ThreadCalc is a digital version of Filetor (thread indicator).
ThreadCalc calculates the d,d2,d3,D,D2,D3,H1,h3 and the drill size for the chosen threads.
Results for these measurements are given in MILLIMETERS.
Just choose the diameter and the pitch of the desired thread and TreadCalc does the rest.
ThreadCalc will also give the user a G-Code example (Okuma G71 and Fanuc G76) for the chosen thread.