What's Pitch Circle Diameter?

What does PCD mean? The Pitch Circle Diameter (PCD) is the diameter of the circle which passes through the centre of all the studs, wheel bolts or wheel rim holes.

What is pitch circle diameter used for?

Pitch Circle Diameter (PCD) – Gear Terminology

The pitch circle diameters are important numbers in locating the shafts of two mating gears. The center distance of two meshing gears is expressed as the sum of the pitch circle radii of the two gears.

How do you measure pitch circle diameter?

How do you work out Pitch Circle Diameter? Measure the distance between two adjacent studs. Measure from the centre of the stud and mark down your measurement. This applies whether you have four, five, or six studs to measure between.

Sophia Al-Mansoor

Sophia Al-Mansoor

Global Business & E-Commerce Reporter

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.