Flange Tables

Flanges are commonly used to connect valves into pipework making it easier for removal and maintenance.

Standards of flanges vary worldwide, meaning that in most cases they are not interchangeable. The size, drilling and pressure range will be different (ie a PN16 flange is not rated to the same pressure class as a PN40 flange...nor would a PN16 flange fit an ANSI 150 flange).

To make the selection process easy we use flange tables which show the most common standards used worldwide. These include: ANSI / ASME (USA), PN / DIN (European), BS10, Table E, Table D, Table F (British), and JIS/KS (Japanese/Korean).

Below are flange tables for critical flange dimensions to help identify what standard you have.


1/2" NB (DN15) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 80mm 12mm 55mm 4 M10 / 45
PN10 95mm 14mm 65mm 4 M12 / 50
PN16 95mm 14mm 65mm 4 M12 / 50
PN25 95mm 16mm 65mm 4 M12 / 55
PN40 95mm 16mm 65mm 4 M12 / 55
PN64 105mm 20mm 75mm 4 M12 / 70
Table D 3.3/4" 3/16" 2.5/8" 4 M12 / 25
Table E 3.3/4" 1/4" 2.5/8" 4 M12 / 30
Table F 3.3/4" 3/8" 2.5/8" 4 M12 / 40
Table H 4.1/2" 1/2" 3.1/4" 4 M16 / 50
ANSI 150 3.1/2" 7/16" 2.3/8" 4 M12 / 45
ANSI 300 3.3/4" 9/16" 2.5/8" 4 M12 / 50

3/4" NB (DN20) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 90mm 14mm 65mm 4 M10 / 50
PN10 105mm 16mm 75mm 4 M12 / 55
PN16 105mm 16mm 75mm 4 M12 / 55
PN25 105mm 16mm 75mm 4 M12 / 55
PN40 105mm 18mm 75mm 4 M12 / 55
PN64 130mm 22mm 90mm 4 M16 / 70
Table D 4" 3/16" 2.7/8" 4 M12 / 25
Table E 4" 1/4" 2.7/8" 4 M12 / 30
Table F 4" 3/8" 2.7/8" 4 M12 / 40
Table H 4.1/2" 1/2" 3.1/4" 4 M16 / 50
ANSI 150 3.7/8" 1/2" 2.3/4" 4 M12 / 50
ANSI 300 4.5/8" 5/8" 3.1/2" 4 M12 / 55

1" NB (DN25) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 100mm 14mm 75mm 4 M10 / 50
PN10 115mm 16mm 85mm 4 M12 / 55
PN16 115mm 16mm 85mm 4 M12 / 55
PN25 115mm 18mm 85mm 4 M12 / 65
PN40 115mm 18mm 85mm 4 M12 / 65
PN64 140mm 24mm 100mm 4 M16 / 75
Table D 4.1/2" 3/16" 3.1/4" 4 M12 / 25
Table E 4.1/2" 9/32" 3.1/4" 4 M12 / 30
Table F 4.3/4" 3/8" 3.7/16" 4 M16 / 45
Table H 4.3/4" 9/16" 3.7/16" 4 M16 / 50
ANSI 150 4.1/4" 9/16" 3.1/8" 4 M12 / 50
ANSI 300 4.7/8" 11/16" 3.1/2" 4 M16 / 65

1 1/4" NB (DN32) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 120mm 16mm 90mm 4 M12 / 55
PN10 140mm 16mm 100mm 4 M16 / 55
PN16 140mm 16mm 100mm 4 M16 / 55
PN25 140mm 18mm 100mm 4 M16 / 55
PN40 140mm 18mm 100mm 4 M16 / 65
PN64 155mm 24mm 110mm 4 M20 / 75
Table D 4.3/4" 1/4" 3.7/16" 4 M12 / 30
Table E 4.3/4" 5/16" 3.7/16" 4 M12 / 40
Table F 5.1/4" 1/2" 3.7/8" 4 M16 / 45
Table H 5.1/4" 11/16" 3.7/8" 4 M16 / 55
ANSI 150 4.5/8" 5/8" 2.3/8" 4 M12 / 55
ANSI 300 5.1/4" 3/4" 3.7/8" 4 M12 / 70

