Please find following some details of flanges dimensions. Whenever ordering a valve always ensure where appropriate that it fits into the pipework as required. This will often mean having to specify the valve face-to face dimension, & what flange drilling is required.
 

Face-to-faces can vary massively depending on the valves make, type, pattern, figure, pressure rating and so forth. Flange dimensions however should usually fall into one of the 3 following categories:- Imperial, Metric, or ANSI. Somewhat unsurprisingly, imperial flanges are more common on older valves, whereas metric are more prelevant amongst newer valves. The ANSI flanges are an American standard, more common in chemical & petro-chemical industries.
 

Please note that the following tables are meant to be used for indication purposes only, & Whittle Valves accepts no responsibility from any accidental errors included.
 

Finally should you require any details relating to less common flanges sizes / ratings, ie. 7" flanges, or in excess of 12", then please do not hesitate to contact Whittle Valves.

 

1/2" or 15mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 3 3/4" 3 3/4" 3 3/4" 4 1/2" 4 1/2" 80mm 95mm 95mm 95mm 95mm 3 1/2" 3 3/4" 3 3/4"
Bolt Circle Dia. 2 5/8" 2 5/8" 2 5/8" 3 1/4" 3 1/4" 55mm 65mm 65mm 65mm 65mm 2 3/8" 2 5/8" 2 5/8"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 1/2" 1/2" 1/2" 5/8" 5/8" M10 M12 M12 M12 M12 1/2" 1/2" 1/2"

 

3/4" or 20mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 4" 4" 4" 4 1/2" 4 1/2" 90mm 105mm 105mm 105mm 105mm 3 7/8" 4 5/8" 4 5/8"
Bolt Circle Dia. 2 7/8" 2 7/8" 2 7/8" 3 1/4" 3 1/4" 65mm 75mm 75mm 75mm 75mm 2 3/4" 3 1/4" 3 1/4"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 1/2" 1/2" 1/2" 5/8" 5/8" M10 M12 M12 M12 M12 1/2" 5/8" 5/8"

 

1" or 25mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 4 1/2" 4 1/2" 4 3/4" 4 3/4" 4 3/4" 100mm 115mm 115mm 115mm 115mm 4 1/4" 4 7/8" 4 7/8"
Bolt Circle Dia. 3 1/4" 3 1/4" 3 7/16" 3 7/16" 3 7/16" 75mm 85mm 85mm 85mm 85mm 3 1/8" 3 1/2" 3 1/2"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 1/2" 1/2" 5/8" 5/8" 5/8" M10 M12 M12 M12 M12 1/2" 5/8" 5/8"

 

11/4" or 32mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 4 3/4" 4 3/4" 5 1/4" 5 1/4" 5 1/4" 120mm 140mm 140mm 140mm 140mm 4 5/8" 5 1/4" 5 1/4"
Bolt Circle Dia. 3 7/16" 3 7/16" 3 7/8" 3 7/8" 3 7/8" 90mm 100mm 100mm 100mm 100mm 3 1/2" 3 7/8" 3 7/8"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 1/2" 1/2" 5/8" 5/8" 5/8" M12 M16 M16 M16 M16 1/2" 5/8" 5/8"

 

11/2" or 40mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 5 1/4" 5 1/4" 5 1/2" 5 1/2" 5 1/2" 130mm 150mm 150mm 150mm 150mm 5" 6 1/8" 6 1/8"
Bolt Circle Dia. 3 7/8" 3 7/8" 4 1/8" 4 1/8" 4 1/8" 100mm 110mm 110mm 110mm 110mm 3 7/8" 4 1/2" 4 1/2"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 1/2" 1/2" 5/8" 5/8" 5/8" M12 M16 M16 M16 M16 1/2" 3/4" 3/4"

 

2" or 50mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 6" 6" 6 1/2" 6 1/2" 6 1/2" 140mm 165mm 165mm 165mm 165mm 6" 6 1/2" 6 1/2"
Bolt Circle Dia. 4 1/2" 4 1/2" 5" 5" 5" 110mm 125mm 125mm 125mm 125mm 4 3/4" 5" 5"
No. of Bolts 4 4 4 4 4 4 4 4 4 4 4 4 4
Size of Bolts 5/8" 5/8" 5/8" 5/8" 3/4" M12 M16 M16 M16 M16 5/8" 5/8" 5/8"

 

2 1/2" or 65mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 6 1/2" 6 1/2" 7 1/4" 7 1/4" 7 1/4" 160mm 185mm 185mm 185mm 185mm 7" 7 1/2" 7 1/2"
Bolt Circle Dia. 5" 5" 5 3/4" 5 3/4" 5 3/4" 130mm 145mm 145mm 145mm 145mm 5 1/2" 5 7/8" 5 7/8"
No. of Bolts 4 4 8 8 8 4 4 4 8 8 4 8 8
Size of Bolts 5/8" 5/8" 5/8" 5/8" 3/4" M12 M16 M16 M16 M16 5/8" 3/4" 3/4"

