TYPES OF ASME/ANSI FLANGES

The American National Standards Institute (ANSI) calls for the use of an ANSI flange to be used on specific applications. The ANSI flange is a three-part flange consisting of one flat flange, one flange machined to take a rubber O-ring and the rubber O-ring. The rubber O-ring is placed into the machined groove in one side of the flange and the assembly is tightened against the flat-faced side of the ANSI flange and secured with bolts which are torqued to a specific amount of pressure or tightness. This flange is welded to the ends of pipe to create an easy-to-separate connection. Other variations use a larger flat gasket that fits inside of the bolt circle of the flange.

Forged flange is the best mechanical properties of a flange product, its raw materials are generally tube, and then after cutting and then continue to beat, to eliminate the ingot in the segregation, loose and other defects.

ANSI flange

While not rated for excessive pressure, the ANSI flange is commonly used on pipelines transporting air, water and steam under low to moderate pressure. While some flange types use a gasket that not only covers the flange face, the ANSI flange covers the bolt circle as well. These flange bolts run through the gasket and aid in the aligning of the gasket. The ANSI flange does not use this type of gasket, thus the gasket must be slipped into position after some of the bottom bolts have been put into place. The bolts aid in supporting the gasket that floats in the center of the flange, sealing only the flange opening and creating a leak-proof passage for the pipeline products to pass through when the flange is tightened.

The main types of standard flanges are listed below:
Welding Neck Flanges
WELD NECK FLANGE

A weld neck flange ("WN") has a long tapered hub that can be welded with a pipe or a fitting and is normally used in high pressure and low or high temperatures applications.

BLIND FLANGE

Blind flanges do not have a center hole, differently from all other types of flanges seen above, and are used to seal a pipeline, or a valve / pressure vessel and prevent flow. Blind flanges have to withstand remarkable mechanical stress due to system pressure and bolting.

SLIP ON FLANGE

A slip on flange is connected with pipes or fittings by two fillet welds, inside and outside the flange. The diameter of a slip on flange is larger than the diameter of the connected pipe so it can slide on the pipe to fit it smoothly.

Threaded Flanges, TH Flanges
THREADED FLANGE

Threaded flanges are joined to pipes by screwed connections, generally without welding activities (in certain cases, though, small welds are applied to increase the strenght of the connection).

Socket Welding Flanges, SW Flange
SOCKET WELD FLANGE

Socket weld flanges are connected to pipes using a fillet weld which is executed on the outer of the flange. Socket Weld Flanges are used for small-size and high-pressure piping. Their static strength is equal to slip on flanges, but their fatigue strength is stronger than double-welded slip on flanges.

Lap Joint Flanges
LAP JOINT FLANGE

Lap joint flanges do not have a raised face and are used in conjunction with stub ends .
Lap joint flanges are similar to slip on flanges except for the radius at the crossing of the flange face and the bore to accommodate the flanged portion of the stub end.

Price and mechanical properties are higher than ordinary casting flange a grade. The flange is a part that connects the pipe with the pipe and the valve, is connected to the pipe end. It is also used for the flange on the equipment inlet and outlet.

The lower pressure rating of the ANSI flange allows the gasket to remain floating in the middle of the two flanges instead of being held in place by the flange bolts. Unfortunately, this also creates a seal that, while sufficient for its intended purpose, is prone to leaking or blowing out completely much easier than the larger gaskets that are trapped in place by the flange bolts. The smaller gaskets also require more skill to install as they are not a simple drop-into-position type of gasket.

