The PCD of a flange is one of the critical dimensions.
PCD is called as Pitch Circle Diameter and usually measured in millimeters. It is usually used to measure the distance between the two opposite holes. If there are certain number of holes are in a circle and divided equally then we say the diameter of the circle as pitch circle diameter.
How to Calculate the PCD of Flange ?
Here are the Formulas to Calculate the PCD of Flange according to there Holes
No. of holes in the Pitch Circle 
Diagram 
Formula 
3
holes 

a
= pcd x 0.866 
4 holes 

a = pcd x 0.7071 
5
holes 

a
= pcd x 0.5878 
6
holes 

a
= pcd x 0.5 
7
holes 

a
= pcd x 0.4339 
8
holes 

a
= pcd x 0.3827 
9
holes 

a = pcd x 0.342 
10 holes 

a
= pcd x 0.309 
For Example :
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