Hi, Frank. What are you cutting the hole in? How thick? How many is "mass produce"? If you are talking 50-100, a plunge router with a circle cutter base is the way to go. More than that, and I would look at water jet cutting or laser cutting. I am sort of assuming that you are cutting wood, but you can stack parts so you cut multiple pieces. We can give you a better guess with more info.
The biggest hole saw that Morse and Starrett make are 6". You can fly cut but every time I have tried that, the holes are pretty ragged. How close a tolerance do you need and is that a 7.500" OD or ID? Give us more info.