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Calculate Pitch Diameter

About Pitch Diameter Calculator

This calculator determines pitch diameter for threads, gears, and mechanical components, which is the effective diameter where threads or teeth make contact.

Pitch Diameter Formulas:

  • Threaded Fastener: PD = MD - (0.6495 × P)
  • Gear: PD = Module × Number of Teeth
  • Pulley: PD = Outer Diameter - Belt Thickness
  • Sprocket: PD = Pitch × Number of Teeth ÷ π

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