Connecting different sized hex meshes?

Hi community, 

I am quite new to Hypermesh so I would like to ask you to help me.

As you can see in the first picture, I'm meshing a screw and am struggeling with the thread, which wraps around the screw like a helix.

I split the thread into two different solids (the helix & the inner body) and hex-meshed them both individually. Since there is a "gap" between the elements and the nodes of the two meshes don't match, I would like to create a contact between the two.

How could it be done or is there even a better option?

Thanks and greetings!