Quote Originally Posted by jerry clayton View Post
Use allen bolts screwed in from back side
+1 This is how I've always seen screw in wheel studs done.

Fully threaded bolt availability is a little limited, though. McMaster Carr lists an allen head fully threaded bolt that is 1 3/4" long. I haven't found anything longer than that. If you need something longer, you may need to think about drilling the axle for a press in stud as already suggested.