Flange comparison Guide - James J. Doherty Ltd.

ENGINEERS'PROVIDERS EST.1909

Servicing the Engineering Industry Since 1909

Tel: 046 9558050 sales@jamesjdoherty.ie jamesjdoherty.ie

Flange comparison Guide

Select Size Below for comparison

?"

DN15

3"

DN80

14"

?"

DN20

4"

DN100

15"

1"

DN25

5"

DN125

16"

1?"

DN32

6"

DN150

18"

1?"

DN40

8"

DN200

20"

2"

DN50

10"

DN250

24"

2?"

DN65

12"

DN300

DN350 DN375 DN400 DN450 DN500 DN600

What is DN? DN stands for 'Diameter Nominale'. Put simply, it is a rough translation of mm from imperial sizes, assuming that an inch is 25mm. We refer to a 12" flange as DN300, when in fact it is 304mm.

What is the PCD?

The PCD of a flange is one of the critical dimensions.

PCD (Pitch Circle Diameter) is the diameter of a circle that goes through

each of the bolt holes.

There are several standards for flanges, and we deal with four of them;

Table D

Table E

British

Standard - BS10

Table F Table G Table H

Table E is the most popular for applications with water. All dimensions are specified in inches.

Table J

Table K

Table C

Australia n Standard - AS2129

Table D Table E Table F Table G Table H

These flanges are equivalent to the BS10 flanges, except that

all dimensions are specified in mm. In some sizes, bolt holes are slightly larger to give better clearance.

Table J

American

National Standard

s Institute (ANSI)

ANSI 125 ANSI 150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500

Higher numbers denote higher pressures. Sometimes people

use the word 'Class' instead of ANSI. e.g. an ANSI 150 flange might be called a 'Class 150'. All dimensions are specified in

inches.

BS4504-6 PN6

British Standard

- BS4504

BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64

PN10 PN16 PN25 PN40 PN64

Engineers use the prefix PN (Pressure Nominale). e.g. a BA4504-16 flange will commonly be referred to as a PN16. Generally, a PN16 flange is designed to withstand pressures up

to 16 bar. All dimensions are specified in mm.

BS4504-100 PN100

Size = DN15

Table

ANSI 125/150 ANSI 600 ANSI 900 ANSI 1500 AS2129 Table C AS2129 Table D AS2129 Table E AS2129 Table F AS2129 Table H AS2129 Table J BS10 Table D BS10 Table E BS10 Table F BS10 Table H BS10 Table J BS10 Table K BS4504-6 BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64 BS4504-100

Flange

Diameter 3 1/2" / 89mm 3 3/4" / 95mm 4 3/4" / 121mm 4 3/4" / 121mm

95mm 95mm 95mm 95mm 14mm 114mm 3 3/4" / 95mm 3 3/4" / 95mm 3 3/4" / 95mm 4 1/2" / 114mm 4 1/2" / 114mm 4 1/2" / 114mm 80mm 95mm 95mm 95mm 95mm 105mm 105mm

PCD

2 3/8" / 60mm 2 5/8" / 67mm 3 1/4" / 83mm 3 1/4" / 83mm

67mm 67mm 67mm 67mm 83mm 83mm 2 5/8" / 67mm 2 5/8" / 67mm 2 5/8" / 67mm 3 1/4" / 83mm 3 1/4" / 83mm 3 1/4" / 83mm 55mm 65mm 65mm 65mm 65mm 75mm 75mm

Bolts

4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

Bolt Size 1/2" 1/2" 3/4" 3/4"

m m m m m m 1/2" 1/2" 1/2" 5/8" 5/8" 5/8" M10 M12 M12 M12 M12 M12 M12

Hole Size

5/8" / 16mm 5/8" / 16mm 7/8" / 22mm 7/8" / 22mm

14mm 14mm 14mm 14mm 17mm 17mm 9/16" / 14mm 9/16" / 14mm 9/16" / 14mm 11/16" / 17mm 11/16" / 17mm 11/16" / 17mm 11mm 14mm 14mm 14mm 14mm 14mm 14mm

Grey Cast Iron

13mm 13mm 13mm 13mm 16mm

1/2" / 13mm 1/2" / 13mm 1/2" / 13mm 5/8" / 16mm

12mm 14mm 14mm 16mm

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Thickness

Copper Alloy

5/16" / 8mm

13mm 6mm 6mm 8mm 10mm 16mm 1/4" / 6mm 1/4" / 6mm 5/16" / 8mm 3/8" / 10mm 5/8" / 16mm 3/4" / 19mm

