Tips vary, and I've seen all of the following at some point or another: 1/4" male thread, 3/8" male thread, 5/8" male thread, 5/8" stud, 5/8" male stud w/ 1/4" male thread, 5/8" male stud with 3/8" thread.
Until we know what the top of your stand looks like, it's all guesswork. If you can tell or show us what the top of your stand looks like, it should be easy to recommend the appropriate adapter(s).