIN)PN253002508M2426
ISO 7005 (DIN)PN403002508M2426
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14335 2928M16 18
AS 4087PN16335 2928M16 18
AS 4087PN21370 32412M20 22
AS 4087PN35370 32412M20 22
AS 2129Table C335 2928M16 18
AS 2129Table D335 2928M16 18
AS 2129Table E335 2928M20 22
AS 2129Table F370 32412M20 22
AS 2129Table H370 32412M20 22
AS 2129Table J370 32412M24 26
ANSI B16.5ANSI 150343 298819 22
ANSI B16.5ANSI 300381 3301219 22
ANSI B16.5ANSI 600419 3491229 32
ANSI B16.5ANSI 900470 3941235 38
ANSI B16.5ANSI 1500483 3941241 44
ISO 7005 (DIN)PN6320 2808M16 18
ISO 7005 (DIN)PN10340 2958M20 22
ISO 7005 (DIN)PN16340 29512M20 22
ISO 7005 (DIN)PN20345 298.58M20 22
ISO 7005 (DIN)PN25360 31012M24 26
ISO 7005 (DIN)PN40375 32012M27 30
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14405 3568M20 22
AS 4087PN16405 3568M20 22
AS 4087PN21430 38112M24 26
AS 4087PN35430 38112M24 26
AS 2129Table C405 3568M20 22
AS 2129Table D405 3568M20 22
AS 2129Table E405 35612M20 22
AS 2129Table F430 38112M24 26
AS 2129Table H430 38112M24 26
AS 2129Table J430 38112M27 30
ANSI B16.5ANSI 150406 3621222 25
ANSI B16.5ANSI 300445 3871625 29
ANSI B16.5ANSI 600508 4321632 35
ANSI B16.5ANSI 900546 4701635 38
ANSI B16.5ANSI 1500584 4831241 51
ISO 7005 (DIN)PN6375 33512M16 18
ISO 7005 (DIN)PN10395 35012M20 22
ISO 7005 (DIN)PN16405 35512M24 26
ISO 7005 (DIN)PN20405 36212M24 26
ISO 7005 (DIN)PN25425 37012M27 30
ISO 7005 (DIN)PN40450 38512M30 33
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14455 40612M20 22
AS 4087PN16455 40612M20 22
AS 4087PN21490 43816M24 26
AS 4087PN35490 43816M24 26
AS 2129Table C455 40612M20 22
AS 2129Table D455 40612M20 22
AS 2129Table E455 40612M24 26
AS 2129Table F490 43816M24 26
AS 2129Table H490 43816M24 26
AS 2129Table J490 43816M27 30
ANSI B16.5ANSI 150483 4321222 25
ANSI B16.5ANSI 300521 4511629 32
ANSI B16.5ANSI 600559 4892032 35
ANSI B16.5ANSI 900610 5332035 38
ANSI B16.5ANSI 1500673 5711651 54
ISO 7005 (DIN)PN6440 39512M20 22
ISO 7005 (DIN)PN10445 40012M20 22
ISO 7005 (DIN)PN16460 41012M24 26
ISO 7005 (DIN)PN20485 43212M24 26
ISO 7005 (DIN)PN25485 43016M27 30
ISO 7005 (DIN)PN40515 45016M30 33
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087PN14525 47012M24 26
AS 4087PN16525 47012M24 26
AS 4087PN21550 49516M27 30
AS 4087PN35550 49516M27 30
AS 2129Table C525 47012M24 26
AS 2129Table D525 47012M24 26
AS 2129Table E525 47012M24 26
AS 2129Table F550 49516M27 30
AS 2129Table H550 49516M27 30
AS 2129Table J550 49516M30 32
ANSI B16.5ANSI 150533 4761225 29
ANSI B16.5ANSI 300584 5142029 32
ANSI B16.5ANSI 600603 5272038 41
ANSI B16.5ANSI 900641 5592038 41
ANSI B16.5ANSI 1500749 6351657 60
ISO 7005 (DIN)PN6490 44512M20 22
ISO 7005 (DIN)PN10505 46016M20 22
ISO 7005 (DIN)PN16520 47016M24 26
ISO 7005 (DIN)PN20535 47612M27 35
ISO 7005 (DIN)PN25555 49016M30 33
ISO 7005 (DIN)PN40580 51016M33 36
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087 PN14 580 521 12 M24 26
AS 4087 PN16 580 521 12 M24 26
AS 4087 PN21 610 552 20 M27 30
AS 4087 PN35 610 552 20 M27 30
AS 2129 Table C 580 521 12 M24 26
AS 2129 Table D 580 521 12 M24 26
AS 2129 Table E 580 521 12 M24 26
AS 2129 Table F 610 552 20 M27 30
AS 2129 Table H 610 552 20 M27 30
AS 2129 Table J 610 552 20 M30 33
ANSI B16.5 ANSI 150 597 540 16 1" (M24) 29
ANSI B16.5 ANSI 300 648 572 20 1-1/4" (M30) 35
ANSI B16.5 ANSI 600 686 603 20 1-1/2" (M36) 41
