How to Find PCD (Pitch Circle Diameter) of Four,Five, Six Hole Flange?
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
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
PCD of Flange = 200mm