Question about digital coax cable

Can a component video cable be used as a digital audio coax cable. ??
Yes. Most component video cables are around the same 75ohm rating that a digital coax cable is.

It sure won't hurt anything to try it. Maybe not the best, but it will surely work.
I agree with Mofimadness. You should have no problems at all. Also, since the requirements for both applications are pretty much the same, many companies rate them dual purpose.