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087 Flanges

PN14 Flanges

95

67

4

M12

14

AS 2129 Flange

 

 

 

 

 

Table C Flanges

95

67

4

13

14

Table D Flanges

95

67

4

13

14

Table E Flanges

95

67

4

13

14

Table F Flanges

95

67

4

13

14

Table H Flanges

114

83

4

16

17

Table J Flanges

114

83

4

16

17

ANSI B16.5 Flanges

 

 

 

 

ANSI 150 Flanges

89

60

4

13

16

ANSI 300 Flanges

95

67

4

13

16

ANSI 600 Flanges

95

67

4

13

16

ANSI 900 Flanges

121

83

4

19

22

ANSI 1500 Flanges

121

83

4

19

22

ISO 7005 (DIN) Flange

 

 

 

 

 

PN6 Flanges

80

55

4

M10

11

PN10 Flanges

95

65

4

M12

14

PN16 Flanges

95

65

4

M12

14

PN20 Flanges

90

60.5

4

M14

16

PN25 Flanges

95

65

4

M12

14

PN40 Flanges

95

65

4

M12

14

20mm (3/4") Flanges

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087 Flanges

PN14 Flanges

100

73

4

M12

14

AS 2129 Flange

 

 

 

 

 

Table C Flange

100

73

4

13

14

Table D Flange

100

73

4

13

14

Table E Flange

100

73

4

13

14

Table F Flange

100

73

4

13

14

Table H Flange

115

83

4

16

18

Table J Flange

115

83

4

16

18

ANSI B16.5 Flanges

 

 

 

 

ANSI 150 Flange

98

70

4

13

16

ANSI 300 Flange

117

83

4

16

19

ANSI 600 Flange

117

83

4

16

19

ANSI 900 Flange

130

89

4

19

22

ANSI 1500 Flange

130

89

4

19

22

ISO 7005 (DIN) Flange

 

 

 

 

 

PN6 Flange

90

65

4

M10

11

PN10 Flange

105

75

4

M12

14

PN16 Flange

105

75

4

M12

14

PN20 Flange

100

70

4

M14

16

PN25 Flange

105

75

4

M12

14

PN40 Flange

105

75

4

M12

14

25mm (1") Flanges

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087 Flanges

PN14 Flanges

115

83

4

M12

14

AS 2129 Flange

 

 

 

 

 

Table C Flanges

115

83

4

13

14

Table D Flanges

115

83

4

13

14

Table E Flanges

115

83

4

13

14

Table F Flanges

120

87

4

16

18

Table H Flanges

120

87

4

16

18

Table J Flanges

120

87

4

16

18

ANSI B16.5 Flanges

 

 

 

 

ANSI 150 Flanges

110

79

4

13

16

ANSI 300 Flanges

125

89

4

16

19

ANSI 600 Flanges

125

89

4

16

19

ANSI 900 Flanges

 

102

4

22

25

ANSI 1500 Flanges

 

102

4

22

25

ISO 7005 (DIN) Flange

 

 

 

 

 

PN6 Flanges

100

78

4

M10

11

PN10 Flanges

115

85

4

M12

14

PN16 Flanges

115

85

4

M12

14

PN20 Flanges

110

79.5

4

M14

16

PN25 Flanges

115

85

4

M12

14

PN40 Flanges

115

85

4

M12

14

32mm (1 1/4") Flanges

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087 Flanges

PN14 Flanges

120

87

4

M12

14

AS 2129 Flange

 

 

 

 

 

Table C Flange

120

87

4

13

14

Table D Flange

120

87

4

13

14

Table E Flange

120

87

4

13

14

Table F Flange

135

98

4

16

18

Table H Flange

135

98

4

16

18

Table J Flange

135

98

4

16

18

ANSI B16.5 Flanges

 

 

 

 

ANSI 150 Flange

117

89

4

13

16

ANSI 300 Flange

133

98

4

16

19

ANSI 600 Flange

133

98

4

16

19

ANSI 900 Flange

159

111

4

22

25

ANSI 1500 Flange

159

111

4

22

25

ISO 7005 (DIN) Flange

 

 

 

 

 

PN6 Flange

120

90

4

M12

14

PN10 Flange

140

100

4

M16

18

PN16 Flange

140

100

4

M16

18

PN20 Flange

120

89

4

M14

16

PN25 Flange

140

100

4

M16

18

PN40 Flange

140

100

4

M16

18

40mm (1 1/2") Flanges

Standard

Class

Diameter

Bolt Circle Diameter

Number of Bolts

Bolt Size

Diameter of Bolt Hole

AS4087 Flanges

PN14 Flanges

135

98

4

M12

14

AS 2129 Flange

 

