Flange Tables

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

13

14

Table D

95

67

4

13

14

Table E

95

67

4

13

14

Table F

95

67

4

13

14

Table H

114

83

4

16

17

Table J

114

83

4

16

17

ANSI B16.5

 

 

 

 

ANSI 150

89

60

4

13

16

ANSI 300

95

67

4

13

16

ANSI 600

95

67

4

13

16

ANSI 900

121

83

4

19

22

ANSI 1500

121

83

4

19

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

13

14

Table D

100

73

4

13

14

Table E

100

73

4

13

14

Table F

100

73

4

13

14

Table H

115

83

4

16

18

Table J

115

83

4

16

18

ANSI B16.5

 

 

 

 

ANSI 150

98

70

4

13

16

ANSI 300

117

83

4

16

19

ANSI 600

117

83

4

16

19

ANSI 900

130

89

4

19

22

ANSI 1500

130

89

4

19

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

13

14

Table D

115

83

4

13

14

Table E

115

83

4

13

14

Table F

120

87

4

16

18

Table H

120

87

4

16

18

Table J

120

87

4

16

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

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

13

14

Table D

120

87

4

13

14

Table E

120

87

4

13

14

Table F

135

98

4

16

18

Table H

135

98

4

16

18

Table J

135

98

4

16

18

ANSI B16.5

 

 

 

 

ANSI 150

117

89

4

13

16

ANSI 300

133

98

4

16

19

ANSI 600

133

98

4

16

19

ANSI 900

159

111

4

22

25

ANSI 1500

159

111

4

22

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

100

4

M16

18

40mm (1 1/2")

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087

PN14

135

98

4

M12

14

AS 2129

 

 

 

 

 

Table C

135

98

4

13

14

Table D

135

98

4

13

14

Table E

135

98

4

13

14

Table F

140

105

4

16

18

Table H

140

105

4

16

18

Table J

140

105

4

16

18

ANSI B16.5

 

 

 

 

ANSI 150

127

98

4

13

16

ANSI 300

156

114

4

19

22

ANSI 600

156

114

4

19

22

ANSI 900

178

124

4

25

29

ANSI 1500

178

124

4

25

29

ISO 7005 (DIN)

 

 

 

 

 

PN6

130

100

4

M12

14

PN10

150

110

4

M16

18

PN16

150

110

4

M16

18

PN20

130

98.5

4

M14

16

PN25

150

110

4

M16

18

PN40

150

110

4

M16

18

 

50mm (2")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 150 114 4 M16 18
PN16 150 114 4 M16 18
PN21 165 127 4 M16 18
PN35 165 127 4 M16 18
AS 2129 Table C 150 114 4 16 18
Table D 150 114 4 16 18
Table E 150 114 4 16 18
Table F 165 127 4 16 18
Table H 165 127 4 16 18
Table J 165 127 4 19 22
ANSI B16.5 ANSI 150 152 121 4 16 19
ANSI 300 165 127 8 16 19
ANSI 600 165 127 8 16 19
ANSI 900 216 165 8 22 25
ANSI 1500 216 165 8 22 25
ISO 7005 (DIN) PN6 140 110 4 M12 14
PN10 165 125 4 M16 18
PN16 165 125 4 M16 18
PN20 150* 120.5 4 M16 18
PN25 165 125 4 M16 18
PN40 165 125 4 M16 18

*When made from cast or ductile iron the OD is 155mm. 

 

65mm (2 1/2")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 165 127 4 M16 18
PN16 165 127 4 M16 18
PN21 185 146 8 M16 18
PN35 185 146 8 M16 18
AS 2129 Table C 165 127 4 16 18
Table D 165 127 4 16 18
Table E 165 127 4 16 18
Table F 185 146 8 16 18
Table H 185 146 8 16 18
Table J 185 146 8 19 22
ANSI B16.5 ANSI 150 178 140 4 16 19
ANSI 300 191 149 8 19 22
ANSI 600 191 149 8 19 22
ANSI 900 244 191 8 22 25
ANSI 1500 244 191 8 25 29
ISO 7005 (DIN) PN6 160 130 4 M12 14
PN10 185 145 4 M16 18
PN16 185 145 4 M16 18
PN20 180 139.5 4 M16 18
PN25 185 145 8 M16 18
PN40 185 145 8 M16 18