Cast / Forged Steel

5/16" / 8mm 9/16" / 14mm 7/8" / 22mm 7/8" / 22mm

10mm 10mm 10mm 10mm 13mm 16mm 3/8" / 10mm 3/8" / 10mm 3/8" / 10mm 1/2" / 13mm 5/8" / 16mm 3/4" / 19mm

8mm 9mm

16mm 16mm 20mm 20mm

Size = DN20

Table

ANSI 125/150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500 AS2129 Table C AS2129 Table D AS2129 Table E AS2129 Table F AS2129 Table H AS2129 Table J BS10 Table D BS10 Table E BS10 Table F BS10 Table H BS10 Table J BS10 Table K BS4504-6 BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64 BS4504-100

Flange

Diameter 3 7/8" / 98mm 4 5/8" / 117mm 4 5/8" / 117mm 5 1/8" / 130mm 5 1/8" / 130mm

100mm 100mm 100mm 100mm 115mm 115mm 4" / 102mm 4" / 102mm 4" / 102mm 4 1/2" / 114mm 4 1/2" / 114mm 4 1/2" / 114mm 90mm 105mm 105mm 105mm 105mm 130mm 130mm

PCD

2 3/4" / 70mm 3 1/4" / 83mm 3 1/4" / 83mm 3 1/2" / 89mm 3 1/2" / 89mm

73mm 73mm 73mm 73mm 83mm 83mm 2 7/8" / 73mm 2 7/8" / 73mm 2 7/8" / 73mm 3 1/4" / 83mm 3 1/4" / 83mm 3 1/4" / 83mm 65mm 75mm 75mm 75mm 75mm 90mm 90mm

Bolts

4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

Bolt Size 1/2" 5/8" 5/8" 3/4" 3/4"

m m m m m m 1/2" 1/2" 1/2" 5/8" 5/8" 5/8" M10 M12 M12 M12 M12 M16 M16

Hole Size

5/8" / 16mm 3/4" / 19mm 3/4" / 19mm 7/8" / 22mm 7/8" / 22mm

14mm 14mm 14mm 14mm 18mm 18mm 9/16" / 14mm 9/16" / 14mm 9/16" / 14mm 11/16" / 17mm 11/16" / 17mm 11/16" / 17mm 11mm 14mm 14mm 14mm 14mm 18mm 18mm

Grey Cast Iron

13mm 13mm 13mm 13mm 16mm

1/2" / 13mm 1/2" / 13mm 1/2" / 13mm 5/8" / 16mm

14mm 16mm 16mm 18mm

Return To Index Page

Thickness

Copper Alloy

11/32" / 9mm 17/32" / 13mm

13mm 6mm 6mm 8mm 10mm 16mm 1/4" / 6mm 1/4" / 6mm 5/16" / 8mm 3/8" / 10mm 5/8" / 16mm 3/4" / 19mm

Cast / Forged Steel

9/16" / 14mm 5/8" / 16mm 5/8" / 16mm 1" / 25mm 1" / 25mm

10mm 10mm 10mm 10mm 13mm 16mm 3/8" / 10mm 3/8" / 10mm 3/8" / 10mm 1/2" / 13mm 5/8" / 16mm 3/4" / 19mm

6mm 8mm 9mm

18mm 18mm 18mm 22mm 22mm

Size = DN25

Table

ANSI 125/150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500 AS2129 Table C AS2129 Table D AS2129 Table E AS2129 Table F AS2129 Table H AS2129 Table J BS10 Table D BS10 Table E BS10 Table F BS10 Table H BS10 Table J BS10 Table K BS4504-6 BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64 BS4504-100

Return To Index Page

Flange

Diameter 4 1/4" / 108mm 4 7/8" / 124mm 4 7/8" / 124mm 5 7/8" / 149mm 5 7/8" / 149mm

115mm 115mm 115mm 120mm 120mm 120mm 4 1/2" / 114mm 4 1/2" / 114mm 4 3/4" / 121mm 4 3/4" / 121mm 4 3/4" / 121mm 5" / 127mm 100mm 115mm 115mm 115mm 115mm 140mm 140mm

PCD

3 1/8" / 79mm 3 1/2" / 89mm 3 1/2" / 89mm

4" / 102mm 4" / 102mm

83mm 83mm 83mm 87mm 87mm 87mm 3 1/4" / 83mm 3 1/4" / 83mm 3 7/16" / 87mm 3 7/16" / 87mm 3 7/16" / 87mm 3 3/4" / 95mm 75mm 85mm 85mm 85mm 85mm 100mm 100mm

