Need same thread as Nut on a new part.

Hi all,

I Have a very pressing question which needs to be answered.

I have a nut from the toolbox, but need a matcing thread type that would work on the screw/bolt. Can i some how put the shaft there and model the thread type over it quickly? Or can i find from the toolbox a nut and screw and be 100% sure that the threads match.

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