Thread Pitch and Lead
Thread pitch, lead, and 60-degree sharp-V height for UN/UNC/UNF inch (pitch = 1 / TPI) and ISO metric (pitch in mm) threads: lead = pitch x starts, H = pitch x sqrt(3)/2 (first-principles 60-degree thread geometry).
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Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.