 

80mm (3")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 185 146 4 M16 18
PN16 185 146 4 M16 18
PN21 205 165 8 M16 18
PN35 205 165 8 M16 18
AS 2129 Table C 185 146 4 16 18
Table D 185 146 4 16 18
Table E 185 146 4 16 18
Table F 205 165 8 16 18
Table H 205 165 8 16 18
Table J 205 165 8 19 22
ANSI B16.5 ANSI 150 191 152 4 16 19
ANSI 300 210 168 8 19 22
ANSI 600 210 168 8 19 22
ANSI 900 241 192 8 22 25
ANSI 1500 267 203 8 29 32
ISO 7005 (DIN) PN6 190 150 4 M16 18
PN10 200 160 8 M16 18
PN16 200 160 8 M16 18
PN20 190 152.5 4 M16 18
PN25 200 160 8 M16 18
PN40 185 160 8 M16 18

100mm (4")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 215 178 4 M16 18
PN16 215 178 4 M16 18
PN21 230 191 8 M16 18
PN35 230 191 8 M16 18
AS 2129 Table C 215 178 4 16 18
Table D 215 178 4 16 18
Table E 215 178 8 16 18
Table F 230 191 8 16 18
Table H 230 191 8 16 18
Table J 230 191 8 19 22
ANSI B16.5 ANSI 150 229 191 8 16 19
ANSI 300 254 200 8 19 22
ANSI 600 273 216 8 22 25
ANSI 900 292 235 8 29 32
ANSI 1500 311 241 8 32 35
ISO 7005 (DIN) PN6 210 170 4 M16 18
PN10 220 180 8 M16 24
PN16 220 180 8 M16 18
PN20 230 190.5 8 M16 18
PN25 235 190 8 M20 22
PN40 235 190 8 M20 22

125mm (5")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 280 235 8 M16 18
PN16 - - - - -
PN21 - - - - -
PN35 - - - - -
AS 2129 Table C 255 210 8 16 18
Table D 255 210 8 16 18
Table E 255 210 8 16 18
Table F 280 235 8 19 22
Table H 280 235 8 19 22
Table J 280 235 8 22 26
ANSI B16.5 ANSI 150 254 216 8 19 22
ANSI 300 279 235 8 19 22
ANSI 600 330 267 8 25 29
ANSI 900 349 279 8 32 35
ANSI 1500 375 292 8 38 41
ISO 7005 (DIN) PN6 240 200 8 M16 18
PN10 250 210 8 M16 18
PN16 250 210 8 M16 18
PN20 255 216 8 M20 22
PN25 270 220 8 M24 26
PN40 270 220 8 M24 26

150mm (6")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 280 235 8 M16 18
PN16 280 235 8 M16 18
PN21 305 260 12 M20 22
PN35 305 260 12 M20 22
AS 2129 Table C 280 235 8 16 18
Table D 280 235 8 16 18
Table E 280 235 8 19 22
Table F 305 260 12 19 22
Table H 305 260 12 19 22
Table J 305 260 12 22 26
ANSI B16.5 ANSI 150 279 241 8 19 22
ANSI 300 318 270 12 19 22
ANSI 600 356 292 12 25 29
ANSI 900 381 318 12 29 32
ANSI 1500 394 318 12 35 38
ISO 7005 (DIN) PN6 265 225 8 M16 18
PN10 285 240 8 M20 22
PN16 285 240 8 M20 22
PN20 280 241.5 8 M20 22
PN25 300 250 8 M24 26
PN40 300 250 8 M24 26

 

200mm (8")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 335 292 8 M16 18
PN16 335 292 8 M16 18
PN21 370 324 12 M20 22
PN35 370 324 12 M20 22
AS 2129 Table C 335 292 8 16 18
Table D 335 292 8 16 18
Table E 335 292 8 19 22
Table F 370 324 12 19 22
Table H 370 324 12 19 22
Table J 370 324 12 22 26
ANSI B16.5 ANSI 150 343 298 8 19 22
ANSI 300 381 330 12 19 22
ANSI 600 419 349 12 29 32
ANSI 900 470 394 12 35 38
ANSI 1500 483 394 12 41 44
ISO 7005 (DIN) PN6 320 280 8 M16 18
PN10 340 295 8 M20 22
PN16 340 295 12 M20 22
PN20 345 298.5 8 M20 22
PN25 360 310 12 M24 26
PN40 375 320 12 M27 30

