Roy Lewallen wrote in
treetonline:

... There are no RG numbers associated with it that I know
of -- it's simply specified by impedance and outside diameter - 0.085,
0.141, 0.250 inches and smaller are common. ...

UT-141 is often also labelled RG-402, and UT-085 is often also labelled RG-
405. Some manufacturers seem to think that there is some level of
equivalence.

I added RG-402 and RG-405 to my line loss calculator to cover the
apparently equivalent Uniform Tubes types (ie UT-nnn).

Owen