Fitting size vs tubing size?

[Smoblikat]

Hello, I am (hopefully) about to order some fittings and tubing for my new loop. This is my first time, and I am fairly confused on fitting and tubing sizes. I want to buy 3/8 X 1/2 tubing, what size fitting is appropriate for this? I figured I would need to match the ID of the tubing to the OD of the fitting. But the only fittings I can fine with a 3/8 OD have a 1.4 ID. Will this affect the performance of my loop, or is that the normal sizes people go with?

 

[Smoblikat]

Anyone? Im sure this is a realllly simple question. How do I figure out the size fitting needed for a specific size tubing?

 

[dougp]

All fittings will be G1/4 going into the waterblock/radiator/pump. ID of tubing really doesn't matter, what matters is your type of fittings. If you're going for barb fittings, then you only care about matching barb size to ID size. If you're looking at compression fittings, then you need to match ID and OD of the tubing to that side of the compression fitting.

 

[Smoblikat]

All fittings will be G1/4 going into the waterblock/radiator/pump. ID of tubing really doesn't matter, what matters is your type of fittings. If you're going for barb fittings, then you only care about matching barb size to ID size. If you're looking at compression fittings, then you need to match ID and OD of the tubing to that side of the compression fitting.

OK, makes sense. So for compression fittings, 3/8 X 1/2 fittings need to be paired with 3/8 X 1/2 tubing.

Thanks!

 

[dougp]

OK, makes sense. So for compression fittings, 3/8 X 1/2 fittings need to be paired with 3/8 X 1/2 tubing.

Thanks!

Yup. If you're going with 3/8 x 1/2, make sure you get some of the anti-kink coil, those thin sidewalls can collapse on sharp turns.

 

[aigomorla]

As someone already stated... most fittings are G1/4, which means it has a 1/4 inch diameter.

You match outer fitting diameter with inner tubing... so your last comment will work.

OK, makes sense. So for compression fittings, 3/8 X 1/2 fittings need to be paired with 3/8 X 1/2 tubing.

Thanks!

yes... make sure u get the correct inner and outer diameter on compression fittings, or you will have a problem compressing the outer lip.