Bolts

4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

Bolt Size 1/2" 5/8" 5/8" 7/8" 7/8"

m m m m m m 1/2" 1/2" 5/8" 5/8" 5/8" 5/8" M10 M12 M12 M12 M12 M16 M16

Hole Size

5/8" / 16mm 3/4" / 19mm 3/4" / 19mm

1" / 25mm 1" / 25mm

14mm 14mm 14mm 18mm 18mm 18mm 9/16" / 14mm 9/16" / 14mm 9/16" / 14mm 11/16" / 17mm 11/16" / 17mm 11/16" / 17mm 11mm 14mm 14mm 14mm 14mm 18mm 18mm

Grey Cast Iron

7/16" / 11mm

13mm 13mm 13mm 13mm 19mm

1/2" / 13mm 1/2" / 13mm 1/2" / 13mm 3/4" / 19mm

14mm 16mm 16mm 18mm

Thickness

Copper Alloy

3/8" / 10mm 19/32" / 15mm

13mm 8mm 8mm 10mm 11mm 19mm 5/16" / 8mm 5/16" / 8mm 3/8" / 10mm 7/16" / 11mm 3/4" / 19mm 7/8" / 22mm

Cast / Forged Steel

7/16" / 11mm 11/16" / 17mm 11/16" / 17mm 1 1/8" / 29mm 1 1/8" / 29mm

10mm 10mm 10mm 10mm 14mm 19mm 3/8" / 10mm 3/8" / 10mm 3/8" / 10mm 9/16" / 14mm 3/4" / 19mm 7/8" / 22mm

8mm 9mm 11mm

18mm 18mm 18mm 24mm 24mm

Size = DN32

Table

ANSI 125/150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500 AS2129 Table C AS2129 Table D AS2129 Table E AS2129 Table F AS2129 Table H AS2129 Table J BS10 Table D BS10 Table E BS10 Table F BS10 Table H BS10 Table J BS10 Table K BS4504-6 BS4504-10 BS4504-16 BS4504-25 BS4504-40 BS4504-64 BS4504-100

Flange

Diameter 4 5/8" / 117mm 5 1/4" / 133mm 5 1/4" / 133mm 6 1/4" / 159mm 6 1/4" / 159mm

120mm 120mm 120mm 135mm 135mm 135mm 4 3/4" / 121mm 4 3/4" / 121mm 5 1/4" / 133mm 5 1/4" / 133mm 5 1/4" / 133mm 5 1/4" / 133mm 120mm 140mm 140mm 140mm 140mm 155mm 155mm

PCD

3 1/2" / 89mm 3 7/8" / 98mm 3 7/8" / 98mm 4 3/8" / 111mm 4 3/8" / 111mm

87mm 87mm 87mm 98mm 98mm 98mm 3 7/16" / 87mm 3 7/16" / 87mm 3 7/8" / 98mm 3 7/8" / 98mm 3 7/8" / 98mm 3 7/8" / 98mm 90mm 100mm 100mm 100mm 100mm 110mm 110mm

Bolts

4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

Bolt Size 1/2" 5/8" 5/8" 7/8" 7/8"

m m m m m m 1/2" 1/2" 5/8" 5/8" 5/8" 5/8" M12 M16 M16 M16 M16 M20 M20

Hole Size

5/8" / 16mm 3/4" / 19mm 3/4" / 19mm 1" / 25mm 1" / 25mm

14mm 14mm 14mm 18mm 18mm 18mm 9/16" / 14mm 9/16" / 14mm 11/16" / 17mm 11/16" / 17mm 11/16" / 17mm 11/16" / 17mm 14mm 18mm 18mm 18mm 18mm 22mm 22mm

Grey Cast Iron

1/2" / 13mm

16mm 16mm 16mm 16mm 22mm

5/8" / 16mm 5/8" / 16mm 5/8" / 16mm 7/8" / 22mm

16mm 18mm 18mm 20mm

Return To Index Page

Thickness

Copper Alloy

13/32" / 10mm 5/8" / 16mm

16mm 8mm 8mm 10mm 11mm 19mm 5/16" / 8mm 5/16" / 8mm 3/8" / 10mm 7/16" / 11mm 3/4" / 19mm 7/8" / 22mm

Cast / Forged Steel

1/2" / 13mm 3/4" / 19mm 13/16" / 21mm 1 1/8" / 29mm 1 1/8" / 29mm

13mm 13mm 13mm 13mm 17mm 19mm 1/2" / 13mm 1/2" / 13mm 1/2" / 13mm 11/16" / 17mm 3/4" / 19mm 7/8" / 22mm

8mm 9mm 11mm

18mm 18mm 18mm 26mm 26mm

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