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1/4" Thread Bottleneck??? Yes or No

post #1 of 6
Thread Starter 
does every fitting/barb have 1/4" thread? wouldn't this cause a bottleneck if i have 1/2" ID 5/8 OD Tubing?

I'm new to WC and this is confusing me a little.....
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post #2 of 6
no but most do. my rad has 3/8' threads
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post #3 of 6
The threaded size is a pipe fitting size, its a lot bigger then 1/4" tubing...Most G1/4x1/2" are 3/8" to 7/16" internal flow size....
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post #4 of 6
Quote:
Originally Posted by ira-k View Post
The threaded size is a pipe fitting size, its a lot bigger then 1/4" tubing...Most G1/4x1/2" are 3/8" to 7/16" internal flow size....
Yup ... here's some examples -

EK High-Flow Fitting (G 1/4" Thread, 1/2" OD) ------------------------- 10.0mm ID = 0.39399999999999996 inches
EK High-Flow Fitting (G 3/8" Thread, 1/2" OD) -------------------- 10.1mm ID = 0.39793999999999996 inches
D-Tek High-Flow Fitting (G 1/4" Thread, 1/2" OD) ------------- 10.0mm ID = 0.39399999999999996 inches
Danger Den High-Flow Fitting (G 1/4" Thread, 1/2" OD) ------- 10.0mm ID = 0.39399999999999996 inches
Swiftech High-Flow Fitting (G 1/4" Thread, 1/2" OD) ---------- 10.16mm ID = 0.40 inches
AquaXtreme High-Flow Fitting (9/16" UNF Thread, 1/2" OD) -- 10.5mm ID = 0.41369999999999995
Danger Den Fat Boy (G 1/4" Thread, 1/2" OD) ----------------- 10.1mm ID = 0.39793999999999996 inches
post #5 of 6
Lol, so bascially 0.4 inches. Not much restriction at all.
    
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post #6 of 6
Yeah, but not all is at is seems. Pump tops in particular have shown to do better with a smaller inlet. Many nozzled blocks like the Fuzion with nozzle do well with 5.5mm nozzle, so the 10mm barb is relatively insignificant on those.

While I like the larger 3/8" NPT and 3/8" BSPP threading, G1/4 has become the standard...it is what it is...

But also a good reason for 7/16" ID tubing, it matches the barb ID's a little better. Also the G1/4 fatboy barbs from DD taper with 11.0mm at the tubing side down to 10.00mm.

Long live the G1/4 fatboy barbs!...
    
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