DIN 933 does not have fine pitches

[tobiasfalk]

In DIN 933 you mention a course and multiple fine pitches, the norm does not have multiple pitches there only the "course" pitch is defined as pitch.
There is DIN 961 and ISO8676(fine pitch version of ISO 4017) with fine pitches, but those are separate norms.
Base of this is the issue on shaise/FreeCAD_FastenersWB #272