1 1/2" NB (DN40) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 130mm 16mm 100mm 4 M12 / 55
PN10 150mm 16mm 110mm 4 M16 / 55
PN16 150mm 16mm 110mm 4 M16 / 55
PN25 150mm 20mm 110mm 4 M16 / 70
PN40 150mm 20mm 110mm 4 M16 / 70
PN64 170mm 26mm 125mm 4 M20 / 80
Table D 5.1/4" 1/4" 3.7/8" 4 M12 / 30
Table E 5.1/4" 11/32" 3.7/8" 4 M12 / 40
Table F 5.1/2" 1/2" 4.1/8" 4 M16 / 55
Table H 5.1/2" 11/16" 4.1/8" 4 M16 / 55
ANSI 150 5" 11/16" 2.7/8" 4 M12 / 55
ANSI 300 6.1/8" 13/16" 4.1/2" 4 M16 / 75

2" NB (DN50) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 140mm 16mm 110mm 4 M12 / 55
PN10 165mm 18mm 125mm 4 M16 / 65
PN16 165mm 18mm 125mm 4 M16 / 65
PN25 165mm 20mm 125mm 4 M16 / 70
PN40 165mm 20mm 125mm 4 M16 / 70
PN64 180mm 26mm 135mm 4 M20 / 80
Table D 6" 5/16" 4.1/2" 4 M16 / 40
Table E 6" 3/8" 4.1/2" 4 M16 / 45
Table F 6.1/2" 5/8" 5" 4 M16 / 55
Table H 6.1/2" 3/4" 5" 4 M16 / 55
ANSI 150 6" 3/4" 4.3/4" 4 M16 / 70
ANSI 300 6.1/2" 7/8" 5" 8 M16 / 75

2 1/2" NB (DN65) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 160mm 16mm 130mm 4 M12 / 65
PN10 185mm 18mm 145mm 4 M16 / 65
PN16 185mm 18mm 145mm 4 M16 / 65
PN25 185mm 22mm 145mm 8 M16 / 70
PN40 185mm 22mm 145mm 8 M16 / 70
PN64 205mm 26mm 160mm 8 M20 / 80
Table D 6.1/2" 5/16" 5" 4 M16 / 40
Table E 6.1/2" 13/32" 5" 4 M16 / 45
Table F 7.1/4" 5/8" 5.3/4" 8 M16 / 55
Table H 7.1/4" 3/4" 5.3/4" 8 M16 / 55
ANSI 150 7" 7/8" 5.1/2" 4 M16 / 70
ANSI 300 7.1/2" 1" 5.7/8" 8 M20 / 75

3" NB (DN80) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 190mm 18mm 150mm 4 M16 / 65
PN10 200mm 20mm 160mm 8 M16 / 70
PN16 200mm 20mm 160mm 8 M16 / 70
PN25 200mm 24mm 160mm 8 M16 / 75
PN40 200mm 24mm 160mm 8 M16 / 75
PN64 215mm 30mm 170mm 8 M20 / 90
Table D 7.1/4" 3/4" 5.3/4" 4 M16 / 45
Table E 7.1/4" 7/16" 5.3/4" 4 M16 / 45
Table F 8" 5/8" 6.1/2" 8 M16 / 55
Table H 8" 7/8" 6.1/2" 8 M16 / 70
ANSI 150 7.1/2" 1/16" 6" 4 M16 / 75
ANSI 300 7.1/4" 1.1/8" 6.5/8" 8 M20 / 90

4" NB (DN100) Flange Table 

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 210mm 18mm 170mm 4 M16 / 65
PN10 220mm 20mm 180mm 8 M16 / 70
PN16 220mm 20mm 180mm 8 M16 / 70
PN25 235mm 26mm 190mm 8 M20 / 80
PN40 235mm 26mm 190mm 8 M20 / 80
PN64 250mm 32mm 200mm 8 M24 / 90
Table D 8.1/2" 3/8" 7" 4 M16 / 45
Table E 8.1/2" 1/2" 7" 8 M16 / 50
Table F 9" 3/4" 7.1/2" 8 M26 / 65
Table H 9" 1" 7.1/2" 8 M26 / 75
ANSI 150 9" 15/16" 7.1/2" 8 M16 / 75
ANSI 300 10" 1.1/4" 7.7/8" 8 M20 / 95

