Brass Adapter, #1

I want to use brass pipe with interior threads, All I could find was lamp parts and lamps have their own peculiar scaling system. I settled on 1/8IP pipes; that means the pipe is 3/8" wide and the threads inside are 27 to the inch. There are no screws either standard or metric that have that thread. Finding fasteners is just as much a challenge. Paxton had the parts and an array of different ones. I am using the pipes "off label" so to speak, creating a display stand - actually several of them and putting together the necessary parts is a challenge for someone like me who not only is unfamiliar with the products but not very handy either. These will meet my design and it will work out.