Dimensions of PN Flanges - Steel PN25

PN40, PN25 & PN16

 
This diagram illustrated the arrangement but not necessarily the correct number of bolt holes.
Refer to the column 'Bolting number' in the table for the actual number.
For raised face diameter and different types of flange faces see: Dimensions of PN Flange Faces - Steel
 
Dimensions of PN25 Flanges
 
Nominal
Size

DN

 Mating
Dimensions		  
Outside
Diameter
D [mm]		 Diameter of
Bolt Circle
K [mm]		 Diameter of
Bolt Hole
L    [mm]		 Bolting
Number		 Bolting
Size		 Flange
Thickness
C [mm]
15 to 150 see PN40 Dimensions
200 360 310 26 12 M24 30
250 425 370 30 12 M27 32
300 485 430 30 16 M27 34
350 555 490 33 16 M30 38
400 620 550 36 16 M33 40