Tubing size for 1/4" MPT threads

[tjash]

Quick question - what size tubing will fit over 1/4" MPT threads?

(I tried searching, but couldn't find a readily available answer)

 

[Fordzilla]

You do not want to connect tubing to threads. You need either a swivel nut or hose barb to attach to those threads. The size of the barb will determine the size of tubing you can use.

Also, what is this for?

 

[tjash]

Ideally, yes - I'd want a barbed fitting. But the place I'm ordering from doesn't have a 1/4" mfl to 3/8" barb adapter, and I'd rather not pay double shipping. They do have a 1/4" mfl to 1/4" mpt, so I was curious what size tubing would fit over 1/4" mpt threads.

This is just for a draft line recirc build, so I'm not worried about a slight leak or gunk in the threads. I figure if 3/8" tube will fit over those threads, I'll throw a clamp on it and call it good.

 

[Fordzilla]

You can get a brass hose barb at Home Depot for a couple dollars. I would go with that, personally.

 

[zachattack]

Well according to wikipedia (http://en.wikipedia.org/wiki/National_pipe_thread), the outer diameter of a 1/4" pipe is 0.54 inches. You could probably get some 1/2" ID tubing stretched over that fairly easily, especially if it's vinyl tubing and you heat it up.

 

[dumsboa09]

quick question - what size tubing will fit over 1/4" mpt threads?

(i tried searching, but couldn't find a readily available answer)

1/4" fpt

 

[tjash]

1/4" fpt

Thanks for clearing that up for me.