Fastener Thread Pitch Circle Diameter Equation and Calculator

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Fastener Thread Pitch Circle Diameter Equation and Calculator

This equation and calculator will determine the thread pitch circle diameter from the Major diameter and the pitch per ISO 898-1:1999 standard.

Thread Pitch Circle Diameter

Where:

dp = Pitch circle diameter of thread
D = Major Diameter
p = 1 / Number of threads per inch (n)

Open Fastener / Thread Pitch Circle Diameter Formula and Calculation