 

 

 

 

Table C Flanges

135

98

4

13

14

Table D Flanges

135

98

4

13

14

Table E Flanges

135

98

4

13

14

Table F Flanges

140

105

4

16

18

Table H Flanges

140

105

4

16

18

Table J Flanges

140

105

4

16

18

ANSI B16.5 Flanges

 

 

 

 

ANSI 150 Flanges

127

98

4

13

16

ANSI 300 Flanges

156

114

4

19

22

ANSI 600 Flanges

156

114

4

19

22

ANSI 900 Flanges

178

124

4

25

29

ANSI 1500 Flanges

178

124

4

25

29

ISO 7005 (DIN) Flange

 

 

 

 

 

PN6 Flanges

130

100

4

M12

14

PN10 Flanges

150

110

4

M16

18

PN16 Flanges

150

110

4

M16

18

PN20 Flanges

130

98.5

4

M14

16

PN25 Flanges

150

110

4

M16

18

PN40 Flanges

150

110

4

M16

18

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

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

65mm (2 1/2") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 Flanges PN14 Flanges 165 127 4 M16 18
PN16 Flanges 165 127 4 M16 18
PN21 Flanges 185 146 8 M16 18
PN35 Flanges 185 146 8 M16 18
AS 2129 Flanges Table C Flanges 165 127 4 16 18
Table D Flanges 165 127 4 16 18
Table E Flanges 165 127 4 16 18
Table F Flanges 185 146 8 16 18
Table H Flanges 185 146 8 16 18
Table J Flanges 185 146 8 19 22
ANSI B16.5 Flanges ANSI 150 Flanges 178 140 4 16 19
ANSI 300 Flanges 191 149 8 19 22
ANSI 600 Flanges 191 149 8 19 22
ANSI 900 Flanges 244 191 8 22 25
ANSI 1500 Flanges 244 191 8 25 29
ISO 7005 (DIN) Flanges PN6 Flanges 160 130 4 M12 14
PN10 Flanges 185 145 4 M16 18
PN16 Flanges 185 145 4 M16 18
PN20 Flanges 180 139.5 4 M16 18
PN25 Flanges 185 145 8 M16 18
PN40 Flanges 185 145 8 M16 18
80mm (3") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 Flange PN14 Flange 185 146 4 M16 18
PN16 Flange 185 146 4 M16 18
PN21 Flange 205 165 8 M16 18
PN35 Flange 205 165 8 M16 18
AS 2129 Flange Table C Flange 185 146 4 16 18
Table D Flange 185 146 4 16 18
Table E Flange 165 146 4 16 18
Table F Flange 205 165 8 16 18
Table H Flange 205 165 8 16 18
Table J Flange 205 165 8 19 22
ANSI B16.5 Flange ANSI 150 Flange 191 152 4 16 19
ANSI 300 Flange 210 168 8 19 22
ANSI 600 Flange 210 168 8 19 22
ANSI 900 Flange 241 192 8 22 25
ANSI 1500 Flange 267 203 8 29 32
ISO 7005 (DIN) Flange PN6 Flange 190 150 4 M16 18
PN10 Flange 200 160 8 M16 18
PN16 Flange 200 160 8 M16 18
PN20 Flange 190 152.5 4 M16 18
PN25 Flange 200 160 8 M16 18
PN40 Flange 185 160 8 M16 18
100mm (4") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 Flanges PN14 Flanges 215 178 4 M16 18
PN16 Flanges 215 178 4 M16 18
PN21 Flanges 230 191 8 M16 18
PN35 Flanges 230 191 8 M16 18
AS 2129 Flanges Table C Flanges 215 178 4 16 18
Table D Flanges 215 178 4 16 18
Table E Flanges 215 178 8 16 18
Table F Flanges 230 191 8 16 18
Table H Flanges 230 191 8 16 18
Table J Flanges 230 191 8 19 22
ANSI B16.5 Flanges ANSI 150 Flanges 229 191 8 16 19
ANSI 300 Flanges 254 200 8 19 22
ANSI 600 Flanges 273 216 8 22 25
ANSI 900 Flanges 292 235 8 29 32
ANSI 1500 Flanges 311 241 8 32 35
ISO 7005 (DIN) Flanges PN6 Flanges 210 170 4 M16 18
PN10 Flanges 220 180 8 M16 24
PN16 Flanges 220 180 8 M16 18
PN20 Flanges 230 190.5 8 M16 18
PN25 Flanges 235 190 8 M20 22
PN40 Flanges 235 190 8 M20 22
125mm (5") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 Flanges PN14 Flanges 280 235 8 M16 18
PN16 Flanges - - - - -
PN21 Flanges - - - - -
PN35 Flanges - - - - -
AS 2129 Flanges Table C Flanges 255 210 8 16 18
Table D Flanges 255 210 8 16 18
Table E Flanges 255 210 8 16 18
Table F Flanges 280 235 8 19 22
Table H Flanges 280 235 8 19 22
Table J Flanges 280 235 8 22 26
ANSI B16.5 Flanges ANSI 150 Flanges 254 216 8 19 22
ANSI 300 Flanges 279 235 8 19 22
ANSI 600 Flanges 330 267 8 25 29
ANSI 900 Flanges 349 279 8 32 35
ANSI 1500 Flanges 375 292 8 38 41
ISO 7005 (DIN) Flanges PN6 Flanges 240 200 8 M16 18
PN10 Flanges 250 210 8 M16 18
PN16 Flanges 250 210 8 M16 18
PN20 Flanges 255 216 8 M20 22
PN25 Flanges 270 220 8 M24 26
PN40 Flanges 270 220 8 M24 26

