MIP thread for tub not tapered?

Hi Guys,

I'm remodeling my bathroom and thought I had bought the right threaded brass bushing for my spout and shower, but they don't appear to taper in like I was expecting, and, as picture 2 shows, when hand threaded lock tight after about two-three spins. So before I went any further with them I thought I'd ask everyones opinion if I'm just being psycho over-cautious or if these are just not the right bushings.

thanks in advance)

adapter

I am not sure what you mean about picture #2 showing something locking after 2 or 3 turns, but that is what usually happens with a tapered thread. Why do you need something like this for the shower, and it should be unnecessary for the spout if you did your installation properly.

thanks, I figured it was normal and I was just being overcautious, so its good to know).
its a grohe freehander showerhead, thats why it needs one for the showerhead. That fat brass thing is actually all the screws into the shower pipe, freehander goes over that.
Tub spout also screws in.
Had gotten the idea to use these from another thread,
https://terrylove.com/forums/showthread.php?t=11976
but couldn't find the same brand up here, just these MasterPlumber ones.

connections

We plumbers usually use a threaded elbow in the wall and then the proper sized brass nipple to connect the spout and/or hand held unit.

And sometimes 2 nipples and a coupling to add up to one of those in between sizes.