Thread sizes

TheCenturion · 16 Aug 2010 at 01:23

Hi guys,

I think I'm getting to the point where I know enough about watercooling to be confident enough to do it myself. Something has been bugging me. The rad that I want to use is the 140.3 Thermochill. But this thing has a G3/8" thread. Yet there are no G3/8" barbs/compression on OcUK. Will there be any added anytime soon?
Also, the rest of my system will be G1/4" parts. I haven't missed some crucial information where all the parts have to be the same thread size have I?

I know that these are pretty basic questions, but as this would be a first time system, I want to minimise the opportunity for error

thank you

TheCenturion · 16 Aug 2010 at 10:30

JeffyB said:
If you want to use compressions you'll just need a couple of g3/8 to g1/4 convertors for the rad, search for "Reducing Socket from G3/8" thread to G1/4" with O Ring"

If you use barbs you can simply get g3/8 barbs
I have just noticed that thermochill make some g3/8 compressions themselves but only for 1/2id 3/4od hose.
http://www.thermo-chill.com/product...roduct/g38-to-12-id-34-od-compression-fitting

Thanks. I reckon I am going to use 1/2id 3/4od tubing anyway so that's lucky! I reckon I'll go with the thermochill compressions in the end. That's really helpful thanks Jeff

Bubo said:
No, the water doesn't care what thread size it has to go through at any point in a loop. You could have a bucket sized fitting and a needle sized fitting on one block and water would find its way through. Although this extreme example would actually result in a noticeable detrimental pressure drop, when talking about G1/4 and G3/8 the pressure drop difference is negligable (though infact the pressure drop across the G3/8 fitting *may* actually be lower than the G1/4, it depends on the bore size and geometry)

Yeah, I was thinking that it would change the pressure. hopefully not too much though. Thank you

TheCenturion · 16 Aug 2010 at 11:34

those thermochill g3/8" compressions actually look quite nice. when the time comes, I'll settle on them

TheCenturion · 16 Aug 2010 at 11:39

JeffyB said:
They also do g1/4 for the rest of the loop if you like them

Yes indeed

But... at 85p those feser ones are poking out at me for the G1/4". It's just too good a deal

TheCenturion · 16 Aug 2010 at 11:44

Oh carp. Just realised they're for 3/8" ID. I guess I'll probably go with the thermochill G1/4" as well, but the bitspower, while expensive, look really nice. And, if I'm already shelling out for a system, a few extra bob on nice fittings is nothing