150mm (6") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flanges 280 235 8 M16 18
PN16 Flanges 280 235 8 M16 18
PN21 Flanges 305 260 12 M20 22
PN35 Flanges 305 260 12 M20 22
AS 2129 Table C Flanges 280 235 8 16 18
Table D Flanges 280 235 8 16 18
Table E Flanges 280 235 8 19 22
Table F Flanges 305 260 12 19 22
Table H Flanges 305 260 12 19 22
Table J Flanges 305 260 12 22 26
ANSI B16.5 ANSI 150 Flanges 279 241 8 19 22
ANSI 300 Flanges 318 270 12 19 22
ANSI 600 Flanges 356 292 12 25 29
ANSI 900 Flanges 381 318 12 29 32
ANSI 1500 Flanges 394 318 12 35 38
ISO 7005 (DIN) PN6 Flanges 265 225 8 M16 18
PN10 Flanges 285 240 8 M20 22
PN16 Flanges 285 240 8 M20 22
PN20 Flanges 280 241.5 8 M20 22
PN25 Flanges 300 250 8 M24 26
PN40 Flanges 300 250 8 M24 26
200mm (8") flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flange 335 292 8 M16 18
PN16 Flange 335 292 8 M16 18
PN21 Flange 370 324 12 M20 22
PN35 Flange 370 324 12 M20 22
AS 2129 Table C Flange 335 292 8 16 18
Table D Flange 335 292 8 16 18
Table E Flange 335 292 8 19 22
Table F Flange 370 324 12 19 22
Table H Flange 370 324 12 19 22
Table J Flange 370 324 12 22 26
ANSI B16.5 ANSI 150 Flange 343 298 8 19 22
ANSI 300 Flange 381 330 12 19 22
ANSI 600 Flange 419 349 12 29 32
ANSI 900 Flange 470 394 12 35 38
ANSI 1500 Flange 483 394 12 41 44
ISO 7005 (DIN) PN6 Flange 320 280 8 M16 18
PN10 Flange 340 295 8 M20 22
PN16 Flange 340 295 12 M20 22
PN20 Flange 345 298.5 8 M20 22
PN25 Flange 360 310 12 M24 26
PN40 Flange 375 320 12 M27 30
250mm (10") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flange 405 356 8 M20 22
PN16 Flange 405 356 8 M20 22
PN21 Flange 430 381 12 M24 26
PN35 Flange 430 381 12 M24 26
AS 2129 Table C Flange 405 356 8 19 22
Table D Flange 405 356 8 19 22
Table E Flange 405 356 12 19 22
Table F Flange 430 381 12 22 26
Table H Flange 430 381 12 22 26
Table J Flange 430 381 12 25 30
ANSI B16.5 ANSI 150 Flange 406 362 12 22 25
ANSI 300 Flange 445 387 16 25 29
ANSI 600 Flange 508 432 16 32 35
ANSI 900 Flange 546 470 16 35 38
ANSI 1500 Flange 584 483 12 41 51
ISO 7005 (DIN) PN6 Flange 375 335 12 M16 18
PN10 Flange 395 350 12 M20 22
PN16 Flange 405 355 12 M24 26
PN20 Flange 405 362 12 M24 26
PN25 Flange 425 370 12 M27 30
PN40 Flange 450 385 12 M30 33
300mm (12") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flanges 455 406 12 M20 22
PN16 Flanges 455 406 12 M20 22
PN21 Flanges 490 438 16 M24 26
PN35 Flanges 490 438 16 M24 26
