the DIN 74234 is the one you will need.
It describes the dimensions and tolerances of the inverted flare (Bördel E) and the convex flare (Bördel F)
for the tubing of outer diameter:
4,75 mm / 6,00 mm / 8,00 mm / 10,00 mm.
The most usual dimension is 4,75 mm.
Unfortunately the standard is...