They're about 4.95mm new.
They will work OK down to about 4.82~4.84 when catastrophic failure of the rod becomes a possibility.

That's my findings on actual use.
I would not put money towards a new rod on a repinch if the crank isn't 4.90 at least.

These numbers are from my personal experience with engines, other people will tell you other numbers but usually those people want to sell more cranks and rods.