 

3" or 80mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 7 1/4" 7 1/4" 8" 8" 8" 190mm 200mm 200mm 200mm 200mm 7 1/2" 8 1/4" 8 1/4"
Bolt Circle Dia. 5 3/4" 5 3/4" 6 1/2" 6 1/2" 6 1/2" 150mm 160mm 160mm 160mm 160mm 6" 6 5/8" 6 5/8"
No. of Bolts 4 4 8 8 8 4 8 8 8 8 4 8 8
Size of Bolts 5/8" 5/8" 5/8" 5/8" 3/4" M12 M16 M16 M16 M16 5/8" 3/4" 3/4"

 

4" or 100mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 8 1/2" 8 1/2" 9" 9" 9" 210mm 220mm 220mm 235mm 235mm 9" 10" 10 3/4"
Bolt Circle Dia. 7" 7" 7 1/2" 7 1/2" 7 1/2" 170mm 180mm 180mm 190mm 190mm 7 1/2" 7 7/8" 8 1/2"
No. of Bolts 4 8 8 8 8 4 8 8 8 8 8 8 8
Size of Bolts 5/8" 5/8" 5/8" 5/8" 3/4" M12 M16 M16 M16 M20 5/8" 3/4" 7/8"

 

5" or 125mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 10" 10" 11" 11" 11" 240mm 250mm 250mm 270mm 270mm 10" 11" 13"
Bolt Circle Dia. 8 1/4" 8 1/4" 9 1/4" 9 1/4" 9 1/4" 200mm 210mm 210mm 220mm 220mm 8 1/2" 9 1/4" 10 1/2"
No. of Bolts 8 8 8 8 8 8 8 8 8 8 8 8 8
Size of Bolts 5/8" 5/8" 3/4" 3/4" 7/8" M16 M16 M16 M24 M24 3/4" 3/4" 1"

 

6" or 150mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 10" 10" 11" 11" 11" 240mm 250mm 250mm 270mm 270mm 10" 11" 13"
Bolt Circle Dia. 8 1/4" 8 1/4" 9 1/4" 9 1/4" 9 1/4" 200mm 210mm 210mm 220mm 220mm 8 1/2" 9 1/4" 10 1/2"
No. of Bolts 8 8 8 8 8 8 8 8 8 8 8 8 8
Size of Bolts 5/8" 5/8" 3/4" 3/4" 7/8" M16 M16 M16 M24 M24 3/4" 3/4" 1"

 

8" or 200mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 13 1/4" 13 1/4" 14 1/2" 14 1/2" 14 1/2" 320mm 340mm 340mm 360mm 375mm 13 1/2" 15" 16 1/2"
Bolt Circle Dia. 11 1/2" 11 1/2" 12 3/4" 12 3/4" 12 3/4" 280mm 295mm 295mm 310mm 320mm 11 3/4" 13" 13 3/4"
No. of Bolts 8 8 12 12 12 8 8 12 12 12 8 12 12
Size of Bolts 5/8" 3/4" 3/4" 3/4" 7/8" M16 M20 M20 M24 M27 3/4" 7/8" 1 1/8"

 

10" or 250mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 16" 16" 17" 17" 17" 375mm 395mm 405mm 425mm 450mm 16" 17 1/2" 20"
Bolt Circle Dia. 14" 14" 15" 15" 15" 335mm 350mm 355mm 370mm 385mm 14 1/4" 15 1/4" 17"
No. of Bolts 8 12 12 12 12 12 12 12 12 12 12 16 16
Size of Bolts 3/4" 3/4" 7/8" 7/8" 1" M16 M20 M24 M27 M30 7/8" 1" 1 1/4"

 

12" or 350mm Flanges

 

  IMPERIAL METRIC ANSI
  Bst D Bst E Bst F Bst H Bst J PN 6 PN 10 PN 16 PN 25 PN 40 150 300 600
Flange O.D. 18" 18" 19 1/4" 19 1/4" 19 1/4" 440mm 445mm 460mm 485mm 515mm 19" 20 1/2" 22"
Bolt Circle Dia. 16" 16" 17 1/4" 17 1/4" 17 1/4" 395mm 400mm 410mm 430mm 450mm 17" 17 3/4" 19 1/4"
No. of Bolts 12 12 16 16 16 12 12 12 16 16 12 16 20
Size of Bolts 3/4" 7/8" 7/8" 7/8" 1" M20 M20 M24 M27 M30 7/8" 1 1/8" 1 1/4"