5" NB (DN125) Flange Table 

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 265mm 20mm 225mm 8 M16 / 70
PN10 285mm 22mm 240mm 8 M20 / 70
PN16 285mm 22mm 240mm 8 M20 / 70
PN25 300mm 28mm 250mm 8 M24 / 80
PN40 300mm 30mm 250mm 8 M24 / 90
PN64 345mm 36mm 280mm 8 M30 / 105
Table D 11" 1/2" 9.1/4" 8 M16 / 50
Table E 11" 11/16" 9.1/4" 8 M20 / 65
Table F 12" 7/8" 10.1/4" 12 M20 / 70
Table H 12" 1.1/8" 10.1/4" 8 M20 / 80
ANSI 150 11" 1" 9.1/2" 8 M20 / 80
ANSI 300 12.1/2" 1.7/16" 10.5/8" 8 M20 / 105

6" NB (DN150) Flange Table 

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 240mm 20mm 200mm 8 M16 / 70
PN10 250mm 22mm 210mm 8 M16 / 70
PN16 250mm 22mm 210mm 8 M16 / 70
PN25 270mm 28mm 220mm 8 M24 / 80
PN40 270mm 28mm 220mm 8 M24 / 80
PN64 295mm 34mm 240mm 8 M27 / 100
Table D 10" 1/2" 8.1/4" 8 M16 / 50
Table E 10" 9/16" 8.1/4" 8 M16 / 50
Table F 11" 7/8" 9.1/4" 8 M20 / 70
Table H 11" 1.1/8" 9.1/4" 8 M20 / 80
ANSI 150 10" 15/16" 8.1/2" 8 M20 / 80
ANSI 300 11" 1.3/8" 9.1/4" 9 M20 / 100

8" NB (DN200) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 320mm 22mm 280mm 8 M16 / 70
PN10 340mm 24mm 295mm 8 M20 / 75
PN16 340mm 24mm 295mm 12 M20 / 75
PN25 360mm 30mm 310mm 12 M24 / 90
PN40 375mm 34mm 320mm 12 M27 / 90
PN64 415mm 46mm 345mm 12 M33 / 130
Table D 13.1/4" 1/2" 11.1/2" 8 M16 / 50
Table E 13.3/4" 9/16" 11.1/2" 8 M20 / 65
Table F 14.1/2" 7/8" 12.3/4" 12 M20 / 75
Table H 14.1/2" 1.1/8" 12.3/8" 12 M20 / 90
ANSI 150 13.1/2" 15/16" 11.3/4" 8 M20 / 90
ANSI 300 15" 1.3/8" 13" 12 M22 / 105

10" NB (DN250) Flange Table 

Flange Dimensions

Type: Diameter  Thickness PCD No. of holes Diameter / Bolt Length
PN6 375mm 24mm 335mm 12 M16 / 70
PN10 395mm 26mm 350mm 12 M20 / 80
PN16 405mm 26mm 355mm 12 M24 / 80
PN25 425mm 38mm 370mm 12 M24 / 90
PN40 450mm 42mm 385mm 12 M30 / 120
PN64 470mm 54mm 400mm 12 M33 / 150
Table D 16" 5/8" 14" 8 M20 / 55
Table E 16" 7/8" 14" 12 M20 / 70
Table F 17" 1.1/8" 15" 12 M22 / 80
Table H 17" 1.3/8" 15" 12 M22 / 100
ANSI 150 16" 1.3/16" 14.1/4" 12 M22 / 95
ANSI 300 12.1/2" 1.7/16" 10.5/8" 16 M20 / 105

12" NB (DN300) Flange Table

Flange Dimensions

Type: Diameter Thickness PCD No. of holes Diameter / Bolt Length
PN6 440mm 24mm 395mm 12 M20 / 70
PN10 445mm 26mm 400mm 12 M20 / 80
PN16 460mm 26mm 410mm 12 M24 / 80
PN25 485mm 40mm 430mm 16 M27 / 110
PN40 515mm 50mm 450mm 16 M30 / 140
PN64 530mm 62mm 460mm 16 M33 / 160
Table D 18" 5/8" 16" 12 M20 / 65
Table E 18" 7/8" 16" 12 M22 / 80
Table F 19.1/4" 1.1/8" 17.1/4" 16 M22 / 90
Table H 19.1/4" 1.3/8" 17.1/4" 16 M22 / 105
ANSI 150 19" 1.3/16" 17" 12 M22 / 100
ANSI 300 20.1/2" 1.7/16" 17.3/4" 16 M28 / 130

Please note

Information is subject to alteration and should be used as reference only. Valves Online accept no responsibility for any inaccuracies that occur. For special applications or conditions please click here to contact us using our online form.