Large Diameter(d)-the nominal diameter of thread.
Small Diameter(d1)-Ofen used for strength calculations.
Medium Diameter(d2)-Ofen used for geometric calculations.
Pitch(P)-the axial distance between the corresponding points on two adjacent threads on the middle diameter line.
Thread Count(P)-the numbers of helices of thread.
Helical Pitch(S)-the axial distance that is moved the same helix on a thread once, S=nP.
Helix Angle(Ψ)-the angle between the tangent of a helix and the plane perpendicular to the axis of the thread, Tan Ψ = S/πd2= nP/πd2.
By knowing the basic parameters of thread, you may have a clearer idea of how to choose or design titanium screws, titanium bolts, titanium nuts according to your requirements.
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