Flanges are commonly used to connect valves into pipework making it easier for removal and maintenance. There are many common flange standards and flanges within the same standard can etiher be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel). Below is a reference table for critical flange dimensions to help identify what standard you have.

Flange Dimensions

15mm (1/2")

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087

PN14

95

67

4

M12

14

AS 2129

 

 

 

 

 

Table C

95

67

4

M12

14

Table D

95

67

4

M12

14

Table E

95

67

4

M12

14

Table F

95

67

4

M12

14

Table H

115

83

4

M16

18

Table J

115

83

4

M16

18

ANSI B16.5

 

 

 

 

ANSI 150

89

60

4

1/2" (M14)

16

ANSI 300

95

67

4

1/2" (M14)

16

ANSI 600

95

67

4

1/2" (M14)

16

ANSI 900

121

83

4

3/4" (M20)

22

ANSI 1500

121

83

4

3/4" (M20)

22

ISO 7005 (DIN)

 

 

 

 

 

PN6

80

55

4

M10

11

PN10

95

65

4

M12

14

PN16

95

65

4

M12

14

PN20

90

60.5

4

M14

16

PN25

95

65

4

M12

14

PN40

95

65

4

M12

14

 

 

20mm (3/4")

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087

PN14

100

73

4

M12

14

AS 2129

 

 

 

 

 

Table C

100

73

4

M12

14

Table D

100

73

4

M12

14

Table E

100

73

4

M12

14

Table F

100

73

4

M12

14

Table H

115

83

4

M16

18

Table J

115

83

4

M16

18

ANSI B16.5

 

 

 

 

ANSI 150

98

70

4

1/2" (M14)

16

ANSI 300

117

83

4

5/8" (M16)

19

ANSI 600

117

83

4

5/8" (M16)

19

ANSI 900

130

89

4

3/4" (M20)

22

ANSI 1500

130

89

4

3/4" (M20)

22

ISO 7005 (DIN)

 

 

 

 

 

PN6

90

65

4

M10

11

PN10

105

75

4

M12

14

PN16

105

75

4

M12

14

PN20

100

70

4

M14

16

PN25

105

75

4

M12

14

PN40

105

75

4

M12

14

 

25mm (1")

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087

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

108

79

4

1/2" (M14)

16

ANSI 300

124

89

4

5/8" (M16)

19

ANSI 600

124

89

4

5/8" (M16)

19

ANSI 900

 

102

4

7/8" (M22)

25

ANSI 1500

 

102

4

7/8" (M22)

25

ISO 7005 (DIN)

 

 

 

 

 

PN6

100

78

4

M10

11

PN10

115

85

4

M12

14

PN16

115

85

4

M12

14

PN20

115

85

4

M14

16

PN25

115

85

4

M12

14

PN40

115

85

4

M12

14

32mm (1 1/4")

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087

PN14

120

87

4

M12

14

AS 2129

 

 

 

 

 

Table C

120

87

4

M12

14

Table D

120

87

4

M12

14

Table E

120

87

4

M12

14

Table F

135

98

4

M16

18

Table H

135

98

4

M16

18

Table J

135

98

4

M16

18

ANSI B16.5

 

 

 

 

ANSI 150

117

89

4

1/2" (M14)

16

ANSI 300

133

98

4

5/8" (M16)

19

ANSI 600

133

98

4

5/8" (M16)

19

ANSI 900

159

111

4

7/8" (M22)

25

ANSI 1500

159

111

4

7/8" (M22)

25

ISO 7005 (DIN)

 

 

 

 

 

PN6

120

90

4

M12

14

PN10

140

100

4

M16

18

PN16

140

100

4

M16

18

PN20

120

89

4

M14

16

PN25

140

100

4

M16

18

PN40

140