AS 2129 Table C Flanges 455 406 12 19 22
Table D Flanges 455 406 12 19 22
Table E Flanges 455 406 12 22 26
Table F Flanges 490 438 16 22 26
Table H Flanges 490 438 16 22 26
Table J Flanges 490 438 16 25 30
ANSI B16.5 ANSI 150 Flanges 483 432 12 22 25
ANSI 300 Flanges 521 451 16 29 32
ANSI 600 Flanges 559 489 20 32 35
ANSI 900 Flanges 610 533 20 35 38
ANSI 1500 Flanges 673 571 16 51 54
ISO 7005 (DIN) PN6 Flanges 440 395 12 M20 22
PN10 Flanges 445 400 12 M20 22
PN16 Flanges 460 410 12 M24 26
PN20 Flanges 485 432 12 M24 26
PN25 Flanges 485 430 16 M27 30
PN40 Flanges 515 450 16 M30 33
350mm (14") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flanges 525 470 12 M24 26
PN16 Flanges 525 470 12 M24 26
PN21 Flanges 550 495 16 M27 30
PN35 Flanges 550 495 16 M27 30
AS 2129 Table C Flanges 525 470 12 22 26
Table D Flanges 525 470 12 22 26
Table E Flanges 525 470 12 22 26
Table F Flanges 550 495 16 25 30
Table H Flanges 550 495 16 25 30
Table J Flanges 550 495 16 29 32
ANSI B16.5 ANSI 150 Flanges 533 476 12 25 29
ANSI 300 Flanges 584 514 20 29 32
ANSI 600 Flanges 603 527 20 38 41
ANSI 900 Flanges 641 559 20 38 41
ANSI 1500 Flanges 749 635 16 57 60
ISO 7005 (DIN) PN6 Flanges 490 445 12 M20 22
PN10 Flanges 505 460 16 M20 22
PN16 Flanges 520 470 16 M24 26
PN20 Flanges 535 476 12 M27 35
PN25 Flanges 555 490 16 M30 33
PN40 Flanges 580 510 16 M33 36
400mm (16") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flange 580 521 12 M24 26
PN16 Flange 580 521 12 M24 26
PN21 Flange 610 552 20 M27 30
PN35 Flange 610 552 20 M27 30
AS 2129 Table C Flange 580 521 12 22 26
Table D Flange 580 521 12 22 26
Table E Flange 580 521 12 22 26
Table F Flange 610 552 20 25 30
Table H Flange 610 552 20 25 30
Table J Flange 610 552 20 29 33
ANSI B16.5 ANSI 150 Flange 597 540 16 25 29
ANSI 300 Flange 648 572 20 32 35
ANSI 600 Flange 686 603 20 38 41
ANSI 900 Flange 705 616 20 41 44
ANSI 1500 Flange 826 705 16 64 67
ISO 7005 (DIN) PN6 Flange 540 495 16 M20 22
PN10 Flange 565 515 16 M24 26
PN16 Flange 580 525 16 M27 30
PN20 Flange 600 540 16 M27 29.5
PN25 Flange 620 550 16 M33 36
PN40 Flange 660 585 16 M36 39
450mm (18") Flanges
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 33
AS 2129 Table C Flange 640 584 12 22 26
Table D Flange 640 584 12 22 26
Table E Flange 640 584 16 22 26
Table F Flange 675 610 20 29 33
Table H Flange 675 610 20 29 33
Table J Flange 675 610 20 32 35
ANSI B16.5 ANSI 150 Flange 635 578 16 29 32
