TURNMATE / Three-wire measurement
Thread three-wire measurement calculator
Calculate the theoretical measurement over wires from pitch diameter, pitch, wire size, and thread angle. Calculations run locally in your browser. Keep units consistent; results are for geometry or unit checks.
Formula and scope
Three-wire equation: M = d₂ + w(1 + 1/sin(α/2)) − P/(2tan(α/2)). This is a geometric calculation, not a substitute for thread gauges or tolerance inspection.
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