How to Calculate PCD of Flange?

How to Find PCD (Pitch Circle Diameter) of Four,Five, Six Hole Flange?

Pitch Circle Diameter of Flange Calculation

PCD is called as Pitch Circle Diameter. PCD of a flange is one of the critical dimensions, usually measured in millimeters. It is the diameter of the circle that passes through every bolt holes. It is usually used to measure the distance between the two opposite holes. PCD of a flange can be calculated from 4 holes or Stud.

Let us learn how to calculate PCD of 4, 5 and 6 hole flange.

Formula forPitch Circle Diameter of a Flange:
For 4 Hole Flange = s / 0.7071
For 5 Hole Flange = s / 0. 5878
For 6 Hole Flange = s / 0.5
Where,
s = Measurement of Flange

Step 1: Consider a 100mm flange, with 6 holes. Find the PCD of the flange.
Given Data :
s - 100 mm
Holes - 6

Step 2: Substitute the values in the formula
Pitch Circle Diameter of 6 Hole Flange = s / 0.5
= 100 /0.5
=200
PCD of Flange = 200mm

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