If all went well, you should now be looking at the threads. If you do a shaded preview or render, it will take a while to come up as Rhino has to build the mesh. You just made your first true American Standard Thread in Rhino. Now if you like you can go on to make it into a bolt. We are done with all of the curves we used to make everything, So you can delete them or move them to a diffefent layer.
Lets make that bolt.
Now type 6, Press Enter. Press Enter Click anywhere in the top view. Here is what you just made. To do this we will use a sphere and the boolean. But first we must hide the main cylinder to make it easier to work.