# 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 for****Pitch 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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