I have threaded the surface of two separate parts using the thread tool. I am currently trying to use the screw mate to screw together the two parts, but solidworks will not allow it. Is it possible to screw together two threaded surfaces or is the screw mate only for a bolt and screw?

EDITED: Moderator moved to Assemblies space. Please use the appropriate space relating to the subject of your post, using general only if there is no other appropriate space.