Mechanical Engineering

It definitely looks like 2 threads from that top drawing.

That would advance the "nut" faster and still give you more "grip"/strength than a single acme thread.

Thank you very much.

I would also agree with Jo Jo:

"It definitely looks like 2 threads from that top drawing."

Also, in the frontview the thread starts on the opposite side at pretty much the same depth -> which wouldn't work out with only one thread.

Double start thread.

Bad drawing practice, this should be in a call out.

Thank you, the drawing is indeed not a good one.