What Is Pitch Circle Diameter?

Answer

Pitch circle diameter (PCD) is the diameter of a circular component that is to be manufactured, which usually has holes drilled into it. For example, the circle which is drawn through the centre of the bolt holes of a wheel. PCD is measured in millimetres, and often indicates the number of bolts the wheel will have.
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Better known as Bolt Circle Diameter, the formula is d / sin (1/n x 180) where d is the distance between the centers of two adjacent bolts and n is the total number ...
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