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  Reference Data
   
  FLANGE COMPARISON TABLES
   
  The following tables are based on the British Standards stated. They are intended as a guide and for further details of flange
thickness and pressure/temperature ratings particularly, please refer to the standards.
   
  Flange Dimensions

D : - Flange Diameter
P : - Bolt Hole Pitch Circle Diameter
d : - Bolt Hole Diameter
t : - Flange Thickness Including Raised Face
R : - Raised Face Diameter
f : - Raised Face Height
N : - Number of Bolt Holes

The Flange thickness given is for Carbon Steel Flanges.

Cast Iron Flanges are generally thicker.

   
 

NOTES:

1) Class 125 and class 250 are for cast iron flanges and have the same dimensions as classes 150 and 300 respectively.
2) Abbreviations: FF flat faced, RF raised face, RJ ring joint (facing).
3) BS4504 dimensions are based on mm and converted to the nearest 1/16 in.
ASME B16.5 and BS 10 dimensions are based on inches and converted to mm.

   
  Flange Comparison Tables
   
 
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