250mm (10")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 405 356 8 M20 22
PN16 405 356 8 M20 22
PN21 430 381 12 M24 26
PN35 430 381 12 M24 26
AS 2129 Table C 405 356 8 19 22
Table D 405 356 8 19 22
Table E 405 356 12 19 22
Table F 430 381 12 22 26
Table H 430 381 12 22 26
Table J 430 381 12 25 30
ANSI B16.5 ANSI 150 406 362 12 22 25
ANSI 300 445 387 16 25 29
ANSI 600 508 432 16 32 35
ANSI 900 546 470 16 35 38
ANSI 1500 584 483 12 41 51
ISO 7005 (DIN) PN6 375 335 12 M16 18
PN10 395 350 12 M20 22
PN16 405 355 12 M24 26
PN20 405 362 12 M24 26
PN25 425 370 12 M27 30
PN40 450 385 12 M30 33

 

300mm (12")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 455 406 12 M20 22
PN16 455 406 12 M20 22
PN21 490 438 16 M24 26
PN35 490 438 16 M24 26
AS 2129 Table C 455 406 12 19 22
Table D 455 406 12 19 22
Table E 455 406 12 22 26
Table F 490 438 16 22 26
Table H 490 438 16 22 26
Table J 490 438 16 25 30
ANSI B16.5 ANSI 150 483 432 12 22 25
ANSI 300 521 451 16 29 32
ANSI 600 559 489 20 32 35
ANSI 900 610 533 20 35 38
ANSI 1500 673 571 16 51 54
ISO 7005 (DIN) PN6 440 395 12 M20 22
PN10 445 400 12 M20 22
PN16 460 410 12 M24 26
PN20 485 432 12 M24 26
PN25 485 430 16 M27 30
PN40 515 450 16 M30 33
350mm (14")
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 525 470 12 M24 26
PN16 470 12 M24 M24 26
PN21 495 16 M27 M27 30
PN35 495 16 M27 M27 30
AS 2129 Table C 525 470 12 M24 26
Table D 470 12 22 M24 26
Table E 470 12 22 M24 26
Table F 495 16 25 M27 30
Table H 495 16 25 M27 30
Table J 495 16 29 29 33
ANSI B16.5 ANSI 150 533 476 12 25 29
ANSI 300 514 20 29 29 32
ANSI 600 527 20 38 35 38
ANSI 900 559 20 38 38 41
ANSI 1500 635 16 57 57 60
ISO 7005 (DIN) PN6 490 445 12 M20 22
PN10 460 16 M20 M20 22
PN16 470 16 M24 M24 26
PN20 476 12 M27 M27 29.5
PN25 490 16 M30 M30 32.5
PN40 510 16 M33 M33 35.5


400mm (16")

Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 580 521 12 M24 26
PN16 580 521 12 M24 26
PN21 610 552 20 M27 30
PN35 610 552 20 M27 30
AS 2129 Table C 580 521 12 M24 26
Table D 580 521 12 M24 26
Table E 580 521 12 M24 26
Table F 610 552 20 M27 30
Table H 610 552 20 M27 30
Table J 610 552 20 M27 30
ANSI B16.5 ANSI 150 597 540 16 25 29
ANSI 300 648 572 20 32 35
ANSI 600 686 603 20 38 41
ANSI 900 705 616 20 41 44
ANSI 1500 826 705 16 64 67
ISO 7005 (DIN) PN6 540 495 16 M20 22
PN10 565 515 16 M24 26
PN16 580 525 16 M27 30
PN20 600 540 16 M27 29.5
PN25 620 550 16 M33 36
PN40 660 585 16 M36 39



450mm (18")

Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flange 640 584 12 M24 26
PN16 Flange 640 584 12 M24 26
PN21 Flange 675 610 20 M30 33
PN35 Flange 675 510 20 M30