Pomona 72930 Hex Nut Size
The thread size for the Pomona 72930's hex nut is not a matter of record. But by taking one and physically measuring it, the thread pitch can be determined.
It has a known thickness of 4mm, and 5 threads reach their crest in that space. This comes out to a thread pitch of 0.8mm.
The inside diameter measures out to be approximately 11.15 mm.