ANSI 300 Flange 711 629 24 32 35
ANSI 600 Flange 743 654 20 41 44
ANSI 900 Flange 787 686 20 48 51
ANSI 1500 Flange 914 775 16 70 73
ISO 7005 (DIN) PN6 Flange 595 550 16 M20 22
PN10 Flange 615 565 20 M24 26
PN16 Flange 640 585 20 M27 30
PN20 Flange 635 578 16 M30 32.5
PN25 Flange - - - - -
PN40 Flange - - - - -
500mm (20") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flange 705 641 16 M24 26
PN16 Flange 705 641 16 M24 26
PN21 Flange 735 673 24 M30 33
PN35 Flange 735 673 24 M30 33
AS 2129 Table C Flange 705 641 16 22 26
Table D Flange 705 641 16 22 26
Table E Flange 705 641 16 22 26
Table F Flange 735 673 24 29 33
Table H Flange 735 673 24 29 33
Table J Flange 735 673 24 32 36
ANSI B16.5 ANSI 150 Flange 699 635 20 29 32
ANSI 300 Flange 775 686 24 32 35
ANSI 600 Flange 813 724 24 41 44
ANSI 900 Flange 857 749 20 51 54
ANSI 1500 Flange 984 832 16 76 79
ISO 7005 (DIN) PN6 Flange 645 600 20 M20 22
PN10 Flange 670 620 20 M24 26
PN16 Flange 715 650 20 M30 33
PN20 Flange 700 635 20 M30 32.5
PN25 Flange - - - - -
PN40 Flange - - - - -
600mm (24") Flanges
Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS 4087 PN14 Flanges 825 756 16 M27 30
PN16 Flanges 825 756 16 M27 30
PN21 Flanges 850 781 24 M33 36
PN35 Flanges 750 781 24 M33 36
AS 2129 Table C Flanges 825 756 16 25 30
Table D Flanges 825 756 16 25 30
Table E Flanges 825 756 16 29 33
Table F Flanges 850 781 24 32 36
Table H Flanges 850 781 24 32 36
Table J Flanges 850 781 24 35 39
ANSI B16.5 ANSI 150 Flanges 813 749 20 32 35
ANSI 300 Flanges 914 813 24 38 41
ANSI 600 Flanges 940 838 24 48 51
ANSI 900 Flanges 1041 902 20 64 67
ANSI 1500 Flanges 1168 991 16 89 92
ISO 7005 (DIN) PN6 Flanges 755 705 20 M24 26
PN10 Flanges 780 725 20 M27 30
PN16 Flanges 840 770 20 M33 36
PN20 Flanges 815 749.5 20 M33 36
PN25 Flanges - - - - -
PN40 Flanges - - - - -

The majority of problems with an ANSI flange originate at the time of assembly. Some installers use a screwdriver to push the gasket into position while tightening the flange bolts. This can create a small nick that ultimately develops into a crack over time. Other problems that contribute to defects in sealing are getting grease on the gasket, trapping debris between the flanges and improperly lining up gaskets at the time of installation.



About Sunny Steel

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

Link exchange

Copyright © 2011 Sunny Steel Enterprise Ltd.  All Rights Reserved ICP No.:08010763