# How to Calculate Pitch Circle Diameter (PCD) For 8 Number of Holes?

Short tutorial on How to Calculate Pitch Circle Diameter (PCD) For 8 Number of Holes?

## PCD For 8 Number of Holes

Pitch Circle Diameter (PCD) is defined as the diameter of a circle that passes through every bolt holes. The PCD diameter is usually measured in terms of millimeters. The Pitch Circle Diameter is usually used to measure the distance
between the two opposite holes.

This short tutorial will explain you on how to calculate the **Pitch Circle Diameter (PCD)** for 8 number of holes.

**Formula:**

PCD for 8 number of holes = S / 0.38268

Where,

S = Measurement of Flange in Millimeters

**Example:**

Consider a 100mm flange, with 8 holes. Find the PCD of the flange.

**Given:**

Measurement of Flange S = 100mm

Number of Holes = 8

**To Find:**

Pitch Circle Diameter (PCD)

**Solution:**

Apply the values in the formula,

PCD for 8 number of holes = S / 0.38268

PCD for 8 number of holes = 100 / 0.38268

PCD for 8 number of holes = 261.31mm

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