I want to use a TMC body (single-flute, standard type holder) for machining pipe screws, but the combination is not displayed in the program creation app "Thread Pro". Why are the bodies and inserts the right size?
 

This is because some size interfere with the shape of the holder.

Originally, a type with a neck is used, such as TMNC (for single-flute, tapered screws for pipes), which is a pipe thread body.

Difference Between Standard Type Body and Tube Tapered Thread Body

* In the processing of some pipe thread sizes, TMC bodies (single flutes, standard type bodies) may be processed.

You can check whether a TMC body (single-flute, standard type body) can be used by entering the size of the pipe screw you want to process in the thread mill program creation app "Thread Pro".

　Thread Mill Program Creation App "Thread Pro"