With regards to the American National Screw Thread nomenclature, 'pitch' is the __________.

Correct Answer: Option D — distance between corresponding points on adjacent threads

In American National Screw Thread nomenclature, the pitch is defined as the axial distance between corresponding points on adjacent threads. This is measured from crest to crest or root to root, and it is the reciprocal of the number of threads per inch for a given fastener.