ANSI B16.5 ANSI 900 705 616 20 1-5/8" (M42) 44
ANSI B16.5 ANSI 1500 826 705 16 2-1/2" (M64) 67
ISO 7005 (DIN) PN6 540 495 16 M20 22
ISO 7005 (DIN) PN10 565 515 16 M24 26
ISO 7005 (DIN) PN16 580 525 16 M27 30
ISO 7005 (DIN) PN20 600 540 16 M27 29.5
ISO 7005 (DIN) PN25 620 550 16 M33 36
ISO 7005 (DIN) PN40 660 585 16 M36 39
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087 PN14 Flange 640 584 12 M24 26
AS 4087 PN16 Flange 640 584 12 M24 26
AS 4087 PN21 Flange 675 610 20 M30 33
AS 4087 PN35 Flange 675 510 20 M30 33
AS 2129 Table C Flange 640 584 12 M24 26
AS 2129 Table D Flange 640 584 12 M24 26
AS 2129 Table E Flange 640 584 16 M24 26
AS 2129 Table F Flange 675 610 20 M30 33
AS 2129 Table H Flange 675 610 20 M30 33
AS 2129 Table J Flange 675 610 20 M33 36
ANSI B16.5 ANSI 150 Flange 635 578 16 1-1/8" (M27) 32
ANSI B16.5 ANSI 300 Flange 711 629 24 1-1/4" (M30) 35
ANSI B16.5 ANSI 600 Flange 743 654 20 1-5/8" (M42) 44
ANSI B16.5 ANSI 900 Flange 787 686 20 1-7/8" (M48) 51
ANSI B16.5 ANSI 1500 Flange 914 775 16 2-3/4" (M72) 73
ISO 7005 (DIN) PN6 Flange 595 550 16 M20 22
ISO 7005 (DIN) PN10 Flange 615 565 20 M24 26
ISO 7005 (DIN) PN16 Flange 640 585 20 M27 30
ISO 7005 (DIN) PN20 Flange 635 578 16 M30 32.5
ISO 7005 (DIN) PN25 Flange - - - - -
ISO 7005 (DIN) PN40 Flange - - - - -
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087 PN14 Flange 705 641 16 M24 26
AS 4087 PN16 Flange 705 641 16 M24 26
AS 4087 PN21 Flange 735 673 24 M30 33
AS 4087 PN35 Flange 735 673 24 M30 33
AS 2129 Table C Flange 705 641 16 M24 26
AS 2129 Table D Flange 705 641 16 M24 26
AS 2129 Table E Flange 705 641 16 M24 26
AS 2129 Table F Flange 735 673 24 M30 33
AS 2129 Table H Flange 735 673 24 M30 33
AS 2129 Table J Flange 735 673 24 M33 36
ANSI B16.5 ANSI 150 Flange 699 635 20 1-1/8" (M27) 32
ANSI B16.5 ANSI 300 Flange 775 686 24 1-1/4" (M30) 35
ANSI B16.5 ANSI 600 Flange 813 724 24 1-5/8" (M42) 44
ANSI B16.5 ANSI 900 Flange 857 749 20 2" (M48) 54
ANSI B16.5 ANSI 1500 Flange 984 832 16 3" (M80) 79
ISO 7005 (DIN) PN6 Flange 645 600 20 M20 22
ISO 7005 (DIN) PN10 Flange 670 620 20 M24 26
ISO 7005 (DIN) PN16 Flange 715 650 20 M30 33
ISO 7005 (DIN) PN20 Flange 700 635 20 M30 32.5
ISO 7005 (DIN) PN25 Flange - - - - -
ISO 7005 (DIN) PN40 Flange - - - - -
Standard Class Diameter (mm) Bolt Circle Diameter (mm) Number of Bolts Bolt Size Diameter of Bolt Hole (mm)
AS 4087 PN14 Flanges 825 756 16 M27 30
AS 4087 PN16 Flanges 825 756 16 M27 30
AS 4087 PN21 Flanges 850 781 24 M33 36
AS 4087 PN35 Flanges 750 781 24 M33 36
AS 2129 Table C Flanges 825 756 16 M27 30
AS 2129 Table D Flanges 825 756 16 M27 30
AS 2129 Table E Flanges 825 756 16 M30 33
AS 2129 Table F Flanges 850 781 24 M33 36
AS 2129 Table H Flanges 850 781 24 M33 36
AS 2129 Table J Flanges 850 781 24 M36 39
ANSI B16.5 ANSI 150 Flanges 813 749 20 1-1/4" (M30) 35
ANSI B16.5 ANSI 300 Flanges 914 813 24 1-1/2" (M36) 41
ANSI B16.5 ANSI 600 Flanges 940 838 24 1-7/8" (M48) 51
ANSI B16.5 ANSI 900 Flanges 1041 902 20 2-1/2" (M64) 67
ANSI B16.5 ANSI 1500 Flanges 1168 991 16 3-1/2" (M90) 92
ISO 7005 (DIN) PN6 Flanges 755 705 20 M24 26
ISO 7005 (DIN) PN10 Flanges 780 725 20 M27 30
ISO 7005 (DIN) PN16 Flanges 840 770 20 M33 36
ISO 7005 (DIN) PN20 Flanges 815 749.5 20 M33 36
ISO 7005 (DIN) PN25 Flanges - - - - -
ISO 7005 (DIN) PN40 Flanges - - - - -
Stainless steel flanges round
Stainless steel flanges
Scroll to Top